Click Specification

(Non-preferred) dimensions in parentheses.

Unified Hexagon Head Forged Bolts

BS 1769 - 1951

Display drawing:

Screw Thread
d

1/2

5/8

3/4

7/8

1-1/8

1-1/4

(1-3/8)

1-1/2

1-3/4

P	UNC
s	max
s	min
e	max
k	max
k	min
R	max
b	L≤6
b	6＜L

13	11	10	9	8	7	7	6	6	5	4-1/2
0.875	1.0625	1.25	1.4375	1.625	1.8125	2	2.1875	2.375	2.75	3.125
0.855	1.0375	1.225	1.4075	1.595	1.7825	1.955	2.1425	2.33	2.69	3.065
1.01	1.23	1.44	1.66	1.88	2.09	2.31	2.53	2.74	3.18	3.61
0.426	0.522	0.618	0.714	0.778	0.874	0.97	1.065	1.161	1.352	1.482
0.386	0.478	0.57	0.662	0.722	0.814	0.906	0.997	1.089	1.272	1.394
1/32	1/16	1/16	1/16	1/16	1/8	1/8	1/8	1/8	1/8	1/8
1.25	1.5	1.75	2	2.25	2.5	2.75	3	3.25	3.75	4.25
1.5	1.75	2	2.25	2.5	2.75	3	3.25	3.5	4	4.5

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