ʻO nā kaulahao 20A-1/20B-1 he ʻano ʻano kaulahao wili, a ʻokoʻa lākou i nā ʻāpana ʻokoʻa.I waena o lākou, ʻo ka pitch nominal o ke kaulahao 20A-1 he 25.4 mm, ʻo ke anawaena o ke kumu he 7.95 mm, ʻo ka laulā o loko he 7.92 mm, a ʻo ka laulā o waho he 15.88 mm;ʻoiai ʻo ka pitch nominal ...
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