stainless steel plain washers and flat washers

316 stainless steel flat washers close-up

stainless steel plate washers with large outside diameter

DIN 9021 ISO 7093 stainless steel penny washers

custom punched washers in stainless steel

plain washer types including flat washers, penny washers and shim washers

Stainless Steel Plain Washers & Flat Washers

Plain washers, also known as flat washers, are used to distribute load, protect contact surfaces, improve assembly stability, and support reliable fastening with bolts, screws, studs, and nuts.

ViaWay Global supplies stainless steel plain washers in 304/A2, 316/A4, 316L and other corrosion-resistant materials, with special alloys available for demanding environments. Standard options include DIN 125, ISO 7089, DIN 9021 / ISO 7093, ASME flat washer dimensions, and custom washers based on drawings or samples.

Product Specifications

Size Range:
Metric: M2 to M64
Imperial: #4 to 3″
Custom inside diameter, outside diameter, thickness, and large OD washers available.
Materials:
Stainless Steel: 304/A2, 316/A4, 316L, 310S
Special Alloys: Duplex 2205, Super Duplex 2507, Titanium, Inconel, Hastelloy, Monel, A286 and other materials on request
Carbon Steel: Available on request for standard or cost-sensitive applications
Manufacturing Standards:
Metric Standards: DIN 125 Form A/B, ISO 7089, ISO 7090, DIN 9021, ISO 7093, DIN 433, DIN 988
Imperial Standards: ASME flat washer dimensions, SAE / USS flat washers
Structural / Heavy-Duty Options: ASTM F436 / F436M available where applicable
Washer Types:
Plain washers, flat washers, penny washers / fender washers, plate washers, shim washers, spacer washers, heavy-duty washers, and custom punched washers.
Surface Finish:
Passivated, plain, polished, black oxide, zinc plated, PTFE coated, or other project-specific surface treatments.
Custom Options:
Custom OD, ID, thickness, oversized washers, ultra-thin shims, slotted washers, square-hole washers, chamfered edges, deburring, and special packaging.

Applications

Plain washers are widely used in machinery assembly, equipment manufacturing, steel structures, pipe supports, electrical enclosures, control panels, outdoor installations, and general industrial fastening. They help distribute clamping force, reduce surface damage, and improve fastening stability when used with bolts, screws, studs, and nuts.

For humid, outdoor, marine, chemical, or corrosion-prone environments, 304 and 316 stainless steel washers are commonly selected. Special alloy washers can also be supplied for projects requiring higher corrosion resistance, temperature resistance, or specific material compatibility.

Manufacturing & Customization

ViaWay Global supports both standard and custom plain washers for B2B buyers. Customers can send standard numbers, drawings, samples, material requirements, surface finish requirements, or size lists for quotation.

Custom options include non-standard inside diameter, outside diameter, thickness, large OD washers, ultra-thin shim washers, plate washers, slotted washers, square-hole washers, chamfered edges, deburring, and special materials. For stainless steel and special alloy washers, we can support material confirmation, dimensional inspection, surface treatment, and documentation according to order requirements.

Plain Washer Dimensions

Plain Washer Dimensions-DIN 125A / ISO 7089

Equivalent norms: ISO 7089; CSN 21702; PN 82006; UNI 6592;

Size	M	d		dc		h			per 1000 units ≈ kg
Size	For thread size	min=nominal size	max	max=nominal size	min	Nominal Size	max	min	per 1000 units ≈ kg
Φ1.7	M1.6	1.7	1.84	4	3.7	0.3	0.35	0.25	0.024
Φ1.8	M1.7	1.8	1.94	4.5	4.2	0.3	0.35	0.25	0.031
Φ2.2	M2	2.2	2.34	5	4.7	0.3	0.35	0.25	0.037
Φ2.5	M2.3	2.5	2.64	6	5.7	0.5	0.55	0.45	0.092
Φ2.7	M2.5	2.7	2.84	6	5.7	0.5	0.55	0.45	0.088
Φ2.8	M2.6	2.8	2.94	7	6.64	0.5	0.55	0.45	0.127
Φ3.2	M3	3.2	3.38	7	6.64	0.5	0.55	0.45	0.119
Φ3.7	M3.5	3.7	3.88	8	7.64	0.5	0.55	0.45	0.155
Φ4.3	M4	4.3	4.48	9	8.64	0.8	0.9	0.7	0.308
Φ5.3	M5	5.3	5.48	10	9.64	1	1.1	0.9	0.443
Φ6.4	M6	6.4	6.62	12	11.57	1.6	1.8	1.4	1.02
Φ7.4	M7	7.4	7.62	14	13.57	1.6	1.8	1.4	1.39
Φ8.4	M8	8.4	8.62	16	15.57	1.6	1.8	1.4	1.83
Φ10.5	M10	10.5	10.77	20	19.48	2	2.2	1.8	3.57
Φ13	M12	13	13.27	24	23.48	2.5	2.7	2.3	6.27
Φ15	M14	15	15.27	28	27.48	2.5	2.7	2.3	8.62
Φ17	M16	17	17.27	30	29.48	3	3.3	2.7	11.3
Φ19	M18	19	19.33	34	33.38	3	3.3	2.7	14.7
Φ21	M20	21	21.33	37	36.38	3	3.3	2.7	17.2
Φ23	M22	23	23.33	39	38.38	3	3.3	2.7	18.3
Φ25	M24	25	25.33	44	43.38	4	4.3	3.7	32.3
Φ27	M26	27	27.33	50	49.38	4	4.3	3.7	43.7
Φ28	M27	28	28.33	50	49.38	4	4.3	3.7	42.3
Φ29	M28	29	29.33	50	49.38	4	4.3	3.7	40.9
Φ31	M30	31	31.39	56	55.26	4	4.3	3.7	53.6
Φ33	M32	33	33.62	60	58.8	5	5.6	4.4	77.4
Φ34	M33	34	34.62	60	58.8	5	5.6	4.4	75.3
Φ36	M35	36	36.62	66	64.8	5	5.6	4.4	94.3
Φ37	M36	37	37.62	66	64.8	5	5.6	4.4	92.1
Φ39	M38	39	39.62	72	70.8	6	6.6	5.4	136
Φ40	M39	40	40.62	72	70.8	6	6.6	5.4	133
Φ41	M40	41	41.62	72	70.8	6	6.6	5.4	130

Plain Washer Dimensions-DIN 9021 / ISO 7093

Nominal Diameter	For thread diameter	d		dc		h			per 1000 units ≈ kg
Nominal Diameter	For thread diameter	min=nominal size	max	max=nominal size	min	Nominal Size	max	min	per 1000 units ≈ kg
2.7	2.5	2.7	2.84	8	7.64	0.8	0.9	0.7	0.28
3.2	3	3.2	3.38	9	8.64	0.8	0.9	0.7	0.349
3.7	3.5	3.7	3.88	11	10.57	0.8	0.9	0.7	0.529
4.3	4	4.3	4.48	12	11.57	1	1.1	0.9	0.774
5.3	5	5.3	5.48	15	14.57	1.2	1.4	1	1.46
6.4	6	6.4	6.62	18	17.57	1.6	1.8	1.4	2.79
7.4	7	7.4	7.62	22	21.48	2	2.2	1.8	5.29
8.4	8	8.4	8.62	24	23.48	2	2.2	1.8	6.23
10.5	10	10.5	10.77	30	29.48	2.5	2.7	2.3	12.2
13	12	13	13.27	37	36.38	3	3.3	2.7	22.2
15	14	15	15.27	44	43.38	3	3.3	2.7	31.6
17	16	17	17.27	50	49.38	3	3.3	2.7	40.9
20	18	20	20.52	56	54.1	4	4.6	3.4	67.4
22	20	22	22.52	60	58.1	4	4.6	3.4	76.8
26	24	26	26.84	72	70.1	5	6	4	139
33	30	33	34	92	89.8	6	7	5	273
39	36	39	40	110	107.8	8	9.2	6.8	522

Plain Washer Dimensions-ASME B18.21.1 Type A

Size	Series	d			dc			h
Size	Series	Nominal Size	max	min	Nominal Size	max	min	Nominal Size	max	min
0#	-	0.078	0.078	0.073	0.188	0.188	0.183	0.02	0.025	0.016
2#	-	0.094	0.094	0.089	0.25	0.25	0.245	0.02	0.025	0.016
4#	-	0.125	0.133	0.12	0.312	0.32	0.307	0.032	0.04	0.025
6#	-	0.156	0.164	0.151	0.375	0.39	0.37	0.049	0.065	0.036
8#	-	0.188	0.196	0.183	0.438	0.453	0.433	0.049	0.065	0.036
10#	-	0.219	0.227	0.214	0.5	0.515	0.495	0.049	0.065	0.036
3/16	-	0.25	0.265	0.245	0.562	0.577	0.557	0.049	0.065	0.036
12#	-	0.25	0.265	0.245	0.562	0.577	0.557	0.065	0.08	0.051
1/4	N	0.281	0.296	0.276	0.625	0.64	0.62	0.065	0.08	0.051
1/4	W	0.312	0.327	0.307	0.734	0.749	0.727	0.065	0.08	0.051
5/16	N	0.344	0.359	0.339	0.688	0.703	0.681	0.065	0.08	0.051
5/16	W	0.375	0.39	0.37	0.875	0.905	0.868	0.083	0.104	0.064
3/8	N	0.406	0.421	0.401	0.812	0.827	0.805	0.065	0.08	0.051
3/8	W	0.438	0.453	0.433	1	1.03	0.993	0.083	0.104	0.064
7/16	N	0.469	0.484	0.464	0.922	0.937	0.915	0.065	0.08	0.051
7/16	W	0.5	0.515	0.495	1.25	1.28	1.243	0.083	0.104	0.064
1/2	N	0.531	0.546	0.526	1.062	1.092	1.055	0.095	0.121	0.074
1/2	W	0.562	0.577	0.557	1.375	1.405	1.368	0.109	0.132	0.086
9/16	N	0.594	0.609	0.589	1.156	1.186	1.149	0.095	0.121	0.074
9/16	W	0.625	0.64	0.62	1.469	1.499	1.462	0.109	0.132	0.086
5/8	N	0.656	0.686	0.649	1.312	1.342	1.305	0.095	0.121	0.074
5/8	W	0.688	0.718	0.681	1.75	1.78	1.743	0.134	0.16	0.108
3/4	N	0.812	0.842	0.805	1.469	1.499	1.462	0.134	0.16	0.108
3/4	W	0.812	0.842	0.805	2	2.03	1.993	0.148	0.177	0.122
7/8	N	0.938	0.968	0.931	1.75	1.78	1.743	0.134	0.16	0.108
7/8	W	0.938	0.968	0.931	2.25	2.28	2.243	0.165	0.192	0.136
1	N	1.062	1.092	1.055	2	2.03	1.993	0.134	0.16	0.108
1	W	1.062	1.092	1.055	2.5	2.53	2.493	0.165	0.192	0.136
1-1/8	N	1.25	1.28	1.243	2.25	2.28	2.243	0.134	0.16	0.108
1-1/8	W	1.25	1.28	1.243	2.75	2.78	2.743	0.165	0.192	0.136
1-1/4	N	1.375	1.405	1.368	2.5	2.53	2.493	0.165	0.192	0.136
1-1/4	W	1.375	1.405	1.368	3	3.03	2.993	0.165	0.192	0.136
1-3/8	N	1.5	1.53	1.493	2.75	2.78	2.743	0.165	0.192	0.136
1-3/8	W	1.5	1.545	1.49	3.25	3.295	3.24	0.18	0.213	0.153
1-1/2	N	1.625	1.655	1.618	3	3.03	2.993	0.165	0.192	0.136
1-1/2	W	1.625	1.67	1.615	3.5	3.545	3.49	0.18	0.213	0.153
1-5/8	-	1.75	1.795	1.74	3.75	3.795	3.74	0.18	0.213	0.153
1-3/4	-	1.875	1.92	1.865	4	4.045	3.99	0.18	0.213	0.153
1-7/8	-	2	2.045	1.99	4.25	4.295	4.24	0.18	0.213	0.153
2	-	2.125	2.17	2.115	4.5	4.545	4.49	0.18	0.213	0.153
2-1/4	-	2.375	2.42	2.365	4.75	4.795	4.74	0.22	0.248	0.193
2-1/2	-	2.625	2.67	2.615	5	5.045	4.99	0.238	0.28	0.21
2-3/4	-	2.875	2.94	2.865	5.25	5.315	5.24	0.259	0.31	0.228
3	-	3.125	3.19	3.115	5.5	5.565	5.49	0.284	0.327	0.249

ASME B 18.2.6 Hardened Steel Circular and Circular Clipped Washers (ASTM F436 / F436M)

Size	d		dc			h		n
Size	min	max	Nominal Size	min	max	min	max	min
1/2	0.531	0.563	1.063	1.031	1.095	0.097	0.177	0.438
5/8	0.688	0.72	1.313	1.281	1.345	0.122	0.177	0.547
3/4	0.813	0.845	1.469	1.437	1.501	0.122	0.177	0.656
7/8	0.938	0.97	1.75	1.718	1.782	0.136	0.177	0.766
1	1.063	1.085	2	1.937	2.063	0.136	0.177	0.875
1-1/8	1.188	1.251	2.25	2.187	2.313	0.136	0.177	0.984
1-1/4	1.375	1.438	2.5	2.437	2.563	0.136	0.177	1.094
1-3/8	1.5	1.563	2.75	2.687	2.813	0.136	0.177	1.203
1-1/2	1.625	1.688	3	2.937	3.063	0.136	0.177	1.313

DIN EN 14399 - 6 Plain Chamfered Washer

For thread diameter	d		dc		h			e		c
For thread diameter	max	min	max	min	Nominal Size	max	min	min=nominal size	max	min	max
M12	13.27	13	24	23.48	3	3.3	2.7	0.5	1	1.6	1.9
(M14)	15.27	15	28	27.48	3	3.3	2.7	0.5	1	1.6	1.9
M16	17.27	17	30	29.48	4	4.3	3.7	0.75	1.5	1.6	1.9
(M18)	19.33	19	34	33.38	4	4.3	3.7	0.75	1.5	2	2.5
M20	21.33	21	37	36.38	4	4.3	3.7	0.75	1.5	2	2.5
M22	23.33	23	39	38.38	4	4.3	3.7	0.75	1.5	2	2.5
M24	25.33	25	44	43.38	4	4.3	3.7	0.75	1.5	2	2.5
M27	28.52	28	50	49	5	5.6	4.4	1	2	2.5	3
M30	31.62	31	56	54.8	5	5.6	4.4	1	2	2.5	3
M36	37.62	37	66	64.8	6	6.6	5.4	1.25	2.5	2.5	3

Need a Quote? Send What You Have

Not sure about the exact washer standard, material, or dimensions? No problem. Send us your drawing, size list, standard number, sample photo, or application details. Our team will help confirm the suitable washer type, material, dimensions, surface finish, and production options.

Standard or Drawing

DIN 125, ISO 7089, DIN 9021 / ISO 7093, ASME flat washer dimensions, ASTM F436 / F436M, or custom drawing.

Size or Sample Photo

Inside diameter, outside diameter, thickness, nominal bolt size, or a clear sample photo if you are not sure.

Material Preference

304, 316, 316L stainless steel, duplex stainless steel, titanium, nickel alloys, carbon steel, passivation, polishing, zinc plating, black oxide, or other finishes.

Quantity & Application

Estimated quantity, packaging needs, and where the washers will be used.