Click Specification

M10

M12

(Non-preferred) dimensions in parentheses.

Flat Round Head Weld Bolts

JIS B 1195 - 2009

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Thread Size
d

M10

M12

P	Pitch	Coarse thread
		Fine thread
d_k	Nominal Size
	max
	min
k	Nominal Size
	max
	min
d₁	Nominal Size
	max
	min
h	Nominal Size
	max
	min
d₀	max
r

0.7	0.8	1	1.25	1.5	1.75
/	/	/	1	1.25	1.25
10	12	14	18	22	26
10.4	12.4	14.4	18.4	22.4	26.4
9.6	11.6	13.6	17.6	21.6	25.6
1.3	1.8	2	2.5	3.5	4.5
1.5	2	2.2	2.7	3.7	4.7
1.1	1.6	1.8	2.3	3.3	4.3
1.5	2	2.5	3	4	4
1.75	2.25	2.75	3.25	4.25	4.25
1.25	1.75	2.25	2.75	3.75	3.75
0.7	0.7	0.8	0.8	1	1
0.8	0.8	0.9	0.9	1.1	1.1
0.6	0.6	0.7	0.7	0.9	0.9
8.5	10	11.5	15	18	21
0.2~0.5	0.2~0.6	0.25~0.7	0.4~0.9	0.4~1.2	0.6~1.4

①,a≤4P
②, The shape of screw end shall be as rolled end for bolts with nominal screw thread of M8 or less and chamfered end or flat point for those with nominal screw thread of M10 or more. The as·rolled end shall ensure good leading into internal screw thread.

When chamfered end or flat point is required for bolt with nominal screw thread of M8 or less, it shall be specified by the purchaser.

Alternative history

JIS B 1195 - 1994 JIS B 1195 - 2009

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