Click Specification

Metric Hexagon Lag Screws

ASME/ANSI B 18.2.3.8M - 1981 (R1999)

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Thread Size
d

P	pitch
d_s	max
d_s	min
s	max
s	min
e	max
e	min
k	max
k	min
k₁	min
R	max
R	min

2.3	2.5	2.8	3.6	4.2	5.1	5.6	7.3
5.48	6.48	8.58	10.58	12.7	16.7	20.84	24.84
4.52	5.52	7.42	9.42	11.3	15.3	19.16	23.16
8	10	13	16	18	24	30	36
7.64	9.64	12.57	15.57	17.57	23.16	29.16	35
9.24	11.55	15.01	18.48	20.78	27.71	34.64	41.57
8.63	10.89	14.2	17.59	19.85	26.17	32.95	39.55
3.9	4.4	5.7	6.9	8	10.8	13.4	15.9
3.1	3.6	4.9	5.9	7	9.3	11.6	14.1
2.4	2.8	3.7	4.5	5.2	7	8.8	10.5
0.6	0.9	1.2	1.2	1.8	1.8	2.4	2.4
0.2	0.3	0.4	0.4	0.6	0.6	0.8	0.8

①,Thread Length b . The minimum thread length shall be equal to one-half of the nominal screw length plus 12 mm, or 150 mm, whichever is shorter. Screws too short for the formula thread length shall be threaded as close to the head or shoulder as practicable.

Alternative history

ANSI/ASME B 18.2.3.8M - 1981 ANSI/ASME B 18.2.3.8M - 1991

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Similar Standards

1	[DIN] DIN 571 - 2016	Hexagon Head Wood Screws
2	[DIN] DIN 571 - 2008	Hexagon Head Wood Screws
3	[ASME] ASME B 18.2.1 (T15) - 2010	Hex Lag Screws [Table 15]
4	[ASME] ASME B 18.2.1 (T9) - 1996	Hex Lag Screws [Table 9]
5	[ASME] ASME B 18.2.1 (T15) - 2012	Hex Lag Screws [Table 15] (ASTM A307 / F593 / F468 / A394)
6	[DIN] DIN 571 - 2010	Hexagon Head Wood Screws
7	[ASME] ASME B 18.2.1 (T8) - 1996	Square Lag Screws [Table 8]
8	[ASME] ASME B 18.2.1 (T14) - 2010	Square Lag Screws [Table 14]
9	[ASME] ASME B 18.2.1 (T14) - 2012	Square Lag Screws [Table 14] (ASTM A307 / F593 / F468 / A394)
10	[DIN] DIN 571 - 1986	Hexagon Head Wood Screws
11	[NF] NF E 25-608 - 1985	Square Head Wood Screws
12	[NF] NF E 25-607 - 1985	Woodscrews-Hexagon Lag Screws - Symbol H
13	[GB] GB 102 - 1986	Hexagon Head Wood Screws
14	[UNI] UNI 704	Hexagon Head Wood Screws
15	[AS] AS /NZS 1393 - 1996	Coach Screws - Metric Series with ISO Hexagon Heads