Steel Fasteners
PED approved production of ASTM A193 / A194 bolts, nuts and stud bolts from M2 to M100 in carbon, alloy and stainless steel — heat-treated, threaded and inspected in-house.
Pipe Fittings
ISO approved carbon and stainless steel butt weld fittings including ASTM A234 WPB and ASTM A420 WPL6 / WPL3 for low-temperature and high-pressure service.
Forged Flanges
ASME B16.5 forged flanges proven in LNG terminals and oil & gas pipelines across Far East Asia, West Africa and the Gulf, supplied with full material traceability.
About Viha Steel & Forging
Industrial Steel Fasteners & Forged Flanges Manufacturer in India
Founded in Mumbai in 2010 as a steel forging company, Viha Steel & Forging has grown into a PED approved manufacturer and exporter of industrial fasteners and ANSI / ASME B16.5 pipe flanges, trusted by EPC contractors, distributors and plant maintenance teams worldwide.
Our production covers hex bolts, stud bolts, threaded rods, nuts and screws in standard and special steel grades — from ASTM A193 B7 alloy studs for high-temperature refinery service to A2 / A4 stainless steel for marine and chemical environments. We are also among India's largest exporters of hot dip galvanized fasteners. Every forging passes NDT, chemical and mechanical testing and ships with a Mill Test Certificate, so your QA team receives verifiable data rather than promises.
2010Established
M2–M100Size Range
3rdLargest HDG Exporter
100%MTC Supplied
PED Approved · FMAI Member
Our mission is to create additional value in mutual interest with our customers and remain a preferred manufacturer in the fastener sector — with commercial terms aligned to each buyer's project needs.
PED Approved Nut & Bolt Manufacturer · Exporting from Mumbai, India
ASTMASMEDINENISO
Stocked to International Standards
Core Fastener Product Range
Ready stock and made-to-order production for project, MRO and distribution buyers. Each item is manufactured to the referenced ASTM, DIN, EN or ISO standard and dimensionally verified before dispatch.
High Tensile Fasteners
Property class 8.8, 10.9 and 12.9 bolts and nuts, quenched & tempered for structural, machinery and heavy equipment joints.
Stainless Steel Hex Head Bolts
DIN 931 / DIN 933 and ISO 4014 / 4017 hex bolts in A2-70 and A4-80 for corrosion-critical installations.
Stainless Steel Hex Nuts
DIN 934 / ISO 4032 and ASTM A194 Gr. 8 / 8M heavy hex nuts, matched to our bolts and studs for consistent thread fit.
304 Stainless Steel Bolts
AISI 304 (A2) bolts for food processing, architecture and general industrial use where good atmospheric corrosion resistance is required.
Stainless Steel Threaded Rod
Fully threaded rods (DIN 975 / 976) in all diameters and cut lengths — stocked in stainless, carbon and alloy steel.
Stainless Steel Stud Bolts
ASTM A193 B8 / B8M stud bolts with A194 nuts for flanged piping joints in petrochemical and process plants.
Buyer's Technical Reference
Fastener Grade Selection Guide
A quick comparison of the specifications our customers request most often. Use it to cross-check material, strength and typical service before finalising a purchase specification.
| Grade / Standard | Material | Min. Tensile | Min. Yield | Typical Mating Nut | Typical Application |
|---|---|---|---|---|---|
| ASTM A193 B7 | Cr-Mo alloy steel (AISI 4140/4142), Q&T | 125 ksi (≤ 2½") | 105 ksi | ASTM A194 2H | High-temperature, high-pressure flange bolting |
| ASTM A193 B8 Cl.1 | AISI 304 stainless, solution annealed | 75 ksi | 30 ksi | ASTM A194 Gr. 8 | Corrosive and cryogenic service |
| ASTM A193 B8M Cl.1 | AISI 316 stainless, solution annealed | 75 ksi | 30 ksi | ASTM A194 Gr. 8M | Chloride / marine environments |
| ASTM A325 (now F3125) | Medium carbon steel, Q&T | 120 ksi (≤ 1") | 92 ksi | ASTM A563 DH / A194 2H | Structural steel connections |
| ASTM A307 Gr. A | Low carbon steel | 60 ksi | — | ASTM A563 A | General-purpose, non-critical joints |
| EN 14399-4 10.9 HV | Alloy steel, Q&T | 1000 MPa | 900 MPa | EN 14399-4 Class 10 | Preloaded structural bolting (Europe) |
| DIN 6921 | Steel 8.8 / 10.9, A2 / A4 stainless | Per property class | Per property class | DIN 6923 flange nut | Automotive, machinery, no-washer assembly |
Experience Built into Every Batch
Our Manufacturing & Quality Control Process
Traceability is the difference between a fastener and a liability. Here is how each order moves through our Mumbai facility before it reaches your site.
01
Raw Material Control
Bar stock sourced against mill certificates and verified for chemistry before production.
02
Hot & Cold Forging
Heads and flanges forged for continuous grain flow and higher fatigue resistance.
03
Heat Treatment
Quench & temper or solution annealing to achieve the specified mechanical properties.
04
Thread Rolling
Rolled threads to ISO, UNC / UNF and 8-UN forms, gauged with GO / NO-GO gauges.
05
NDT Inspection
Non-destructive testing to detect surface and sub-surface defects in forgings.
06
Chemical & Mechanical Tests
Tensile, yield, hardness and chemical analysis recorded against each heat.
07
Mill Test Certificate
Every shipment documented with an MTC traceable to heat number and batch.
08
Export Packing
Seaworthy, labelled packing for safe delivery to ports across Asia, Africa and the Middle East.
Larger Sizes Available
3rd Largest Exporter of Hot Dip Galvanized Fasteners in India
Threaded rods in all sizes and lengths are held in stock, and larger diameters are forged to order. Below are the answers overseas buyers ask us for most before placing a first order.
We manufacture bolts, nuts, studs, threaded rods and screws from M2 up to M100 in metric sizes, with equivalent imperial sizes and custom lengths produced to drawing.
We are a PED approved manufacturer and FMAI member. Every forging passes NDT, chemical and mechanical testing and is shipped with a Mill Test Certificate traceable to the heat number.
Yes. We are one of the largest exporters of hot dip galvanized fasteners in India, supplying structural bolts, nuts, washers and threaded rods for infrastructure, transmission and power projects.
Our flange forgings and fasteners are installed in LNG projects and oil & gas pipelines across Far East Asia, West Africa and the Gulf countries, as well as high-speed railway projects.
Yes. Alongside carbon, alloy and stainless steel, we produce fasteners in phosphor bronze, silicon bronze, aluminum bronze, copper and titanium, in custom sizes and thread forms.
Metric Flange Bolts – DIN 6921
Stainless steel A2 / A4 and steel 8.8 / 10.9 hexagon flange bolts. The integrated flange spreads load and removes the need for a separate washer.
Read More
ASTM A325 Structural Bolts
Heavy hex structural bolts for steel-to-steel connections, available plain or hot dip galvanized with matching nuts and hardened washers.
Read More
ASTM A193 B8 Bolt
A193 B8 / B8M stud bolts with A194 Gr. 8 / 8M nuts, supplied for petrochemical piping and high-speed railway projects.
Read More
ASTM A193 B7 Bolt
Chromium-molybdenum alloy steel studs and bolts for high-temperature, high-pressure service; L7 variants available for low-temperature duty.
Read More
ASTM A307 Carbon Steel Bolts
Carbon steel bolts, studs and threaded rods of 60,000 psi tensile strength in diameters from ¼" to 4" for general construction.
Read More
Metric Threaded Rod
Threaded rod in stainless steel, carbon steel, brass, titanium and aluminum alloy for anchoring, hanging and general-purpose fastening.
Read More
ASTM A193 B8M Bolt
Class 1 fasteners similar to B8 but manufactured from AISI 316 stainless steel for superior pitting resistance in chloride environments.
Read More
EN 14399-4 10.9 HV Bolts
High-strength preloadable HV bolt assemblies for European structural steelwork, supplied as matched bolt, nut and washer sets.
Read More
Fasteners Specification
Standard specifications for ASTM A194 nuts, DIN 934 / DIN EN ISO 4032 hex nuts, SS 316 / SS 304 grades and ASTM A193 fasteners.
Proven in the Field
Industries We Supply
Oil, Gas & LNG
Flange bolting and forged flanges for pipelines, terminals and refineries.
Power Generation
High-temperature B7 studs and HDG bolts for plants and transmission.
Infrastructure
Structural A325 and EN 14399 assemblies for bridges, rail and buildings.
Marine & Shipbuilding
316, silicon bronze and aluminum bronze fasteners for seawater exposure.
Technical Documents
Catalogs & Dimension Charts
Dimension and specification catalogs for engineers and procurement teams. Contact our sales desk to receive the PDF files by email.
Fasteners
Flanges
Forged Fittings
Pipe Fittings
Pipes
