Washers Manufacturers In India
Unifit Fastener is a modern manufacturer and supplier of quality industrial washers, such as fasteners, stainless steel washers, Inconel washers, Monel washers, Hastelloy washers and other precision fasteners. Having the experience in the industry, our products will be of the strength, durability, and reliability to guarantee the maximum performance of our products in all usage.
Our washers are also designed to spread the weight of nuts and bolts uniformly, and this makes the fastened assemblies last longer and work better. Our washers can be bought in standard and custom sizes in a wide range of applications in the engineering, chemical processing, aerospace, water treatment, food processing, and power generation industries that demand high reliability. Rubber washers can also be used to eliminate vibration and provide additional protection in pressure conditions.
In Unifit Fastener, we also employ high-quality raw materials and state-of-the-art manufacturing methods to manufacture washers that fully satisfy all the requirements of the perfect fit and airtight usage. The quality of every product is thoroughly checked through destructive and non-destructive tests to guarantee mechanical strength, resistance to corrosion and structural integrity.
Our team produces products that are delivered on time, and we follow effective logistics to deliver all orders in a safe package made of materials that are environmentally friendly. Select Unifit Fastener as a fastening partner to your industry solution using quality washers, custom fasteners, and an outstanding partner to your fastening needs. Call us and make your order!
Largest Stockholder of Washers in India, Steel Washers, Stainless Steel Internal Tooth Lock Washers, Ready Stock of Washers, SS Conical Spring Washers, EPDM Washers, ASME B18.23.1 Beveled Washers Manufacturers in Mumbai, India, Competitive Price of Washers, M12 Washers, Monel Hex Washers.
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Washers Materials
Nickel Alloys Washers
Duplex Washers
Super Duplex Washers
Cupro-Nickel Washers
Inconel Washers
Incoloy Washers
Specification of Washers
| Parameter | Details |
|---|---|
| Size Range | M02 to M33 (custom sizes available) |
| Length | 3 mm to 200 mm |
| Thread Types | UNF, UNC, BSW, BSF, Metric or as specified |
| Standards | DIN 125, DIN 127, DIN 137, DIN 6797, ISO 7089, ASTM F436M, ASME B18 series, IS 2016 |
| Forms | Round, Square, Hex, Threaded – as per gauge |
| Material Source | JSPL, Tata Steel, Mukund Steel, Usha Martin, Dhamm Steel |
| Thread Configuration | ASME B1.1 (2A/3A–2B/3B) & B1.13M Metric Coarse |
| Certification | ASTM / ASME Dual Certification |
| Popular Types | Flat, Machine, Spring, Star, Lock, Split, Sealing Washers |
| Threading Method | Rolled or cut threads, horizontal/vertical |
| Test Certificates | EN 10204 3.1 Manufacturer Test Certificate |
| Additional Approvals | PED 97/23/EC, AD 2000 W2 |
| Manufacturing Process | Hot forging (M24–M100), Cold forging (M2–M24), CNC machining for custom sizes |
| Drive Options | Slotted, Phillips, Six-Lobe, Combo drive |
| Packaging | Bulk, cartons, pallets, small boxes, or as requested |
| Surface Coatings | PTFE, Teflon, Phosphate, Zinc, Hot-dip galvanizing, Cadmium, Xylan |
| Finish Options | Self-color, Passivated, BZP, HDG, Sherardized, Dacromet, Nickel plated, Anodized, Black oxide |
| Zinc Variants | Blue, black, yellow, white |
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Washers Forms & Availability
| Products | Size | |
|---|---|---|
| SS Flat Washer | Stainless Steel Split Lock Washer | M02 to M33, Custom Sizes |
| Carbon Steel Spring Wave Washer | Alloy Steel External Tooth Lock Washer | |
| Incoloy Internal Tooth Lock Washer | Titanium Weight Chart (Plain Washer) | |
| Nickel Square Section Spring Washer | Alloy 20 Flat Section Spring Washer | |
| Hastelloy Hardened Washer | Titanium Hardened Steel Washer | |
| Cu-Ni Lock Washers | Monel Plain Washers | |
| SMO 254 Beveled Washers | Inconel Allen Star Washers | |
Stainless Steel Washers
Unifit Fasteners is a leading manufacturer of stainless steel washers designed for superior load distribution, vibration resistance, and long service life. Stainless steel is one of the most preferred materials for washers due to its excellent corrosion resistance, cleanliness, and durability, making it ideal for construction, water treatment, marine, and food processing applications. We manufacture plain washers, spring washers, wave washers, and shim washers in 304/304L, 310, 316/316L, 317, 321, 347 stainless steels. These grades offer excellent resistance to oxidation and chloride attack. For applications requiring higher strength, strain-hardened variants are also available. All washers are produced in compliance with ASTM, DIN, and ISO standards with precise dimensional accuracy.
Duplex Steel Washers
For environments where conventional stainless steel fails, Unifit Fasteners supplies Duplex Steel Washers. These washers combine ferritic and austenitic microstructures, providing high yield strength and superior resistance to pitting and stress corrosion cracking. Grades such as UNS S31803 and S32205 are widely used in offshore platforms, desalination plants, chemical tankers, and marine structures, where reliability under chloride-rich environments is essential.
Super Duplex Steel Washers
We manufacture Super Duplex Steel Washers for extremely aggressive service environments such as subsea, offshore drilling, and heat exchangers. Grades like UNS S32750 and S32760 offer outstanding resistance to pitting, crevice corrosion, and erosion, along with exceptional mechanical strength. Controlled heat treatment ensures toughness and eliminates embrittlement, making them suitable for critical infrastructure applications.
Inconel Washers
Unifit Fasteners produces Inconel Washers for high-temperature and corrosive service conditions. Inconel alloys such as 600, 601, 625, 718 and X-750 retain mechanical strength even at elevated temperatures where conventional steels suffer oxidation or creep. These washers are widely used in gas turbines, thermal processing equipment, furnaces, nuclear reactors, and aerospace systems, where thermal stability is vital.
Incoloy Washers
Our Incoloy 825 and 800 series washers are engineered for applications involving sulfuric, phosphoric, and nitric acids. Their nickel-iron-chromium composition with additions of copper and molybdenum provides excellent resistance to localized corrosion, stress corrosion cracking, and reducing/oxidizing media. They are commonly used in pollution control systems, chemical processing plants, and oil & gas recovery equipment.
Monel Washers
Unifit Fasteners supplies Monel 400 and K500 washers ideal for marine, seawater handling, and chemical environments. Monel 400 offers exceptional resistance to saltwater corrosion and chloride stress cracking. Monel K500, age-hardened with aluminum and titanium, delivers higher strength for marine shafts, pump systems, and valve components, while maintaining excellent toughness across temperature ranges.
Hastelloy Washers
Our Hastelloy C276, C22, and B2 washers are designed for service in the most chemically aggressive environments. They resist attack from hydrochloric, sulfuric, and acetic acids and are widely utilized in pharmaceutical plants, flue gas desulfurization units, petrochemical processing, and pollution control systems. Strict quality control ensures metallurgical integrity during forging and machining.
Nickel Alloy Washers
Unifit Fasteners manufactures Nickel 200 and Nickel 201 washers for applications involving alkalis and caustic solutions. These commercially pure nickel grades feature excellent thermal and electrical conductivity with good mechanical properties. They are preferred in food processing, synthetic fiber production, battery manufacturing, and electrical equipment.
Copper Nickel Washers
We supply Cu-Ni 70/30 and 90/10 washers that offer exceptional resistance to biofouling and seawater corrosion. They are widely used in heat exchangers, condenser systems, desalination plants, shipbuilding, and offshore cooling systems. Additions of iron and manganese improve resistance to high-velocity seawater and erosion.
Alloy Steel Washers
Our alloy steel washers are designed for high-pressure and high-temperature service. Common grades include ASTM A193 B7 and B16, frequently used in refineries and power plants. These washers provide excellent tensile strength, fatigue resistance, and load-bearing capability and are heat-treated to meet strict hardness specifications.
Titanium Washers
Unifit Fasteners manufactures Titanium Grade 2 and Grade 5 washers for applications needing exceptional strength-to-weight ratio and unmatched corrosion resistance. Titanium washers are widely used in aerospace, motorsport components, offshore equipment, desalination plants, and pulp & paper bleaching systems, particularly where resistance to chlorides is critical.
DIN Standards
DIN standards are widely used in European engineering and machinery design and are still referenced globally. Unifit Fasteners manufactures DIN-standard washers across multiple sizes and materials to suit diverse applications.
Common DIN washer standards we supply include:
- DIN 125 – flat washers for metric bolts and screws
- DIN 127 – spring lock washers
- DIN 9021 – large series plain washers
- DIN 7989 – flat washers for steel structures
- DIN 6798 – serrated lock washers
- DIN 2093 – disc spring washers (Belleville washers)
Many traditional DIN washer standards now have ISO counterparts, but DIN references continue to be widely used in maintenance, repair, and legacy machinery.
ISO Standards (International Organization for Standardization)
ISO standards ensure compatibility in international projects and cross-border equipment supply. Our washers comply with ISO washer standards to guarantee interchangeability and consistent performance.
Key ISO washer standards include:
- ISO 7089 / ISO 7090 – plain flat washers (normal and large series)
- ISO 7092 – small series plain washers
- ISO 7093 – large outer diameter washers
- ISO 7098 – conical spring washers
- ISO 10673 – captive washers
- ISO 3506 – stainless steel mechanical properties for corrosion-resistant washers
- ISO- compliant washers are widely preferred in export projects, EPC contracts, and global OEM manufacturing.
BS Standards (British Standards)
British washer standards are widely referenced in UK and Commonwealth engineering specifications. Several BS standards now align with ISO, but they continue to be specified in:
- Infrastructure projects
- Petrochemical plants
Heavy structural steel fabrication
Commonly used washer standards include BS 4320 (metric plain washers) and BS 4462 (spring washers).
IS Standards (Indian Standards)
For Indian industrial projects, we follow Bureau of Indian Standards (BIS) specifications for washers used with bolts, nuts, and structural fasteners.
Important washer standards used in India include:
- IS 2016 – plain washers
- IS 5369 – spring lock washers
- IS 6649 – hardened and tempered washers for high-strength structural bolts
These standards ensure suitability for power plants, refineries, railways, fabrication, and heavy engineering applications.
Applications of Washer
- Aerospace Components: Ideal for jet engines, turbine sections, exhaust systems, and high-heat structural parts.
- Marine & Offshore Equipment: Used in seawater systems, offshore platforms, pumps, and valves due to exceptional corrosion resistance.
- Chemical & Petrochemical Plants: Suitable for reactors, heat exchangers, and equipment exposed to acids, alkalis, and aggressive chemicals.
- Oil & Gas Industry: Preferred for deep-sea drilling tools, high-pressure equipment, and sour-gas environments.
- Power Generation: Used in gas turbines, boilers, superheaters, and high-temperature fastening zones.
- Nuclear Industry: Performs well in radiation-prone and high-heat environments.
- Pharmaceutical & Food Processing: Applied where high purity, cleanliness, and corrosion resistance are mandatory.
- Heat-Treatment Furnaces: Reliable for fixtures and components operating in extreme temperatures.
People Ask About Washers Manufacturers
What are the main types of washers?
The most common washer types include flat washers, spring washers, lock washers, conical washers, tooth washers, and wave washers, each designed for specific performance requirements.
How do I select the right washer size?
Washer size is determined based on bolt diameter, load requirement, hole size, and applicable standards such as ASME, DIN, or ISO.