M2.5 Thin Square Nut (Square Thin Nut), DIN 562

The M2.5 thin square nut (DIN 562) is 5 mm across the flats and 1.6 mm high. The thread is M2.5 × 0.45; the files are simplified and threaded STEP files.

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

• Also searched as: M2.5 thin square nut
• Model id: din562-m2-5
• Standard: DIN 562:2013 · thread M2.5 × 0.45, ISO metric coarse, right hand

Files

Part key	Simplified	Threaded
din562-m2-5	STEP	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
s	Width across flats	4.7	5	5	4.85	midpoint of min–max	L1
m	Nut height	1.2	1.6	1.6	1.4	midpoint of min–max	L1
e	Width across corners	6.3			6.3	single limit (min), modeled at the limit	L1
P	Coarse thread pitch		0.45		0.45	nominal	L1
tap_drill	Tap drill diameter		2.05		2.05	nominal	L1
d1	Basic minor diameter		2.0128606		2.0128606	nominal	L1
ch_angle	Chamfered end angle			50	50	single limit (max), modeled at the limit	L2
dh_fine	Clearance hole, fine series		2.7		2.7	nominal	L1
dh_medium	Clearance hole, medium series		2.9		2.9	nominal	L1
dh_coarse	Clearance hole, coarse series		3.1		3.1	nominal	L1

Thread and holes

• Tap drill: 2.05 mm (method: d − P), L1, sources amesweb-tap-drill, rule-tap-drill.
• Clearance hole (ISO 273): close 2.7, normal 2.9, loose 3.1 mm (L1: fine, medium and coarse series (albany-clearance, wikipedia-de-clearance)).

Drawing

As a PDF: CC-DIN562-SZ-M2.5.pdf.

Goes with the M2.5 thin square nut

• Spanner: 5 mm, the hexagon's nominal width across flats (s) in the table above.
• ISO 4762 socket head cap screw in 9 lengths from 4 to 25 mm, the same size as this M2.5 thin square nut: M2.5 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 8 lengths from 5 to 25 mm, the same size as this M2.5 thin square nut: M2.5 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 7089 flat washer, the same size as this M2.5 thin square nut: M2.5 Flat Washer (Plain Washer), ISO 7089

The M2.5 thin square nut beside the M2 and the M3

The M2.5 is number 2, counting from the smallest, of the 7 DIN 562 thin square nuts published here, from M2 to M8.

• Width across flats (s): 5 mm on the M2.5 thin square nut, against 4 mm on the M2 and 5.5 mm on the M3.
• Nut height (m): 1.6 mm on the M2.5 thin square nut, against 1.2 mm on the M2 and 1.8 mm on the M3.
• Width across corners (e): at least 6.3 mm on the M2.5 thin square nut, against at least 5 mm on the M2 and at least 7 mm on the M3.
• Coarse thread pitch (P): 0.45 mm on the M2.5 thin square nut, against 0.4 mm on the M2 and 0.5 mm on the M3.
• Tap drill diameter (tap_drill): 2.05 mm on the M2.5 thin square nut, against 1.6 mm on the M2 and 2.5 mm on the M3.
• Basic minor diameter (d1): 2.0128606 mm on the M2.5 thin square nut, against 1.5669872 mm on the M2 and 2.458734 mm on the M3.
• Chamfered end angle (ch_angle): up to 50° on the M2.5 thin square nut, the same on the M2 and the M3.
• Clearance hole, fine series (dh_fine): 2.7 mm on the M2.5 thin square nut, against 2.2 mm on the M2 and 3.2 mm on the M3.

Other sizes

• One size smaller: M2 Thin Square Nut (Square Thin Nut), DIN 562, 4 mm across flats.
• One size larger: M3 Thin Square Nut (Square Thin Nut), DIN 562, 5.5 mm across flats.

Documents

• CC-DIN562-DS-M2.5.pdf: M2.5 datasheet: values with levels, sources
• CC-DIN562-SZ-M2.5.pdf: M2.5 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, cde-din562, fasten-it-din562, fasteners-eu-din562, iso4753-2011-sample, rule-basic-minor, rule-iso4759-1-nut-height-din562, rule-iso4759-1-nut-width-din562, rule-tap-drill, wegertseder-din562, wikipedia-de-clearance, wikipedia-iso261. Full citations: the method page and this size's datasheet.

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