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Stainless Steel 304H Washers are engineered for applications requiring enhanced strength retention at elevated temperatures while maintaining corrosion resistance in demanding industrial environments. Manufactured from a high-carbon variant of austenitic stainless steel, these washers comply with ASTM A240 and commonly align with DIN 125 and ISO 7089 dimensional standards depending on application requirements.
These washers are widely used in petrochemical plants, power generation systems, heat exchangers, and heavy engineering assemblies where mechanical stability under thermal stress is critical. The increased carbon content in SS 304H improves tensile strength and creep resistance compared to standard 304, making it suitable for sustained high-temperature service conditions.
KK Fasteners supplies Stainless Steel 304H Washers to global OEMs and industrial distributors with full traceability, consistent dimensional precision, and strict adherence to international fastening standards.
| Parameter | Specification |
|---|---|
| Material | Stainless Steel 304H (Austenitic Stainless Steel) |
| Equivalent Grades | AISI 304H, UNS S30409 |
| Washer Types | Flat Washer, Plain Washer, Heavy Duty Washer |
| Size Range | M3 to M64 / 1/8" to 2.5" |
| Thickness Range | 0.5 mm to 10 mm (custom sizes available) |
| Standards | DIN 125, DIN 9021, ISO 7089, ASTM F436 |
| Surface Finish | Bright Polished, Passivated, Pickled |
| Hardness | Up to 200 HV (approx.) |
| Tensile Strength | Minimum 515 MPa |
| Temperature Resistance | Up to ~870°C (intermittent service) |
| Thread Compatibility | Metric (M), UNC, UNF |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 304H | min. | – | – | – | – | – | 18.0 | – | 8.0 | – |
| max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||
| 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 | ||||
| 304H | 515 | 205 | 40 | 92 | 201 |
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 304H | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304H |
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 304H Washers are used wherever mechanical fastening systems must maintain stability under heat, vibration, and corrosive exposure.
Stainless Steel 304H Washers are manufactured using precision stamping and cold forging techniques to ensure dimensional accuracy and uniform load-bearing characteristics. The production process includes controlled blanking, heat treatment (where applicable), and surface finishing such as pickling or passivation to enhance corrosion resistance.
Each batch undergoes strict quality control including dimensional inspection, hardness testing, and surface integrity checks to ensure compliance with international standards like DIN and ASTM. KK Fasteners integrates full lot traceability across production cycles, enabling end-users to verify material origin and testing records. The quality system aligns with ISO 9001 practices, ensuring consistency across global supply shipments.
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Stainless Steel 304H Washers are high-carbon austenitic stainless steel components used to distribute load in bolted joints. They are designed for improved strength retention at elevated temperatures compared to standard 304 washers, making them suitable for boilers, heat exchangers, and refinery applications.
Yes, SS 304H is specifically developed for high-temperature service. The higher carbon content improves creep resistance and tensile stability, allowing the washer to maintain mechanical integrity in continuous heat exposure conditions found in power plants and petrochemical systems.
These washers are typically manufactured in accordance with DIN 125, DIN 9021, ISO 7089, and ASTM F436 standards. These specifications ensure dimensional accuracy, interchangeability, and consistent mechanical performance across global industrial applications.
The selection depends on operating conditions. SS 304H is ideal for high-temperature structural applications, while SS 316 is preferred in chloride-rich or marine environments. Engineers choose based on a balance of heat resistance, corrosion exposure, and load requirements.
A reliable supplier should offer ISO certification, material traceability, and compliance with international standards. Buyers should also verify testing reports and export experience. KK Fasteners supports global industrial buyers with documented quality control and consistent supply across multiple regions.
Stainless Steel 304H Washers deliver dependable performance in high-temperature industrial environments where standard grades may fail under sustained stress. With controlled manufacturing processes and strict quality verification, KK Fasteners ensures consistent supply for critical engineering applications worldwide.
For technical specifications, bulk pricing, or custom manufacturing requirements, connect with KK Fasteners to request a detailed quotation or engineering datasheet tailored to your project needs.
