M2.5 Flat Washer (Plain Washer), ISO 7089

The M2.5 flat washer (ISO 7089) is 0.5 mm thick, with a 2.7 mm hole and an outside diameter of 6 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: iso7089-m2-5
• Standard: ISO 7089:2000 · size M2.5

Files

Part key	Simplified
iso7089-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	5.7	6	6	6	nominal	L1
h	Thickness	0.45	0.5	0.55	0.5	nominal	L1

Drawing

As a PDF: CC-ISO7089-SZ-M2.5.pdf.

Goes with the M2.5 flat washer

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

Approximate mass

Approximate mass of 1000 washers, from fasten.it's DIN EN ISO 7089 table (fasten-it-iso7089), column “weight in Kg x 1000 pcs (ρ=7,85 kg/dm3)”.

• mass per 1000: 0.088 kg

The M2.5 flat washer beside the M2 and the M3

The M2.5 is number 2, counting from the smallest, of the 7 ISO 7089 flat washers published here, from M2 to M8.

• Inside diameter (d1): 2.7 mm on the M2.5 flat washer, against 2.2 mm on the M2 and 3.2 mm on the M3.
• Outside diameter (d2): 6 mm on the M2.5 flat washer, against 5 mm on the M2 and 7 mm on the M3.
• Thickness (h): 0.5 mm on the M2.5 flat washer, against 0.3 mm on the M2 and 0.5 mm on the M3.

Other sizes

• One size smaller: M2 Flat Washer (Plain Washer), ISO 7089, 2.2 mm hole, 5 mm OD.
• One size larger: M3 Flat Washer (Plain Washer), ISO 7089, 3.2 mm hole, 7 mm OD.

Documents

• CC-ISO7089-DS-M2.5.pdf: M2.5 datasheet: values with levels, sources
• CC-ISO7089-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

amesweb-iso7089, fasten-it-iso7089, westfield-iso7089. Full citations: the method page and this size's datasheet.

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