M5 Acorn Nut (Cap Nut), DIN 1587

The M5 acorn nut (DIN 1587) is 8 mm across the flats and 10 mm high. The thread is M5 × 0.8; the files are simplified and threaded STEP files.

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

• Also searched as: M5 acorn nut
• Model id: din1587-m5
• Standard: DIN 1587:2000 · thread M5 × 0.8, ISO metric coarse, right hand

Files

Part key	Simplified	Threaded
din1587-m5	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
P	Thread pitch		0.8		0.8	nominal	L1
dk	Dome diameter			7.5	7.5	single limit (max), modeled at the limit	L1
h	Overall height	9.64	10	10	10	nominal	L1
m	Hex height	3.7		4	3.85	midpoint of min–max	L1
mw	Wrenching height	2.96			2.96	single limit (min), modeled at the limit	L0 (min: one source)
s	Width across flats	7.78	8	8	8	nominal	L1
e	Width across corners	8.79			8.79	single limit (min), modeled at the limit	L1
r	Dome radius		3.75 ref		3.75	reference value	L1
t	Bore depth	7.21		7.79	7.5	midpoint of min–max	L1
x	Thread run-out			1.6	1.6	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	5		5.75	5.375	midpoint of min–max	L0 (min, max: one source)
dw	Bearing face diameter	6.9			6.9	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		0.8		0.8	nominal	L1
tap_drill	Tap drill diameter		4.2		4.2	nominal	L1
d1	Basic minor diameter		4.1339744		4.1339744	nominal	L1
ch_angle	Chamfered end angle			50	50	single limit (max), modeled at the limit	L2
dh_fine	Clearance hole, fine series		5.3		5.3	nominal	L1
dh_medium	Clearance hole, medium series		5.5		5.5	nominal	L1
dh_coarse	Clearance hole, coarse series		5.8		5.8	nominal	L1

Thread and holes

• Tap drill: 4.2 mm (method: d − P), L1, sources amesweb-tap-drill, rule-tap-drill.
• Clearance hole (ISO 273): close 5.3, normal 5.5, loose 5.8 mm (L1: fine, medium and coarse series (albany-clearance, wikipedia-de-clearance)).

Drawing

As a PDF: CC-DIN1587-SZ-M5.pdf.

Goes with the M5 acorn nut

• Spanner: 8 mm, the hexagon's nominal width across flats (s) in the table above.
• ISO 4762 socket head cap screw in 11 lengths from 8 to 50 mm, the same size as this M5 acorn nut: M5 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 10 lengths from 10 to 50 mm, the same size as this M5 acorn nut: M5 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 7089 flat washer, the same size as this M5 acorn nut: M5 Flat Washer (Plain Washer), ISO 7089

The M5 acorn nut beside the M4 and the M6

The M5 is number 2, counting from the smallest, of the 4 DIN 1587 acorn nuts published here, from M4 to M8.

• Thread pitch (P): 0.8 mm on the M5 acorn nut, against 0.7 mm on the M4 and 1 mm on the M6.
• Dome diameter (dk): up to 7.5 mm on the M5 acorn nut, against up to 6.5 mm on the M4 and up to 9.5 mm on the M6.
• Overall height (h): 10 mm on the M5 acorn nut, against 8 mm on the M4 and 12 mm on the M6.
• Hex height (m): 3.7 to 4 mm on the M5 acorn nut, against 2.9 to 3.2 mm on the M4 and 4.7 to 5 mm on the M6.
• Wrenching height (mw): at least 2.96 mm on the M5 acorn nut, against at least 2.32 mm on the M4 and at least 3.76 mm on the M6.
• Width across flats (s): 8 mm on the M5 acorn nut, against 7 mm on the M4 and 10 mm on the M6.
• Width across corners (e): at least 8.79 mm on the M5 acorn nut, against at least 7.66 mm on the M4 and at least 11.05 mm on the M6.
• Dome radius (r): 3.75 mm (reference) on the M5 acorn nut, against 3.25 mm (reference) on the M4 and 4.75 mm (reference) on the M6.

Other sizes

• One size smaller: M4 Acorn Nut (Cap Nut), DIN 1587, 7 mm across flats.
• One size larger: M6 Acorn Nut (Cap Nut), DIN 1587, 10 mm across flats.

Documents

• CC-DIN1587-DS-M5.pdf: M5 datasheet: values with levels, sources
• CC-DIN1587-SZ-M5.pdf: M5 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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