Coarse thread

Coarse threadISO 261 (JIS B 0205)The ordinary thread, with one pitch fixed for each nominal diameter. Use it unless something else is specified.Fine threadISO 261 (JIS B 0205)A thread with a finer pitch than the coarse series at the same nominal diameter. Choose it for fastening thin parts, or where you need resistance to loosening or fine control of the axial force.

Hexagon head bolt, coarse thread

Diagram: Hexagon head bolt Coarse thread

Filter by nominal size

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

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