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Coarse thread

Coarse threadISO 4762 (JIS B 1176)呼び径ごとにピッチが決まっている一般的なねじです。特に指定がなければこちらを使います。Fine threadISO 4762 (JIS B 1176)同じ呼び径で並目よりピッチが細かいねじです。薄い部材への締結や、緩みにくさ・軸力の微調整が要る場合に選びます。

Hexagon socket head cap screw, coarse thread

Diagram: Hexagon socket head cap screw Coarse thread
Nominal diameter
Threaded portionkdkSTapping drill diameterClearance hole diameterCounterbore diameterCounterbore depth
PitchMajor diameterPitch diameterMinor diameterClass 1Class 2Class 3

Notes

  • References
    • JIS B 1176
    • JIS B 0205-4
    • JIS B 1001
    • JIS B 1176:1994
  • The tapping drill diameter is calculated as
    d′=d−Pd'=d-P

    d′d': tapping drill diameter, dd: nominal diameter, PP: pitch
Bolts — Hexagon socket head cap screw — Coarse thread | Updraft - Mechanical Engineering Calculators