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Absolute vacuum services Uk supplies o rings and seals here is an o ring size chart to help you.

This is a use at your own risk condensed chart,more complete data is available from the o-ring manufacturers.

Rotatable fitting centering ring o-rings nw 10 nw 16 nw 25 nw 40 nw 50 are commonly used for rough vacuum applications. The NW and KF prefixes have now been replaced with the DN prefix by some manufacturers of these universal metric fittings, DN is supposed to be preferred now.

Cross Index for Old Edwards Fittings:

We have a lot of them here,if you don't need this skip to the

standard chart.

Old #I.D.W.

VOR00060.1140 (1/8")0.0700 closest std

VOR2A0.1870 (3/16 ")0.1030 closest std

VOR4A0.3120 (5/16 ")0.1030 closest std

VOR01110.4240 (7/16 ")0.1030 closest std

VOR01120.4870 (1/2 ")0.1030 closest std

VOR01130.5490 (9/16 ")0.1030 closest std

VOR01140.6250 (5/8 ")0.1030 s.vac 1/2 " closest std

VOR01150.6740 (11/16 ")0.1030 closest std

VOR02161.1090 (1 1/8 ")0.1390 s.vac 1" closest std

VOR02181.2340 (1 1/4 ")0.1390 closest std

VOR03302.1000 (2 1/8 ")0.2100 closest std

VOR11210.6250 (5/8 ")0.1030 closest std

VOR11461.6250 (1 5/8 ")0.1390 closest std

VOR11552.0000 (2 ")0.1390 closest std

VOR11612.2500 (2 1/4 ")0.1390 closest std

Standard O Ring Chart

O RING

SIZEI.D.WIDTH

(Inches)(Inches)

.0010.029.040

.0020.042.050

.0030.056.060

.0040.070.070

.0050.101.070

.0060.114.070 VOR 0006 

.0070.145.070

.0080.176.070

.0090.208.070

.0100.239.070

.0110.301.070

.0120.364.070

.0130.426.070

.0140.489.070

.0150.551.070

.0160.614.070

.0170.676.070

.0180.739.070

.0190.801.070

.0200.864.070

.0210.926.070

.0220.989.070

.0231.051.070

.0241.114.070

.0251.176.070

.0261.239.070

.0271.301.070

.0281.364.070

.0291.489.070

.0301.614.070

.0311.739.070

.0321.864.070

.0331.989.070

.0342.114.070

.0352.239.070

.0362.364.070

.0372.489.070

.0382.614.070

.0392.739.070

.0402.864.070

.0412.989.070

.0423.239.070

.0433.489.070

.0443.739.070

.0453.989.070

.0464.239.070

.0474.489.070

.0484.739.070

.0494.989.070

.0505.239.070

1020.049.103

1030.081.103

1040.112.103

1050.143.103

1060.174.103 VOR 2A 

1070.206.103

1080.237.103

1090.299.103 VOR 4A 

1100.362.103

1110.424.103 VOR0111 

1120.487.103 VOR0112 

1130.549.103 VOR0113 

1140.612.103 VOR0114,1121 

1150.674.103 VOR0115 

1160.737.103

1170.799.103

1180.762.103

1190.924.103

1200.987.103

1211.049.103

1221.112.103

1231.174.103

1241.237.103

1251.299.103

1261.362.103

1271.424.103

1281.487.103

1291.549.103

1301.612.103

1311.674.103

1321.737.103

1331.799.103

1341.862.103

1351.925.103

1361.987.103

1372.050.103

1382.112.103

1392.175.103

1402.237.103

1412.300.103

1422.362.103

1432.425.103

1442.487.103

1452.550.103

1462.612.103

1472.675.103

1482.737.103

1492.800.103

1502.862.103

1512.987.103

1523.237.103

1533.487.103

1543.737.103

1553.987.103

1564.237.103

1574.487.103

1584.737.103

1594.987.103

1605.237.103

1615.487.103

1625.737.103

1635.987.103

1646.237.103

1656.487.103

1666.737.103

1676.987.103

1687.237.103

1697.487.103

1707.737.103

1717.987.103

1728.237.103

1738.487.103

1748.737.103

1758.987.103

1769.237.103

1779.487.103

1789.737.103

2010.171.139

2020.234.139

2030.296.139

2040.359.139

2050.421.139

2060.484.139

2070.546.139

2080.609.139

2090.671.139

2100.734.139

2110.796.139

2120.859.139

2130.921.139

2140.984.139

2151.046.139

2161.109.139 VOR0111 1" Sv. 

2171.171.139

2181.234.139 VOR0218 

2191.296.139

2201.359.139

2211.421.139

2221.484.139

2231.609.139 VOR 1146 

2241.734.139

2251.859.139

2261.984.139 VOR 1155 

2272.109.139

2282.234.139 VOR 1161 

2292.359.139

2302.484.139

2312.609.139

2322.734.139

2332.859.139

2342.984.139

2353.109.139

2363.324.139

2373.359.139

2383.484.139

2393.609.139

2403.734.139

2413.859.139

2423.984.139

2434.109.139

2444.234.139

2454.359.139

2464.484.139

2474.609.139

2484.734.139

2494.859.139

2504.984.139

2515.109.139

2525.234.139

2535.359.139

2545.484.139

2555.609.139

2565.734.139

2575.859.139

2585.984.139

2596.234.139

2606.484.139

2616.734.139

2626.984.139

2637.234.139

2647.484.139

2657.734.139

2667.984.139

2678.234.139

2688.484.139

2698.734.139

2708.984.139

2719.234.139

2729.484.139

2739.734.139

2749.984.139

27510.484.139

27610.984.139

27711.484.139

27811.984.139

27912.984.139

28013.984.139

28114.984.139

28215.955.139

28316.955.139

28417.955.139

3090.412.210

3100.475.210

3110.537.210

3120.600.210

3130.662.210

3140.725.210 (NW 16 size)

3150.787.210

3160.850.210

3170.912.210

3180.975.210

3191.037.210

3201.100.210 (NW 25 size) 

321 1.162.210

3221.225.210

3231.287.210

3241.350.210

3251.475.210

3261.600.210 (NW 40 size) 

3271.725.210

3281.850.210

3291.975.210

3302.100.210 (NW50,VOR330) 

3312.225.210

3322.350.210

3332.475.210

3342.600.210

3352.725.210

3362.850.210

3372.975.210

3383.100.210

3393.225.210

3403.350.210

3413.475.210

3423.600.210

3433.725.210

3443.850.210

3453.975.210

3464.100.210

3474.225.210

3484.350.210

3494.475.210

3504.600.210

3514.725.210

3524.850.210

3534.975.210

3545.100.210

3555.225.210

3565.350.210

3575.475.210

3585.600.210

3595.725.210

3605.850.210

3615.975.210

3626.225.210

3636.475.210

3646.725.210

3656.975.210

3667.225.210

3677.475.210

3687.725.210

3697.975.210

3708.225.210

3718.475.210

3728.725.210

3738.975.210

3749.225.210

3759.475.210

3769.725.210

3779.975.210

37810.475.210

37910.975.210

38011.475.210

38111.975.210

38213.975.210

38313.975.210

38414.975.210

38515.955.210

38616.955.210

38717.955.210

38818.955.210

38919.955.210

39020.955.210

39121.955.210

39222.940.210

39323.940.210

39424.940.210

39525.940.210

4254.475.275

4264.600.275

4274.725.275

4284.850.275

4294.975.275

4305.100.275

4315.225.275

4325.350.275

4335.475.275

4345.600.275

4355.725.275

4365.850.275

4375.975.275

4386.225.275

4396.475.275

4406.725.275

4416.975.275

4427.225.275

4437.475.275

4447.725.275

4457.975.275

4468.475.275

4478.975.275

4489.475.275

4499.975.275

45010.475.275

45110.975.275

45211.475.275

45311.975.275

45412.475.275

45512.975.275

45613.475.275

45713.975.275

45814.475.275

45914.975.275

46015.475.275

46115.955.275

46216.455.275

46316.955.275

46417.455.275

46517.955.275

46618.455.275

46718.955.275

46819.455.275

46919.955.275

47020.955.275

47121.955.275

47222.940.275

47323.940.275

47424.940.275

47525.940.275

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