What Makes Ganpat Industrial The Preferred SS 317 Washer Supplier ?
High-Alloy, Mill-Direct
3–4% molybdenum heats sourced straight from the mill
One Enquiry, Full Range
Flat • Lock • Spring • Sealing — all in one PO
Chloride-Grade Certified
ISO 9001 • PED • NACE MR0175 heats on request
Pitting-Test Verified
PMI • salt spray • dimensional — checked before it ships
Quote In 24 Hours
Ready stock on standard sizes — ships same week
317 Stainless Steel Washer Overview
- 1Type: Flat, Lock, Spring, Sealing, Conical, Fender, Plain, Square, Machine, Star, Slot
- 2Size Range: M2 to M36 • OD 5 mm to 66 mm • per ISO 7089
- 3Common Grades: UNS S31700, EN 1.4449, AISI 317, Werkstoff Nr. 1.4449
- 4Finish: Bright Annealed, Passivated, Polished, Natural Mill Finish
- 5Standards: ASTM A240, ASME B18.22.1, DIN 125, DIN 127, ISO 7089, ISO 7090
- 6Origin: Indian origin • European origin • Japanese origin
Or call our Mumbai office: +91 22 6743 7134 • Fast dispatch on ready stock sizes
Stainless Steel 317 Washers carry a higher chromium, nickel and molybdenum load than any 300-series grade in regular stock — the extra molybdenum is what stops pitting and crevice attack when 304 or 316 grade rings would already be failing. Ganpat Industrial forges every EN 1.4449 / UNS S31700 washer in-house from mill-certified raw material, then blanks, punches or cold-forms it into the exact ring, disc or seal your drawing calls for. Buyers running flue-gas desulfurization units, acid storage tanks, offshore platforms and pulp & paper lines choose SS 317 over 316 specifically because ordinary chloride and sulphuric-acid exposure is not “mild” for their process. Ganpat Industrial Corporation is a Mumbai-based manufacturer and exporter with over 25 years in stainless steel fasteners, shipping ready stock and custom-drawing orders across India
Mumbai · Stainless Steel 317 Washers Manufacturer India
SS 317 Washers Built For Chlorides, Acids And Sites Where 316 Grade Already Struggles
Ganpat Industrial forges and supplies UNS S31700 / EN 1.4449 Washers for buyers running flue-gas scrubbers, acid storage, offshore platforms and pulp & paper plants across India, the UAE and the Middle East.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
SS 317 Flat & Spring Washers Manufacturer & Exporter in India as Per DIN Standard
Stainless Steel 317 Washers Specification
317 Grade Star Washer Material
- UNS S31700
- EN 1.4449
- AISI 317
- ASTM A240
SS 317 Slot Washer Testing
- PMI Testing
- Salt Spray Test
- Dimensional Check
- Third-Party Inspection
Stainless Steel 317 Flat Washer Origin
- Indian Origin
- European Origin
- Japanese Origin
- Traceable To Heat Number
UNS S31700 Sealing Washer Size Range
- ID: M2 – M36
- OD: 5 – 66 mm
- Thickness: 0.3 – 5 mm
- Custom sizes on drawing
INOX 317 Plain Washer Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
EN 1.4449 Machine Washer Surface Finish
- Bright Annealed
- Passivated (ASTM A967)
- Polished
- Natural / Mill Finish
AISI 317 Square Washer Production Route
- Precision Blanking
- CNC Punching
- Cold Forming (Spring/Lock)
- Deburring & Tumbling
SS 317 Fender Washer Governing Standard
- ASTM A240
- ASME B18.22.1
- DIN 125 / DIN 127
- ISO 7089 / 7090 / 7091
Types Of Stainless Steel 317 Washers
UNS S31700 Flat Washer
ISO 7089
ASTM SS 317 Lock Washer
DIN 127
SS 317 Sealing Washer
Bonded Seal
EN 1.4449 Spring Washer
DIN 137
SS 317 Conical Washer
DIN 6796
317 Stainless Steel Fender Washer
Wide OD
AISI 317 Plain Washer
ASME B18.22.1
INOX 317 Square Washer
Square Plate
EN 1.4449 Machine Bush Washer
Machine Bush
SS 317 Toothed Star Washer
Serrated
UNS S31700 Slotted Disc
Slotted
SS 317 Split Lock Ring
Split Lock
Need A Custom 317 Grade Ring Or Disc Size?Share your drawing — get a factory-price quote within 24 hours.
SS 317 vs SS 316 Plain Washer
Choose By Corrosion Load, Not By Habit
SS 316 Washer
- Density: ≈ 8.00 g/cm³
- Melting Range: 1375–1400°C
- Tensile Strength: ≥ 515 MPa
- PREN (Pitting Index): ~24
- Relative Cost Index: 1.0x (Base)
SS 317 Washer
- Density: ≈ 7.95 g/cm³
- Melting Range: 1400–1440°C
- Tensile Strength: ≥ 515 MPa
- PREN (Pitting Index): ~28–30
- Relative Cost Index: 1.15x–1.35x
ISO 9001 Certified UNS S31700 Washers Manufacturer In India With Custom Dimensions
UNS S31700 Star Washer Dimension Chart
As a trusted Stainless Steel 317 Washers Supplier in India, we maintain precise inner diameter, outer diameter and thickness for every size
| Bolt Size | SAE | USS | ||||
|---|---|---|---|---|---|---|
| Thickness | ID (in.) | OD (in.) | Thickness | ID (in.) | OD (in.) | |
| 5/32 (#8) | .036/.065 | 0.188 | 0.438 | – | – | – |
| 1/8 (#6) | .036/.065 | 0.156 | 0.375 | – | – | – |
| 7/32 (#12) | .051/.080 | 0.250 | 0.562 | – | – | – |
| 3/16 (#10) | .036/.065 | 0.220 | 0.500 | .036/.065 | 0.250 | 0.560 |
| 5/16 | .051/.080 | 0.344 | 0.688 | .064/.104 | 0.375 | 0.875 |
| 1/4 (#14) | .051/.080 | 0.281 | 0.625 | .051/.080 | 0.312 | 0.734 |
| 7/16 | .051/.080 | 0.469 | 0.922 | .064/.104 | 0.500 | 1.250 |
| 3/8 | .051/.080 | 0.406 | 0.812 | .064/.104 | 0.438 | 1.000 |
| 9/16 | .074/.121 | 0.594 | 1.156 | .086/.132 | 0.625 | 1.469 |
| 1/2 | .074/.121 | 0.531 | 1.062 | .086/.132 | 0.562 | 1.375 |
| 3/4 | .108/.160 | 0.812 | 1.469 | .122/.177 | 0.812 | 2.000 |
| 5/8 | .074/.121 | 0.656 | 1.312 | .108/.160 | 0.688 | 1.750 |
| 1 | .108/.160 | 1.062 | 2.000 | .136/.192 | 1.062 | 2.500 |
| 7/8 | .108/.160 | 0.938 | 1.750 | .136/.192 | 0.938 | 2.250 |
| 1 1/4 | .136/.192 | 1.375 | 2.500 | .136/.192 | 1.375 | 3.000 |
| 1 1/8 | .108/.160 | 1.250 | 2.250 | .136/.192 | 1.250 | 2.750 |
| 1 1/2 | .153/.213 | 1.625 | 3.000 | .153/.213 | 1.625 | 3.500 |
| 1 3/8 | .136/.213 | 1.500 | 2.750 | .153/.213 | 1.500 | 3.250 |
| 1 3/4 | – | – | – | .153/.213 | 1.875 | 4.000 |
| 1 5/8 | – | – | – | .153/.213 | 1.750 | 3.750 |
| 2 | – | – | – | .153/.213 | 2.125 | 4.500 |
| 1 7/8 | – | – | – | .153/.213 | 2.000 | 4.250 |
| 2 1/2 | – | – | – | .210/.280 | 2.625 | 5.000 |
| 2 1/4 | – | – | – | .320/.248 | 2.375 | 4.750 |
| 3 | – | – | – | .249/.327 | 3.125 | 5.500 |
| 2 3/4 | – | – | – | .228/.410S | 2.875 | 5.250 |
317 Stainless Steel Slot Washer Weight
| APPROX. WEIGHT IN KGS FOR 100 NOS | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SIZE | MACHINED WASHER | HEAVY WASHER | SQUARE | TAPER | WASHERS | PLAIN PUNCHED WASHER | SPRING WASHER SQUARE SECTION | SPRING WASHER FLAT SECTION | PLAIN PUNCHED WASHER | Size (Inches) | |||
| MACHINED | HIGH- STRENGTH FRICTION- GRIP |
||||||||||
| FOR CHANNELS |
FOR I-BEAM |
TYPE-B (CHANNELS) |
TYPE-C ( I-BEAMS ) |
||||||||
| M-4 | – | – | – | – | – | – | – | 0.02 | 0.02 | – | – |
| M-3 | – | – | – | – | – | – | – | 0.01 | 0.01 | – | – |
| M-8 | 0.21 | – | 1.10 | 1.20 | – | – | 0.20 | 0.11 | 0.16 | 0.35 | 5/16" |
| M-6 | 0.11 | – | – | – | – | – | 0.11 | 0.04 | 0.08 | 0.21 | 1/4" |
| M-14 | – | – | – | – | – | – | 0.82 | 0.38 | 0.60 | – | – |
| M-12 | 0.62 | 1.90 | 2.00 | 2.20 | 2.00 | 1.80 | 0.58 | 0.23 | 0.38 | 1.07 | 1/2" |
| M-20 | 1.72 | 4.40 | 5.80 | 6.70 | 8.50 | 8.00 | 1.64 | 1.23 | 1.52 | 2.91 | 3/4" |
| M-18 | – | – | – | – | – | – | 1.27 | 0.66 | 0.97 | – | – |
| M-27 | 4.23 | 8.00 | 12.50 | 15.00 | 12.00 | 11.50 | 3.94 | 2.06 | 2.87 | 7.69 | 1.1/8" |
| M-24 | 3.30 | 6.30 | 13.50 | 16.00 | 6.50 | 6.00 | 3.11 | 1.81 | 2.62 | 6.13 | 1" |
| M-36 | 9.20 | 14.60 | 25.50 | 29.20 | 26.50 | 26.00 | 8.73 | 5.25 | 6.73 | 17.24 | 1.1/2" |
| M-33 | 7.54 | 12.00 | 21.00 | 23.50 | 23.00 | 22.50 | 7.10 | 3.50 | 6.30 | – | – |
| M-45 | 22.00 | 22.20 | – | – | – | – | 21.20 | 8.53 | 11.70 | – | – |
| M-42 | 18.30 | 20.10 | – | – | – | – | 17.50 | 8.00 | 11.10 | – | – |
| M-56 | – | – | – | – | – | – | 47.90 | – | 19.30 | – | – |
| M-52 | 33.00 | – | – | – | – | – | 31.90 | – | 18.20 | – | – |
| M-68 | – | – | – | – | – | – | 57.40 | – | – | – | – |
| M-64 | – | – | – | – | – | – | 55.40 | – | 21.80 | – | – |
What Actually Moves The Price
◆Order Quantity
◆Type (Flat / Lock / Spring)
◆Finish & Testing
Get a live SS 317 Washer quote todayFactory price, ready stock on standard sizes, and no minimum order penalty on repeat buyers.
EN 1.4449 Flat Washer Chemical Composition
Per ASTM A240 / UNS S31700
Chromium
18.00–20.00%
Nickel
11.00–15.00%
Molybdenum
3.00–4.00%
Manganese
≤ 2.00%
Silicon
≤ 0.75%
Carbon
≤ 0.08%
Nitrogen
≤ 0.10%
Phosphorus
≤ 0.045%
Sulphur
≤ 0.030%
Iron
Balance
ASTM SS 317 Washer Mechanical Properties
Annealed Condition
Tensile Strength(MPa)
≥ 515
Load Bearing
Yield Strength (MPa) (0.2%)
≥ 205
Design Limit
Elongation (50mm)
≥ 35%
Ductility
Hardness
≤ 217 HB / 95 HRB
Wear Resistance
ASTM SS 317 Lock Washer HSN Code
HSN Heading
7318
Screws, bolts, nuts & washers of iron/steel
Flat / Plain 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
EN 1.4449 Washer Equivalent Grades
ASTM / ASME
- A240 / SA240
- A276
- A182 F317
- A479
EN / DIN
- EN 10088-2
- 1.4449
- X2CrNiMo18-14-3
BS
- BS 1449
- 317S12 / 317S16
- BS EN 10088
JIS
- SUS 317
- JIS G4303
- JIS G3446
IS
- IS 6911
- Grade UNS S31700
- IS 1570 (Part 5)
GB
- GB/T 3280
- 06Cr19Ni13Mo3
- GB/T 20878
317 Grade Spring Washer Test Certificates
Mill Test Certificate 3.1
Every SS 317 Washer dispatch is issued with an EN 10204 3.1 Mill Test Certificate, traceable to the original heat number and cross-checked against ASTM A240 chemistry and mechanical limits before it leaves the factory.
UNS S31700 Flat Washers Material Testing
Being a reliable Stainless Steel 317 Washers Supplier in India, we test every batch for dimensional accuracy, PMI and material certification before dispatch
PMI Testing
Positive Material Identification on every lot to confirm molybdenum content
Salt Spray Test
Pitting & crevice resistance verified per ASTM B117
Dimensional Check
OD, ID & thickness verified against drawing tolerance
Hardness Test
Confirms annealed condition meets ASTM A240 limits
Visual & Surface Check
Screened for burrs, pitting & finish defects
Third-Party Inspection
TPI available on request for large export orders
Buying In Bulk For A Project?Send your BOQ — factory price, MTC 3.1, dispatch same week.
SS 317 Conical Washer Documentation
NABL Lab Report
Independent chemistry & mechanical test results
On Request
Packing List
Itemised piece count, weight & carton breakup
Every Order
Certificate Of Origin
For customs clearance & import duty processing
Export Orders
Commercial Invoice
PO-matched invoice with HSN & GST breakup
Every Order
AISI 317 Plain Washers Export Packaging
Poly Bag & Carton
Standard retail-ready packing for small orders
Wooden Pallet Box
For bulk quantities
Export Vacuum Pack
Moisture-sealed for long-transit sea freight
Custom Labelling
PO number marked per buyer requirement
Application Of Stainless Steel 317 Machine Washer
As a well-known Stainless Steel 317 Washers Manufacturer in India, our washers perform reliably in every application
Flue Gas Desulfurization (FGD)
Chemical & Petrochemical Plants
Marine & Offshore Platforms
Pulp & Paper Mills
Pharma & Biotech Skids
Food & Beverage Plants
Seawater Desalination Units
Acid Storage Tank Assembly
Have A Chloride Or Acid-Duty Joint To Solve?Tell us the environment — we recommend grade, finish & testing.
Stainless Steel 317 Washers Delivered Weekly to the Following Countries
| Export to | Countries | Continent | Ports | Shipping time |
|---|---|---|---|---|
 |
UAE | Asia | Mina Rashid | 5 days |
 |
Thailand | Asia | Laem Chabang | 7 |
 |
Germany | Europe | Bremerhaven | 20 |
Monthly Delivery of Stainless Steel 317 Washers to Below Countries
| Export to | Countries | Continent | Ports | Shipping time |
|---|---|---|---|---|
 |
Saudi Arabia | Asia | Jubail | 7 |
 |
Italy | Europe | Genoa | 30 |
Frequently Asked Questions
Is an SS 317 Washer magnetic?
No. SS 317 Washer is non-magnetic because of its austenitic structure.
Can SS 317 Washers be used in seawater?
Yes. The higher molybdenum content makes 317 better suited for seawater.
What is the minimum order quantity?
Ganpat Industrial supplies from small trial lots to full container loads, share size and quantity for a factory-price.
Discover Our Ready Inventory in These Country
| Gabon | Ethiopia | Zambia | Morocco | Ghana |
|---|---|---|---|---|
| Tunisia | New South Wales | Mozambique | – | Egypt |
| Nigeria | Saudi Arabia | UAE | South Africa | Oman |
| Angola | USA | Algeria | Tanzania | Kenya |
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