接头数字或尺寸NC26(2-3/8\" IF)(内平扣) 1对于第2个数字NC31(2-7/8\" IF)NC38(3-1/2\" IF)NC46(4\" IF)NC50(4-1/2\" IF)2-7/8\"FH（惯眼）2对于第2个数字3-1/2\"FH4-1/2\"FH5-1/2\"FH6-5/8\"FH2-3/8\"REG （常规扣）3对于第2个数字2-7/8\"REG3-1/2\"REG4-1/2\"REG5-1/2\"REG6-5/8\"REG7-5/8\"REG8-5/8\"REG公扣：Pin公端根径公端小径公扣长度母扣内径对应钻具及钻头国内编码(mm)(mm)(mm)(mm)2-3/8\" DP2-7/8\" DP3-1/2\" DP5\" DP2A11×2A10211×210311×3104A11×4A10411×410221×220321×320421×420521×520621×62073.186.1102122.8133.492.1101.4121.7148171.566.776.288.9117.5140.2152.2177.820260.471.385.1103.7114.370.177.696.3126.8150.447.65465.190.5110.1131144.5167.876.288.9101.6114.3114.38895.2101.612712776.288.995.2108120.6127133.4136.574.687.7103.6124.6134.994.5102.8123.8150.5173.868.377.890.5119.1141.7154180.2204.43-3/4\" BIT6-1/8\" BIT8-1/2\" BIT2A31×2A30231×230331×330431×430531×53012-1/4\"BIT/8\"DC631×63017-1/2\"BIT731×730831×830母扣：Box探伤：Inspection修扣：Repair 焊耐磨带jointing hardbandin母扣长度(mm)79.492.1104.8117.5117.59598.4104.8130.2130.279.492.198.4111.1123.8130.2136.5139.7焊耐磨带jointing hardbanding
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