編號, 規格, T, L, L1, H. TH x TH x TH, UNF/UN (thread). THH-04-T, 1/4 x 1/4 x 1/4, 7/16-20, 52, 26, 14. THH-06-T, 3/8 x 3/8 x 3/8, 9/16-18, 52, 26, 14.
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