Stud Bolts

Stud Bolts Manufacturer • Stud Bolts Exporter • Stud Bolts Supplier • Stud Bolts Dealer • Stud Bolts Distributor • Stud Bolts Stockist • Stud Bolts Wholesaler

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Company Overview – Dipti Metal Industries

Founded in 2009, Dipti Metal Industries is a globally recognized manufacturer, exporter, and supplier of Stud Bolts in carbon steel, alloy steel, stainless steel, duplex/super duplex, nickel alloys, and other high-performance metals.

From our state-of-the-art manufacturing facility in Mumbai, India, we export to 65+ countries across North America, Europe, the Middle East, Africa, Asia-Pacific, Japan, and Oceania.

Our global edge:

• ISO-certified production & CNC precision machining

• AI-driven supply chain optimization for on-time delivery

• Full material traceability with EN 10204 3.1 / 3.2 MTCs

• Large ready stock for urgent requirements

• Custom lengths, threads, and coatings for specialized projects

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What Are Stud Bolts?

Stud bolts are threaded rods without heads, supplied in full-thread, double-end, or tap-end types. They are commonly used in high-pressure flanged connections, machinery assemblies, and structural applications requiring strong, secure fastening.

Common types include:

• Double-End Studs (DIN 938 / DIN 939) – Thread at both ends with a plain shank in the middle

• Full-Thread Studs (DIN 975 / DIN 976) – Threaded along the entire length

• Tap-End Studs – Short thread on one end for tapping into components, long thread on the other for nut fastening

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International Standards

DIN / ISO:

• DIN 938, DIN 939 – Double-end studs

• DIN 975, DIN 976 – Full-thread studs

• ISO 898-1 – Mechanical property classes (4.6, 8.8, 10.9, 12.9)

ASTM / ASME:

• ASTM A193 – Alloy and stainless steel bolting for high-temperature or high-pressure service

• ASTM A320 – Low-temperature bolting materials

• ASTM A354 – High-strength alloy steel bolts and studs

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ASTM A193 Stud Bolt Grades & Equivalents

We manufacture and export Stud Bolts in Class 1 and Class 2 across the full ASTM A193 range for high-pressure, high-temperature, and corrosive service applications.

Alloy Steel Grades

• B5 – Chromium-molybdenum alloy steel

• B7 – Cr-Mo alloy steel, quenched & tempered

• B7M – Same as B7, reduced hardness for sour service (H₂S)

• B16 – Cr-Mo-V alloy steel for high-temperature service

Stainless Steel Grades (Austenitic)

• B8 – Type 304 stainless steel (Class 1 & 2)

• B8M – Type 316 stainless steel (Class 1 & 2)

• B8C – Type 347 stainless steel

• B8P – Type 348 stainless steel

• B8T – Type 321 stainless steel

• B8LN – 304LN stainless steel (low carbon, nitrogen enhanced)

• B8MLN – 316LN stainless steel (low carbon, nitrogen enhanced)

• B8G – Type 304N stainless steel (nitrogen strengthened)

• B8CLN – 347LN stainless steel (low carbon, nitrogen enhanced)

• B8Y – Type 302 stainless steel

• B8A – Type 305 stainless steel (low work hardening)

• B8CA – Type 384 stainless steel

• B8B – Type 303 stainless steel (free-machining)

• B8MA – Type 316F stainless steel (free-machining)

• B8D – Type 317 stainless steel

• B8PA – Type 348F stainless steel

• B8H – High hardness variant

• B8TA – Type 321H stainless steel (high carbon for strength at temp)

• B8J – Type 304H stainless steel

• B8LNA – Low carbon + nitrogen variant for enhanced strength

• B8L – Type 304L stainless steel

• B8MLNA – Type 316LN stainless steel

• B8K – Type 309 stainless steel

• B8NA – Type 347H stainless steel

• B8V – Type 304V stainless steel

• B8MNA – Type 316H stainless steel

• B8W – Type 320 stainless steel

• B8MLCuNA – Copper-bearing nitrogen enhanced 316 alloy

Special Stainless & Nickel Alloys

• B9K – Nickel-based alloy steel

• B8Z – Special corrosion-resistant stainless variant

• B8N – Nitrogen enhanced stainless

• B8MN – Modified nitrogen stainless

• B8MLCuN – Copper-nitrogen stainless alloy

• B9J – Nickel-copper alloy

• B8R – Nitronic 50 stainless steel

• B9A – Nickel-chromium alloy

• B8RA – Nitronic 60 stainless steel

• B9B – Nickel-molybdenum alloy

• B8S – Nitronic stainless steel

• B9D – Nickel-manganese alloy

• B8SA – Special austenitic stainless alloy

• B9F – Nickel-cobalt alloy

High-Temperature & Special Hardness Variants

• B94, B95, B96, B97, B98, B99, B100, B101, B102, B103 – High-temp stainless & alloy steel grades

• B8SH, B8CSH, B8PSH, B8TSH, B8NSH, B8MSH, B8YSH, B0JSH – Special hardened stainless variants

• B8M2, B8M3 – Multi-alloy enhanced 316 variants

• B9G, B9H – Nickel alloys for extreme temperature & chemical service

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International Equivalents

EN / DIN

• Stainless: 1.4301 (304), 1.4306 (304L), 1.4401 (316), 1.4404 (316L), 1.4541 (321), 1.4550 (347)

• Alloy Steel: 42CrMo4, 34CrNiMo6

JIS

• Stainless: SUS304, SUS316, SUS321, SUS347

• Alloy Steel: SCM435

GOST / Russia

• Stainless: 12X18H10T, 08X18H10

• Alloy Steel: 40X, 38XH3MFA

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Dimensions & Threads

• Diameter: M6 to M100 | ¼" to 4"

• Lengths: Up to 5 meters (custom available)

• Thread Forms: Metric (M), UNC, UNF, BSW

• Tolerance: As per ISO 4759 / ASME B1.1

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Surface Finishes & Coatings

Standard Finishes:

• Self-Colour (Black)

• Zinc Plated – white, blue, yellow passivation

• Hot-Dip Galvanized (HDG)

• Black Oxide

Advanced Coatings:

• PTFE Coating – Low friction & chemical resistance

• Xylan® Coating – Fluoropolymer coating for extreme corrosion resistance and low torque

• Geomet® Coating – Zinc-aluminum flake coating without hydrogen embrittlement

• Dacromet® Coating – High salt spray resistance for offshore applications

• Teflon® Coating – Chemical resistance and temperature stability

• Fluoropolymer Coatings – Custom blends for chemical service

• SermaGard® Coating – Ceramic-metallic protection for high heat

• Molykote® Coating – Dry film lubrication for anti-seize

• Zinc-Nickel Plating – Enhanced corrosion resistance over standard zinc

• Cadmium Plating – Superior marine/aerospace corrosion resistance (restricted use)

• Silver Plating – Conductive, anti-galling, high-temp bolting

• Phosphate Coating – Manganese/zinc phosphate for lubrication

• Nickel Plating – High hardness and wear resistance

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Applications

• Oil & gas pipelines and refineries

• Petrochemical and chemical plants

• Power generation (thermal, nuclear, renewable)

• Marine and offshore engineering

• Heavy engineering and machinery assembly

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Export Markets

• North America: USA, Canada, Mexico

• Europe: Germany, UK, France, Italy, Spain, Netherlands, Poland

• Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait

• Asia-Pacific & Japan: Japan, Singapore, Malaysia, Thailand, South Korea, Australia, New Zealand

• Africa: South Africa, Egypt, Nigeria, Kenya

• South America: Brazil, Argentina, Chile

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Packing & Logistics

• Packaging: wooden crates, pallets, cartons, polybags

• Protection: rust-preventive oil, moisture barrier wrapping

• Shipping: sea freight (FCL/LCL), air freight, express courier

• Documentation: MTCs, third-party inspection reports, origin certificates

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Why Choose Dipti Metal Industries

• Multi-standard compliance: ASTM, ASME, DIN, ISO, BS, JIS

• Ready stock for urgent projects

• Custom stud bolt manufacturing with special threads, coatings, and materials

• Global supply capability with strict quality control