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Stainless Steel 410 Washers are hardened martensitic fasteners designed to distribute load, reduce surface wear, and improve joint stability in medium-to-high strength assemblies. Manufactured from ASTM A276 / AISI 410 grade stainless steel, these washers offer a unique combination of mechanical strength and moderate corrosion resistance, making them suitable for automotive assemblies, industrial machinery, and heavy equipment maintenance systems. Unlike austenitic grades such as SS 304, SS 410 washers are heat-treatable, enabling improved hardness and wear resistance after quenching and tempering.
In demanding environments where fastening integrity under load is critical, Stainless Steel 410 Washers provide reliable dimensional stability and torque retention. KK Fasteners supplies these washers to OEMs and industrial distributors across global markets, ensuring consistent metallurgy, precision stamping, and full traceability for every batch.
| Parameter | Specification |
|---|---|
| Material | Stainless Steel 410 (Martensitic Grade) |
| Grades | SS 410, SS 410S (low carbon variant) |
| Size Range | M3 to M100 / 1/8" to 4" |
| Standards | DIN 125, DIN 9021, ISO 7089, ASTM F436 |
| Thread Compatibility | Metric, UNC, UNF |
| Surface Finish | Polished, Passivated, Black Oxide (on request) |
| Type Variants | Flat Washers, Spring Washers, Heavy Duty Washers |
| Hardness | HRC 28–40 (heat-treated condition) |
| Tensile Strength | Up to 700–950 MPa (depending on heat treatment) |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 410 | min. | – | – | – | – | – | 11.5 | – | – | – |
| max. | 0.15 | 1.0 | 1.00 | 0.040 | 0.030 | 13.5 | – | 0.75 | – | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 410 | 480 | 275 | 16 | 95 | 201 |
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 410 | S41000 | 410S21 | 56A | 1.4006 | X12Cr13 | 2302 | SUS 410 |
Bolt Size
|
USS
|
SAE
|
||||
OD (in.)
|
ID (in.)
|
Thickness
|
OD (in.)
|
ID (in.)
|
Thickness
|
|
1/8 (#6)
|
-
|
-
|
-
|
0.375
|
0.156
|
.036/.065
|
5/32 (#8)
|
-
|
-
|
-
|
0.438
|
0.188
|
.036/.065
|
3/16 (#10)
|
0.560
|
0.250
|
.036/.065
|
0.500
|
0.220
|
.036/.065
|
7/32 (#12)
|
-
|
-
|
-
|
0.562
|
0.250
|
.051/.080
|
1/4 (#14)
|
0.734
|
0.312
|
.051/.080
|
0.625
|
0.281
|
.051/.080
|
5/16
|
0.875
|
0.375
|
.064/.104
|
0.688
|
0.344
|
.051/.080
|
3/8
|
1.000
|
0.438
|
.064/.104
|
0.812
|
0.406
|
.051/.080
|
7/16
|
1.250
|
0.500
|
.064/.104
|
0.922
|
0.469
|
.051/.080
|
1/2
|
1.375
|
0.562
|
.086/.132
|
1.062
|
0.531
|
.074/.121
|
9/16
|
1.469
|
0.625
|
.086/.132
|
1.156
|
0.594
|
.074/.121
|
5/8
|
1.750
|
0.688
|
.108/.160
|
1.312
|
0.656
|
.074/.121
|
3/4
|
2.000
|
0.812
|
.122/.177
|
1.469
|
0.812
|
.108/.160
|
7/8
|
2.250
|
0.938
|
.136/.192
|
1.750
|
0.938
|
.108/.160
|
1
|
2.500
|
1.062
|
.136/.192
|
2.000
|
1.062
|
.108/.160
|
1 1/8
|
2.750
|
1.250
|
.136/.192
|
2.250
|
1.250
|
.108/.160
|
1 1/4
|
3.000
|
1.375
|
.136/.192
|
2.500
|
1.375
|
.136/.192
|
1 3/8
|
3.250
|
1.500
|
.153/.213
|
2.750
|
1.500
|
.136/.213
|
1 1/2
|
3.500
|
1.625
|
.153/.213
|
3.000
|
1.625
|
.153/.213
|
1 5/8
|
3.750
|
1.750
|
.153/.213
|
-
|
-
|
-
|
1 3/4
|
4.000
|
1.875
|
.153/.213
|
-
|
-
|
-
|
1 7/8
|
4.250
|
2.000
|
.153/.213
|
-
|
-
|
-
|
2
|
4.500
|
2.125
|
.153/.213
|
-
|
-
|
-
|
2 1/4
|
4.750
|
2.375
|
.320/.248
|
-
|
-
|
-
|
2 1/2
|
5.000
|
2.625
|
.210/.280
|
-
|
-
|
-
|
2 3/4
|
5.250
|
2.875
|
.228/.410S
|
-
|
-
|
-
|
3
|
5.500
|
3.125
|
.249/.327
|
-
|
-
|
-
|
Size |
USS |
SAE |
||||
|---|---|---|---|---|---|---|
Inside Diameter (A) |
Outside Diameter (B) |
Thickness (C) |
Inside Diameter (A) |
Outside Diameter (B) |
Thickness (C) |
|
#2 |
- |
- |
- |
3/32" |
1/4" |
0.020" |
#4 |
- |
- |
- |
1/8" |
5/16" |
0.032" |
#6 |
- |
- |
- |
5/32" |
3/8" |
0.049" |
#8 |
- |
- |
- |
3/16" |
7/16" |
0.049" |
#10 |
- |
- |
- |
7/32" |
1/2" |
0.049" |
#12 |
- |
- |
- |
1/4" |
9/16" |
0.065" |
1/4" |
5/16" |
0.734" |
0.065" |
9/32" |
5/8" |
0.065" |
5/16" |
3/8" |
7/8" |
0.083" |
11/32" |
11/16" |
0.065" |
3/8" |
7/16" |
1" |
0.083" |
13/32" |
13/16" |
0.065" |
7/16" |
1/2" |
1-1/4" |
0.083" |
15/32" |
15/16" |
0.065" |
1/2" |
9/16" |
1-3/8" |
0.109" |
17/32" |
1-1/16" |
0.095" |
9/16" |
5/8" |
1-15/32" |
0.109" |
19/32" |
1-5/32" |
0.095" |
5/8" |
11/16" |
1-3/4" |
0.134" |
21/32" |
1-5/16" |
0.095" |
3/4" |
13/16" |
2" |
0.148" |
13/16" |
1-15/32" |
0.134" |
7/8" |
15/16" |
2-1/4" |
0.165" |
15/16" |
1-3/4" |
0.134" |
1" |
1-1/16" |
2-1/2" |
0.165" |
1-1/16" |
2" |
0.134" |
1-1/8" |
1-1/4" |
2-3/4" |
0.165" |
- |
- |
- |
1-1/4" |
1-3/8" |
3" |
0.165" |
- |
- |
- |
1-3/8" |
1-1/2" |
3-1/4" |
0.180" |
- |
- |
- |
1-1/2" |
1-5/8" |
3-1/2" |
0.180" |
- |
- |
- |
1-5/8" |
1-3/4" |
3-3/4" |
0.180" |
- |
- |
- |
1-3/4" |
1-7/8" |
4" |
0.180" |
- |
- |
- |
2" |
2-1/8" |
4-1/2" |
0.213" |
- |
- |
- |
Stainless Steel 410 Washers are used in mechanical assemblies where strength and wear resistance are more critical than extreme corrosion protection. They are commonly selected for load-bearing joints, rotating equipment, and industrial fastening systems requiring stability under vibration and pressure.
Stainless Steel 410 Washers are manufactured using precision stamping followed by controlled heat treatment processes such as quenching and tempering. This ensures the martensitic structure achieves the required hardness levels while maintaining dimensional consistency.
Each batch undergoes strict dimensional inspection, hardness verification, and surface finish validation. Lot traceability is maintained from raw material sourcing to final dispatch. KK Fasteners follows ISO 9001-certified quality systems, ensuring compliance with international fastener standards. Additional checks include load testing, coating adhesion tests (if applicable), and visual defect inspection to eliminate burrs and surface irregularities before packaging.
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Stainless Steel 410 Washers are hardened martensitic fasteners used to distribute load and prevent surface damage in bolted joints. They are known for high strength, wear resistance, and moderate corrosion resistance, making them suitable for automotive, machinery, and structural engineering applications.
SS 410 washers are made from martensitic stainless steel that can be heat-treated to increase hardness. After quenching and tempering, they typically achieve HRC 28–40, offering strong mechanical performance and better wear resistance compared to austenitic grades like SS 304.
These washers are manufactured according to international standards such as DIN 125, DIN 9021, ISO 7089, and ASTM F436. These standards ensure dimensional accuracy, load distribution efficiency, and compatibility with global fastening systems
They are widely used in automotive engines, heavy machinery, compressors, railway equipment, and industrial fabrication. They are ideal for applications where vibration resistance, mechanical strength, and durability are more important than high corrosion resistance.
A reliable manufacturer should provide certified raw materials, ISO 9001 quality systems, dimensional precision, and full traceability. Buyers should also check testing reports and export capability. Suppliers like KK Fasteners ensure consistent quality and global supply reliability.
Stainless Steel 410 Washers deliver a balanced combination of hardness, wear resistance, and structural reliability for demanding industrial environments. KK Fasteners supports OEM-grade production with strict quality control and global export logistics. For technical specifications, pricing, or custom engineering support, contact the KK Fasteners team to request a detailed quotation or product datasheet.
