ISO 14581

Name: ISO 14581: Countersunk head screw, hexalobular (Torx) drive
Creator: MechLab Geek

Countersunk head screw,hexalobular (Torx) drive

ISO standard (2022) · ISO 7046-1 with a Torx socket · Sizes M2–M10

ISO 14581 countersunk screw side view with the socket drawn dashed, showing d, P, dk, k, l and the socket depth t — Side view

ISO 14581 countersunk screw seen from the head, with the Torx socket width A — Head view

Size

Pmm · coarse

dkmm · max

kmm · max

Tnom.

Amm · nom.

tmm · min

Size	P (mm, coarse)	dk (mm, max)	k (mm, max)	T (nom.)	A (mm, nom.)	t (mm, min)
M2	0.40	3.80	1.20	6	1.75	0.51
M2.5	0.45	4.70	1.50	8	2.40	0.66
M3	0.50	5.50	1.65	10	2.80	0.70
(M3.5)	0.60	7.30	2.35	15	3.35	1.16
M4	0.70	8.40	2.70	20	3.95	1.14
M5	0.80	9.30	2.70	25	4.50	1.12
M6	1.00	11.30	3.30	30	5.60	1.39
M8	1.25	15.80	4.65	45	7.95	2.15
M10	1.50	18.30	5.00	50	8.95	2.41

Values per ISO 14581:2013. The values follow this edition; the current one is ISO 14581:2022.

Work out the screw length you needOpens the bolted joint configurator with ISO 14581 chosen.

Verified data

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References

ISO 14581:2022 Fasteners — Hexalobular socket countersunk flat head screws (common head style) with reduced loadability
ISO 7046-1:2011 Countersunk flat head screws (common head style) with type H or type Z cross recess — Product grade A — Part 1: Steel screws of property class 4.8