M6 Square Nut (Chamfered Square Nut), DIN 557

The M6 square nut (DIN 557) is 10 mm across the flats and 5 mm high. The thread is M6 × 1; the files are simplified and threaded STEP files.

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

• Also searched as: M6 square nut
• Model id: din557-m6
• Standard: DIN 557:1994 · thread M6 × 1, ISO metric coarse, right hand

Files

Part key	Simplified	Threaded
din557-m6	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
P	Thread pitch		1		1	nominal	L1
s	Width across flats	9.64	10	10	9.82	midpoint of min–max	L1
m	Nut height	4.52	5	5	4.76	midpoint of min–max	L1
e	Width across corners	12.53		14.1	13.315	midpoint of min–max	L1
dw	Bearing face diameter	8.7			8.7	single limit (min), modeled at the limit	L1
mw	Height at the corners	3.2			3.2	single limit (min), modeled at the limit	L1
beta	Chamfer angle	15		30	22.5	midpoint of min–max	L0 (min, max: one source)
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-DIN557-SZ-M6.pdf.

Goes with the M6 square nut

• Spanner: 10 mm, the hexagon's nominal width across flats (s) in the table above.
• ISO 4762 socket head cap screw in 12 lengths from 10 to 60 mm, the same size as this M6 square nut: M6 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 11 lengths from 12 to 60 mm, the same size as this M6 square nut: M6 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 7089 flat washer, the same size as this M6 square nut: M6 Flat Washer (Plain Washer), ISO 7089

The M6 square nut beside the M5 and the M8

The M6 is number 2, counting from the smallest, of the 3 DIN 557 square nuts published here, from M5 to M8.

• Thread pitch (P): 1 mm on the M6 square nut, against 0.8 mm on the M5 and 1.25 mm on the M8.
• Width across flats (s): 10 mm on the M6 square nut, against 8 mm on the M5 and 13 mm on the M8.
• Nut height (m): 5 mm on the M6 square nut, against 4 mm on the M5 and 6.5 mm on the M8.
• Width across corners (e): 12.53 to 14.1 mm on the M6 square nut, against 9.93 to 11.3 mm on the M5 and 16.34 to 18.4 mm on the M8.
• Bearing face diameter (dw): at least 8.7 mm on the M6 square nut, against at least 6.7 mm on the M5 and at least 11.5 mm on the M8.
• Height at the corners (mw): at least 3.2 mm on the M6 square nut, against at least 2.5 mm on the M5 and at least 4.1 mm on the M8.
• Chamfer angle (beta): 15 to 30° on the M6 square nut, the same on the M5 and the M8.
• Tap drill diameter (tap_drill): 5 mm on the M6 square nut, against 4.2 mm on the M5 and 6.75 mm on the M8.

Other sizes

• One size smaller: M5 Square Nut (Chamfered Square Nut), DIN 557, 8 mm across flats.
• One size larger: M8 Square Nut (Chamfered Square Nut), DIN 557, 13 mm across flats.

Documents

• CC-DIN557-DS-M6.pdf: M6 datasheet: values with levels, sources
• CC-DIN557-SZ-M6.pdf: M6 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-din557, fasteners-eu-din557, fasteners-eu-din557-drawing, iso4753-2011-sample, krepcom-din557, rule-basic-minor, rule-tap-drill, wikipedia-de-clearance, wikipedia-iso261. Full citations: the method page and this size's datasheet.

Found an error? Use the feedback section on this page.