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ASME B16.20 Spiral Wound Gasket for ASME B16.5 Flange

Flange Size
(NPS)
Outside Diameter of GasketInside Diameter of Gasket by Class(1)(2)Outside Diameter of Centering Ring by Class(3)
Classes150, 300, 400, 600Classes 900, 1500, 2500150300400(4)600900(4)15002500(4)150300400(4)600900(4)15002500(4)
1/231.831.819.119.119.119.119.147.854.154.163.569.9
3/439.639.625.425.425.425.425.457.266.866.869.976.2
147.847.831.831.831.831.831.866.873.273.279.585.9
1 1/460.560.547.847.847.839.639.676.282.682.688.9104.9
1 1/269.969.954.154.154.147.847.885.995.395.398.6117.6
285.985.969.969.969.958.758.7104.9111.3111.3143.0146.1
2 1/298.698.682.682.682.669.969.9124.0130.3130.3165.1168.4
3120.7120.7101.6101.6101.695.392.292.2136.7149.4149.4168.4174.8196.9
4149.4149.4127.0127.0120.7120.7120.7117.6117.6174.8181.1177.8193.8206.5209.6235.0
5177.8177.8155.7155.7147.6147.6147.6143.0143.0196.9215.9212.9241.3247.7254.0279.4
6209.6209.6182.6182.6174.8174.8174.8171.5171.5222.3251.0247.7266.7289.1282.7317.5
8263.7257.3233.4233.4225.6225.6222.3215.9215.9279.4308.1304.8320.8358.9352.6387.4
10317.5311.2287.3287.3274.6274.6276.4266.7270.0339.9362.0358.9400.1435.1435.1476.3
12374.7368.3339.9339.9327.2327.2323.9323.9317.5409.7422.4419.1457.2498.6520.7549.4
14406.4400.1371.6371.6362.0362.0355.6362.0450.9485.9482.6492.3520.7577.9
16463.6457.2422.4422.4412.8412.8412.8406.4514.4539.8536.7565.2574.8641.4
18527.1520.7474.7474.7469.9469.9463.6463.6549.4596.9593.9612.9638.3704.9
20577.9571.5525.5525.5520.7520.7520.7514.4606.6654.1647.7682.8698.5755.7
24685.8679.5628.7628.7628.7628.7628.7616.0717.6774.7768.4790.7838.2901.7
(1) The gasket outside diameter tolerance for NPS 1/2 through NPS 8 is ±0.8mm; for NPS 10 through NPS 24, +1.5mm, -0.8mm.
(2) The gasket inside diameter tolerance for NPS 1/2 through NPS 8 is ±0.4mm; for NPS 10 through NPS 24, ±0.8mm.
(3) The centering ring outside diameter tolerance is ±0.8mm.
(4) There are no Class 400 flange in NPS 1/2 through NPS 3(use Class 600), Class 900 flanges in NPS 1/2 through NPS 2-1/2(use Class 1500), or Class 2500 flanges NPS 14 and larger.

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