M6 Button Head Screw (Button Head Allen Bolt), ISO 7380-1

An M6 button head screw (ISO 7380-1) has a head 10.07 to 10.5 mm across and 3 to 3.3 mm tall, driven with a 4 mm hex key. This page has 12 lengths from 10 to 60 mm, each as simplified and threaded STEP.

How these parts are made, and what the levels mean: read the method

• Also searched as: M6 bolt, M6 x 10 to M6 x 60 bolts
• Model id: iso7380-m6
• Standard: ISO 7380-1:2011 · thread M6 × 1, ISO metric coarse, right hand

Lengths

Length (mm)	Part key	Simplified	Threaded
10	iso7380-m6x10	STEP	STEP
12	iso7380-m6x12	STEP	STEP
16	iso7380-m6x16	STEP	STEP
20	iso7380-m6x20	STEP	STEP
25	iso7380-m6x25	STEP	STEP
30	iso7380-m6x30	STEP	STEP
35	iso7380-m6x35	STEP	STEP
40	iso7380-m6x40	STEP	STEP
45	iso7380-m6x45	STEP	STEP
50	iso7380-m6x50	STEP	STEP
55	iso7380-m6x55	STEP	STEP
60	iso7380-m6x60	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
P	Thread pitch		1		1	nominal	L2
b	Thread length		24 ref		24	reference value	L2
da	Transition diameter			6.8	6.8	single limit (max), modeled at the limit	L2
dk	Head diameter	10.07		10.5	10.285	midpoint of min–max	L2
dL	Head top diameter		6 ref		6	reference value	L2
ds	Shank diameter	5.82		6	5.91	midpoint of min–max	L2
dw	Bearing face diameter	9.57			9.57	single limit (min), modeled at the limit	L2
e	Socket width across corners	4.583			4.583	single limit (min), modeled at the limit	L2
k	Head height	3		3.3	3.15	midpoint of min–max	L2
rf	Head dome radius	5.65		6.15	5.9	midpoint of min–max	L2
rs	Underhead fillet radius, plain shank	0.25			0.25	single limit (min), modeled at the limit	L2
rt	Underhead fillet radius, fully threaded	0.5			0.5	single limit (min), modeled at the limit	L2
s	Socket width across flats	4.02	4	4.095	4.0575	midpoint of min–max	L2
t	Socket depth	2.08			2.08	single limit (min), modeled at the limit	L2
w	Wall thickness	0.74			0.74	single limit (min), modeled at the limit	L2
P	Coarse thread pitch		1		1	nominal	L1
tap_drill	Tap drill diameter		5		5	nominal	L1
d1	Basic minor diameter		4.917468		4.917468	nominal	L1
ch_angle	Chamfered end angle			50	50	single limit (max), modeled at the limit	L2
dh_fine	Clearance hole, fine series		6.4		6.4	nominal	L1
dh_medium	Clearance hole, medium series		6.6		6.6	nominal	L1
dh_coarse	Clearance hole, coarse series		7		7	nominal	L1

Thread and holes

• Tap drill: 5 mm (method: d − P), L1, sources amesweb-tap-drill, rule-tap-drill.
• Clearance hole (ISO 273): close 6.4, normal 6.6, loose 7 mm (L1: fine, medium and coarse series (albany-clearance, wikipedia-de-clearance)).

Drawing

As a PDF: CC-ISO7380-SZ-M6.pdf.

Goes with the M6 button head screw

• Hex key: 4 mm, the socket's nominal width across flats (s) in the table above.
• ISO 4032 hex nut, the same size as this M6 button head screw: M6 Hex Nut (Hexagon Nut), ISO 4032 / DIN 934
• ISO 7089 flat washer, the same size as this M6 button head screw: M6 Flat Washer (Plain Washer), ISO 7089

The M6 button head screw beside the M5 and the M8

The M6 is number 4, counting from the smallest, of the 5 ISO 7380-1 button head screws published here, from M3 to M8.

• Thread pitch (P): 1 mm on the M6 button head screw, against 0.8 mm on the M5 and 1.25 mm on the M8.
• Thread length (b): 24 mm (reference) on the M6 button head screw, against 22 mm (reference) on the M5 and 28 mm (reference) on the M8.
• Transition diameter (da): up to 6.8 mm on the M6 button head screw, against up to 5.7 mm on the M5 and up to 9.2 mm on the M8.
• Head diameter (dk): 10.07 to 10.5 mm on the M6 button head screw, against 9.14 to 9.5 mm on the M5 and 13.57 to 14 mm on the M8.
• Head top diameter (dL): 6 mm (reference) on the M6 button head screw, against 5 mm (reference) on the M5 and 7.7 mm (reference) on the M8.
• Shank diameter (ds): 5.82 to 6 mm on the M6 button head screw, against 4.82 to 5 mm on the M5 and 7.78 to 8 mm on the M8.
• Bearing face diameter (dw): at least 9.57 mm on the M6 button head screw, against at least 8.74 mm on the M5 and at least 13.07 mm on the M8.
• Socket width across corners (e): at least 4.583 mm on the M6 button head screw, against at least 3.443 mm on the M5 and at least 5.723 mm on the M8.

Other sizes

• One size smaller: M5 Button Head Screw (Button Head Allen Bolt), ISO 7380-1, 9.14 to 9.5 mm head, 3 mm hex key.
• One size larger: M8 Button Head Screw (Button Head Allen Bolt), ISO 7380-1, 13.57 to 14 mm head, 5 mm hex key.

Documents

• CC-ISO7380-DS-M6.pdf: M6 datasheet: values with levels, lengths, sources
• CC-ISO7380-SZ-M6.pdf: M6 drawing: this size's values on the views
• parts.json: the part record of every length (the platform contract)

Sources

albany-clearance, amesweb-iso7380-1, amesweb-iso7380-1-lengths, amesweb-tap-drill, bossard-bn19-lengths, fasten-it-iso7380-1, fasteners-eu-iso7380-1, iso4753-2011-sample, iso7380-1-2011-sample, iso7380-1-2011-sample-lengths, rule-basic-minor, rule-tap-drill, wikipedia-de-clearance, wikipedia-iso261. Full citations: the method page and this size's datasheet.

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