M3 Flat Washer (Plain Washer), ISO 7089

Made for M3 screws, this flat washer (ISO 7089) has a 3.2 mm hole and is 7 mm across, 0.5 mm thick. Download it as simplified STEP files.

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

• Also searched as: M3 washer
• Model id: iso7089-m3
• Standard: ISO 7089:2000 · size M3

Files

Part key	Simplified
iso7089-m3	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d1	Inside diameter	3.2	3.2	3.38	3.2	nominal	L1
d2	Outside diameter	6.64	7	7	7	nominal	L1
h	Thickness	0.45	0.5	0.55	0.5	nominal	L1

Drawing

As a PDF: CC-ISO7089-SZ-M3.pdf.

Goes with the M3 flat washer

• ISO 4762 socket head cap screw in 9 lengths from 5 to 30 mm, the same size as this M3 flat washer: M3 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 8 lengths from 6 to 30 mm, the same size as this M3 flat washer: M3 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 4032 hex nut, the same size as this M3 flat washer: M3 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: 0.119 kg

The M3 flat washer beside the M2.5 and the M4

The M3 is number 3, counting from the smallest, of the 7 ISO 7089 flat washers published here, from M2 to M8.

• Inside diameter (d1): 3.2 mm on the M3 flat washer, against 2.7 mm on the M2.5 and 4.3 mm on the M4.
• Outside diameter (d2): 7 mm on the M3 flat washer, against 6 mm on the M2.5 and 9 mm on the M4.
• Thickness (h): 0.5 mm on the M3 flat washer, against 0.5 mm on the M2.5 and 0.8 mm on the M4.

Other sizes

• One size smaller: M2.5 Flat Washer (Plain Washer), ISO 7089, 2.7 mm hole, 6 mm OD.
• One size larger: M4 Flat Washer (Plain Washer), ISO 7089, 4.3 mm hole, 9 mm OD.

Documents

• CC-ISO7089-DS-M3.pdf: M3 datasheet: values with levels, sources
• CC-ISO7089-SZ-M3.pdf: M3 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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