Back-up Rings

Back-up rings (aka anti-extrusion rings) protect o’rings and help prevent extrusion in high pressure applications.

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Back-up rings

Back-up rings (aka anti-extrusion rings) protect o’rings and help prevent extrusion in high pressure applications by closing the clearance gap and reducing friction by trapping lubricant in the area of the seal. Double acting applications (using bi-directional pressure) require the use of two back-up rings, one on either side of the o’ring.
In single acting applications (single sided pressure) where only one back-up ring is required, the back-up is located on the low pressure side of the o’ring; although it is often recommended that two back-ups be used in single acting applications to mitigate the possibility of installing the back-up on the wrong side of the o’ring.

Sealing Australia stocks a wide range of back-up rings to suit imperial and JIS metric sized o’rings. Compounds available: 90 Duro nitrile, 90 Duro Viton, Teflon and polyurethane.

Imperial Contoured Back-up Sizes

Contoured back-ups are usually made of rubber and mimic the shape of an o’ring on one side to minimises distortion of the o’ring while under pressure.

Available in NBR90 and FKM90 (Viton)

1/16″ Contoured Back-up

Size referenceID (inch)±W (inch)±ID (mm)±W (mm)±
004.096.005.053.0032.440.131.350.08
005.127.005.053.0033.230.131.350.08
006.140.005.053.0033.560.131.350.08
007.171.005.053.0034.340.131.350.08
008.202.005.053.0035.130.131.350.08
009.234.005.053.0035.940.131.350.08
010.265.005.053.0036.730.131.350.08
011.327.005.053.0038.310.131.350.08
012.390.005.053.0039.910.131.350.08
013.455.005.053.00311.560.131.350.08
014.518.005.053.00313.160.131.350.08
015.580.007.053.00314.730.181.350.08
016.643.009.053.00316.330.231.350.08
017.705.009.053.00317.910.231.350.08
018.768.009.053.00319.510.231.350.08
019.830.009.053.00321.080.231.350.08
020.893.009.053.00322.680.231.350.08
021.955.009.053.00324.260.231.350.08
0221.018.010.053.00325.860.251.350.08
0231.080.010.053.00327.430.251.350.08
0241.143.010.053.00329.030.251.350.08
0251.205.011.053.00330.610.281.350.08
0261.268.011.053.00332.210.281.350.08
0271.330.011.053.00333.780.281.350.08
0281.393.013.053.00335.380.331.350.08
0291.518.013.053.00338.560.331.350.08
0301.643.013.053.00341.730.331.350.08
0311.768.015.053.00344.910.381.350.08
0321.893.015.053.00348.080.381.350.08
0332.018.018.053.00351.260.461.350.08
0342.143.018.053.00354.430.461.350.08
0352.268.018.053.00357.610.461.350.08
0362.393.018.053.00360.780.461.350.08
0372.518.018.053.00363.960.461.350.08
0382.643.020.053.00367.130.511.350.08
0392.768.020.053.00370.310.511.350.08
0402.893.020.053.00373.480.511.350.08
0413.018.024.053.00376.660.611.350.08
0423.268.024.053.00383.010.611.350.08
0433.518.024.053.00389.360.611.350.08
0443.768.027.053.00395.710.691.350.08
0454.018.027.053.003102.060.691.350.08
0464.268.030.053.003108.410.761.350.08
0474.518.030.053.003114.760.761.350.08
0484.768.030.053.003121.110.761.350.08
0495.018.037.053.003127.460.941.350.08
0505.268.037.053.003133.810.941.350.08

3/32″ Contoured Back-up

Size referenceID (inch)±W (inch)±ID (mm)±W (mm)±
102.077.005.086.0031.960.132.180.08
103.109.005.086.0032.770.132.180.08
104.140.005.086.0033.560.132.180.08
105.171.005.086.0034.340.132.180.08
106.202.005.086.0035.130.132.180.08
107.234.005.086.0035.940.132.180.08
108.265.005.086.0036.730.132.180.08
109.327.005.086.0038.310.132.180.08
110.390.005.086.0039.910.132.180.08
111.452.005.086.00311.480.132.180.08
112.515.005.086.00313.080.132.180.08
113.577.007.086.00314.660.182.180.08
114.640.009.086.00316.260.232.180.08
115.702.009.086.00317.830.232.180.08
116.765.009.086.00319.430.232.180.08
117.831.010.086.00321.110.252.180.08
118.893.010.086.00322.680.252.180.08
119.956.010.086.00324.280.252.180.08
1201.018.010.086.00325.860.252.180.08
1211.081.010.086.00327.460.252.180.08
1221.143.010.086.00329.030.252.180.08
1231.206.012.086.00330.630.302.180.08
1241.268.012.086.00332.210.302.180.08
1251.331.012.086.00333.810.302.180.08
1261.393.012.086.00335.380.302.180.08
1271.456.012.086.00336.980.302.180.08
1281.518.012.086.00338.560.302.180.08
1291.581.015.086.00340.160.382.180.08
1301.643.015.086.00341.730.382.180.08
1311.706.015.086.00343.330.382.180.08
1321.768.015.086.00344.910.382.180.08
1331.831.015.086.00346.510.382.180.08
1341.893.015.086.00348.080.382.180.08
1351.956.017.086.00349.680.432.180.08
1362.018.017.086.00351.260.432.180.08
1372.081.017.086.00352.860.432.180.08
1382.143.017.086.00354.430.432.180.08
1392.206.017.086.00356.030.432.180.08
1402.268.017.086.00357.610.432.180.08
1412.331.020.086.00359.210.512.180.08
1422.393.020.086.00360.780.512.180.08
1432.456.020.086.00362.380.512.180.08
1442.518.020.086.00363.960.512.180.08
1452.581.020.086.00365.560.512.180.08
1462.643.020.086.00367.130.512.180.08
1472.706.022.086.00368.730.562.180.08
1482.768.022.086.00370.310.562.180.08
1492.831.022.086.00371.910.562.180.08
1502.893.022.086.00373.480.562.180.08
1513.018.024.086.00376.660.612.180.08
1523.268.024.086.00383.010.612.180.08
1533.518.024.086.00389.360.612.180.08
1543.768.028.086.00395.710.712.180.08
1554.018.028.086.003102.060.712.180.08
1564.268.030.086.003108.410.762.180.08
1574.518.030.086.003114.760.762.180.08
1584.768.030.086.003121.110.762.180.08
1595.018.035.086.003127.460.892.180.08
1605.268.035.086.003133.810.892.180.08
1615.518.035.086.003140.160.892.180.08
1625.768.035.086.003146.510.892.180.08
1636.018.035.086.003152.860.892.180.08
1646.268.040.086.003159.211.022.180.08
1656.518.040.086.003165.561.022.180.08
1666.768.040.086.003171.911.022.180.08
1677.018.040.086.003178.261.022.180.08
1687.268.045.086.003184.611.142.180.08
1697.518.045.086.003190.961.142.180.08
1707.768.045.086.003197.311.142.180.08
1718.018.045.086.003203.661.142.180.08
1728.268.050.086.003210.011.272.180.08
1738.518.050.086.003216.361.272.180.08
1748.768.050.086.003222.711.272.180.08
1759.018.050.086.003229.061.272.180.08
1769.268.055.086.003235.411.402.180.08
1779.518.055.086.003241.761.402.180.08
1789.768.055.086.003248.111.402.180.08

1/8″ Contoured Back-up

Size referenceID (inch)±W (inch)±ID (mm)±W (mm)±
201.202.005.118.0045.130.133.000.10
202.265.005.118.0046.730.133.000.10
203.327.005.118.0048.310.133.000.10
204.390.005.118.0049.910.133.000.10
205.455.005.118.00411.560.133.000.10
206.518.005.118.00413.160.133.000.10
207.580.007.118.00414.730.183.000.10
208.643.009.118.00416.330.233.000.10
209.705.010.118.00417.910.233.000.10
210.766.010.118.00419.460.253.000.10
211.828.010.118.00421.030.253.000.10
212.891.010.118.00422.630.253.000.10
213.953.010.118.00424.210.253.000.10
2141.016.010.118.00425.810.253.000.10
2151.078.010.118.00427.380.253.000.10
2161.141.012.118.00428.980.303.000.10
2171.203.012.118.00430.560.303.000.10
2181.266.012.118.00432.160.303.000.10
2191.334.012.118.00433.880.303.000.10
2201.397.012.118.00435.480.303.000.10
2211.459.012.118.00437.060.303.000.10
2221.522.015.118.00438.660.383.000.10
2231.647.015.118.00441.830.383.000.10
2241.772.015.118.00445.010.383.000.10
2251.897.018.118.00448.180.463.000.10
2262.022.018.118.00451.360.463.000.10
2272.147.018.118.00454.530.463.000.10
2282.272.020.118.00457.710.513.000.10
2292.397.020.118.00460.890.513.000.10
2302.522.020.118.00464.060.513.000.10
2312.631.020.118.00466.830.513.000.10
2322.756.024.118.00470.000.613.000.10
2332.881.024.118.00473.180.613.000.10
2343.006.024.118.00476.350.613.000.10
2353.131.024.118.00479.530.613.000.10
2363.256.024.118.00482.700.613.000.10
2373.381.024.118.00485.880.613.000.10
2383.506.024.118.00489.050.613.000.10
2393.631.028.118.00492.230.713.000.10
2403.756.028.118.00495.400.713.000.10
2413.881.028.118.00498.580.713.000.10
2424.006.028.118.004101.750.713.000.10
2434.131.028.118.004104.930.713.000.10
2444.256.030.118.004108.100.763.000.10
2454.381.030.118.004111.280.763.000.10
2464.506.030.118.004114.450.763.000.10
2474.631.030.118.004117.630.763.000.10
2484.768.030.118.004121.110.763.000.10
2494.893.035.118.004124.280.893.000.10
2505.018.035.118.004127.460.893.000.10
2515.143.035.118.004130.630.893.000.10
2525.268.035.118.004133.810.893.000.10
2535.393.035.118.004136.980.893.000.10
2545.518.035.118.004140.160.893.000.10
2555.643.035.118.004143.330.893.000.10
2565.768.035.118.004146.510.893.000.10
2575.893.035.118.004149.680.893.000.10
2586.018.035.118.004152.860.893.000.10
2596.268.040.118.004159.211.023.000.10
2606.518.040.118.004165.561.023.000.10
2616.768.040.118.004171.911.023.000.10
2627.018.040.118.004178.261.023.000.10
2637.268.045.118.004184.611.143.000.10
2647.518.045.118.004190.961.143.000.10
2657.768.045.118.004197.311.143.000.10
2668.018.045.118.004203.661.143.000.10
2678.268.050.118.004210.011.273.000.10
2688.518.050.118.004216.361.273.000.10
2698.768.050.118.004222.711.273.000.10
2709.018.050.118.004229.061.273.000.10
2719.268.055.118.004235.411.403.000.10
2729.518.055.118.004241.761.403.000.10
2739.768.055.118.004248.111.403.000.10
27410.018.055.118.004254.461.403.000.10
27510.518.055.118.004267.161.403.000.10
27611.018.065.118.004279.861.653.000.10
27711.518.065.118.004292.561.653.000.10
27812.018.065.118.004305.261.653.000.10
27913.018.065.118.004330.661.653.000.10
28014.018.065.118.004356.061.653.000.10
28115.018.065.118.004381.461.653.000.10
28215.989.075.118.004406.121.913.000.10
28316.989.080.118.004431.522.033.000.10
28417.989.085.118.004456.922.163.000.10

3/16″ Contoured Back-up

Size referenceID (inch)±W (inch)±ID (mm)±W (mm)±
309.450.005.183.00511.430.134.650.13
310.513.005.183.00513.030.134.650.13
311.575.007.183.00514.610.184.650.13
312.638.009.183.00516.210.234.650.13
313.700.009.183.00517.780.234.650.13
314.763.010.183.00519.380.254.650.13
315.825.010.183.00520.960.254.650.13
316.888.010.183.00522.560.254.650.13
317.950.010.183.00524.130.254.650.13
3181.013.010.183.00525.730.254.650.13
3191.075.010.183.00527.310.254.650.13
3201.138.012.183.00528.910.304.650.13
3211.200.012.183.00530.480.304.650.13
3221.263.012.183.00532.080.304.650.13
3231.316.012.183.00533.430.304.650.13
3241.388.012.183.00535.260.304.650.13
3251.513.015.183.00538.430.384.650.13
3261.638.015.183.00541.610.384.650.13
3271.763.015.183.00544.780.384.650.13
3281.888.015.183.00547.960.384.650.13
3292.013.018.183.00551.130.464.650.13
3302.138.018.183.00554.310.464.650.13
3312.268.018.183.00557.610.464.650.13
3322.393.018.183.00560.780.464.650.13
3332.518.020.183.00563.960.514.650.13
3342.643.020.183.00567.130.514.650.13
3352.768.020.183.00570.310.514.650.13
3362.893.020.183.00573.480.514.650.13
3373.018.024.183.00576.660.614.650.13
3383.143.024.183.00579.830.614.650.13
3393.273.024.183.00583.130.614.650.13
3403.398.024.183.00586.310.614.650.13
3413.523.024.183.00589.480.614.650.13
3423.648.028.183.00592.660.714.650.13
3433.773.028.183.00595.830.714.650.13
3443.898.028.183.00599.010.714.650.13
3454.028.028.183.005102.310.714.650.13
3464.153.028.183.005105.490.714.650.13
3474.278.030.183.005108.660.764.650.13
3484.403.030.183.005111.840.764.650.13
3494.528.030.183.005115.010.764.650.13
3504.653.030.183.005118.190.764.650.13
3514.778.030.183.005121.360.764.650.13
3524.903.030.183.005124.540.764.650.13
3535.028.037.183.005127.710.944.650.13
3545.153.037.183.005130.890.944.650.13
3555.278.037.183.005134.060.944.650.13
3565.403.037.183.005137.240.944.650.13
3575.528.037.183.005140.410.944.650.13
3585.653.037.183.005143.590.944.650.13
3595.778.037.183.005146.760.944.650.13
3605.903.037.183.005149.940.944.650.13
3616.028.037.183.005153.110.944.650.13
3626.278.040.183.005159.461.024.650.13
3636.528.040.183.005165.811.024.650.13
3646.778.040.183.005172.161.024.650.13
3657.028.040.183.005178.511.024.650.13
3667.278.045.183.005184.861.144.650.13
3677.528.045.183.005191.211.144.650.13
3687.778.045.183.005197.561.144.650.13
3698.028.045.183.005203.911.144.650.13
3708.278.050.183.005210.261.274.650.13
3718.528.050.183.005216.611.274.650.13
3728.778.050.183.005222.961.274.650.13
3739.028.050.183.005229.311.274.650.13
3749.278.055.183.005235.661.404.650.13
3759.528.055.183.005242.011.404.650.13
3769.778.055.183.005248.361.404.650.13
37710.028.055.183.005254.711.404.650.13
37810.528.060.183.005267.411.524.650.13
37911.028.060.183.005280.111.524.650.13
38011.528.065.183.005292.811.654.650.13
38112.028.065.183.005305.511.654.650.13
38213.028.065.183.005330.911.654.650.13
38314.028.070.183.005356.311.784.650.13
38415.028.070.183.005381.711.784.650.13
38516.008.075.183.005406.601.914.650.13
38617.008.080.183.005432.012.034.650.13
38718.008.085.183.005457.402.164.650.13
38819.006.090.183.005482.752.294.650.13
38920.006.095.183.005508.152.414.650.13
39021.006.095.183.005533.552.414.650.13
39122.006.100.183.005558.952.544.650.13
39222.993.105.183.005584.022.674.650.13
39323.993.110.183.005609.422.794.650.13
39424.993.115.183.005634.822.924.650.13
39525.993.120.183.005660.223.054.650.13

3/16″ Contoured Back-up

Size referenceID (inch)±W (inch)±ID (mm)±W (mm)±
309.450.005.183.00511.430.134.650.13
310.513.005.183.00513.030.134.650.13
311.575.007.183.00514.610.184.650.13
312.638.009.183.00516.210.234.650.13
313.700.009.183.00517.780.234.650.13
314.763.010.183.00519.380.254.650.13
315.825.010.183.00520.960.254.650.13
316.888.010.183.00522.560.254.650.13
317.950.010.183.00524.130.254.650.13
3181.013.010.183.00525.730.254.650.13
3191.075.010.183.00527.310.254.650.13
3201.138.012.183.00528.910.304.650.13
3211.200.012.183.00530.480.304.650.13
3221.263.012.183.00532.080.304.650.13
3231.316.012.183.00533.430.304.650.13
3241.388.012.183.00535.260.304.650.13
3251.513.015.183.00538.430.384.650.13
3261.638.015.183.00541.610.384.650.13
3271.763.015.183.00544.780.384.650.13
3281.888.015.183.00547.960.384.650.13
3292.013.018.183.00551.130.464.650.13
3302.138.018.183.00554.310.464.650.13
3312.268.018.183.00557.610.464.650.13
3322.393.018.183.00560.780.464.650.13
3332.518.020.183.00563.960.514.650.13
3342.643.020.183.00567.130.514.650.13
3352.768.020.183.00570.310.514.650.13
3362.893.020.183.00573.480.514.650.13
3373.018.024.183.00576.660.614.650.13
3383.143.024.183.00579.830.614.650.13
3393.273.024.183.00583.130.614.650.13
3403.398.024.183.00586.310.614.650.13
3413.523.024.183.00589.480.614.650.13
3423.648.028.183.00592.660.714.650.13
3433.773.028.183.00595.830.714.650.13
3443.898.028.183.00599.010.714.650.13
3454.028.028.183.005102.310.714.650.13
3464.153.028.183.005105.490.714.650.13
3474.278.030.183.005108.660.764.650.13
3484.403.030.183.005111.840.764.650.13
3494.528.030.183.005115.010.764.650.13
3504.653.030.183.005118.190.764.650.13
3514.778.030.183.005121.360.764.650.13
3524.903.030.183.005124.540.764.650.13
3535.028.037.183.005127.710.944.650.13
3545.153.037.183.005130.890.944.650.13
3555.278.037.183.005134.060.944.650.13
3565.403.037.183.005137.240.944.650.13
3575.528.037.183.005140.410.944.650.13
3585.653.037.183.005143.590.944.650.13
3595.778.037.183.005146.760.944.650.13
3605.903.037.183.005149.940.944.650.13
3616.028.037.183.005153.110.944.650.13
3626.278.040.183.005159.461.024.650.13
3636.528.040.183.005165.811.024.650.13
3646.778.040.183.005172.161.024.650.13
3657.028.040.183.005178.511.024.650.13
3667.278.045.183.005184.861.144.650.13
3677.528.045.183.005191.211.144.650.13
3687.778.045.183.005197.561.144.650.13
3698.028.045.183.005203.911.144.650.13
3708.278.050.183.005210.261.274.650.13
3718.528.050.183.005216.611.274.650.13
3728.778.050.183.005222.961.274.650.13
3739.028.050.183.005229.311.274.650.13
3749.278.055.183.005235.661.404.650.13
3759.528.055.183.005242.011.404.650.13
3769.778.055.183.005248.361.404.650.13
37710.028.055.183.005254.711.404.650.13
37810.528.060.183.005267.411.524.650.13
37911.028.060.183.005280.111.524.650.13
38011.528.065.183.005292.811.654.650.13
38112.028.065.183.005305.511.654.650.13
38213.028.065.183.005330.911.654.650.13
38314.028.070.183.005356.311.784.650.13
38415.028.070.183.005381.711.784.650.13
38516.008.075.183.005406.601.914.650.13
38617.008.080.183.005432.012.034.650.13
38718.008.085.183.005457.402.164.650.13
38819.006.090.183.005482.752.294.650.13
38920.006.095.183.005508.152.414.650.13
39021.006.095.183.005533.552.414.650.13
39122.006.100.183.005558.952.544.650.13
39222.993.105.183.005584.022.674.650.13
39323.993.110.183.005609.422.794.650.13
39424.993.115.183.005634.822.924.650.13
39525.993.120.183.005660.223.054.650.13

Imperial Solid Back-up Sizes

Contoured back-ups are usually made of rubber and mimic the shape of an o’ring on one side to minimises distortion of the o’ring while under pressure.

Available in NBR90 and FKM90 (Viton)

1/16″ Solid Back-up

Includes MS27595
Ht= .050″ ±.002 (1.27mm ±0.05)
Size ReferenceID (inch)±W (inch)±ID (mm)±W (mm)±
004.080.001.055.0012.030.031.400.03
005.111.001.055.0012.820.031.400.03
006.125.001.055.0013.180.031.400.03
007.156.001.055.0013.960.031.400.03
008.187.001.055.0014.750.031.400.03
009.219.001.055.0015.560.031.400.03
010.250.001.055.0016.350.031.400.03
011.312.001.055.0017.920.031.400.03
012.375.001.055.0019.530.031.400.03
013.440.001.055.00111.180.031.400.03
014.503.001.055.00112.780.031.400.03
015.565.001.055.00114.350.031.400.03
016.628.001.055.00115.950.031.400.03
017.690.001.055.00117.530.031.400.03
018.753.001.055.00119.130.031.400.03
019.815.001.055.00120.700.031.400.03
020.881.001.055.00122.380.031.400.03
021.943.002.055.00123.950.051.400.03
0221.006.002.055.00125.550.051.400.03
0231.068.002.055.00127.130.051.400.03
0241.131.002.055.00128.730.051.400.03
0251.193.002.055.00130.300.051.400.03
0261.256.002.055.00131.900.051.400.03
0271.318.002.055.00133.480.051.400.03
0281.381.002.055.00135.080.051.400.03
0291.506.002.055.00138.250.051.400.03
0301.631.002.055.00141.430.051.400.03
0311.756.002.055.00144.600.051.400.03
0321.881.002.055.00147.780.051.400.03
0332.086.002.055.00152.980.051.400.03
0342.131.002.055.00154.130.051.400.03
0352.256.002.055.00157.300.051.400.03
0362.381.002.055.00160.480.051.400.03
0372.506.002.055.00163.650.051.400.03
0382.631.002.055.00166.830.051.400.03
0392.756.002.055.00170.000.051.400.03
0402.881.002.055.00173.180.051.400.03
0413.006.002.055.00176.350.051.400.03
0422.256.002.055.00157.300.051.400.03
0433.506.002.055.00189.050.051.400.03
0443.756.002.055.00195.400.051.400.03
0454.006.002.055.001101.750.051.400.03
0464.256.002.055.001108.100.051.400.03
0474.506.002.055.001114.450.051.400.03
0484.756.002.055.001120.800.051.400.03
0495.006.002.055.001127.150.051.400.03
0505.256.002.055.001133.500.051.400.03

3/32″ Solid Back-up

Includes MS27595
Ht= .050″ ±.002 (1.27mm ±0.05)
Size ReferenceID (inch)±W (inch)±ID (mm)±W (mm)±
102.061.001.088.0021.550.032.240.05
103.093.001.088.0022.360.032.240.05
104.124.001.088.0023.150.032.240.05
105.155.001.088.0023.940.032.240.05
106.186.001.088.0024.720.032.240.05
107.218.001.088.0025.540.032.240.05
108.249.001.088.0026.320.032.240.05
109.311.001.088.0027.900.032.240.05
110.374.001.088.0029.500.032.240.05
111.437.001.088.00211.100.032.240.05
112.499.001.088.00212.670.032.240.05
113.562.001.088.00214.270.032.240.05
114.624.001.088.00215.850.032.240.05
115.687.001.088.00217.450.032.240.05
116.749.001.088.00219.020.032.240.05
117.815.001.088.00220.700.032.240.05
118.877.001.088.00222.280.032.240.05
119.940.001.088.00223.880.032.240.05
1201.002.001.088.00225.450.032.240.05
1211.065.002.088.00227.050.052.240.05
1221.127.002.088.00228.630.052.240.05
1231.190.002.088.00230.230.052.240.05
1241.252.002.088.00231.800.052.240.05
1251.315.002.088.00233.400.052.240.05
1261.377.002.088.00234.980.052.240.05
1271.440.002.088.00236.580.052.240.05
1281.502.002.088.00238.150.052.240.05
1291.565.002.088.00239.750.052.240.05
1301.629.002.088.00241.380.052.240.05
1311.691.002.088.00242.950.052.240.05
1321.754.002.088.00244.550.052.240.05
1331.816.002.088.00246.130.052.240.05
1341.879.002.088.00247.730.052.240.05
1351.942.002.088.00249.330.052.240.05
1362.004.002.088.00250.900.052.240.05
1372.067.002.088.00252.500.052.240.05
1382.129.002.088.00254.080.052.240.05
1392.192.002.088.00255.680.052.240.05
1402.254.002.088.00257.250.052.240.05
1412.317.002.088.00258.850.052.240.05
1422.379.002.088.00260.430.052.240.05
1432.442.002.088.00262.030.052.240.05
1442.504.002.088.00263.600.052.240.05
1452.567.002.088.00265.200.052.240.05
1462.629.002.088.00266.780.052.240.05
1472.692.002.088.00268.380.052.240.05
1482.754.002.088.00269.950.052.240.05
1492.817.002.088.00271.550.052.240.05
1502.879.002.088.00273.130.052.240.05
1513.004.002.088.00276.300.052.240.05
1523.254.002.088.00282.650.052.240.05
1533.504.002.088.00289.000.052.240.05
1543.754.002.088.00295.350.052.240.05
1554.004.002.088.002101.700.052.240.05
1564.254.002.088.002108.050.052.240.05
1574.504.002.088.002114.400.052.240.05
1584.754.002.088.002120.750.052.240.05
1595.004.002.088.002127.100.052.240.05
1605.254.002.088.002133.450.052.240.05
1615.504.002.088.002139.800.052.240.05
1625.754.002.088.002146.150.052.240.05
1636.004.002.088.002152.500.052.240.05
1646.254.002.088.002158.850.052.240.05
1656.504.002.088.002165.200.052.240.05
1666.754.002.088.002171.550.052.240.05
1677.004.002.088.002177.900.052.240.05
1687.254.002.088.002184.250.052.240.05
1697.504.002.088.002190.600.052.240.05
1707.754.002.088.002196.950.052.240.05
1718.004.002.088.002203.300.052.240.05
1728.254.002.088.002209.650.052.240.05
1738.504.002.088.002216.000.052.240.05
1748.754.002.088.002222.350.052.240.05
1759.004.002.088.002228.700.052.240.05
1769.254.002.088.002235.050.052.240.05
1779.504.002.088.002241.400.052.240.05
1789.754.002.088.002247.750.052.240.05

1/8″ Solid Back-up

Includes MS27595
Ht= .050″ ±.002 (1.27mm ±0.05)
Size ReferenceID (inch)±W (inch)±ID (mm)±W (mm)±
201.191.001.119.0014.850.033.020.03
202.253.001.119.0016.430.033.020.03
203.316.001.119.0018.030.033.020.03
204.378.001.119.0019.600.033.020.03
205.441.001.119.00111.200.033.020.03
206.503.001.119.00112.780.033.020.03
207.566.001.119.00114.380.033.020.03
208.628.001.119.00115.950.033.020.03
209.691.001.119.00117.550.033.020.03
210.753.001.119.00119.130.033.020.03
211.815.001.119.00120.700.033.020.03
212.878.001.119.00122.300.033.020.03
213.940.001.119.00123.880.033.020.03
2141.003.002.119.00125.480.053.020.03
2151.065.002.119.00127.050.053.020.03
2161.128.002.119.00128.650.053.020.03
2171.190.002.119.00130.230.053.020.03
2181.253.002.119.00131.830.053.020.03
2191.315.002.119.00133.400.053.020.03
2201.378.002.119.00135.000.053.020.03
2211.440.002.119.00136.580.053.020.03
2221.503.002.119.00138.180.053.020.03
2231.629.002.119.00141.380.053.020.03
2241.754.002.119.00144.550.053.020.03
2251.880.002.119.00147.750.053.020.03
2262.005.002.119.00150.930.053.020.03
2272.130.002.119.00154.100.053.020.03
2282.255.002.119.00157.280.053.020.03
2292.380.002.119.00160.450.053.020.03
2302.505.002.119.00163.630.053.020.03
2312.630.002.119.00166.800.053.020.03
2322.755.002.119.00169.980.053.020.03
2332.880.002.119.00173.150.053.020.03
2343.005.002.119.00176.330.053.020.03
2353.130.002.119.00179.500.053.020.03
2363.255.002.119.00182.680.053.020.03
2373.380.002.119.00185.850.053.020.03
2383.505.002.119.00189.030.053.020.03
2393.630.002.119.00192.200.053.020.03
2403.755.002.119.00195.380.053.020.03
2413.880.002.119.00198.550.053.020.03
2424.005.002.119.001101.730.053.020.03
2434.130.002.119.001104.900.053.020.03
2444.255.002.119.001108.080.053.020.03
2454.380.002.119.001111.250.053.020.03
2464.505.002.119.001114.430.053.020.03
2474.630.002.119.001117.600.053.020.03
2484.755.002.119.001120.780.053.020.03
2494.880.002.119.001123.950.053.020.03
2505.005.002.119.001127.130.053.020.03
2515.130.002.119.001130.300.053.020.03
2525.255.002.119.001133.480.053.020.03
2535.380.002.119.001136.650.053.020.03
2545.505.002.119.001139.830.053.020.03
2555.630.002.119.001143.000.053.020.03
2565.755.002.119.001146.180.053.020.03
2575.880.002.119.001149.350.053.020.03
2586.005.002.119.001152.530.053.020.03
2596.255.002.119.001158.880.053.020.03
2606.505.002.119.001165.230.053.020.03
2616.755.002.119.001171.580.053.020.03
2627.005.002.119.001177.930.053.020.03
2637.255.002.119.001184.280.053.020.03
2647.505.002.119.001190.630.053.020.03
2657.755.002.119.001196.980.053.020.03
2668.005.002.119.001203.330.053.020.03
2678.255.002.119.001209.680.053.020.03
2688.505.002.119.001216.030.053.020.03
2698.755.002.119.001222.380.053.020.03
2709.005.003.119.001228.730.083.020.03
2719.255.003.119.001235.080.083.020.03
2729.505.003.119.001241.430.083.020.03
2739.755.003.119.001247.780.083.020.03
27410.005.003.119.001254.130.083.020.03
27510.505.003.119.001266.830.083.020.03
27611.005.003.119.001279.530.083.020.03
27711.505.003.119.001292.230.083.020.03
27812.005.003.119.001304.930.083.020.03
27913.005.003.119.001330.330.083.020.03
28014.005.003.119.001355.730.083.020.03
28115.005.003.119.001381.130.083.020.03
28216.005.003.119.001406.530.083.020.03
28317.005.003.119.001431.930.083.020.03
28418.005.003.119.001457.330.083.020.03

3/16″ Solid Back-up

Includes MS27595
Ht= .073″ ±.002 (1.85mm ±0.05)
Size ReferenceID (inch)±W (inch)±ID (mm)±W (mm)±
309.435.002.185.00111.050.054.700.05
310.497.002.185.00112.620.054.700.05
311.560.002.185.00114.220.054.700.05
312.622.002.185.00115.800.054.700.05
313.685.002.185.00117.400.054.700.05
314.747.002.185.00118.970.054.700.05
315.810.002.185.00120.570.054.700.05
316.872.002.185.00122.150.054.700.05
317.935.002.185.00123.750.054.700.05
318.997.002.185.00125.320.054.700.05
3191.060.002.185.00126.920.054.700.05
3201.122.002.185.00128.500.054.700.05
3211.185.002.185.00130.100.054.700.05
3221.247.002.185.00131.670.054.700.05
3231.310.002.185.00133.270.054.700.05
3241.372.002.185.00134.850.054.700.05
3251.497.002.185.00138.020.054.700.05
3261.622.002.185.00141.200.054.700.05
3271.748.002.185.00144.400.054.700.05
3281.873.002.185.00147.570.054.700.05
3291.998.002.185.00150.750.054.700.05
3302.123.002.185.00153.920.054.700.05
3312.248.002.185.00157.100.054.700.05
3322.373.002.185.00160.270.054.700.05
3332.498.002.185.00163.450.054.700.05
3342.623.002.185.00166.620.054.700.05
3352.748.002.185.00169.800.054.700.05
3362.873.002.185.00172.970.054.700.05
3372.998.002.185.00176.150.054.700.05
3383.123.002.185.00179.320.054.700.05
3393.248.002.185.00182.500.054.700.05
3403.373.002.185.00185.670.054.700.05
3413.498.002.185.00188.850.054.700.05
3423.623.002.185.00192.020.054.700.05
3433.748.002.185.00195.200.054.700.05
3443.873.002.185.00198.370.054.700.05
3453.998.002.185.001101.550.054.700.05
3464.123.002.185.001104.720.054.700.05
3474.248.002.185.001107.900.054.700.05
3484.373.002.185.001111.070.054.700.05
3494.498.002.185.001114.250.054.700.05
3504.623.002.185.001117.420.054.700.05
3514.748.002.185.001120.600.054.700.05
3524.873.002.185.001123.770.054.700.05
3534.998.002.185.001126.950.054.700.05
3545.123.002.185.001130.120.054.700.05
3555.248.002.185.001133.300.054.700.05
3565.373.002.185.001136.470.054.700.05
3575.498.002.185.001139.650.054.700.05
3585.623.002.185.001142.820.054.700.05
3595.748.002.185.001146.000.054.700.05
3605.873.002.185.001149.170.054.700.05
3615.998.002.185.001152.350.054.700.05
3626.248.002.185.001158.700.054.700.05
3636.498.002.185.001165.050.054.700.05
3646.748.002.185.001171.400.054.700.05
3656.998.002.185.001177.750.054.700.05
3667.248.002.185.001184.100.054.700.05
3677.498.002.185.001190.450.054.700.05
3687.748.002.185.001196.800.054.700.05
3697.998.002.185.001203.150.054.700.05
3708.249.002.185.001209.520.054.700.05
3718.499.002.185.001215.870.054.700.05
3728.749.002.185.001222.220.054.700.05
3738.999.002.185.001228.570.054.700.05
3749.249.003.185.001234.920.084.700.05
3759.499.003.185.001241.270.084.700.05
3769.749.003.185.001247.620.084.700.05
3779.999.003.185.001253.970.084.700.05
37810.499.003.185.001266.670.084.700.05
37911.999.003.185.001304.770.084.700.05
38011.499.003.185.001292.070.084.700.05
38111.999.004.185.001304.770.084.700.05
38212.999.004.185.001330.170.084.700.05
38313.999.004.185.001355.570.084.700.05
38414.999.004.185.001380.970.084.700.05
38515.999.004.185.001406.370.084.700.05
38616.999.004.185.001431.770.084.700.05
38717.999.004.185.001457.170.084.700.05
38818.999.004.185.001482.570.084.700.05
38919.999.004.185.001507.970.084.700.05
39020.999.005.185.001533.370.104.700.05
39121.999.005.185.001558.770.104.700.05
39222.999.005.185.001584.170.104.700.05
39323.999.005.185.001609.570.104.700.05
39424.999.005.185.001634.970.104.700.05
39525.999.005.185.001660.370.104.700.05

1/4″ Solid Back-up

Includes MS27595
Ht= .108″ ±.002 (2.74mm ±0.05)
Size ReferenceID (inch)±W (inch)±ID (mm)±W (mm)±
4254.502.002.236.001114.350.055.990.03
4264.627.002.236.001117.530.055.990.03
4274.752.002.236.001120.700.055.990.03
4284.877.002.236.001123.880.055.990.03
4295.002.002.236.001127.050.055.990.03
4305.127.002.236.001130.230.055.990.03
4315.252.002.236.001133.400.055.990.03
4325.377.002.236.001136.580.055.990.03
4335.502.002.236.001139.750.055.990.03
4345.627.002.236.001142.930.055.990.03
4355.752.002.236.001146.100.055.990.03
4365.877.002.236.001149.280.055.990.03
4376.002.002.236.001152.450.055.990.03
4386.252.002.236.001158.800.055.990.03
4396.502.002.236.001165.150.055.990.03
4406.752.002.236.001171.500.055.990.03
4417.002.002.236.001177.850.055.990.03
4427.252.002.236.001184.200.055.990.03
4437.502.002.236.001190.550.055.990.03
4447.752.002.236.001196.900.055.990.03
4458.002.002.236.001203.250.055.990.03
4468.502.003.236.001215.950.085.990.03
4479.002.003.236.001228.650.085.990.03
4489.502.003.236.001241.350.085.990.03
44910.002.003.236.001254.050.085.990.03
45010.502.003.236.001266.750.085.990.03
45111.002.004.236.001279.450.105.990.03
45211.502.004.236.001292.150.105.990.03
45312.002.004.236.001304.850.105.990.03
45412.502.004.236.001317.550.105.990.03
45513.002.004.236.001330.250.105.990.03
45613.502.005.236.001342.950.135.990.03
45714.002.005.236.001355.650.135.990.03
45814.502.005.236.001368.350.135.990.03
45915.002.005.236.001381.050.135.990.03
46015.502.005.236.001393.750.135.990.03
46116.002.006.236.001406.450.155.990.03
46216.502.006.236.001419.150.155.990.03
46317.002.006.236.001431.850.155.990.03
46417.502.006.236.001444.550.155.990.03
46518.002.006.236.001457.250.155.990.03
46618.502.007.236.001469.950.185.990.03
46719.002.007.236.001482.650.185.990.03
46819.502.007.236.001495.350.185.990.03
46920.002.007.236.001508.050.185.990.03
47021.002.007.236.001533.450.185.990.03
47122.002.008.236.001558.850.205.990.03
47223.002.008.236.001584.250.205.990.03
47324.002.008.236.001609.650.205.990.03
47425.002.008.236.001635.050.205.990.03
47526.002.008.236.001660.450.205.990.03

Metric Solid Back-up Sizes

JIS B2407 P Series Metric Back-up

Size ReferenceID±ODHt±
P33.00±0.306.001.25±0.10
P44.00±0.307.001.25±0.10
P55.00±0.308.001.25±0.10
P66.00±0.309.001.25±0.10
P77.00±0.3010.001.25±0.10
P88.00±0.3011.001.25±0.10
P99.00±0.3012.001.25±0.10
P1010.00±0.3013.001.25±0.10
P10A10.00±0.3013.001.25±0.10
P1111.00±0.3015.001.25±0.10
P11.211.20±0.3015.201.25±0.10
P1212.00±0.3016.001.25±0.10
P12.512.50±0.3016.501.25±0.10
P1414.00±0.3018.001.25±0.10
P1515.00±0.3019.001.25±0.10
P1616.00±0.3020.001.25±0.10
P1818.00±0.3022.001.25±0.10
P2020.00±0.3024.001.25±0.10
P2121.00±0.3025.001.25±0.10
P2222.00±0.3026.001.25±0.10
P22A22.00±0.4028.001.25±0.10
P22.422.40±0.4028.401.25±0.10
P2424.00±0.4030.001.25±0.10
P2525.00±0.4031.001.25±0.10
P25.525.50±0.4031.501.25±0.10
P2626.00±0.4032.001.25±0.10
P2828.00±0.4034.001.25±0.10
P2929.00±0.4035.001.25±0.10
P29.529.50±0.4035.501.25±0.10
P3030.00±0.4036.001.25±0.10
P3131.00±0.4037.001.25±0.10
P31.531.50±0.4037.501.25±0.10
P3232.00±0.4038.001.25±0.10
P3434.00±0.4040.001.25±0.10
P3535.00±0.4041.001.25±0.10
P35.535.50±0.4041.501.25±0.10
P3636.00±0.4042.001.25±0.10
P3838.00±0.4044.001.25±0.10
P4040.00±0.4046.001.25±0.10
P4141.00±0.4047.001.25±0.10
P4242.00±0.4048.001.25±0.10
P4444.00±0.4050.001.25±0.10
P4545.00±0.4051.001.25±0.10
P4646.00±0.4052.001.25±0.10
P4848.00±0.4054.001.25±0.10
P48A48.00±0.5058.001.90±0.13
P4949.00±0.4055.001.25±0.10
P5050.00±0.4056.001.25±0.10
P50A50.00±0.5060.001.90±0.13
P5252.00±0.5062.001.90±0.13
P5353.00±0.5063.001.90±0.13
P5555.00±0.5065.001.90±0.13
P5656.00±0.5066.001.90±0.13
P5858.00±0.5068.001.90±0.13
P6060.00±0.5070.001.90±0.13
P6262.00±0.5072.001.90±0.13
P6363.00±0.5073.001.90±0.13
P6565.00±0.5075.001.90±0.13
P6767.00±0.5077.001.90±0.13
P7070.00±0.5080.001.90±0.13
P7171.00±0.5081.001.90±0.13
P7575.00±0.5085.001.90±0.13
P8080.00±0.5090.001.90±0.13
P8585.00±0.5095.001.90±0.13
P8686.00±0.5096.001.90±0.13
P9090.00±0.50100.001.90±0.13
P9595.00±0.50105.001.90±0.13
P100100.00±0.50110.001.90±0.13
P102102.00±0.50112.001.90±0.13
P105105.00±0.50115.001.90±0.13
P110110.00±0.50120.001.90±0.13
P111111.00±0.50121.001.90±0.13
P112112.00±0.50122.001.90±0.13
P115115.00±0.50125.001.90±0.13
P120120.00±0.50130.001.90±0.13
P125125.00±0.50135.001.90±0.13
P130130.00±0.50140.001.90±0.13
P132132.00±0.50142.001.90±0.13
P135135.00±0.50145.001.90±0.13
P140140.00±0.50150.001.90±0.13
P145145.00±0.50155.001.90±0.13
P150150.00±0.50160.001.90±0.13
P150A150.00±0.60165.002.75±0.15
P155155.00±0.60170.002.75±0.15
P160160.00±0.60175.002.75±0.15
P165165.00±0.60175.002.75±0.15
P170170.00±0.60185.002.75±0.15
P175175.00±0.60190.002.75±0.15
P180180.00±0.60195.002.75±0.15
P185185.00±0.60200.002.75±0.15
P190190.00±0.60205.002.75±0.15
P195195.00±0.60210.002.75±0.15
P200200.00±0.60215.002.75±0.15
P205205.00±0.60220.002.75±0.15
P209209.00±0.60224.002.75±0.15
P210210.00±0.60225.002.75±0.15
P215215.00±0.60230.002.75±0.15
P220220.00±0.60235.002.75±0.15
P225225.00±0.60240.002.75±0.15
P230230.00±0.60245.002.75±0.15
P235235.00±0.60250.002.75±0.15
P240240.00±0.60255.002.75±0.15
P245245.00±0.60260.002.75±0.15
P250250.00±0.60265.002.75±0.15
P255255.00±0.60270.002.75±0.15
P260260.00±0.60275.002.75±0.15
P265265.00±0.60280.002.75±0.15
P270270.00±0.60285.002.75±0.15
P275275.00±0.60290.002.75±0.15
P280280.00±0.60295.002.75±0.15
P285285.00±0.60300.002.75±0.15
P290290.00±0.60305.002.75±0.15
P295295.00±0.60310.002.75±0.15
P300300.00±0.60315.002.75±0.15
P315315.00±0.60330.002.75±0.15
P320320.00±0.60335.002.75±0.15
P335335.00±0.60350.002.75±0.15
P360360.00±0.60375.002.75±0.15
P375375.00±0.60380.002.75±0.15
P385385.00±0.60400.002.75±0.15
P400400.00±0.60415.002.75±0.15

JIS B2407 G Series Metric Back-up

Size ReferenceID±ODHt±
G2525.00±0.4030.001.25±0.10
G3030.00±0.4035.001.25±0.10
G3535.00±0.4040.001.25±0.10
G4040.00±0.4045.001.25±0.10
G4545.00±0.4050.001.25±0.10
G5050.00±0.4055.001.25±0.10
G5555.00±0.5060.001.25±0.10
G6060.00±0.5075.001.25±0.10
G6565.00±0.5070.001.25±0.10
G7070.00±0.5075.001.25±0.10
G7575.00±0.5080.001.25±0.10
G8080.00±0.5085.001.25±0.10
G8585.00±0.5090.001.25±0.10
G9090.00±0.5095.001.25±0.10
G9595.00±0.50100.001.25±0.10
G100100.00±0.50105.001.25±0.10
G105105.00±0.50110.001.25±0.10
G110110.00±0.50115.001.25±0.10
G115115.00±0.50120.001.25±0.10
G120120.00±0.50125.001.25±0.10
G125125.00±0.50130.001.25±0.10
G130130.00±0.50135.001.25±0.10
G135135.00±0.50140.001.25±0.10
G140140.00±0.50145.001.25±0.10
G145145.00±0.50150.001.25±0.10
G150150.00±0.50160.001.25±0.10
G155155.00±0.50165.001.25±0.10
G160160.00±0.50170.001.25±0.10
G165165.00±0.50175.001.25±0.10
G170170.00±0.50180.001.25±0.10
G175175.00±0.50185.001.25±0.10
G180180.00±0.50190.001.25±0.10
G185185.00±0.50195.001.25±0.10
G190190.00±0.50200.001.25±0.10
G195195.00±0.50205.001.25±0.10
G200200.00±0.60210.001.90±0.13
G210210.00±0.60220.001.90±0.13
G220220.00±0.60230.001.90±0.13
G230230.00±0.60240.001.90±0.13
G240240.00±0.60250.001.90±0.13
G250250.00±0.60260.001.90±0.13
G260260.00±0.60270.001.90±0.13
G270270.00±0.60280.001.90±0.13
G280280.00±0.60290.001.90±0.13
G290290.00±0.60300.001.90±0.13
G300300.00±0.60310.001.90±0.13
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