M2.5 Serrated Lock Washer, Form A (External Teeth), DIN 6798

The M2.5 serrated lock washer (DIN 6798, form A, external teeth) is 0.4 mm thick, with a 2.7 mm hole and an outside diameter of 5.5 mm. It has 9 teeth. 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: din6798-a-m2-5
• Standard: DIN 6798:1988 · size M2.5

Files

Part key	Simplified
din6798-a-m2-5	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d1	Inside diameter	2.7	2.7	2.84	2.7	nominal	L1
d2	Outside diameter, forms A and J	5.2	5.5	5.5	5.5	nominal	L1
s1	Sheet thickness, forms A and J		0.4		0.4	nominal	L1
teeth_A	Number of teeth, form A	9			9	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-DIN6798-SZ-M2.5.pdf.

Goes with the M2.5 serrated lock washer

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

The M2.5 form A serrated lock washer beside the M2 and the M3

The M2.5 is number 2, counting from the smallest, of the 7 DIN 6798 serrated lock washers published here, from M2 to M8.

• Inside diameter (d1): 2.7 mm on the M2.5 form A serrated lock washer, against 2.2 mm on the M2 and 3.2 mm on the M3.
• Outside diameter (d2): 5.5 mm on the M2.5 form A serrated lock washer, against 4.5 mm on the M2 and 6 mm on the M3.
• Sheet thickness (s1): 0.4 mm on the M2.5 form A serrated lock washer, against 0.3 mm on the M2 and 0.4 mm on the M3.
• Number of teeth (teeth_A): at least 9 on the M2.5 form A serrated lock washer, the same on the M2 and the M3.

The M2.5 form A serrated lock washer in its other forms

• M2.5 Serrated Lock Washer, Form J (Internal Teeth), DIN 6798: number of teeth at least 7.
• M2.5 Serrated Lock Washer, Form V (Countersunk), DIN 6798: outside diameter 5.1 mm, sheet thickness 0.2 mm, number of teeth at least 10.

Other sizes

• One size smaller: M2 Serrated Lock Washer, Form A (External Teeth), DIN 6798, 2.2 mm hole, 4.5 mm OD.
• One size larger: M3 Serrated Lock Washer, Form A (External Teeth), DIN 6798, 3.2 mm hole, 6 mm OD.

Documents

• CC-DIN6798-DS-M2.5.pdf: M2.5 datasheet: values with levels, sources
• CC-DIN6798-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

engineersedge-din6798, fasten-it-din6798, globalfastener-din6798-a, globalfastener-din6798-j, globalfastener-din6798-v. Full citations: the method page and this size's datasheet.

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