M4 Large Flat Washer (Fender Washer), DIN 9021

Made for M4 screws, this large flat washer (DIN 9021) has a 4.3 mm hole and is 12 mm across, 1 mm thick. Download it as simplified STEP files.

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

• Also searched as: M4 washer
• Model id: din9021-m4
• Standard: DIN 9021:1990 · size M4

Files

Part key	Simplified
din9021-m4	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d1	Inside diameter		4.3	4.48	4.3	nominal	L1
d2	Outside diameter	11.57	12		12	nominal	L1
h	Thickness	0.9	1	1.1	1	nominal	L1

Drawing

As a PDF: CC-DIN9021-SZ-M4.pdf.

Goes with the M4 large flat washer

• ISO 4762 socket head cap screw in 10 lengths from 6 to 40 mm, the same size as this M4 large 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 large flat washer: M4 Hex Head Screw (Hex Bolt), ISO 4017
• ISO 4032 hex nut, the same size as this M4 large flat washer: M4 Hex Nut (Hexagon Nut), ISO 4032 / DIN 934

The M4 large flat washer beside the M3 and the M5

The M4 is number 3, counting from the smallest, of the 6 DIN 9021 large flat washers published here, from M2.5 to M8.

• Inside diameter (d1): 4.3 mm on the M4 large flat washer, against 3.2 mm on the M3 and 5.3 mm on the M5.
• Outside diameter (d2): 12 mm on the M4 large flat washer, against 9 mm on the M3 and 15 mm on the M5.
• Thickness (h): 1 mm on the M4 large flat washer, against 0.8 mm on the M3 and 1.2 mm on the M5.

Other sizes

• One size smaller: M3 Large Flat Washer (Fender Washer), DIN 9021, 3.2 mm hole, 9 mm OD.
• One size larger: M5 Large Flat Washer (Fender Washer), DIN 9021, 5.3 mm hole, 15 mm OD.

Documents

• CC-DIN9021-DS-M4.pdf: M4 datasheet: values with levels, sources
• CC-DIN9021-SZ-M4.pdf: M4 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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