Why Do Leading Industries Rely on Ganpat Industrial for Stainless Steel 347 Washers ?
Niobium Locked, Not Titanium
Nb+Ta binds carbon harder, holding shape after thick-section welding
Rated Past 900°C
Outlasts standard austenitic grades in refinery & boiler duty
Every Profile, One Container
Fender, conical, sealing & lock types packed on a single BL
Heat-Batch Traceable
UNS S34700 heats recorded and matched to every dispatch
Stock Sizes Dispatch Same Week
Boxed, labelled and export-ready without waiting on production
Stainless Steel 347 Washer Overview
- 1Size Range: M2 to M36 • OD 5 mm to 66 mm • per ASTM A240
- 2Standards: ASME B18.22.1, DIN 125, DIN 127, DIN 6796, ISO 7089/7090
- 3Common Grades: UNS S34700, EN 1.4550, AISI 347, Werkstoff Nr. 1.4550
- 4Finish: Bright Annealed, Passivated, Polished, Natural Mill Finish
- 5Origin: Indian origin • Japanese origin • European origin
- 6Type: Plain, Spring, Fender, Sealing, Flat, Lock, Conical, Countersunk
Or call our Mumbai office: +91 22 6743 7134 • Same-week dispatch on ready stock sizes
Ganpat Industrial rolls out UNS S34700 Washer and EN 1.4550 Washer components for buyers who cannot risk carbide precipitation on heavy welded joints. Niobium and tantalum lock the carbon inside every Stainless Steel 347 Washer we forge, so refinery piping, superheater supports and thick pressure-vessel flanges keep their corrosion resistance long after the weld torch has cooled.
Mumbai · Forging Manufacturer & Exporter
Stainless Steel 347 Washers Built For Extreme Heat And Heavy Welded Joints
Ganpat Industrial manufactures and exports Stainless Steel 347 Washers for buyers whose equipment runs hotter and welds thicker – refinery piping, superheater supports, pressure vessels and turbine housings across India, the Gulf, Africa and Southeast Asia.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
Reliable AISI 347 Lock Washers Supplied from India Manufactured As Per Custom Specification With Ready Stock
Specification Of Stainless Steel 347 Washers
SS 347 Fender Washers Size Range
- ID: M2 – M36
- OD: 5 – 66 mm
- Thickness: 0.3 – 5 mm
- Custom sizes on drawing
UNS S34700 Conical Washers Standards
- ASME B18.22.1
- DIN 125 / DIN 127
- ISO 7089 / 7090 / 7091
- ISO 3506 (A4-70)
AISI 347 Flat Washers Production Route
- Precision Blanking
- CNC Punching
- Cold Forming (Spring/Conical)
- Deburring & Tumbling
EN 1.4550 Sealing Washers Surface Finish
- Bright Annealed
- Passivated (ASTM A967)
- Polished
- Natural / Mill Finish
DIN X6CrNiNb18-10 Lock Washers Material Grade
- UNS S34700
- EN 1.4550
- AISI 347
- ASTM A240
SUS 347 Spring Washers Niobium Stabilisation
- Nb+Ta: 10x(C+N) min – 1.10% max
- Stops chromium carbide loss
- Holds up on thick-section welds
- Stable up to 900°C
Stainless Steel 347 Plain Washers Testing Method
- PMI Testing
- High-Temperature Soak Test
- Dimensional Check
- Third-Party Inspection
SS 347 Split Washers Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
Stainless Steel 347 Sealing Washers Origin
- Indian Origin
- Japanese Origin
- European Origin
- Traceable To Heat Number
Types Of SS 347 Washers
SS 347 Fender Washers
Wide OD
UNS S34700 Conical Washers
DIN 6796
AISI 347 Flat Washers
ISO 7089
EN 1.4550 Sealing Washers
Bonded Seal
DIN X6CrNiNb18-10 Lock Washers
Twisted Tooth
SUS 347 Spring Washers
DIN 127
Stainless Steel 347 Plain Washers
ASME B18.22.1
INOX 347 Countersunk Washers
UNS S34700
Need A Custom SS 347 Washer Size Or Type?Share your drawing – get a factory-price quote within 24 hours.
UNS S34700 Spring Washers Size Chart
| Screw Size | Inner Ø (d1 min) | Outer Ø (d2 max) | Thickness (s) |
|---|---|---|---|
| M4 | 4.3 | 9 | 0.8 |
| M10 | 10.5 | 20 | 2.0 |
| M5 | 5.3 | 10 | 1.0 |
| M12 | 13.0 | 24 | 2.5 |
| M16 | 17.0 | 30 | 3.0 |
| M20 | 21.0 | 37 | 3.0 |
| M24 | 25.0 | 44 | 4.0 |
| M6 | 6.4 | 12 | 1.6 |
| M8 | 8.4 | 16 | 1.6 |
AISI 347 Lock Washers Vs SS 321 Split Washers
SS 321 Washers
- Stabiliser: Titanium
- Max Continuous Temp: ≈ 800°C
- Rockwell Hardness: 92 HRB
- Melting Point: 1446°C
SS 347 Washers
- Stabiliser: Niobium + Tantalum
- Max Continuous Temp: ≈ 900°C
- Rockwell Hardness: 95 HRB
- Melting Point: 1427°C
Specifying For A Refinery Or Boiler Project?Send your BOQ – factory price, MTC 3.1, dispatch same week.
Trusted EN 1.4550 Sealing Washers Available as Per Specification Keeping Ready to Dispatch Stock of PMI Tested Material with Verified Chemical Composition
EN 1.4550 Split Washers Chemical Composition
ChromiumCr
17.00–19.00%
NickelNi
9.00–13.00%
Niobium + TantalumNb+Ta
10x(C+N)–1.10%
ManganeseMn
≤ 2.00%
SiliconSi
≤ 0.75%
CarbonC
≤ 0.08%
PhosphorusP
≤ 0.045%
SulphurS
≤ 0.030%
IronFe
Balance
Buying In Bulk For A Thick-Wall Flange Or Vessel?Send your BOQ – factory price, MTC 3.1, dispatch same week.
DIN X6CrNiNb18-10 Square Washers Mechanical Properties
Tensile Strength
≥ 515 MPa
Load Bearing
Yield Strength (0.2%)
≥ 205 MPa
Design Limit
Elongation (50mm)
≥ 35%
Ductility
Hardness
≤ 201 HB / 92 HRB
Wear Resistance
Weekly Delivery Of Stainless Steel 347 Washers
| Export To | Continent | Port | Shipping Time |
|---|---|---|---|
| UAE | Asia | Port of Singapore | 11-50 Days |
| USA | North America | Port of Los Angeles | 30-45 Days |
| Italy | Europe | Port of Antwerp-Bruges | 20-54 Days |
Monthly Delivery Of Stainless Steel 347 Washers
| Export To | Continent | Port | Shipping Time |
|---|---|---|---|
| Germany | Europe | Port of Rotterdam | 20-45 Days |
| Spain | Europe | Port of Hamburg | 33-34 Days |
| Malaysia | Asia | Port of Shanghai | 19-23 Days |
Need Stock Delivered On A Weekly Schedule?Ready sizes ship every week to your regular port of call.
SUS 347 Slot Washers Weight Chart
| Screw Size | Weight / Pc (g) | Approx Pcs / Kg |
|---|---|---|
| M4 | 0.31 | ~3226 |
| M5 | 0.45 | ~2222 |
| M6 | 1.04 | ~962 |
| M12 | 6.39 | ~156 |
| M16 | 11.52 | ~87 |
| M20 | 17.49 | ~57 |
| M8 | 1.86 | ~538 |
| M10 | 3.64 | ~275 |
Get A Live SS 347 Washer Quote TodayFactory price, ready stock on standard sizes, and no minimum order penalty on repeat buyers.
Stainless Steel 347 Sealing Washers HSN Code
HSN Heading
7318
Screws, bolts, nuts & washers of iron/steel
Plain / Flat Washer
7318 22 00
Non-threaded: other washers
Spring / Conical Washer
7318 21 00
Non-threaded: spring & lock washers
GST Rate
18%
Standard rate on stainless steel washers
SS 347 Split Washers Price Factors
Get factory-direct competitive pricing from a leading Stainless Steel 347 Washers Manufacturer in India
Live Nickel & Niobium Index
Order Quantity & MOQ Slab
Size, OD & Wall Thickness
Surface Finish Selected
Testing & Certification Level
Freight & Incoterm Chosen
AISI 347 Fender Washers Material Testing
Verify quality with an Stainless Steel 347 Washers Supplier in India using PMI and hardness testing
PMI Testing
Positive Material Identification on every lot to confirm grade & niobium content
High-Temperature Soak Test
Verifies resistance to sensitisation after simulated heat cycling
Dimensional Check
OD, ID & thickness verified against drawing tolerance
Visual & Surface Check
Screened for burrs, scale & finish defects
Hardness Test
Confirms annealed condition meets ASTM A240 limits
Third-Party Inspection
TPI available on request for large export orders
Need Mill Test Certificates With Your Order?Every dispatch ships with EN 10204 3.1 documentation.
UNS S34700 Flat Washers Certification
Mill Test Certificate 3.1
Every Stainless Steel 347 Washer dispatch travels with an EN 10204 3.1 Mill Test Certificate, matched to the original heat number and cross-checked against ASTM A240 chemistry and mechanical limits before it leaves our Mumbai facility.
SS 347 Plain Washers Equivalent Grades
ASTM / ASME
- A240 / SA240
- A276
- A182 F347
- A473
EN / DIN
- EN 10088-3
- 1.4550
- X6CrNiNb18-10
BS
- BS 1449
- 347S17 / 347S31
- BS EN 10088
JIS
- SUS 347
- JIS G4303
- JIS G3446
IS
- IS 6911
- Grade UNS S34700
- IS 1570 (Part 5)
GB
- GB/T 20878
- 06Cr18Ni11Nb
- GB/T 3280
EN 1.4550 Countersunk Washers Packaging
Ensure safe transit with rust-proof seaworthy packaging from an Stainless Steel 347 Washers Supplier in India
Poly Bag & Carton
Standard 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 climates
Custom Labelling
PO number, size & heat number marked per buyer requirement
Application Of Stainless Steel 347 Star Washers
Refinery & Petrochemical Piping
High-Pressure Boiler & Superheater Tubing
Heavy-Wall Welded Pressure Vessels
Power Plant & Turbine Components
Aerospace & High-Temperature Fittings
Furnace & Heat-Treatment Equipment
Expansion Bellows & Exhaust Joints
Pulp & Paper Digester Equipment
Frequently Asked Questions
What makes SS 347 Washer different from SS 321 Washer?
By swapping titanium for niobium, grade 347 handles heat above 550°C and thick welds better than 321, making it the preferred choice for refineries and boilers.
What does niobium stabilisation actually do?
Niobium locks up carbon before chromium does, leaving chromium free to stop corrosion along heavy, multi-pass welds.
Is SS 347 Washer magnetic?
In the annealed state, SS 347 washers are non-magnetic, though heavy cold working can induce slight magnetism.
What is the minimum order quantity?
Ganpat Industrial supplies from small trial lots to full container loads – share your size and quantity for a factory-price quote.
We Collaborate With Traders In The Following Locations
| Morocco | Kenya | Gabon | Houston | Dubai | Tunisia |
| Abu Dhabi | South Africa | Nigeria | Mozambique | USA | Oman |
| Saudi Arabia | Riyadh | Dammam | Al-khobar | UAE | Al Jubail |
| Angola | Ethiopia | Egypt | Zambia | Ghana | Tanzania |
| New South Wales | Indiana | Texas | California | Algeria | Carolina |
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