美制管牙絲攻, NPT, NPS. 1/16-27, 6.25, 6.35. 1/8-27, 8.43, 8.74. 1/4-18, 11.13, 11.13. 3/8-18, 14.28, 14.68. 1/2-14, 17.86, 18.26. 3/4-14, 23.01, 23.42.
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