Nut Manufacturer in India
Unifit Fastener is a trusted nut manufacturer in India, specialising in high-precision engineered fasteners in important industrial verticals. Our products are manufactured and supplied in a complete variety of nuts: hex nuts, heavy hex nuts, dome nuts, flange nuts, square nuts, lock nuts, and weld nuts in a variety of materials and sizes to suit various projects.
We use the finest stainless steel nuts, carbon steel nuts, alloy steel nuts, duplex nuts & super duplex nuts, nickel alloy nuts and cupro-nickel materials in the manufacture of our products subjected to high-quality control systems. All nuts are manufactured according to the national and international standards in order to guarantee high strength, dimensional perfection, and long life. Our nuts are able to withstand extreme conditions and have a high resistance to corrosion, pressure, vibration, and extreme temperatures.
Unifit Fastener serves several industries, including oil and gas, petrochemical, building, marine, power generation, automobile and heavy engineering industries in India and abroad. We also do custom-made nuts that fit specific drawings and technical needs.
Unifit Fasteners is a reliable company to deal with in terms of fastening solutions due to reliable manufacturing ability, timely delivery, competitive prices, and a customer-focused strategy.
Looking for high-quality industrial nuts? Call Unifit Fasteners now and get specifications, prices and quick quotations.
Alloy Steel Nylock Nuts, Stainless Steel Eye Nut Supplier in India, SS Hex Nuts, Monel Heavy Hex Nut, Duplex Steel Flange Nut, Inconel Lock Nut, Titanium Dome Nuts Manufacturer in Mumbai, India, Super Duplex Steel Nut Stockholder, Alloy 20 Square Nuts Exporter, Hastelloy Weld Nut, Stainless Steel Hex Nut.
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Nuts Materials
Nickel Alloys Nuts
Duplex Nuts
Super Duplex Nuts
Cupro-Nickel Nuts
Inconel Nuts
Monel Nuts
Hastelloy Nuts
Specification of Nuts
| Parameter | Details |
|---|---|
| Standards |
|
| Length Range | 3 mm – 200 mm |
| Size Range |
|
| Available Forms | Hex, Square, Round, Threaded, as per Gauge |
| Types Offered | Hex Nut, Eye Nut, Dome/Acorn Nut, Wing Nut, T-Nut, Lock Nut, Panel Nut, Coupling Nut, Square Nut, etc. |
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Nuts Types
Dome Nut
Weld Nut
Threaded Nut
Square Nut
Nylock Nut
Lock Nut
Hex Nut
Heavy Hex Nut
Flange Nut
Eye Nut
Chemical Composition of Nuts
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| SS 316 Min | – | – | – | 0 | – | 16.0 | 2.00 | 10.0 | – |
| SS 316 Max | 0.08 | 2.0 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.10 |
| SS 316L Min | – | – | – | – | – | 16.0 | 2.00 | 10.0 | – |
| SS 316L Max | 0.03 | 2.0 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.10 |
| SS 316H Min | 0.04 | 0.04 | 0 | – | – | 16.0 | 2.00 | 10.0 | – |
| SS 316H Max | 0.10 | 0.10 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | – |
Mechanical Properties of Nuts
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation % (50 mm) | Hardness Rockwell B (Max) | Hardness Brinell (Max) |
|---|---|---|---|---|---|
| SS 316 | 515 | 205 | 40 | 95 | 217 |
| SS 316L | 485 | 170 | 40 | 95 | 217 |
| SS 316H | 515 | 205 | 40 | 95 | 217 |
Nut Dimensions / Weight Reference Chart
| Nominal Size (D) | D Max | D Min | H Max | H Min | F Max | F Min | C Max | C Min |
|---|---|---|---|---|---|---|---|---|
| m10 | 10.00 | 9.78 | 6.63 | 6.17 | 17.00 | 15.73 | 18.48 | 17.77 |
| m12 | 12.00 | 11.73 | 7.76 | 4.24 | 19.00 | 17.73 | 20.78 | 20.03 |
| m14 | 14.00 | 13.73 | 9.09 | 8.51 | 22.00 | 20.67 | 24.25 | 23.35 |
| m16 | 16.00 | 15.73 | 10.32 | 9.68 | 24.00 | 23.67 | 27.71 | 26.75 |
| m20 | 20.00 | 19.67 | 12.88 | 12.12 | 30.00 | 29.16 | 34.64 | 32.95 |
| m24 | 24.00 | 23.67 | 15.44 | 14.56 | 36.00 | 35.00 | 41.57 | 39.55 |
| m30 | 30.00 | 29.67 | 19.48 | 17.92 | 46.00 | 45.00 | 53.12 | 50.85 |
| m36 | 36.00 | 35.61 | 23.38 | 21.63 | 55.00 | 53.80 | 63.51 | 60.79 |
| m42 | 42.00 | 41.38 | 26.97 | 25.03 | 65.00 | 62.90 | 75.06 | 71.71 |
| m48 | 48.00 | 47.38 | 31.07 | 28.93 | 75.00 | 72.60 | 86.60 | 82.76 |
| m56 | 56.00 | 55.26 | 36.20 | 33.80 | 85.00 | 82.20 | 98.15 | 93.71 |
| m64 | 64.00 | 63.26 | 41.32 | 38.68 | 95.00 | 91.80 | 109.70 | 104.65 |
| m72 | 72.00 | 71.26 | 46.45 | 43.55 | 105.00 | 101.40 | 121.24 | 115.60 |
| m80 | 80.00 | 79.26 | 51.58 | 48.42 | 115.00 | 111.00 | 132.72 | 126.54 |
| m90 | 90.00 | 89.13 | 57.74 | 54.26 | 130.00 | 125.50 | 150.11 | 143.07 |
| m100 | 100.00 | 99.13 | 63.90 | 60.10 | 145.00 | 140.00 | 167.43 | 159.60 |
Stainless Steel Nuts
We manufacture stainless steel nuts in grades 304, 304L, 316, 316L, 321 and 347/347H, widely preferred for corrosion resistance and long service life. These nuts are used in construction, water treatment, food processing, and general engineering applications, offering excellent oxidation resistance and hygiene compatibility.
Duplex & Super Duplex Nuts
For chloride-rich and aggressive corrosive environments, we supplyDuplex (S31803/S32205) and Super Duplex (S32750/S32760) nuts. These nuts provide high strength, resistance to stress corrosion cracking, and exceptional performance in offshore platforms, desalination plants, and marine environments.
Alloy Steel & High-Strength Nuts
Our alloy steel nuts including ASTM A193 Grade B7/B16 are designed for high-pressure bolting, refineries, power plants, and heavy engineering sectors, ensuring excellent tensile strength and fatigue resistance.
Cupro-Nickel Nuts
We manufacture high-quality Cupro-Nickel nuts designed for excellent performance in seawater and marine environments. Available in 90/10 and 70/30 grades, these nuts offer outstanding resistance to saltwater corrosion, biofouling, and erosion in high-velocity water systems. They are widely used in shipbuilding, desalination plants, heat exchangers, condensers, and offshore piping systems. Engineered for durability and dimensional accuracy, our Cupro-Nickel nuts ensure secure, leak-proof fastening even in harsh service conditions.
Monel Nuts
We supply premium Monel nuts known for exceptional resistance to seawater, acids, and alkaline media. Manufactured in grades Monel 400/Monel K500, these nuts provide high strength, excellent toughness, and resistance to chloride stress corrosion cracking. They are widely used in marine engineering, chemical processing, pump systems, heat exchangers, and oil & gas applications, ensuring reliable performance in harsh and corrosive environments.
Inconel Nuts
We manufacture Inconel nuts for high-temperature and high-pressure service conditions. Produced in grades such as Inconel 600, 601, 625, 718, and X-750, these nuts retain strength at elevated temperatures and offer outstanding resistance to oxidation and creep. They are commonly used in gas turbines, nuclear plants, furnaces, petrochemical processing, and aerospace applications, making them ideal for extreme operating environments.
Hastelloy Nuts
We offer Hastelloy nuts designed for highly corrosive industrial processes. Available in grades Hastelloy C276, C22, and B2, these nuts deliver excellent resistance to strong acids such as hydrochloric and sulfuric acid, as well as pitting and stress corrosion cracking. They are extensively used in pharmaceuticals, chemical reactors, pollution control equipment, and petrochemical plants, where safety and reliability are critical.
Nuts Applications & Uses
- Chemical and Petrochemical Processing
- Mechanical Engineering and Industrial Plant Construction
- Food, Beverage & Dairy Processing Industry
- Oil, Gas, and Offshore Applications
- Conventional and Renewable Power Generation Plants
- Process Control and Instrumentation Systems
- Automotive Manufacturing and Component Production
Nuts Standards – DIN, ISO, BS & IS
Unifit Fasteners manufactures nuts in compliance with international and Indian standards to ensure accuracy, durability, and interchangeability across global projects.
DIN Standards
DIN standards are widely used in European and global mechanical engineering. We manufacture nuts as per the following DIN specifications:
- DIN 934 – Hex Nuts
- DIN 439 – Thin Hex Nuts
- DIN 936 – Castle Nuts
- DIN 555 – Hex Nuts with Metric Coarse Thread
- DIN 985 / DIN 982 – Nylon Insert Lock Nuts
- DIN 917 – Cap Nuts
- DIN 928 / DIN 929 – Square Weld Nuts
Note: Although some DIN standards are replaced by ISO, DIN nuts remain widely used for legacy machines and maintenance projects.
ISO Standards (International Organization for Standardization)
ISO standards ensure global compatibility and interchangeability. We manufacture nuts as per:
- ISO 4032 / ISO 4033 – Hex Nuts (Style 1 & 2)
- ISO 4035 – Low Hex Nuts
- ISO 7042 – All-Metal Lock Nuts
- ISO 10511 / ISO 10512 – Nylon Insert Lock Nuts
These standards cover dimensions, threading systems, and mechanical properties.
BS Standards (British Standards)
We supply nuts according to major British Standards such as:
- BS 3692 – Precision Hexagon Nuts
- BS 4190 – Black Hexagon Nuts for General Engineering
Many BS standards are now harmonized with ISO but continue to be used in UK and Commonwealth projects.
IS Standards (Indian Standards – BIS)
For Indian applications, our nuts are produced according to Bureau of Indian Standards (BIS):
- IS 1363 – Hexagon Nuts (Coarse Thread)
- IS 1364 – Precision Hex Nuts
- IS 1367 – Technical Requirements for Threaded Fasteners
- IS 3757 – High-Strength Nuts for Structural Steelwork
People Ask About Nuts Manufacturer
How are nuts manufactured?
Nuts are typically manufactured through a series of forming and machining processes. First, metal wire or rods are cut into small pieces called blanks. These blanks are then shaped using cold forging or hot forging to form the basic nut shape. Internal threads are created using tapping or thread cutting. After threading, the nuts undergo heat treatment to improve strength and hardness. Finally, surface finishing processes such as galvanizing, plating, or coating are applied for corrosion resistance and improved appearance. Each nut is inspected to ensure correct dimensions and accurate threading.
Which material is used for nuts?
Nuts are manufactured using a wide range of materials based on application and required mechanical properties. Common materials include stainless steel, carbon steel, alloy steel, and mild steel. For high-temperature or corrosive environments, specialty alloys such as Inconel, Monel, Duplex, Super Duplex, and Hastelloy are used. Non-metallic materials like brass, nylon, and plastic are also selected where electrical insulation, corrosion resistance, or lightweight properties are required. Material selection depends on load, operating environment, temperature, and corrosion resistance requirements.