M8 Thin Hex Nut (Jam Nut), ISO 4035

Across the flats an M8 thin hex nut (ISO 4035) measures 12.73 to 13 mm, and it stands 3.7 to 4 mm tall on the M8 × 1.25 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: M8 nut
• Model id: iso4035-m8
• Standard: ISO 4035:2012 · thread M8 × 1.25, ISO metric coarse, right hand

Files

Part key	Simplified	Threaded
iso4035-m8	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
P	Thread pitch		1.25		1.25	nominal	L2
da	Countersink diameter	8		8.75	8.375	midpoint of min–max	L2
dw	Bearing face diameter	11.6			11.6	single limit (min), modeled at the limit	L2
e	Width across corners	14.38			14.38	single limit (min), modeled at the limit	L2
m	Nut height	3.7		4	3.85	midpoint of min–max	L2
mw	Wrenching height	3			3	single limit (min), modeled at the limit	L2
s	Width across flats	12.73		13	12.865	midpoint of min–max	L2
beta	Chamfer angle	15		30	22.5	midpoint of min–max	L2
theta	Countersink angle	110		120	115	midpoint of min–max	L2
P	Coarse thread pitch		1.25		1.25	nominal	L1
tap_drill	Tap drill diameter		6.75		6.75	nominal	L1
d1	Basic minor diameter		6.646835		6.646835	nominal	L1
ch_angle	Chamfered end angle			50	50	single limit (max), modeled at the limit	L2
dh_fine	Clearance hole, fine series		8.4		8.4	nominal	L1
dh_medium	Clearance hole, medium series		9		9	nominal	L1
dh_coarse	Clearance hole, coarse series		10		10	nominal	L1

Thread and holes

• Tap drill: 6.75 mm (method: d − P), L1, sources amesweb-tap-drill, rule-tap-drill.
• Clearance hole (ISO 273): close 8.4, normal 9, loose 10 mm (L1: fine, medium and coarse series (albany-clearance, wikipedia-de-clearance)).

Drawing

As a PDF: CC-ISO4035-SZ-M8.pdf.

Goes with the M8 thin hex nut

• Spanner: 13 mm, the hexagon's maximum width across flats (s) in the table above.
• ISO 4762 socket head cap screw in 14 lengths from 12 to 80 mm, the same size as this M8 thin hex nut: M8 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 13 lengths from 16 to 80 mm, the same size as this M8 thin hex nut: M8 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 7089 flat washer, the same size as this M8 thin hex nut: M8 Flat Washer (Plain Washer), ISO 7089

The M8 thin hex nut beside the M6

The M8 is the largest of the 7 ISO 4035 thin hex nuts published here, from M2 to M8.

• Thread pitch (P): 1.25 mm on the M8 thin hex nut, against 1 mm on the M6.
• Countersink diameter (da): 8 to 8.75 mm on the M8 thin hex nut, against 6 to 6.75 mm on the M6.
• Bearing face diameter (dw): at least 11.6 mm on the M8 thin hex nut, against at least 8.9 mm on the M6.
• Width across corners (e): at least 14.38 mm on the M8 thin hex nut, against at least 11.05 mm on the M6.
• Nut height (m): 3.7 to 4 mm on the M8 thin hex nut, against 2.9 to 3.2 mm on the M6.
• Wrenching height (mw): at least 3 mm on the M8 thin hex nut, against at least 2.3 mm on the M6.
• Width across flats (s): 12.73 to 13 mm on the M8 thin hex nut, against 9.78 to 10 mm on the M6.
• Chamfer angle (beta): 15 to 30° on the M8 thin hex nut, the same on the M6.

Other sizes

• One size smaller: M6 Thin Hex Nut (Jam Nut), ISO 4035, 9.78 to 10 mm across flats.

Documents

• CC-ISO4035-DS-M8.pdf: M8 datasheet: values with levels, sources
• CC-ISO4035-SZ-M8.pdf: M8 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, boltport-iso4035, engineersedge-iso4035, fasten-it-iso4035, fuller-iso4035, iso4035-2012-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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