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Stainless Steel 446 Washers are precision-engineered fastening components designed for extreme temperature and oxidation-resistant applications where standard stainless grades fail. Manufactured from ferritic stainless steel with high chromium content (23–27%), these washers offer exceptional resistance to scaling, sulfur-bearing atmospheres, and thermal fatigue. They are widely used in heat treatment furnaces, petrochemical plants, and power generation systems where continuous exposure above 1000°C is common.
| Material | Stainless Steel 446 (UNS S44600) |
|---|---|
| Grade | SS 446 / ASTM A240 Type 446 |
| Size Range | M3 to M64 / 1/8" to 2.5" |
| Standards | DIN 125, DIN 9021, ISO 7089, ISO 7093 |
| Thickness Range | 0.5 mm to 12 mm |
| Type Variants | Flat Washers, Plain Washers, Heavy Washers, Custom Cut Washers |
| Surface Finish | Plain, Pickled, Passivated, Polished |
| Hardness | Approx. 180–220 HV |
| Temperature Resistance | Up to 1100°C (intermittent service) |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 446 | 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 | ||||
| 446 | 480 | 275 | 16 | 95 | 201 |
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 446 | 1.4762 | S44600 | SUS 446 | - | X10CrAlSi25 |
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 446 Washers are primarily used in high-temperature and oxidation-prone industrial environments where joint stability is critical.
Stainless Steel 446 Washers are typically produced using precision stamping or CNC machining, depending on thickness and dimensional requirements. The process includes controlled cutting, deburring, and surface finishing to meet international tolerance standards.
Each batch undergoes dimensional inspection, hardness verification, and surface integrity checks to ensure compliance with DIN and ISO specifications. Material traceability is maintained through heat numbers and mill test certificates.
At KK Fasteners, quality assurance aligns with ISO 9001-certified processes, including raw material verification, in-process inspection, and final batch validation before dispatch. This ensures consistent performance in critical high-temperature applications.
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Stainless Steel 446 washers are flat load-distributing components made from high-chromium ferritic stainless steel. They are specifically designed for high-temperature environments, offering excellent resistance to oxidation and scaling, making them suitable for furnaces, exhaust systems, and thermal processing equipment.
Yes, SS 446 is highly suitable for elevated temperature applications. With chromium content between 23–27%, it provides excellent oxidation resistance and maintains structural stability at temperatures exceeding 1000°C, making it ideal for heat-intensive industrial environments.
Stainless Steel 446 washers are typically manufactured according to DIN 125, DIN 9021, ISO 7089, and ISO 7093 dimensional standards. The material itself conforms to ASTM A240 Type 446, ensuring consistent chemical composition and high-temperature performance.
Selection depends on operating temperature, load conditions, and exposure environment. SS 446 washers are best suited for high-temperature, oxidizing conditions. For corrosive chemical environments, other grades like SS 316 may be more appropriate.
A reliable supplier should offer ISO-certified manufacturing, full material traceability, and inspection documentation. KK Fasteners supports global buyers with consistent quality, test certificates, and export-ready packaging for industrial applications.
Stainless Steel 446 Washers play a critical role in maintaining joint reliability under extreme thermal conditions, where material failure is not an option. With controlled manufacturing processes, certified material sourcing, and global logistics support, KK Fasteners delivers consistent supply for demanding industrial applications. Contact the team today to request a technical quote or discuss custom specifications for your project.
