DIN 9021 Flat Washers | McMaster-Carr

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DIN

DIN 9021

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Warning: Products have one, but not necessarily all, of the selected characteristics.

	System of Measurement System of Measurement

Metric

	For Screw Size For Screw Size

	Material Material

Stainless Steel

Steel

	Finish Finish

Black Oxide

Corrosion-Resistant-Coated

Zinc Plated

	OD OD

	ID ID

	Washer Type Washer Type

	Flat

	Thickness Thickness

	Hardness Hardness

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Color Color

	Black

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72 Products

About Washers

Zinc-Plated Steel

Black Ultra-Corrosion-Resistant Coated Steel

Stainless Steel

Black-Oxide Stainless Steel

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses. Use them to cover oversized holes, hold heavy fastening loads, or as spacers and levelers.

Zinc-plated steel washers have an outer layer of zinc that prevents the steel from rusting in wet areas. Compared to stainless steel, they're stronger, more wear resistant, and less costly, but not as corrosion resistant. Avoid exposing them to salt water and chemicals. Stainless steel washers are more corrosion resistant than steel washers, and almost as strong. Use them in damp and washdown applications without worrying about rust. 18-8 stainless steel and 17-7 PH stainless steel washers have similar qualities to one another, except 17-7 PH stainless steel washers are stronger. Black-oxide 18-8 stainless steel washers resist corrosion just as well as regular 18-8 stainless steel washers and have a matte-black finish. 316 stainless steel washers stand up to salt water, chlorine solutions, and other chemicals without rusting. Bumax 88 stainless steel washers are the most corrosion resistant washers in our offering. They're commonly used in marine environments and chemical-processing plants.

Washers that meet DIN and ISO specifications, meet international standards for washer dimensions. ISO 8738 is formerly DIN 1440. ISO 7093 is formerly DIN 9021.

For technical drawings and 3-D models, click on a part number.

Zinc-Plated Steel
For Screw Size	ID, mm	OD, mm	Thick., mm	Hardness	Specifications Met	Finish Manufacturer Equivalent	Pkg. Qty.		Pkg.
M2.5	2.7	8.0	0.7-0.9	Rockwell B56	DIN 9021	__	100	000000000	00000
M3	3.2	9.0	0.7-0.9	Rockwell B56	DIN 9021	__	100	000000000	0000
M4	4.3	12.0	0.9-1.1	Rockwell B56	DIN 9021	__	100	000000000	0000
M5	5.3	15.0	1.0-1.4	Rockwell B56	DIN 9021	__	100	000000000	0000
M6	6.4	18.0	1.4-1.8	Rockwell B56	DIN 9021	__	100	000000000	0000
M8	8.4	24.0	1.8-2.2	Rockwell B56	DIN 9021	__	100	000000000	00000
M10	10.5	30.0	2.3-2.7	Rockwell B56	DIN 9021	__	50	000000000	00000
M12	13.0	37.0	2.7-3.3	Rockwell B56	DIN 9021	__	25	000000000	00000
M14	15.0	44.0	2.7-3.3	Rockwell B75	DIN 9021	__	25	000000000	00000
M16	17.0	50.0	2.7-3.3	Rockwell B56	DIN 9021	__	25	000000000	00000
M18	20.0	56.0	3.4-4.6	Rockwell B56	DIN 9021	__	10	000000000	00000
M20	22.0	60.0	3.4-4.6	Rockwell B56	DIN 9021	__	10	000000000	00000
M24	26.8	72.0	4.0-6.0	Rockwell B53	DIN 9021	__	1	000000000	0000
Black Corrosion-Resistant-Coated Steel
M4	4.3	12.0	0.9-1.1	Rockwell B56	DIN 9021, ISO 7093	Black Luster	5	000000000	0000
M5	5.3	15.0	1.0-1.4	Rockwell B56	DIN 9021, ISO 7093	Black Luster	5	000000000	0000
M6	6.4	18.0	1.4-1.8	Rockwell B56	DIN 9021, ISO 7093	Black Luster	5	000000000	0000
M8	8.4	24.0	1.8-2.2	Rockwell B56	DIN 9021, ISO 7093	Black Luster	5	000000000	0000
M10	10.5	30.0	2.3-2.7	Rockwell B56	DIN 9021, ISO 7093	Black Luster	5	000000000	00000
M12	13.0	37.0	2.7-3.3	Rockwell B56	DIN 9021, ISO 7093	Black Luster	1	000000000	0000
M14	15.0	44.0	2.7-3.3	Rockwell B56	DIN 9021, ISO 7093	Black Luster	1	000000000	0000
18-8 Stainless Steel
M2	2.2	7.0	0.6-1.0	Rockwell B75	DIN 9021	__	100	000000000	0000
M2.5	2.7	8.0	0.7-0.9	Rockwell B52	DIN 9021	__	100	000000000	0000
M3	3.2	9.0	0.7-0.9	Rockwell B52	DIN 9021	__	100	000000000	0000
M4	4.3	12.0	0.9-1.1	Rockwell B52	DIN 9021	__	100	000000000	0000
M5	5.3	15.0	1.0-1.4	Rockwell B52	DIN 9021	__	100	000000000	00000
M6	6.4	18.0	1.4-1.8	Rockwell B52	DIN 9021	__	50	000000000	00000
M7	7.4	22.0	1.8-2.2	Rockwell B75	DIN 9021	__	25	000000000	0000
M8	8.4	24.0	1.8-2.2	Rockwell B52	DIN 9021	__	25	000000000	00000
M10	10.5	30.0	2.3-2.7	Rockwell B52	DIN 9021	__	10	000000000	0000
M12	13.0	37.0	2.7-3.3	Rockwell B52	DIN 9021	__	10	000000000	00000
M14	15.0	44.0	2.7-3.3	Rockwell B75	DIN 9021	__	1	000000000	0000
M16	17.0	50.0	2.7-3.3	Rockwell B52	DIN 9021	__	5	000000000	00000
M18	20.0	56.0	3.4-4.6	Rockwell B75	DIN 9021	__	1	000000000	0000
M20	22.0	60.0	3.4-4.6	Rockwell B52	DIN 9021	__	1	000000000	0000
M24	26.0	72.0	4.0-6.0	Rockwell B68	DIN 9021	__	1	000000000	0000
17-7 PH Stainless Steel
M2	2.2	7.0	0.6-1.0	Rockwell C40	DIN 9021	__	10	000000000	0000
M3	3.2	9.0	0.7-0.9	Rockwell C40	DIN 9021	__	10	000000000	00000
M6	7.0	13.6	2.7-4.0	Rockwell C40	DIN 9021	__	1	000000000	00000
M8	8.4	22.0	4.5-5.4	Rockwell C40	DIN 9021	__	1	000000000	00000
Black-Oxide 18-8 Stainless Steel
M2	2.2	7.0	0.6-1.0	Rockwell B68	DIN 9021	__	10	000000000	00000
M2.5	2.7	8.0	0.7-0.9	Rockwell B68	DIN 9021	__	10	000000000	00000
M3	3.2	9.0	0.7-0.9	Rockwell B68	DIN 9021	__	10	000000000	00000
M4	4.3	12.0	0.9-1.1	Rockwell B68	DIN 9021	__	10	000000000	00000
M5	5.3	15.0	1.0-1.4	Rockwell B68	DIN 9021	__	10	000000000	00000
M6	6.4	18.0	1.4-1.8	Rockwell B68	DIN 9021	__	10	000000000	00000
M7	7.4	22.0	1.8-2.2	Rockwell B68	DIN 9021	__	10	000000000	00000
M8	8.4	24.0	1.8-2.2	Rockwell B68	DIN 9021	__	5	000000000	0000
M10	10.5	30.0	2.3-2.7	Rockwell B68	DIN 9021	__	5	000000000	00000
M12	13.0	37.0	2.7-3.3	Rockwell B68	DIN 9021	__	1	000000000	0000
M14	15.0	44.0	2.7-3.3	Rockwell B68	DIN 9021	__	1	000000000	0000
M16	17.0	50.0	2.7-3.3	Rockwell B68	DIN 9021	__	1	000000000	0000
M18	20.0	56.0	3.4-4.6	Rockwell B68	DIN 9021	__	1	000000000	0000
M20	22.0	60.0	3.4-4.6	Rockwell B68	DIN 9021	__	1	000000000	0000
316 Stainless Steel
M2	2.2	7.0	0.6-1.0	Rockwell B75	DIN 9021	__	100	000000000	0000
M2.5	2.7	8.0	0.7-0.9	Rockwell B75	DIN 9021	__	100	000000000	0000
M3	3.2	9.0	0.7-0.9	Rockwell B75	DIN 9021	__	50	000000000	0000
M4	4.3	12.0	0.9-1.1	Rockwell B75	DIN 9021	__	50	000000000	0000
M5	5.3	15.0	1.0-1.4	Rockwell B75	DIN 9021	__	50	000000000	00000
M6	6.4	18.0	1.4-1.8	Rockwell B75	DIN 9021	__	25	000000000	0000
M7	7.4	22.0	1.8-2.2	Rockwell B75	DIN 9021	__	10	000000000	0000
M8	8.4	24.0	1.8-2.2	Rockwell B75	DIN 9021	__	10	000000000	0000
M10	10.5	30.0	2.3-2.7	Rockwell B75	DIN 9021	__	5	000000000	0000
M12	13.0	37.0	2.7-3.3	Rockwell B75	DIN 9021	__	1	000000000	0000
M14	15.0	44.0	2.7-3.3	Rockwell B75	DIN 9021	__	1	000000000	0000
M16	17.0	50.0	2.7-3.3	Rockwell B75	DIN 9021	__	1	000000000	0000
M18	20.0	56.0	3.4-4.6	Rockwell B75	DIN 9021	__	1	000000000	0000
M20	22.0	60.0	3.4-4.6	Rockwell B75	DIN 9021	__	1	000000000	0000
M24	26.8	72.0	4.0-6.0	Rockwell B68	DIN 9021	__	1	000000000	0000
Bumax 88 Stainless Steel
M6	6.4	18.0	1.4-1.8	Rockwell B91	DIN 9021, ISO 7093	__	5	000000000	0000
M8	8.4	24.0	1.8-2.2	Rockwell B91	DIN 9021, ISO 7093	__	5	000000000	0000
M10	10.5	30.0	2.3-2.7	Rockwell B91	DIN 9021, ISO 7093	__	1	000000000	0000
M12	13.0	37.0	2.7-3.3	Rockwell B91	DIN 9021, ISO 7093	__	1	000000000	0000

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