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Nickel 201 washers are load-distributing fastener components manufactured from commercially pure, low-carbon nickel (UNS N02201), specifically engineered for high-temperature and caustic service environments where standard carbon steel or austenitic stainless grades fail prematurely. With a nickel content of 99.0% minimum and a carbon ceiling of 0.02%, these washers resist graphitization at elevated temperatures — a critical property that Nickel 200 does not reliably offer above 315°C (600°F).
The material conforms to ASTM B160 (rod and bar) specifications and is commonly referenced against DIN 17740 and ISO 6208 for dimensional and mechanical compliance. Primary industries served include chemical processing, aerospace, marine engineering, and power generation — sectors where material failure is measured in unplanned downtime, not just replacement cost.
KK Fasteners manufactures and exports Nickel 201 washers with full material traceability and mill test reports on every consignment, supplying clients across 30+ countries including petrochemical majors in the Middle East and process equipment OEMs in Europe.
| Parameter | Specification |
|---|---|
| Material | Nickel 201 (UNS N02201), Commercially pure wrought nickel |
| Grade | Nickel 201 (Low carbon nickel alloy) |
| Applicable Standards | ASTM B160, ASTM B162, ASME SB160, DIN 125 (as applicable), ISO standards |
| Size Range | M3 to M64 / 1/8" to 2.5" |
| Thickness | 0.3 mm – 10 mm |
| Inner Diameter | As per bolt size (metric & imperial compatibility) |
| Outer Diameter | 6 mm – 120 mm (custom sizes available) |
| Hardness | 45–85 HRB (Annealed condition) |
| Tensile Strength | 345–485 MPa |
| Density | 8.89 g/cm³ |
| Melting Point | 1435°C – 1446°C |
| Finish Options | Bright, polished, passivated, as-machined |
| Types | Flat washers, heavy-duty washers, custom engineered variants |
| Thread Compatibility | Metric (M), UNC, UNF, BSF (as per application) |
| Nickel 201 | Ni | C | Mo | Mn | Si | Fe | P | S | Cu | Cr |
| 99.0 min | 0.15 max | – | 0.35 max | 0.1 max | 0.4 max | – | 0.01 max | 0.25 max | – |
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.9 g/cm3 | 1446 °C (2635 °F) | Psi – 21500 , MPa – 148 | Psi – 67000 , MPa – 462 | 45 % |
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Nickel 201 | N02201 | 2.4066 | N-100M | Ni 99.2 | NW 2201 | NA 11 | НП-2 |
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" |
- |
- |
- |
Nickel 201 washers are used in industries requiring extreme corrosion resistance, thermal stability, and long service life under harsh operating conditions.
Nickel 201 washers are manufactured using precision cold forging and CNC-based finishing processes to ensure consistent geometry and surface integrity. Raw material billets are solution-annealed before forming to achieve optimal ductility and uniform grain structure.
Each batch undergoes strict quality control including dimensional inspection, hardness verification, and surface finish analysis. Non-destructive testing methods are applied where required to ensure structural integrity in critical applications. Full traceability is maintained through heat number marking and material certification.
KK Fasteners integrates ISO 9001:2015 quality management systems, ensuring every washer meets global industrial standards before dispatch to international clients.
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Nickel 201 washers are precision flat fastening components made from commercially pure nickel alloy UNS N02201. They are used to distribute load in bolted joints while providing exceptional resistance to corrosion in alkaline, chemical, and high-temperature industrial environments such as chemical plants, marine systems, and power generation units.
Nickel 201 offers lower carbon content compared to Nickel 200, which improves resistance to embrittlement at elevated temperatures. It provides superior performance in caustic alkali environments and maintains mechanical stability up to approximately 600°C, making it ideal for demanding industrial applications where stainless steel may fail.
Nickel 201 washers are commonly manufactured in compliance with ASTM B160 and ASTM B162 standards for nickel alloys. Dimensional specifications may also follow DIN 125 or ISO standards depending on application requirements to ensure global compatibility and interchangeability.
They are widely used in chemical processing equipment, marine engineering structures, aerospace assemblies, oil refineries, and power generation systems. These washers are selected for environments involving corrosive media, high temperatures, and mechanical stress where long-term reliability is essential.
A reliable supplier should offer certified raw materials, ISO-compliant manufacturing, full traceability, and adherence to ASTM standards. Strong technical support, consistent dimensional accuracy, and proven export capability are also critical. Companies like KK Fasteners ensure controlled quality systems and global supply reliability for industrial buyers.
Nickel 201 Washers provide unmatched performance in corrosive and high-temperature environments where reliability is critical. With precision manufacturing and certified material control, KK Fasteners delivers consistent quality for demanding industrial applications across global markets.
For technical specifications, bulk pricing, or OEM customization, connect with KK Fasteners to receive application-specific engineering support and a detailed quotation.
