DIN 125A/B · ISO 7089 · ASME B18.22.1
Plain Flat Washers
Designed to distribute threaded fastener loads evenly over joint surfaces, preventing surface distortion in piping, structural steel, and machinery.
Manufacturing Expertise
Premium Industrial Washers Exporter & Manufacturer
Stud Bolt India is a globally recognized manufacturer and supplier of engineered industrial washers. We produce precision-stamped and CNC-machined washers designed to withstand extreme joint pressure, vibration, thermal expansion, and aggressive chemical exposure.
Our engineering facility in Mumbai utilizes high-tonnage precision presses, heat treatment furnaces, and automated deburring units to manufacture standard and custom washers. Every washer spreads clamping loads evenly, protects joint contact surfaces, prevents fastener loosening under dynamic operation, and maintains tight seal integrity in critical piping and structural assemblies.
Material Verification
100% Spectrometer PMI testing on incoming raw coils and plates.
EN 10204 3.1 Certified
Full physical, mechanical, and chemical mill test documentation.
Tight Tolerances
Manufactured to strict DIN, ISO, ASTM, and ASME dimensional limits.
Anti-Corrosion Finishes
PTFE/Xylan, Hot-Dip Galvanized, Zinc-Nickel, and Cadmium options.
Product Range
Comprehensive Range of Industrial Washers
Engineered for high-pressure flange connections, structural steelwork, turbines, subsea pipelines, and chemical processing equipment.
DIN 127B · DIN 7980 · ASME B18.21.1
Spring Lock Washers
Helical split lock washers that provide continuous spring tension to absorb vibration and prevent bolt tension loss under dynamic loading.
DIN 25201 · Pair-Locking System
Wedge Lock Washers
Cam-locking dual washer pairs that secure bolted joints through tension rather than friction, ideal for heavy machinery and mining duty.
ASTM F436 / F436M · Hardened Steel
Structural Washers (ASTM F436)
Through-hardened steel flat washers engineered for use with high-strength structural bolts (A325 and A490) in bridges and steel structures.
ASME B18.22.1 · Custom Thickness
Square & Beveled Washers
Featuring an extended square surface area to distribute high torque loads on timber construction, heavy channels, and structural beams.
Bonded Rubber-to-Metal · EPDM / Viton
Industrial Sealing Washers
Self-sealing washers combining metallic backing with elastomeric rings to eliminate fluid and gas leaks in pressurized vessels and pumps.
DIN 6797A / 6797J · Serrated Tooth
Tooth Lock Washers
Internal and external teeth grip mating surfaces to maintain electrical grounding contact and prevent rotational backing out of screws.
DIN 137A / 137B · Wave Spring
Curved Wave Washers
Offers moderate axial flexibility and moderate load capacity to absorb small axial thermal expansions in rotating shafts and motor bearings.
Exotic Alloys · Inconel · Monel · Titanium
Custom High-Alloy Washers
Precision-manufactured in Inconel 625/718, Monel K-500, Hastelloy C276, and Super Duplex S32750 for extreme corrosive and thermal service.
Engineering Reference
Washer Technical Specifications & Standards
Comprehensive standard compliance data for international procurement teams, EPC contractors, and design engineers.
| Washer Category | Dimensional Standards | Available Material Grades | Size Range & Thickness |
|---|---|---|---|
| Plain Flat Washers | DIN 125A, DIN 125B, ISO 7089, ISO 7090, ASME B18.22.1, BS 4320 | SS 304, 316, 316L, 317L, 321, 347, Carbon Steel, Brass, Silicon Bronze | M2 to M100 (1/8" to 4"), Thickness 0.5 mm to 20 mm |
| Spring Lock Washers | DIN 127B, DIN 7980, ASME B18.21.1, IS 3063, BS 4464 | Spring Steel 65Mn, Stainless Steel 304 / 316, High Tensile Alloy Steel | M3 to M72 (1/4" to 3"), Custom Wire Sections |
| Structural Hardened Washers | ASTM F436 / F436M (Type 1 & Type 3), DIN 6916, EN 14399-6 | Quenched & Tempered Carbon Steel, Weathering Steel (Grade A588) | M12 to M64 (1/2" to 2-1/2"), Hardness 38 to 45 HRC |
| Wedge & Tooth Lock Washers | DIN 25201, DIN 6797A (External), DIN 6797J (Internal), DIN 6798 | High Carbon Alloy Steel, SS 316L, 254 SMO, Super Duplex S32750 | M3 to M42 (1/8" to 1-1/2"), Anti-Vibration Proof |
| Sealing & Bonded Washers | ASME B18.21.1, DIN 7603 (Copper / Aluminum / Vulcanized EPDM) | Mild Steel / Stainless Backing bonded with EPDM, NBR, Viton Rubber | M4 to M36, Pressure ratings up to 400 Bar |
| Exotic Alloy Washers | ASTM / ASME B18.22.1, Special Drawing Specifications | Inconel 600/625/718, Monel 400/K500, Hastelloy C276, Titanium Gr 2/5 | Custom Inner/Outer Diameters to Drawing |
* Non-standard dimensions, special stamping dies, non-standard outer diameters (OD), and custom chamfers manufactured to customer drawings.
Quality Assurance
Rigorous Quality Control & Testing Protocol
At Stud Bolt India, every manufacturing batch undergoes stringent destructive and non-destructive testing to verify structural integrity, dimensional precision, and material grade authenticity before export packaging.
- 100% Positive Material Identification (PMI) via handheld XRF analyzer.
- Hardness testing (Rockwell B/C, Vickers) for heat-treated lock and structural washers.
- High-precision micro-meter & optical profile projector dimensional verification.
- Salt Spray Corrosion Resistance testing (ASTM B117) for surface coatings.
- Flatness and parallelism inspection to ensure zero load distortion under torque.
- EN 10204 Type 3.1 Material Test Certificate supplied with every shipment.
Target Applications
Industries Reliant on Our Industrial Washers
Our engineered washers are chosen by international procurement managers for critical duty in high-stress and harsh chemical environments.
Petrochemical & Refining
SS 316L and Alloy washers for heat exchangers and reactor flange bolting.
Oil & Gas Pipelines
Duplex S31803 and ASTM F436 structural washers for high-pressure line joints.
Offshore & Marine
Super Duplex S32750 and Monel K-500 washers for subsea equipment.
Power & Aerospace
Inconel 718 and Titanium Grade 5 wave and spring washers for high thermal duty.
Global Reach
Worldwide Washer Export Footprint
Stud Bolt India supplies certified washers directly to major industrial hubs, ports, and project locations across the globe.
Export Destinations Served:
United Arab Emirates (Dubai, Abu Dhabi, Sharjah)
Saudi Arabia (Riyadh, Jubail, Yanbu, Dammam)
Qatar (Doha, Ras Laffan)
Oman (Muscat, Sohar)
Kuwait
United States (Houston, Chicago, Los Angeles)
United Kingdom (London, Aberdeen)
Germany (Hamburg, Frankfurt)
Singapore
Malaysia
Australia (Perth, Sydney)
Canada
Italy
Netherlands (Rotterdam)
South Korea
Buyers Guide
Frequently Asked Questions
What international standards do your washers comply with?
Our industrial washers are manufactured in compliance with international dimensional and material standards including DIN 125A/B, DIN 127B, DIN 6797, DIN 137B, ISO 7089, ASTM F436/F436M, ASME B18.21.1, and ASME B18.22.1. Non-standard washers are produced precisely according to customer engineering drawings.
Which material grades are available for industrial washers?
We manufacture washers in Stainless Steel (304, 316, 316L, 317L, 321, 347, 904L), Duplex Steel (UNS S31803/S32205), Super Duplex (UNS S32750/S32760), High Tensile Carbon Steel, Alloy Steel, Inconel (600, 625, 718), Monel 400/K-500, Hastelloy C276, Titanium, and Silicon Bronze.
Do you provide Material Test Certificates (MTC) with export shipments?
Yes. Every batch of washers is dispatched with complete EN 10204 3.1 Material Test Certificates, chemical composition analysis, mechanical property test reports, hardness testing data, and 100% heat-number traceability. Third-party inspection reports (TUV, DNV, Bureau Veritas, SGS) are provided upon request.
What surface protective coatings do you offer for anti-corrosion?
We supply protective coatings including Hot-Dip Galvanizing (HDG to ASTM A153), PTFE/Xylan Fluoropolymer coating, Electro-Zinc Plating, Zinc-Nickel Alloy Plating, Cadmium Plating, and Phosphate Coating to withstand aggressive saline, offshore, and acidic chemical environments.
Can you manufacture custom dimensions according to engineering drawings?
Yes, we custom-engineer and precision-stamp washers with non-standard inner diameters, outer diameters, custom thicknesses, chamfers, and specialized material specifications to match exact client engineering drawings and project requirements.
Need Custom Washers or Standard Technical Quotes?
Send your washer specifications, sizes, standards, material grades, and quantity requirements to our engineering sales team for rapid pricing and lead-time estimation.