M4 Flat Washer (Plain Washer), ISO 7089

The M4 flat washer (ISO 7089) is 0.8 mm thick, with a 4.3 mm hole and an outside diameter of 9 mm. It sits under M4 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: M4 washer
• Model id: iso7089-m4
• Standard: ISO 7089:2000 · size M4

Files

Part key	Simplified
iso7089-m4	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d1	Inside diameter	4.3	4.3	4.48	4.3	nominal	L1
d2	Outside diameter	8.64	9	9	9	nominal	L1
h	Thickness	0.7	0.8	0.9	0.8	nominal	L1

Drawing

As a PDF: CC-ISO7089-SZ-M4.pdf.

Goes with the M4 flat washer

• ISO 4762 socket head cap screw in 10 lengths from 6 to 40 mm, the same size as this M4 flat washer: M4 Socket Head Cap Screw (Allen Bolt), ISO 4762 / DIN 912
• ISO 4017 hex head screw in 9 lengths from 8 to 40 mm, the same size as this M4 flat washer: M4 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 4032 hex nut, the same size as this M4 flat washer: M4 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: 0.308 kg

The M4 flat washer beside the M3 and the M5

The M4 is number 4, counting from the smallest, of the 7 ISO 7089 flat washers published here, from M2 to M8.

• Inside diameter (d1): 4.3 mm on the M4 flat washer, against 3.2 mm on the M3 and 5.3 mm on the M5.
• Outside diameter (d2): 9 mm on the M4 flat washer, against 7 mm on the M3 and 10 mm on the M5.
• Thickness (h): 0.8 mm on the M4 flat washer, against 0.5 mm on the M3 and 1 mm on the M5.

Other sizes

• One size smaller: M3 Flat Washer (Plain Washer), ISO 7089, 3.2 mm hole, 7 mm OD.
• One size larger: M5 Flat Washer (Plain Washer), ISO 7089, 5.3 mm hole, 10 mm OD.

Documents

• CC-ISO7089-DS-M4.pdf: M4 datasheet: values with levels, sources
• CC-ISO7089-SZ-M4.pdf: M4 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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