Why Global Buyers Prefer Ganpat Industrial For Alloy 20 Washers?
Built For 20–40% Sulfuric Acid
Copper & niobium heats that shrug off acid duty other alloys can’t
Every Washer Type, One PO
Flat • Star • Conical • Lock • Sealing — single consolidated shipment
Niobium-Stabilized Heats
No PWHT needed — carbide precipitation resistant even after fabrication
Verified Before Dispatch
PMI • hardness • dimensional check on every single lot
Custom Dimensions Available
Precision dimensions tailored to customer specifications.
Alloy 20 Washers Quick Facts
- 1Type: Flat, Star, Punched, Conical, Lock, Sealing, Countersunk, Tooth, Tab, Split, Square, Machine, Spring, Slot
- 2Size Range: M2 to M56 • OD 5 mm to 100 mm
- 3Common Grades: UNS N08020, Alloy DIN 2.4660, Werkstoff Nr. 2.4660, 20Cb-3
- 4Standards: ASTM B366, ASTM B462, ASTM B463, ASTM B473, ASME B18.22.1
- 5Documentation: MTC 3.1 • NABL Lab Report • Certificate Of Origin • Inspection Reports
- 5Applications: Chemical Processing • Fertilizer Plants • Pharma Equipment
Or call our Mumbai office: +91 22 6743 7134 • Fast dispatch on ready stock sizes
An Alloy 20 Washer carries copper and niobium alongside chromium, nickel and molybdenum — the combination that keeps boiling sulfuric acid, phosphoric acid and chloride media from attacking the joint. Ganpat Industrial rolls and blanks every UNS N08020 washer in-house, then ships tested, fully documented stock to fertilizer, pickling, pharma and chemical process buyers across India, the UAE and the Middle East.
Mumbai · Alloy 20 Washers Manufacturer India
Engineered With Accuracy, Built For Reliability.
Ganpat Industrial delivers precision-engineered Alloy 20 Punched Washers designed for demanding chemical environments where corrosion resistance is critical. Trusted by industries across India, UAE, and Middle East, Our washers combine advanced metallurgy with precision manufacturing for superior service life.
- ✓ASTM B366 Compliant
- ✓PED Certified
- ✓Global Export Standards
- ✓Petrofac Approved
- ✓Mill Test Certificates
Alloy UNS N08020 Conical Washers Manufacturer in India
Alloy 20 Washers Specification
Alloy 20 Punched Washers Material
- UNS N08020
- Alloy DIN 2.4660
- 20Cb-3
- ASTM B463 Grade N08020
ASTM B366 Alloy 20 Conical Washers Size Range
- ID: M2 – M56
- OD: 5 – 100 mm
- Thickness: 0.3 – 8 mm
- Custom sizes on drawing
Alloy DIN 2.4660 Countersunk Washer Testing
- PMI Testing
- Intergranular Corrosion Test
- Dimensional Check
- Third-Party Inspection
20 Alloy Flat Washer Finish
- Solution Annealed
- Pickled & Passivated
- Bright Polished
- Natural Mill Finish
Alloy UNS N08020 Ogee Washers Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
Alloy WERKSTOFF NR. 2.4660 Lock Washers Quality Assurance
- Strict Quality Inspection
- Dimensional Accuracy Check
- Material Verification
- Batch-Wise Inspection Records
Purchase ASTM B366 Alloy 20 Machine Washers With Precise Dimensions And Fast Delivery
Dimensions of ASTM B366 Alloy 20 Machine Washers
| Nominal Size | T | Clipped Width E, Min. | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| I.D. | O.D. | Standard | Extra Thick | |||||||||||
| [Note (1)] | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | [Note (2)] | |||||
| 12 | 14.4 | 14 | 27 | 25.7 | 4.6 | 3.1 | 10 | 8 | 10.5 | |||||
| 20 | 22.5 | 22 | 42 | 40.4 | 4.6 | 3.1 | 10 | 8 | 17.5 | |||||
| 64 | 70.7 | 70 | 118 | 115.8 | 8.7 | 6.1 | 10 | 8 | 56 | |||||
| 22 | 24.5 | 24 | 44 | 42.4 | 4.6 | 3.4 | 10 | 8 | 19.2 | |||||
| 90 | 96.9 | 96 | 159 | 156.5 | 8.7 | 6.1 | 10 | 8 | 78.7 | |||||
| 56 | 62.7 | 62 | 107 | 104.8 | 8.7 | 6.1 | 10 | 8 | 49 | |||||
| 24 | 26.5 | 26 | 50 | 48.4 | 4.6 | 3.4 | 10 | 8 | 21 | |||||
| 30 | 33.6 | 33 | 60 | 58.1 | 4.6 | 3.4 | 10 | 8 | 26.2 | |||||
| 36 | 39.6 | 39 | 72 | 70.1 | 4.6 | 3.4 | 10 | 8 | 31.S | |||||
| 42 | 45.6 | 45 | 84 | 81.8 | 7.2 | 4.6 | 10 | 8 | 36.7 | |||||
| 100 | 107.9 | 107 | 176 | 173.5 | 8.7 | 6.1 | 10 | 8 | 87.5 | |||||
| 27 | 30.5 | 30 | 56 | S4.1 | 4.6 | 3.4 | 10 | 8 | 23.6 | |||||
| 16 | 18.4 | 18 | 34 | 32.4 | 4.6 | 3.1 | 10 | 8 | 14 | |||||
| 48 | 52.7 | 52 | 95 | 92.8 | 7.2 | 4.6 | 10 | 8 | 42 | |||||
| 72 | 78.7 | 78 | 130 | 127.5 | 8.7 | 6.1 | 10 | 8 | 63 | |||||
| 80 | 86.9 | 86 | 142 | 139.5 | 8.7 | 6.1 | 10 | 8 | 70 | |||||
Various Types of 20 Alloy Washers
Get Alloy 20 Washers Manufacturer in India providing assorted types with precision manufacturing.
Alloy 20 Flat Washer
DIN 125A
ASTM B366 Alloy 20 Star Washer
DIN 6797
UNS N08020 Punched Washers
Custom Punched
20 Alloy Conical Washers
DIN 6796
Alloy DIN 2.4660 Lock Washers
DIN 127
Alloy WERKSTOFF NR. 2.4660 Sealing Washers
Bonded Seal
Alloy 20 Countersunk Washer
DIN 6917
ASTM B366 Alloy 20 Tab Washers
DIN 93
Require Alloy 20 Flat Washer On Priority?Submit your requirements and receive a factory quote with MTC 3.1 documentation in 24 hours.
Alloy DIN 2.4660 Lock Washers Manufacturing Process
Raw Material & MTC Check
Incoming UNS N08020 coil verified against Mill Test Certificate 3.1
Coil Slitting & Blanking
Strip slit to width, blanked into rough washer discs
Precision Piercing
ID hole punched to tolerance on CNC power press tooling
Deburring & Edge Finish
Edges rounded for smooth bolt seating
Solution Annealing
Heat treated and rapid quenched to restore corrosion resistance
Inspection & Packing
PMI & dimensional check, then export-ready packing
Weight Chart of Alloy UNS N08020 Spring Washer
| NOM SIZE | Inner Dia (d) Basic Tol (+) | Outer Dia (d1) Max | WIDTH (b) = THICKNESS(s) Basic Tol (+ or -) | Weight Per 1000 IN KGS | ||
|---|---|---|---|---|---|---|
| 3 | 3.1 | 0.3 | 5.6 | 1 | 0.1 | 0.105 |
| 4 | 4.1 | 0.3 | 7 | 1.2 | 0.1 | 0.195 |
| 18 | 18.2 | 0.8 | 26.4 | 3.5 | 0.2 | 6.6 |
| 5 | 5.1 | 0.3 | 8.8 | 1.6 | 0.1 | 0.370 |
| 12 | 12.2 | 0.5 | 18 | 2.5 | 0.15 | 2.28 |
| 6 | 6.1 | 0.4 | 9.9 | 1.6 | 0.1 | 0.425 |
| 14 | 14.2 | 0.5 | 21.1 | 3 | 0.2 | 3.8 |
| 10 | 10.2 | 0.5 | 16 | 2.5 | 0.15 | 1.96 |
| 8 | 8.1 | 0.4 | 12.7 | 2 | 0.1 | 1.05 |
| 16 | 16.2 | 0.8 | 24.4 | 3.5 | 0.2 | 5.94 |
| 20 | 20.2 | 1 | 30.6 | 4.5 | 0.2 | 12.3 |
Applications of Alloy WERKSTOFF NR. 2.4660 Tab Washers
Find Alloy 20 Washers Supplier In India offering industrial applications for high performance environments.
Sulfuric Acid Plants
Phosphoric Acid Production
Fertilizer & Chemical Processing
Pickling & Descaling Baths
Flue Gas Desulfurization
Plastics & Synthetic Fiber Plants
Pulp & Paper Bleaching Units
Pharma & Food Grade Reactors
20 Alloy Slot Washer Delivered Weekly To The Following Countries
| Export to | Countries | Continent | Shipping time | Ports |
|---|---|---|---|---|
 |
Egypt | Africa | 18 Days | Damietta |
 |
Kuwait | Asia | 10 Days | Mina Al Shuaiba |
 |
Netherlands | Europe | 30 Days | Den Helder |
Buying In Bulk For A Fertilizer or Chemical Project?Send your BOQ – factory price, MTC 3.1, dispatch same week.
Chemical Composition of Alloy UNS N08020 Countersunk Washer
NickelNi
32.00–38.00%
ChromiumCr
19.00–21.00%
CopperCu
3.00–4.00%
MolybdenumMo
2.00–3.00%
ManganeseMn
≤ 2.00%
NiobiumNb
≤ 1.00%
CarbonC
≤ 0.07%
IronFe
Balance
Mechanical Properties of Alloy DIN 2.4660 Ogee Washers
Tensile Strength
620 MPa Typ.
Annealed Condition
Yield Strength
300 MPa Typ.
0.2% Proof Stress
Hardness
≤ 90 HRB
Solution Annealed
Elongation
41% Typ.
In 50 mm Gauge
20 Alloy Tooth Washer Equivalent
American Standard
- UNS N08020
- ASTM B366 / B462 / B463 / B473
- ASME SB462 / SB463 / SB472
European Standard
- Alloy DIN 2.4660
- Alloy WERKSTOFF NR. 2.4660
- EN 10088 / EN 10269
Trade & Brand Names
- Carpenter 20Cb-3
- Incoloy Alloy 20
- Cronifer 1925 hMo
Factors to Consider When Choosing the Right ASTM B366 Alloy 20 Star Washer
Bolt & Screw Size
Match washer ID to fastener diameter and check OD clearance on the joint
Factor 1
Base Material
Avoid galvanic mismatch and match hardness of the mating surface
Factor 2
Vibration Level
High vibration needs toothed or serrated, static joints need only a plain washer
Factor 3
Tooth Style
Internal star for a smooth outer edge, external star for maximum bite
Factor 4
Testing Methods of Alloy 20 Square Washer
Check Alloy 20 Washers Supplier in India offering advanced inspection methods with certified quality control.
PMI Test
Positive Material Identification on every heat
Visual Inspection
OD, ID, thickness & surface checked per lot
Intergranular Corrosion Test
ASTM A262 practice check on stabilized heats
Monthly Delivery of Alloy DIN 2.4660 Split Washer to Below Countries
| Export to | Countries | Continent | Shipping time | Ports |
|---|---|---|---|---|
|
Morocco | Africa | 45 Days | Nador |
|
Bahrain | Asia | 9 Days | Mina Salman |
Frequently Asked Questions
Is an Alloy 20 Flat Washer magnetic?
Alloy 20 in the solution-annealed condition is essentially non-magnetic.
What makes Alloy 20 different from Stainless Steel Washers?
Copper and niobium enhance Alloy 20’s sulfuric acid resistance beyond 304/316 stainless steel.
Can Alloy 20 Sealing Washers be used in phosphoric acid service?
Yes, Alloy 20 is a standard material choice for phosphoric acid and sulfuric acid duty.
Weekly Shipment to Below Locations
| Continents | Country |
|---|---|
| Africa | Nigeria, Egypt, South Africa, Kenya, Ghana, Ethiopia |
| North America | United States, Canada, Mexico, Cuba |
| Asia | India, Japan, South Korea, Indonesia, Saudi Arabia, Iran |
| Europe | Germany, France, UK, Italy, Spain, Poland, Ukraine |
| South America | Brazil, Argentina, Colombia, Chile, Peru |
| Australia | New Zealand, Papua New Guinea, Fiji, Samoa |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA