길이 ℓ △標는 되도록 사용하지 않는다.
S는 너트측의 나사部 길이며 △標인 것일 때는 아래의 a값을 표준길이로 하는 円簡部를 남기고 나사를 가공한다.
呼稱經 a 4, 5, 6 1 8,10.12 2 14,16,18,20 3
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