M3 Large Flat Washer (Fender Washer), DIN 9021

The M3 large flat washer (DIN 9021) is 0.8 mm thick, with a 3.2 mm hole and an outside diameter of 9 mm. It sits under M3 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: M3 washer
• Model id: din9021-m3
• Standard: DIN 9021:1990 · size M3

Files

Part key	Simplified
din9021-m3	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d1	Inside diameter		3.2	3.38	3.2	nominal	L1
d2	Outside diameter	8.64	9		9	nominal	L1
h	Thickness	0.7	0.8	0.9	0.8	nominal	L1

Drawing

As a PDF: CC-DIN9021-SZ-M3.pdf.

Goes with the M3 large flat washer

• ISO 4762 socket head cap screw in 9 lengths from 5 to 30 mm, the same size as this M3 large 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 large flat washer: M3 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 4032 hex nut, the same size as this M3 large flat washer: M3 Hex Nut (Hexagon Nut), ISO 4032 / DIN 934

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

The M3 is number 2, counting from the smallest, of the 6 DIN 9021 large flat washers published here, from M2.5 to M8.

• Inside diameter (d1): 3.2 mm on the M3 large flat washer, against 2.7 mm on the M2.5 and 4.3 mm on the M4.
• Outside diameter (d2): 9 mm on the M3 large flat washer, against 8 mm on the M2.5 and 12 mm on the M4.
• Thickness (h): 0.8 mm on the M3 large flat washer, against 0.8 mm on the M2.5 and 1 mm on the M4.

Other sizes

• One size smaller: M2.5 Large Flat Washer (Fender Washer), DIN 9021, 2.7 mm hole, 8 mm OD.
• One size larger: M4 Large Flat Washer (Fender Washer), DIN 9021, 4.3 mm hole, 12 mm OD.

Documents

• CC-DIN9021-DS-M3.pdf: M3 datasheet: values with levels, sources
• CC-DIN9021-SZ-M3.pdf: M3 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

fasten-it-din9021, fasteners-eu-din9021, jcfasteners-din9021. Full citations: the method page and this size's datasheet.

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