M4 Acorn Nut (Cap Nut), DIN 1587

Across the flats an M4 acorn nut (DIN 1587) measures 7 mm, and it stands 8 mm tall on the M4 × 0.7 thread. It comes as simplified and threaded STEP files.

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

• Also searched as: M4 acorn nut
• Model id: din1587-m4
• Standard: DIN 1587:2000 · thread M4 × 0.7, ISO metric coarse, right hand

Files

Part key	Simplified	Threaded
din1587-m4	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
P	Thread pitch		0.7		0.7	nominal	L1
dk	Dome diameter			6.5	6.5	single limit (max), modeled at the limit	L1
h	Overall height	7.64	8	8	8	nominal	L1
m	Hex height	2.9		3.2	3.05	midpoint of min–max	L1
mw	Wrenching height	2.32			2.32	single limit (min), modeled at the limit	L0 (min: one source)
s	Width across flats	6.78	7	7	7	nominal	L1
e	Width across corners	7.66			7.66	single limit (min), modeled at the limit	L1
r	Dome radius		3.25 ref		3.25	reference value	L1
t	Bore depth	5.26		5.74	5.5	midpoint of min–max	L1
x	Thread run-out			1.4	1.4	single limit (max), modeled at the limit	L1
w	Dome wall thickness	2			2	single limit (min), modeled at the limit	L1
da	Countersink diameter	4		4.6	4.3	midpoint of min–max	L0 (min, max: one source)
dw	Bearing face diameter	5.9			5.9	single limit (min), modeled at the limit	L0 (min: one source)
beta	Chamfer angle	15		30	22.5	midpoint of min–max	L0 (min, max: one source)
theta	Countersink angle		120		120	nominal	L0 (nom: one source)
P	Coarse thread pitch		0.7		0.7	nominal	L1
tap_drill	Tap drill diameter		3.3		3.3	nominal	L1
d1	Basic minor diameter		3.2422276		3.2422276	nominal	L1
ch_angle	Chamfered end angle			50	50	single limit (max), modeled at the limit	L2
dh_fine	Clearance hole, fine series		4.3		4.3	nominal	L1
dh_medium	Clearance hole, medium series		4.5		4.5	nominal	L1
dh_coarse	Clearance hole, coarse series		4.8		4.8	nominal	L1

Thread and holes

• Tap drill: 3.3 mm (method: d − P), L1, sources amesweb-tap-drill, rule-tap-drill.
• Clearance hole (ISO 273): close 4.3, normal 4.5, loose 4.8 mm (L1: fine, medium and coarse series (albany-clearance, wikipedia-de-clearance)).

Drawing

As a PDF: CC-DIN1587-SZ-M4.pdf.

Goes with the M4 acorn nut

• Spanner: 7 mm, the hexagon's nominal width across flats (s) in the table above.
• ISO 4762 socket head cap screw in 10 lengths from 6 to 40 mm, the same size as this M4 acorn nut: M4 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 9 lengths from 8 to 40 mm, the same size as this M4 acorn nut: M4 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 7089 flat washer, the same size as this M4 acorn nut: M4 Flat Washer (Plain Washer), ISO 7089

The M4 acorn nut beside the M5

The M4 is the smallest of the 4 DIN 1587 acorn nuts published here, from M4 to M8.

• Thread pitch (P): 0.7 mm on the M4 acorn nut, against 0.8 mm on the M5.
• Dome diameter (dk): up to 6.5 mm on the M4 acorn nut, against up to 7.5 mm on the M5.
• Overall height (h): 8 mm on the M4 acorn nut, against 10 mm on the M5.
• Hex height (m): 2.9 to 3.2 mm on the M4 acorn nut, against 3.7 to 4 mm on the M5.
• Wrenching height (mw): at least 2.32 mm on the M4 acorn nut, against at least 2.96 mm on the M5.
• Width across flats (s): 7 mm on the M4 acorn nut, against 8 mm on the M5.
• Width across corners (e): at least 7.66 mm on the M4 acorn nut, against at least 8.79 mm on the M5.
• Dome radius (r): 3.25 mm (reference) on the M4 acorn nut, against 3.75 mm (reference) on the M5.

Other sizes

• One size larger: M5 Acorn Nut (Cap Nut), DIN 1587, 8 mm across flats.

Documents

• CC-DIN1587-DS-M4.pdf: M4 datasheet: values with levels, sources
• CC-DIN1587-SZ-M4.pdf: M4 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

albany-clearance, amesweb-tap-drill, fasten-it-din1587, fasteners-eu-din1587, fasteners-eu-din1587-drawing, iso4753-2011-sample, rule-basic-minor, rule-iso4759-1-nut-height, rule-tap-drill, schrauben-lexikon-din1587, wikipedia-de-clearance, wikipedia-iso261. Full citations: the method page and this size's datasheet.

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