M2.5 Split Lock Washer (Spring Washer), DIN 127

The M2.5 split lock washer (DIN 127) is 1.2 to 1.4 mm thick, with a 2.6 to 2.9 mm hole and an outside diameter of up to 5.1 mm. It sits under M2.5 screw heads and nuts; here as simplified STEP files.

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

• Also searched as: M2.5 washer
• Model id: din127-b-m2-5
• Standard: DIN 127:1987 · size M2.5

Files

Part key	Simplified
din127-b-m2-5	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d1	Inside diameter	2.6		2.9	2.75	midpoint of min–max	L1
d2	Outside diameter			5.1	5.1	single limit (max), modeled at the limit	L1
b	Section width	0.9	1	1.1	1	nominal	L1
s	Section thickness	0.5	0.6	0.7	0.6	nominal	L1
r	Section corner radius		0.1		0.1	nominal	L1
h	Free height	1.2		1.4	1.3	midpoint of min–max	L1

Drawing

As a PDF: CC-DIN127-SZ-M2.5.pdf.

Goes with the M2.5 split lock washer

• ISO 4762 socket head cap screw in 9 lengths from 4 to 25 mm, the same size as this M2.5 split lock washer: 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 split lock washer: M2.5 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 4032 hex nut, the same size as this M2.5 split lock washer: M2.5 Hex Nut (Hexagon Nut), ISO 4032 / DIN 934

The M2.5 split lock washer beside the M2 and the M3

The M2.5 is number 2, counting from the smallest, of the 7 DIN 127 split lock washers published here, from M2 to M8.

• Inside diameter (d1): 2.6 to 2.9 mm on the M2.5 split lock washer, against 2.1 to 2.4 mm on the M2 and 3.1 to 3.4 mm on the M3.
• Outside diameter (d2): up to 5.1 mm on the M2.5 split lock washer, against up to 4.4 mm on the M2 and up to 6.2 mm on the M3.
• Section width (b): 1 mm on the M2.5 split lock washer, against 0.9 mm on the M2 and 1.3 mm on the M3.
• Section thickness (s): 0.6 mm on the M2.5 split lock washer, against 0.5 mm on the M2 and 0.8 mm on the M3.
• Section corner radius (r): 0.1 mm on the M2.5 split lock washer, against 0.1 mm on the M2 and 0.2 mm on the M3.
• Free height (h): 1.2 to 1.4 mm on the M2.5 split lock washer, against 1 to 1.2 mm on the M2 and 1.6 to 1.9 mm on the M3.

Other sizes

• One size smaller: M2 Split Lock Washer (Spring Washer), DIN 127, 2.1 to 2.4 mm hole, up to 4.4 mm OD.
• One size larger: M3 Split Lock Washer (Spring Washer), DIN 127, 3.1 to 3.4 mm hole, up to 6.2 mm OD.

Documents

• CC-DIN127-DS-M2.5.pdf: M2.5 datasheet: values with levels, sources
• CC-DIN127-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

fasten-it-din127, fasteners-eu-din127, globalfastener-din127. Full citations: the method page and this size's datasheet.

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