Industrial Fasteners Suppliers & Exporter in India
Amardeep Steel Centre LLP is a leading fasteners manufacturer, stockist, supplier and exporter based in Mumbai, India, supplying Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloy, Titanium, Tantalum and Zirconium Bolts, Nuts, Studs, HSFG Bolts and Washers to process industries in over 60 countries.
We supply to IS 1367, ASTM A193, A194, A320, A307, A453, A325 and A563 specifications, with full EN 10204 3.1/3.2 mill test certification. Send your grade and size via the Enquiry form for an instant quote.
What Are Industrial Fasteners? Bolts, Nuts, Studs & Washers Explained
- Bolts: externally threaded fasteners used with a nut to clamp two components together through a clearance hole; the head is typically hex, socket or carriage style.
- Studs: fully or partially threaded rods with no head, screwed into a tapped hole on one end with a nut fitted on the other; common on flanged joints, pressure vessels and equipment where one side of the joint isn't accessible for a bolt head.
- Nuts: internally threaded fasteners tightened onto a bolt or stud to complete the clamped joint; available in hex, heavy hex, 2H and other forms matched to the mating bolt/stud grade.
- Washers: flat or spring discs placed under a nut or bolt head to spread clamping load, protect the joint surface, and (for spring washers) resist loosening under vibration.
- HSFG Bolts: High Strength Friction Grip bolt assemblies (bolt, nut and washer) tightened to a specified torque so the connected plates transfer load by friction rather than shear; used in structural steel and bridge connections.
Understanding Fastener Property Classes & Grades
Bolt and stud strength is specified either as a metric Property Class (ISO 898-1 / DIN) or as an ASTM material grade the two systems are often confused, so here's how to read them:
- Metric Property Class (e.g. 4.6, 5.6, 8.8, 10.9, 12.9): the first digit x100 gives the approximate minimum tensile strength in MPa, and multiplying both digits together x10 gives the approximate minimum yield strength in MPa. Class 8.8, for example, has roughly 800 MPa tensile and 640 MPa yield strength.
- ASTM A193 (studs/bolts for high-temperature service): Grade B7 is the standard chrome-moly high-strength grade; B7M is a lower-hardness version of the same alloy for sour (H2S) service under NACE MR0175; B16 adds vanadium for elevated-temperature creep resistance; L7/L7M are low-temperature equivalents of B7/B7M; B8/B8M are austenitic stainless steel (304/316) grades.
- ASTM A194 (nuts to match A193 studs): Grade 2H is the standard heavy hex nut for B7 studs; 2HM and 7M are the sour-service (NACE) equivalents; Grade 4, 7 and 8 cover other alloy and stainless combinations.
- ASTM A320 (low-temperature service): covers grades such as L7, L7M and L43 for bolting used below -29C, where standard A193 grades can lose toughness.
- HSFG Property Classes: 8.8 (marked 8S) and 10.9 (marked 10S) are the two standard classes for friction-grip structural bolting to IS 3757/ISO 7412.
Fasteners Manufacturing Process in India
Fasteners we supply are produced through one of two routes, chosen by size, grade and required mechanical properties:
- Hot Forged: raw material is cut, heated and forged into shape before machining and thread rolling. Preferred for larger diameters and higher-strength applications: forging aligns the material's grain flow with the fastener's shape, giving better fatigue and shock resistance.
- Cold Formed: the fastener is formed from wire or bar at room temperature by cold heading and thread rolling. Faster and more economical for standard sizes and volumes, with a smoother surface finish, though generally limited to lower-hardness grades than hot forging.
Typical process flow: raw material cutting and inspection, forging or cold heading, annealing/heat treatment (quenching & tempering for high-strength grades), thread rolling, surface finishing/coating, and final inspection and marking before packaging.
Coatings & Surface Finishes for Industrial Fasteners
- Zinc Plating: economical corrosion protection for general indoor/outdoor use
- Hot-Dip Galvanising: thick zinc coating for long-term outdoor and structural steel exposure
- PTFE / Xylan Coating: low-friction, corrosion-resistant coating for critical or hard-to-service joints
- Black Oxide: light corrosion resistance with minimal dimensional change, common on tool-steel fasteners
- Passivation: chemical treatment for stainless steel fasteners to restore and enhance the natural chromium-oxide corrosion-resistant layer
Fasteners Manufacturers & Suppliers — Grades We Stock and Supply
Below is our complete material-wise fastener range. Click through to any specific material page for chemical composition, mechanical properties and available sizes.
- Stainless Steel Fasteners — 304, 304L, 316, 316L, 321, 347, 410, 430 in B8/B8M grades
- Carbon Steel Fasteners — ASTM A307, A325, IS 1367 property classes 4.6-8.8
- Alloy Steel Fasteners — ASTM A193 B7/B7M/B16, A320 L7/L7M/L43
- Duplex Steel Fasteners — S31803/S32205 for chloride-rich service
- Super Duplex Steel Fasteners — S32750/S32760 for severe offshore service
- Nickel Alloy Fasteners — Alloy 20, Nickel 200/201 and related grades
- Monel Fasteners — Monel 400/K-500 for marine and seawater service
- Inconel Fasteners — Inconel 600/625/718/800/825 for high-temperature service
- Inconel 690 Fasteners — for nuclear and high-corrosion applications
- Hastelloy Fasteners — C276, C22 for extreme corrosion resistance
- SMO 254 Fasteners — 6-Moly super-austenitic for seawater/chloride service
- Titanium Fasteners — Grade 2 and Grade 5 for aerospace and marine use
- Aluminium Fasteners — lightweight, corrosion-resistant fasteners
- Cu-Ni Fasteners — 90/10 and 70/30 for seawater and marine hardware
- Zirconium 702 Fasteners — for hydrochloric and sulphuric acid service
Industrial Fasteners Specifications & Standards
Complete standards and grade range for our fastener types:
| Type | Material | Standard | Grades |
|---|---|---|---|
| Studs | Alloy Steel, Carbon Steel, Stainless Steel, High Nickel, Titanium, Tantalum, Monel, Inconel, Hastelloy, Zirconium | IS 1367 Part-III, ASTM A193, A320, A307, A453 | 4.6, 5.6, 6.6, 6.8, 10.9, 12.9 (IS/ISO/DIN); B7, B7M, B16, L7, L7M, L43, 307B, B8, B8M |
| Bolts | Alloy Steel, Carbon Steel, Stainless Steel, High Nickel, Titanium, Tantalum, Monel, Inconel, Hastelloy, Zirconium | IS 1367 Part-III, ASTM A193, A320, A307, A453, A325 | 4.6, 5.6, 6.6, 8.8, 10.9, 12.9 (IS/ISO/DIN); B7, B7M, B16, L7, L7M, L43, 307B, B8, B8M, 8S, 10S |
| Nuts | Alloy Steel, Carbon Steel, Stainless Steel, High Nickel, Titanium, Tantalum, Monel, Inconel, Hastelloy, Zirconium | IS 1367 Part-VI, ASTM A194, A563 | 4, 5, 8, 10, 12 (IS/ISO/DIN); Gr. B, 2H, 2HM, 4, 7, 8, 7M |
| HSFG Bolts, Nuts & Washers | Alloy Steel, Carbon Steel, Stainless Steel, High Nickel, Titanium, Tantalum, Monel, Inconel, Hastelloy, Zirconium | ISO 7412 (Bolts), IS 3757; ISO 4775 / IS 6623 (Nuts); ISO 7415 / IS 6649 (Washers) | Property Class 8.8 (8S), 10.9 (10S) |
Industrial Fasteners Applications & Industries We Serve
Our fasteners are supplied to Chemicals, Petrochemicals, Oil & Natural Gas, Fertilizers, Sugar Mills & Distilleries, Cement Industries, Ship Building, Paper Industries, Pumps, Automation, Paints and general Steel Industries.
- Oil & Gas and Marine: NACE-compliant B7M/L7M studs and Duplex/Super Duplex/Monel fasteners for sour service, wellheads, offshore platforms and marine hardware exposed to seawater.
- Power, Petrochemical & Process Plants: High-temperature B7/B16 alloy steel studs and Inconel/Hastelloy fasteners for boilers, heat exchangers and pressure vessel flange connections.
- Structural & Construction: HSFG bolts, nuts and washers to IS 3757/ISO 7412 for structural steel connections, bridges and heavy fabrication.
Fasteners Exporter — Countries We Serve
We regularly export fasteners to Kuwait, UAE, UK, Iran, Iraq, Qatar, Bahrain, Oman, Yemen, Lebanon, Jordan, Saudi Arabia, Malaysia, Indonesia, Singapore, Australia, New Zealand, USA, Canada, Mexico, Brazil, Netherlands, Germany, Italy, Spain, Poland, South Africa, Turkey, Egypt and Sri Lanka, among 60+ countries.
Why Choose Us as Your Fasteners Manufacturer & Supplier in India
- Large ready stock across all fastener types, materials and property classes for immediate dispatch
- Full EN 10204 3.1/3.2 mill test certification with heat-to-test traceability
- NACE MR0175-compliant grades available for sour service
- Regular exports to 60+ countries across the Middle East, Africa, Europe, Americas & South-East Asia
Request a Quote from Our Fasteners Suppliers in India
Send us your fastener type, grade, size and quantity via our Enquiry page or Contact Us directly for the best fastener prices in India.
Get a Quote Now Email EnquiryFrequently Asked Questions About Fasteners
Who is a reliable fasteners manufacturer in India?
Amardeep Steel Centre LLP is a Mumbai-based fasteners manufacturer, stockist and exporter supplying Stainless, Carbon, Alloy, Duplex and Nickel Alloy bolts, nuts, studs and HSFG bolts to over 60 countries.
What is the difference between a bolt and a stud?
A bolt is threaded along part of its length and used with a nut through a clearance hole. A stud is threaded on both ends (or fully threaded) and screws into a tapped hole on one side, with a nut fitted on the other — common on flanged joints where a bolt head can't be accessed.
What does a bolt property class like 8.8 or 10.9 mean?
The property class is a metric strength grade: the first number x100 gives the approximate minimum tensile strength in MPa, and both digits multiplied x10 give the approximate yield strength. Class 8.8 has roughly 800 MPa tensile and 640 MPa yield strength.
What is the difference between ASTM A193 B7 and B7M studs?
Both are chrome-moly alloy steel studs to ASTM A193. Grade B7 is the standard high-strength grade for general high-temperature/high-pressure service. B7M is a lower-hardness version specified for sour (H2S) service under NACE MR0175.
What are HSFG bolts used for?
HSFG (High Strength Friction Grip) bolts are high-tensile bolts, typically Property Class 8.8 or 10.9, torqued so the clamped plates transfer load by friction rather than shear — widely used in structural steel connections and bridges.
Do you export fasteners internationally?
Yes, we are an established fasteners exporter shipping regularly to the UAE, Saudi Arabia, Kuwait, Qatar, the UK, USA, Canada, Germany, Australia and more.
