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Incoloy 330 / RA330 Washers are engineered for extreme thermal stability and oxidation resistance in environments where conventional stainless steel fasteners fail. Manufactured from a nickel-iron-chromium austenitic alloy (UNS N08330), these washers maintain mechanical integrity under continuous exposure to temperatures up to approximately 1150°C, making them essential in furnace assemblies, heat treatment systems, petrochemical units, and power generation equipment.
| Parameter | Specification |
|---|---|
| Material | Incoloy 330 / RA330 (UNS N08330), SS 304, SS 316, Inconel 600 (on request) |
| Grade | Austenitic Nickel-Iron-Chromium Alloy |
| Size Range | M3 to M64 / 1/8" to 2-1/2" (custom sizes available) |
| Thread Type Compatibility | Metric (ISO), UNC, UNF, BSW |
| Standards | ASTM B535, ASME SB535, DIN 125, ISO 7089 |
| Surface Finish | Bright, Polished, Passivated |
| Type | Flat Washer, Spring Washer (custom engineered variants) |
| Hardness | Up to 200–220 HB (depending on heat treatment condition) |
| Grade | C | Mn | Si | P | S | Cr | Cu | N | Fe |
| 330/330Ra | 0.08 max | 2 max | 0.75-1.50 | 0.030 | – | 17.0-20.0 | – | 34.0-37.0 | – |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 330/330Ra | 8.14 g/cm3 | 1400 °C (2550 °F) | Psi – 80,000 , MPa – 550 | Psi – 32,000 , MPa – 220 | 30 % |
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| Incoloy 330/330Ra | 1.4886 | N08330 | – | – | – | – | – |
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" |
- |
- |
- |
Incoloy 330 / RA330 Washers are used in high-temperature and corrosive environments where standard stainless steel washers fail due to oxidation or thermal fatigue.
The Incoloy 330 / RA330 Washers are manufactured using precision stamping and CNC-assisted cold forming processes to maintain strict dimensional accuracy. Raw material is sourced in certified alloy form and undergoes controlled forging or stamping depending on size and application requirements.
Each batch undergoes hardness testing, dimensional inspection, and surface finish validation to ensure compliance with ASTM B535 and international fastening standards. KK Fasteners implements full lot traceability, ensuring every washer can be tracked back to its heat number and material certificate. ISO 9001:2015-aligned quality systems and optional RoHS/REACH compliance support global industrial procurement requirements.
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Incoloy 330 / RA330 Washers are high-temperature resistant fasteners made from a nickel-iron-chromium alloy (UNS N08330). They are designed to maintain strength, dimensional stability, and oxidation resistance in extreme heat environments such as furnaces, kilns, and petrochemical systems operating above 900°C.
RA330 offers excellent resistance to carburization, oxidation, and thermal shock due to its balanced nickel and chromium composition. This allows it to withstand repeated heating and cooling cycles without losing mechanical integrity, making it ideal for continuous high-temperature industrial service.
These washers are generally manufactured in compliance with ASTM B535 and ASME SB535 material standards. Dimensional compatibility is typically aligned with DIN 125, ISO 7089, and other international fastening standards depending on application requirements.
RA330 washers are used in heat treatment furnaces, petrochemical processing units, power plants, industrial kilns, and chemical processing equipment. They are selected where conventional stainless steel fasteners fail under extreme thermal and corrosive conditions.
A reliable manufacturer should provide certified material traceability, ISO 9001 compliance, ASTM-standard production, and full inspection reports. KK Fasteners supplies RA330 washers globally with complete documentation support and consistent quality control for industrial procurement needs.
Incoloy 330 / RA330 Washers are critical components for high-temperature fastening reliability in industrial systems exposed to thermal and corrosive stress. KK Fasteners supports global engineering projects with precision-manufactured washers backed by certified material traceability and export documentation.
For technical specifications, pricing, or custom manufacturing support, connect with KK Fasteners to request a detailed quotation or engineering datasheet.
