M2 Hex Nut (Hexagon Nut), ISO 4032 / DIN 934

Across the flats an M2 hex nut (ISO 4032) measures 4 mm, and it stands 1.35 to 1.6 mm tall on the M2 × 0.4 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: M2 nut
• Equivalent standards: DIN 934 (as listed by fasteners.eu); the values here are ISO 4032's.
• Model id: iso4032-m2
• Standard: ISO 4032:2012 · thread M2 × 0.4, ISO metric coarse, right hand

Files

Part key	Simplified	Threaded
iso4032-m2	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
P	Thread pitch		0.4		0.4	nominal	L2
c	Washer face height	0.1		0.2	0.15	midpoint of min–max	L2
da	Countersink diameter	2		2.3	2.15	midpoint of min–max	L2
dw	Bearing face diameter	3.1			3.1	single limit (min), modeled at the limit	L2
e	Width across corners	4.32			4.32	single limit (min), modeled at the limit	L2
m	Nut height	1.35		1.6	1.475	midpoint of min–max	L2
mw	Wrenching height	1.1			1.1	single limit (min), modeled at the limit	L2
s	Width across flats	3.82	4	4	3.91	midpoint of min–max	L2
beta	Chamfer angle	15		30	22.5	midpoint of min–max	L2
theta	Countersink angle	90		120	105	midpoint of min–max	L2
P	Coarse thread pitch		0.4		0.4	nominal	L1
tap_drill	Tap drill diameter		1.6		1.6	nominal	L1
d1	Basic minor diameter		1.5669872		1.5669872	nominal	L1
ch_angle	Chamfered end angle			50	50	single limit (max), modeled at the limit	L2
dh_fine	Clearance hole, fine series		2.2		2.2	nominal	L1
dh_medium	Clearance hole, medium series		2.4		2.4	nominal	L1
dh_coarse	Clearance hole, coarse series		2.6		2.6	nominal	L1

Thread and holes

• Tap drill: 1.6 mm (method: d − P), L1, sources amesweb-tap-drill, rule-tap-drill.
• Clearance hole (ISO 273): close 2.2, normal 2.4, loose 2.6 mm (L1: fine, medium and coarse series (albany-clearance, wikipedia-de-clearance)).

Drawing

As a PDF: CC-ISO4032-SZ-M2.pdf.

Goes with the M2 hex nut

• Spanner: 4 mm, the hexagon's nominal width across flats (s) in the table above.
• ISO 4762 socket head cap screw in 9 lengths from 3 to 20 mm, the same size as this M2 hex nut: M2 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 8 lengths from 4 to 20 mm, the same size as this M2 hex nut: M2 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 7089 flat washer, the same size as this M2 hex nut: M2 Flat Washer (Plain Washer), ISO 7089

The M2 hex nut beside the M2.5

The M2 is the smallest of the 7 ISO 4032 hex nuts published here, from M2 to M8.

• Thread pitch (P): 0.4 mm on the M2 hex nut, against 0.45 mm on the M2.5.
• Washer face height (c): 0.1 to 0.2 mm on the M2 hex nut, against 0.1 to 0.3 mm on the M2.5.
• Countersink diameter (da): 2 to 2.3 mm on the M2 hex nut, against 2.5 to 2.9 mm on the M2.5.
• Bearing face diameter (dw): at least 3.1 mm on the M2 hex nut, against at least 4.1 mm on the M2.5.
• Width across corners (e): at least 4.32 mm on the M2 hex nut, against at least 5.45 mm on the M2.5.
• Nut height (m): 1.35 to 1.6 mm on the M2 hex nut, against 1.75 to 2 mm on the M2.5.
• Wrenching height (mw): at least 1.1 mm on the M2 hex nut, against at least 1.4 mm on the M2.5.
• Width across flats (s): 4 mm on the M2 hex nut, against 5 mm on the M2.5.

Other sizes

• One size larger: M2.5 Hex Nut (Hexagon Nut), ISO 4032 / DIN 934, 5 mm across flats.

Documents

• CC-ISO4032-DS-M2.pdf: M2 datasheet: values with levels, sources
• CC-ISO4032-SZ-M2.pdf: M2 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

albany-clearance, amesweb-iso4032, amesweb-tap-drill, fasten-it-iso4032, fasteners-eu-iso4032, iso4032-2012-sample, iso4753-2011-sample, 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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