Why Chemical & Marine Buyers Choose Ganpat Industrial For Stainless Steel 904L Washers ?
Built For Acid & Chloride Duty
High Mo, Cu & Ni chemistry outlasts 316L in aggressive media
PREN Rated Near 36
Among the highest pitting resistance scores of any common grade
Every Profile, One Dispatch
Sealing, spring, lock & square types packed on a single invoice
Heat-Batch Traceable
UNS N08904 heats recorded and matched to every consignment
Ready Stock, Fast Turnaround
Standard sizes boxed and export-ready this week
Stainless Steel 904L Washer Abstract
- 1Common Grades: UNS N08904, EN 1.4539, ASTM 904L, Werkstoff Nr. 1.4539
- 2Finish: Bright Annealed, Passivated, Polished, Natural Mill Finish
- 3Size Range: M2 to M36 • OD 5 mm to 66 mm • per ASTM A240
- 4Standards: ASME B18.22.1, DIN 125, DIN 127, DIN 6796, ISO 7089/7090
- 5Origin: Indian origin • Japanese origin • European origin
- 6Type: Plain, Spring, Sealing, Flat, Lock, Square, Fender, Countersunk
Or call our Mumbai office: +91 22 6743 7134 • Same-week dispatch on ready stock sizes
Ganpat Industrial forges UNS N08904 Washer and EN 1.4539 Washer components from a super-austenitic chemistry loaded with nickel, molybdenum and copper – the exact combination that keeps sulfuric acid lines, offshore seawater systems and chloride-heavy process equipment from pitting the way standard 316L eventually does. Every Stainless Steel 904L Washer we dispatch is built for the environments that retire lesser grades early.
Mumbai · Forging Manufacturer & Exporter
Stainless Steel 904L Washers Built For The Corrosion 316L Cannot Survive
Ganpat Industrial manufactures and exports Stainless Steel 904L Washers for buyers running sulfuric acid plants, offshore platforms and chloride-heavy process lines across India, the Gulf, Africa and Southeast Asia.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
Trusted SUS 904L Flat Washers Manufactured to Your Precise Specifications with Genuine MTC At Fair Price
Specification Of Stainless Steel 904L Washers
Leading Stainless Steel 904L Washers Manufacturer in India, we supply standards manufactured to precise client specifications
Stainless Steel 904L Fender Washers Size Range
- ID: M2 – M36
- OD: 5 – 66 mm
- Thickness: 0.3 – 5 mm
- Custom sizes on drawing
UNS N08904 Sealing Washers Standards
- ASME B18.22.1
- DIN 125 / DIN 127
- ISO 7089 / 7090 / 7091
- ISO 3506 (A5-70)
EN 1.4539 Flat Washers Production Route
- Precision Blanking
- CNC Punching
- Cold Forming (Spring/Fender)
- Deburring & Tumbling
ASTM 904L Spring Washers Surface Finish
- Bright Annealed
- Passivated (ASTM A967)
- Ground & Polished
- Natural / Mill Finish
JIS SUS890L Lock Washers Material Grade
- UNS N08904
- EN 1.4539
- ASTM 904L
- ASTM A240 / A276
INOX 904L Square Washers High-Nickel Structure
- Nickel: 23.00–28.00%
- Molybdenum: 4.00–5.00%
- Copper Added For Acid Duty
- Fully Austenitic, Non-Magnetic
SS 904L Fender Washers Testing Method
- PMI Testing
- Intergranular Corrosion Test
- Dimensional Check
- Third-Party Inspection
Stainless Steel 904L Square Washers Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
UNS N08904 Star Washers Origin
- Indian Origin
- Japanese Origin
- European Origin
- Traceable To Heat Number
Types Of SS 904L Washers
Trusted Stainless Steel 904L Washers Supplier in India, stocking various types of washers for any application
SS 904L Plain Washers
ASME B18.22.1
UNS N08904 Sealing Washers
Bonded Seal
EN 1.4539 Flat Washers
ISO 7089
ASTM 904L Spring Washers
DIN 127
JIS SUS890L Lock Washers
Twisted Tooth
INOX 904L Square Washers
DIN 436
AISI 904L Fender Washers
Wide OD
SS 904L Countersunk Washers
UNS N08904
Need A Custom SS 904L Washer Size Or Type?Share your drawing – get a factory-price quote within 24 hours.
UNS N08904 Plain Washers Manufacturing Process
Melting & Casting
AOD-melted billets locked to controlled 904L chemistry
Hot Forging & Rolling
Formed into bar and strip stock at controlled temperature
Blanking & Cold Forming
Precision punched and formed to the final washer profile
Solution Annealing
Heat treated to restore full corrosion resistance after forming
Passivation & Inspection
Acid-passivated, dimensionally checked, then packed for dispatch
Reliable UNS N08904 Conical and Lock Washers ISO Certified and Available at Best Price with Ex Stock and Zero MOQ
EN 1.4539 Fender Washers Size Chart
| Screw Size | Inner Ø (d1 min) | Outer Ø (d2 max) | Thickness (s) |
|---|---|---|---|
| M8 | 8.4 | 16 | 1.6 |
| M10 | 10.5 | 20 | 2.0 |
| M4 | 4.3 | 9 | 0.8 |
| M12 | 13.0 | 24 | 2.5 |
| M16 | 17.0 | 30 | 3.0 |
| M20 | 21.0 | 37 | 3.0 |
| M24 | 25.0 | 44 | 4.0 |
| M5 | 5.3 | 10 | 1.0 |
| M6 | 6.4 | 12 | 1.6 |
Specifying For A Sulfuric Acid Or Offshore Project?Send your BOQ – factory price, MTC 3.1, dispatch same week.
ASTM 904L Flat Washers Chemical Composition
NickelNi
23.00–28.00%
ChromiumCr
19.00–23.00%
MolybdenumMo
4.00–5.00%
CopperCu
1.00–2.00%
ManganeseMn
≤ 2.00%
SiliconSi
≤ 1.00%
CarbonC
≤ 0.020%
SulphurS
≤ 0.035%
IronFe
Balance
Weekly Delivery Of Stainless Steel 904L Washers In Below Countries
| Export To | Continent | Shipping Time | Ports |
|---|---|---|---|
| Netherlands | Europe | 30 Days | Manila |
| Kuwait | Asia | 10 Days | Shuaiba |
| Nigeria | Africa | 30 Days | Calabar |
Stainless Steel 904L Washers Monthly Delivery In Below Countries
| Export To | Continent | Shipping Time | Ports |
|---|---|---|---|
| Colombia | South America | 45 Days | Buenaventura |
| Morocco | Africa | 45 Days | Tanger Med |
Buying In Bulk For A Chloride-Heavy Environment?Send your BOQ – factory price, MTC 3.1, dispatch same week.
SS 904L Washers Vs SS 316L Washers
SS 316L Washers
- Nickel Content: 10.00–14.00%
- Molybdenum Content: 2.00–3.00%
- PREN Score: ≈ 25
- Fits general marine & chloride duty
SS 904L Washers
- Nickel Content: 23.00–28.00%
- Molybdenum Content: 4.00–5.00%
- PREN Score: ≈ 36
- Built for acid & severe chloride duty
Need A Grade That Outlasts 316L?904L handles what standard marine-grade washers cannot.
JIS SUS890L Spring Washers Mechanical Properties
Tensile Strength
≥ 490 MPa
Load Bearing
Yield Strength (0.2%)
≥ 220 MPa
Design Limit
Elongation (50mm)
≥ 35%
Ductility
Hardness
≤ 90 HRB
Wear Resistance
Get A Live SS 904L Washer Quote TodayFactory price, ready stock on standard sizes, and no minimum order penalty on repeat buyers.
SS 904L Split Washers Corrosion Resistance Rating
SS 904LPREN
≈ 36
INOX 904L Lock Washers Surface Coatings
Get high-performance coated products from our Stainless Steel 904L Washers Supplier in India
Bright Annealed – Standard Mill Finish
Electropolished – Maximum Corrosion Resistance
Passivated (ASTM A967) – Removes Free Iron
Mechanically Polished – Ra 0.4–0.8 µm
PTFE / Xylan Coated On Request
Natural Mill Finish – Cost-Effective Option
Comparing Grades For An Acid Or Marine Line?Share your operating media – we recommend the right grade.
SS 904L Fender Washers Weight Chart
| Screw Size | Weight / Pc (g) | Approx Pcs / Kg |
|---|---|---|
| M8 | 1.86 | ~538 |
| M10 | 3.64 | ~275 |
| M4 | 0.31 | ~3226 |
| M5 | 0.45 | ~2222 |
| M12 | 6.39 | ~156 |
| M16 | 11.52 | ~87 |
| M20 | 17.49 | ~57 |
| M6 | 1.04 | ~962 |
Stainless Steel 904L Square Washers HSN Code
HSN Heading
7318
Screws, bolts, nuts & washers of iron/steel
Plain / Flat Washer
7318 22 00
Non-threaded: other washers
Spring / Lock Washer
7318 21 00
Non-threaded: spring & lock washers
GST Rate
18%
Standard rate on stainless steel washers
UNS N08904 Star Washers Equivalent Grades
ASTM / ASME
- A240 / SA240
- A276
- A473
EN / DIN
- EN 10088-3
- 1.4539
- X1NiCrMoCu25-20-5
BS
- BS 1449
- 904S13
- BS EN 10088
JIS
- SUS 890L
- JIS G4303
- JIS G3446
IS
- IS 6911
- Grade UNS N08904
- IS 1570 (Part 5)
GB
- GB/T 20878
- 015Cr21Ni26Mo5Cu2
- GB/T 3280
EN 1.4539 Countersunk Washers Certification
NABL Lab Report
Every Stainless Steel 904L Washer dispatch travels with an NABL Lab Report, matched to the original heat number and cross-checked against ASTM A240 chemistry and mechanical limits before it leaves our Mumbai facility.
ASTM 904L Sealing Washers Packaging
Poly Bag & Carton
Retail-ready packing for small & trial orders
Wooden Pallet Box
For bulk quantities & container-load shipments
Export Vacuum Pack
Moisture-sealed for long-transit sea freight & humid ports
Custom Labelling
PO number, size & heat number marked per buyer requirement
Industrial Application Of Stainless Steel 904L Flat Washers
Sulfuric & Phosphoric Acid Plant Piping
Flue Gas Desulfurization Equipment
Offshore & Marine Seawater Systems
Pulp & Paper Bleaching Equipment
Chemical Tanker & Storage Tank Fittings
Desalination Plant Components
Food & Pharmaceutical Processing Equipment
Heat Exchanger & Condenser Assemblies
Frequently Asked Questions
What makes SS 904L Washer resist corrosion so well?
Loaded with extra nickel, molybdenum, and copper, this super-austenitic grade achieves a high PREN of ~36, effortlessly resisting chlorides and sulfuric acid.
What makes SS 904L Washer different from SS 316L Washer?
904L doubles the nickel and molybdenum of 316L, raising its PREN to 36 for superior resistance to strong acids and seawater.
What is the minimum order quantity?
Get a fast factory-direct quote from Ganpat Industrial for any quantity-from trial lots to full containers.
Our Dealers And Distributors Are Present In The Locations Mentioned Below
| Texas (USA) | California (USA) |
| Al Jubail (Saudi Arabia) | Dubai (UAE) |
| Dammam (Saudi Arabia) | Abu Dhabi (UAE) |
| Riyadh (Saudi Arabia) | Houston (USA) |
| Al Khobar (Saudi Arabia) | Indiana (USA) |
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