Fine thread

Coarse threadISO 261 (JIS B 0205)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 261 (JIS B 0205)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 head bolt, fine thread

Diagram: Hexagon head bolt Fine thread

呼び寸法で絞り込む

Nominal diameter	Threaded portion				k	d_k	S	Tapping drill diameter	Clearance hole diameter
Nominal diameter	Pitch	Major diameter	Pitch diameter	Minor diameter	k	d_k	S	Tapping drill diameter	Class 1	Class 2	Class 3

Notes

References

JIS B 0205(1999)
JIB B 1180(2014)
JIS B 1001(1985)

The tapping drill diameter is calculated as
$d'=d-P$

$d'$ : tapping drill diameter, $d$ : nominal diameter, $P$ : pitch

Bolts — Hexagon head bolt — Fine thread — Bolt Dimensions | Updraft - Mechanical Engineering Calculators