When Ordinary Washers Give Up To Heat, Why Plants Turn To Ganpat’s Stainless Steel 310H Washers ?
One PO, Every Profile
Flat, lock, spring, conical & sealing – consolidated in a single shipment
Grain Size Verified
ASTM No. 7 or coarser confirmed on every heat before dispatch
Carbon Locked For Creep Strength
0.04–0.10% controlled carbon – not a generic low-carbon melt
Full Heat Traceability
UNS S31009 chemistry matched to EN 10204 3.1 on request
Rated For Sustained Duty
Holds allowable stress well beyond where 310S de-rates
Stainless Steel 310H Washer Technicalities
- 1Profiles: Flat, Lock, Spring, Sealing, Conical, Square, Star, Slot, Split Lock, Countersunk
- 2Grades: UNS S31009, EN 1.4845, AISI/ASTM 310H
- 3Sustained Service Temp: Design-rated for continuous duty above 800°C
- 4Standards: ASTM A240, ASME SA240, ASME B18.22.1, EN 10088-2, ISO 7089
- 5Carbon Band: 0.04–0.10% – the “H” that separates it from 310 / 310S
- 6Size Range: M2 to M36 • OD 5 mm to 66 mm
Or call our Mumbai office: +91 22 6743 7134 • Same-week dispatch on ready-stock sizes
Ganpat Industrial manufactures Stainless Steel 310H Washers from certified high-carbon 25Cr-20Ni raw material (UNS S31009 / EN 1.4845), precision blanked, cold formed and stress relieved into flat, lock, spring, sealing, conical, square, star, slot, split lock and countersunk profiles. The controlled 0.04–0.10% carbon band is what separates the “H” designation from standard 310 or 310S, giving these washers reliable creep strength for continuous service above 800°C where lower-carbon grades lose their clamp load. Manufactured to ASTM A240, ASME SA240, ASME B18.22.1, EN 10088-2 and ISO 7089, and available across M2 to M36 with outer diameters from 5 mm to 66 mm, including non-standard sizes built to drawing. Every heat carries chemistry and mechanical test back-up before dispatch, making these washers a standard choice for furnace, kiln, boiler and high-temperature process equipment across India and export markets.
Mumbai · Forging Manufacturer & Exporter
Stainless Steel 310H Washers Rated For Round-The-Clock High-Heat Duty
Ganpat Industrial supplies Stainless Steel 310H Washers to buyers running non-stop high-temperature operations – furnace contractors, boiler manufacturers and reformer-tube fabricators across India, the UAE and the Middle East who need joints that hold through sustained heat cycles without creep-related failure.
- ✓ISO 9001:2015
- ✓ISO 14001:2015
- ✓OHSAS 18001:2007
- ✓PED Certified
- ✓Petrofac Approved
Leading Manufacturer Of ASTM 310H Flat Washers in India With Reliable Specification and Genuine MTC
Specification Of Stainless Steel 310H Washers
SS 310H Flat Washer Country Of Origin
- Indian Origin
- Japanese Origin
- European Origin
- Traceable To Heat Number
310H Stainless Steel Fender Washer Grade Traceability
- UNS S31009
- EN 1.4845
- AISI / ASTM 310H
- Heat-Number Marked
INOX 310H Spring Washer Packaging Method
- Poly Bags × Cartons
- Wooden Pallet Crates
- Vacuum Pack (export)
- Custom Labelling
310H SS Lock Washer Size Range
- ID: M2 – M36
- OD: 5 – 66 mm
- Thickness: 0.3 – 6 mm
- Custom sizes on drawing
SUS 310H Countersunk Washer Testing Protocol
- PMI Testing
- Grain Size Check
- Dimensional Inspection
- Third-Party Inspection
Stainless Steel 310H Plain Washer Surface Finish Options
- Bright Annealed
- Passivated (ASTM A967)
- Mechanically Polished
- Natural Mill Finish
UNS S31009 Star Washer Governing Standards
- ASTM A240 / ASME SA240
- ASME B18.22.1
- EN 10088-2 / ISO 7089
- DIN 125 / DIN 127
AISI 310H Conical Washer Documentation Set
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
EN 1.4845 Sealing Washer Production Route
- Precision Blanking
- CNC Punching
- Cold Forming (Spring/Lock)
- Deburring & Tumbling
Best Price of ASME SA193 Stainless Steel 310H Fender Washers Having Precise Dimensions With Verified PMI Testing
Testing Methods Of SUS 310H Slot Washers
Identify an Stainless Steel 310H Washers Supplier in India providing complete PMI and Hardness testing reports
Third-Party Inspection
TPI witness available on request before dispatch
Grain Size Verification
Confirms ASTM No. 7 or coarser for creep strength
PMI Testing
Confirms Cr, Ni & alloy content on the shop floor
Creep-Rupture Data Review
Batch chemistry checked against code creep tables
Dimensional Check
ID, OD & thickness verified against drawing
Intergranular Corrosion (IGC)
Screens for sensitisation risk near the carbon ceiling
AISI 310H Conical Washers Dimension Chart
Thickness Band
0.3–6.0mm
Standard punched to heavy-duty gauge
Large
M20–M36
ID approx. 21–37mm • OD 37–66mm
Small
M2–M6
ID approx. 2.2–6.4mm • OD 5–12mm
Medium
M8–M16
ID approx. 8.4–17mm • OD 16–30mm
Surface Finish Techniques For EN 1.4845 SS 310H Spring Washers
Mechanical Polishing
Ra 0.4–0.8 µm for hygienic or visible assemblies
Electropolishing
Ultra-clean surface for cleanroom or pharma-grade joints
Natural Mill Finish
As-rolled, economical for hidden structural fixings
Pickling & Passivation
Strips embedded iron, restores the chromium oxide layer
Bright Annealing
Scale-free mirror finish for exposed process joints
Shot Blasting
Uniform matte texture, clears mill scale ahead of coating
Looking For A Custom 310H Washer Profile Or Size?Send your drawing – receive a factory-direct quote within 24 hours.
Stainless Steel 310H Star Washers Manufacturing Process
Raw Material Verification
Every 310H coil is checked for carbon band and PMI-confirmed before entering production
CNC Blanking
Washers punched to exact ID/OD tolerances against the buyer’s drawing
Profile Forming
Conical, spring, lock and star geometries cold-formed to specification
Surface Treatment
Deburred, tumbled and acid-passivated for a clean, corrosion-resistant surface
Quality Sign-Off & Dispatch
Grain size, dimensional and PMI checks completed before the batch ships
Types Of SS 310H Washers
Stainless Steel 310H Flat Washer
ISO 7089
SS 310H Lock Washer
DIN 127
UNS S31009 Sealing Washer
Bonded Seal
EN 1.4845 Plain Washer
DIN 125
AISI 310H Spring Washer
DIN 137
SUS 310H Square Washer
Square Profile
310H SS Countersunk Washer
Tapered Seat
Stainless Steel 310H Star Washer
Internal Tooth
INOX 310H Slot Washer
Slotted
310H Stainless Steel Split Lock Washer
Split Ring
SS 310H Conical Washer
DIN 6796
310H Stainless Steel Fender Washer
Wide OD
Verifying A 310H Spec Against A Specific Buyer Standard?Send us the reference – we’ll match it to the correct Ganpat data sheet the same day.
SUS 310H Fender Washers Weight Chart
Get precise dimensional weights and thickness metrics from an Stainless Steel 310H Washers Supplier in India
| Sizes | Inner Diameter (ID) | Outer Diameter (OD) | Washer Thickness |
|---|---|---|---|
| 7/8″ | 0.937″ | 2″ | 0.109″ |
| #10 | 0.203″ | 0.437″ | 0.050″ |
| 1-3/4″ | 1.812″ | 3-1/2″ | 0.140″ |
| #4 | 0.125″ | 0.312″ | 0.031″ |
| 1/2″ | 0.531″ | 1-1/4″ | 0.062″ |
| 1-1/4″ | 1.312″ | 2-3/4″ | 0.125″ |
| 5/16″ | 0.343″ | 3/4″ | 0.050″ |
| 2″ | 2.125″ | 4″ | 0.187″ |
| #8 | 0.174″ | 0.375″ | 0.031″ |
| 9/16″ | 0.625″ | 1-3/8″ | 0.078″ |
| 1″ | 1.062″ | 2″ | 0.125″ |
| 3/8″ | 0.406″ | 7/8″ | 0.050″ |
| 1-1/2″ | 1.562″ | 3-1/4″ | 0.140″ |
| #6 | 0.150″ | 0.312″ | 0.031″ |
| 3/4″ | 0.812″ | 1-7/8″ | 0.109″ |
| 7/16″ | 0.500″ | 1-1/8″ | 0.062″ |
| 1-3/8″ | 1.500″ | 3-1/4″ | 0.140″ |
| #12 | 0.250″ | 9/16″ | 0.050″ |
| 1/4″ | 0.281″ | 5/8″ | 0.050″ |
| 1-1/8″ | 1.187″ | 2-1/2″ | 0.125″ |
| 5/8″ | 0.687″ | 1-1/2″ | 0.078″ |
Scheduling A Cracker Furnace Turnaround?Share your BOQ – get factory pricing, 3.1 MTC, and dispatch within the week.
INOX 310H Flat Washers Equivalent Grades
EN / DIN (Europe)
- 1.4845
- X8CrNi25-21
- DIN 17440
IS (India)
- Grade 310H
- IS 6911
- IS 1570 (Part 5)
JIS (Japan)
- SUH 310 / SUS310H
- JIS G4312
- JIS G3463
GB (China)
- 06Cr25Ni20 (H)
- GB/T 1220
- GB/T 20878
ASTM / ASME (USA)
- A240 / A276 Type 310H
- A312 TP310H
- UNS S31009
BS (Britain)
- 310S31H
- BS EN 10095
- BS 970
SS 310H Spring Washers Chemical Composition
SulphurS
≤ 0.030%
ChromiumCr
24.00–26.00%
CarbonC
0.04–0.10%
IronFe
Balance
ManganeseMn
≤ 2.00%
PhosphorusP
≤ 0.045%
NickelNi
19.00–22.00%
SiliconSi
≤ 1.50%
SUS 310H Plain Washers Mechanical Properties
Tensile Strength
≥ 515 MPa
Load Bearing
Yield Strength (0.2%)
≥ 205 MPa
Design Limit
Elongation (50mm)
≥ 40%
Ductility
Grain Size (ASTM)
No. 7 Or Coarser
Creep Strength
AISI 310H Sealing Washers Price List Factors
◆Profile Type (Flat / Lock / Spring)
◆Size & Thickness
◆Surface Finish
◆Testing & MTC Requirement
◆Order Quantity
Get a live SS 310H Washer quote todayFactory pricing, ready stock on standard sizes, and no MOQ penalty for repeat buyers.
Applications Of SS 310H Spring Washers
Waste Heat Recovery Units
Sintering & Calcination Kilns
Refinery Process Heater Joints
Reformer Tube Hanger Assemblies
Boiler Superheater Fasteners
Heat-Treatment Furnace Fixtures
Ammonia & Urea Plant Piping
Ethylene Cracker Furnace Supports
ASTM 310H Flat Washers Temperature Range
Continuous Service
Up To 1035°C
Sustained oxidation resistance, same as 310 family
Code Allowable Stress
Qualified > 815°C
Higher ASME Sec. II Part D allowable than 310S
Creep-Rupture Basis
Carbon + Grain Size
Both locked to slow long-term deformation
Cryogenic Limit
Down To -196°C
Remains ductile at low temperature too
INOX 310H Star Washers Test Certificates
Third-Party Inspection Certificate
For export and large orders, an independent inspection agency verifies dimensions, chemistry and marking against the buyer’s PO before the batch is released for shipment.
Stainless Steel 310H Washers Delivered Weekly To The Following Countries
| Export To | Countries | Continent | Shipping Time (Days) | Ports |
|---|---|---|---|---|
| Kuwait | Asia | 8 | Shuaiba | |
| Saudi Arabia | Asia | 6 | Dammam | |
| Oman | Asia | 5 | Salalah | |
| Qatar | Asia | 7 | Doha | |
| UAE | Asia | 4 | Jebel Ali |
Monthly Delivery Of ASME SA193 Stainless Steel 310H Fender Washers To Below Countries
| Export To | Countries | Continent | Shipping Time (Days) | Ports |
|---|---|---|---|---|
| USA | North America | 30 | Houston | |
| Germany | Europe | 26 | Hamburg | |
| South Africa | Africa | 27 | Durban | |
| Egypt | Africa | 16 | Damietta | |
| Netherlands | Europe | 24 | Rotterdam |
AISI 310H Split Washers HSN Code
Correct classification from our Stainless Steel 310H Washers Manufacturer in India to keep GST filing clean
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
Documentation Of SS 310H Fender Washers
Commercial Invoice
PO-matched invoice with HSN & GST breakup
Every Order
Certificate Of Origin
For customs clearance & import duty processing
Export Orders
NABL Lab Report
Independent chemistry, mechanical & grain-size results
On Request
Packing List
Itemised piece count, weight & carton breakup
Every Order
Packaging For ASTM 310H Flat Washers
Custom Labelling
Buyer part number, PO reference & heat number printed
Wooden Pallet Crating
Fumigated pallets for safe forklift handling
Poly Bag Bundling
Counted, sealed bundles by size to prevent mix-ups
Vacuum Sealing (Export)
Moisture-proof sealing for long sea transit
Carton Boxing
Weight-checked cartons with size & heat labels
Frequently Asked Questions
What sizes of 310H washers do you supply?
From M3 to M64, plus custom OD/ID/thickness as per your drawing.
What temperature range can these washers withstand?
Rated for continuous service up to 1150°C, ideal for furnace and high-heat applications.
Do you supply washers as per DIN, ASTM or IS standards?
Yes – DIN 125, DIN 9021, ASTM F844 and IS standards, or custom specs on request.
Can you provide mill test certificates with the order?
Yes, every batch ships with MTC as per EN 10204 3.1.
What is the minimum order quantity?
None fixed – trial lots to full container loads are welcome.
Explore Nearby Locations For The Quickest Delivery Options
| Texas | California | Gujarat | Maharashtra | Tamil Nadu | Rajasthan |
| Cairo | Alexandria | Lagos | Nairobi | Casablanca | Algiers |
| Doha | Kuwait City | Manama | Riyadh | Jeddah | Yanbu |
| Houston | New Jersey | Rotterdam | Antwerp | Hamburg | Singapore |
| Muscat | Sohar | Dammam | Jubail | Abu Dhabi | Sharjah |
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