Studs Manufacturer India - TUFF Fasteners

BS 4882 ASME B18.31.3 ASME B18.31.2 ASTM A307 ASTM A320 L7 ASTM F1554 ASTM A193 B8 ASTM A193 B7

Pioneer Nuts & Bolts Pvt. Ltd. — TUFF Brand

Stud / Threaded Rod

Name: Stud / Threaded Rod
Brand: TUFF
Availability: InStock

Manufacturer & Exporter · Ludhiana, Punjab · Since 1996

Stud Bolts / Threaded Rods are headless fasteners with threads at both ends — one end (the plant end) is screwed into a tapped hole in the component, and the other end (the nut end) accepts a nut to complete the joint. They are the standard fastening method for flanged pipe joints, pressure vessel covers, cylinder heads, and all applications where component removal must not require bolt withdrawal through the mating part. Pioneer manufactures stud bolts to BS 4882, and ASTM A193 in grades 8.8 through 12.9 and in alloy grades B7, B8, B8M and Gr. 660 Inconel for high-temperature and high-pressure service. Pioneer Manufactures Studs as per national and international standards providing full assurance and testing infra with our In house ISO/IEC 17025:2017 lab.

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Singapore Tested Third-party validated at accredited labs for higher strength assurance

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Japanese Technology Licensed anti-loosening fastener technology from Japan

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ISO/IEC 17025 Lab In-house accredited testing — mechanical, chemical & dimensional

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Since 1996 28+ years of precision fastener manufacturing

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Product Specifications

As per national and international standards

Parameter	Specification
Size Range (Metric)	M8M10M12M14M16M18M20M22M24M27M30M33M36M39M42M48M52M56M64M72
Size Range (Inch)	½"⅝"¾"⅞"1"1⅛"1¼"1⅜"1½"1¾"2"
Grades	Gr. 8.8Gr. 10.9Gr. 12.9ASTM A193 Gr. B7Gr. L7 / L7MGr. B8 (SS304)Gr. B8M (SS316)Gr. 660 (Inconel)
Types	BS 4882Studs for pressure vessel and flange applications (British/European piping standard)
Dimensional Standards	BritishBS 4882 — Bolting for flanges and pressure-containing purposes AmericanASTM A193 — Alloy steel and stainless steel bolting for high-temperature and high-pressure service
Chemical & Mechanical	AmericanASTM A193 Gr. B7 (alloy steel, high-temp) · ASTM A320 Gr. L7/L7M (low-temp) · ASTM A453 Gr. 660 (Inconel) InternationalEN ISO 898-1 · BS 4882
Surface Finish	Hot Dip Galvanised IS 1367 Pt.13 · IS 4759 · BS EN 1461 · ASTM A153 · ASTM A123 Black Phosphate IS 1367 Pt.12 Electro Galvanised IS 1367 Pt.11 · IS 1573 PTFE Coating ASTM D3294

Standards Reference

Standards applicable specifically to Studs — validated per product type

🇮🇳 Indian Standards (IS / BIS)

IS 4759 — Hot dip galvanised coatings on fasteners
IS 1573 — Electroplated coatings on fasteners
IS 1367 Pt.12 — Black phosphate on fasteners

🌍 ISO International Standards

ISO 898-1 — Mechanical properties of bolts, screws and studs (grade reference for stud bolts)
ISO 4759-1 — Tolerances for fasteners — bolts, screws and studs

🇩🇪 European / British (EN / BS)

BS 4882 — Bolting for flanges and pressure-containing purposes (British standard for pressure vessel and flange studs)
EN ISO 898-1 — Mechanical properties of bolts and screws
BS EN 1461 — Hot dip galvanised coatings on fabricated iron and steel articles

🇺🇸 American Standards (ASME / ASTM)

ASME B18.31.3 — Threaded rod (fully threaded stud bolts) — the primary ASME dimensional standard for metric and inch threaded rod / full-thread studs
ASME B18.31.2 — Continuous thread studs (double-end and single-end stud bolts) — dimensional standard for stud bolts in pressure and structural service
ASTM A307 — Low carbon steel bolts and studs (covers Grade A and B stud bolts at 60 ksi min tensile strength)
ASTM A320 Gr. L7 — Alloy steel bolting for low-temperature service (Cr-Mo steel, suitable to −150°F / −100°C)
ASTM F1554 — Anchor bolt studs, 36 / 55 / 105 ksi yield strength (used for foundation and anchorage stud applications)
ASTM A193 Gr. B8 — Stainless steel (SS 304) stud bolts for high-pressure and high-temperature service
ASTM A193 — Alloy steel and stainless steel bolting for high-temperature and high-pressure service (Gr. B7, B8, B8M)
ASTM A320 — Alloy steel and stainless steel bolting for low-temperature service (Gr. L7, L7M)
ASTM A453 — High-temperature bolting, Grade 660 Inconel
ASTM A307 — Low carbon steel bolts and studs (for standard-grade applications)
ASTM A153 — Hot dip galvanised coatings on iron and steel hardware

Key Features

Why engineers specify TUFF Stud / Threaded Rod

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Singapore-Validated Strength

Products additionally tested at accredited laboratories in Singapore — confirming tensile strength, yield strength, elongation, and dimensional compliance to ASTM A193 / BS 4882 requirements.

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Japanese Anti-Loosening Technology

Pioneer's licensed Japanese anti-loosening technology is directly applicable to stud bolt nut assemblies in high-vibration flanged connections — providing superior nut retention over standard hex nuts.

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ISO/IEC 17025 In-House Lab

Every batch tested in our accredited laboratory — tensile, yield, elongation, hardness, chemical composition (spectrometric), and dimensional verification with complete traceability documentation.

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Pressure Vessel & Flange Standard Grades

ASTM A193 Gr. B7 (the most widely specified grade for pressure service), Gr. B8/B8M stainless, and Gr. 660 Inconel for temperatures from -150°F to +1200°F — covering the full API / ASME code service range.

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Full Range: M8 to M72 & ½" to 2"

One of the widest standard size ranges available from an Indian manufacturer — covering all standard ASME / API flanged joint sizes from small-bore instrument connections to large-bore pipeline flanges.

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NACE / Sour Service Grades

Stud bolts conforming to NACE MR0175 / ISO 15156 hardness requirements (Rc ≤ 22 maximum for B7M grade) are available for hydrogen sulphide (H2S) sour service in oil and gas applications.

Applications

Trusted across heavy industry, infrastructure, and precision engineering

Flanged Pipe Joints (ASME B16.5 / B16.47)

Pressure Vessel Covers & Heads

Valve Bonnets & Handwheels

Heat Exchanger Channel Covers

Turbine & Compressor Casings

Boiler & Steam Drum Connections

Reactor & Autoclave Flanges

Pipeline Inline Connections

Cylinder Head Bolting (Engines)

Heavy Structural Anchor Connections

Why Pioneer — TUFF

1996

Year Established

17025

ISO/IEC Accredited Lab

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Singapore-Validated Testing

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Japanese Tech Partnership

IEC

International Export Standards

Frequently Asked Questions

Common questions about TUFF Stud / Threaded Rod

What is ASTM A193 and which grades does it cover? +

ASTM A193 is the American standard for alloy steel and stainless steel bolting materials for high-temperature and high-pressure service. The most widely used grades are: Gr. B7 (Cr-Mo alloy steel, hardened & tempered, yield 105 ksi min, max service ~500°C), Gr. B8 (SS 304, yield 30 ksi min), and Gr. B8M (SS 316). These are specified in ASME pressure vessel and piping codes worldwide.

What is BS 4882 and when is it specified? +

BS 4882 is the British standard for bolting for flanges and pressure-containing purposes — covering stud bolts for use with flanged joints in pressure piping and pressure vessel applications per British / European engineering practice. It specifies dimensions, materials, and mechanical requirements for stud bolts in BS/EN piping systems.

What is the NACE MR0175 requirement for stud bolts in sour service? +

NACE MR0175 / ISO 15156 limits the maximum hardness of carbon and low-alloy steel fasteners used in hydrogen sulphide (H2S) environments to Rockwell C 22 maximum. ASTM A193 Gr. B7M (a restricted hardness variant of B7) and matching Gr. 2HM nuts are specified for sour service piping and equipment to prevent sulphide stress cracking.

Are stud bolts available in Inconel Grade 660 for high-temperature applications? +

Yes. Stud bolts in Gr. 660 Inconel (iron-base superalloy) conforming to ASTM A453 / ASTM A638 are manufactured for bolting assemblies at elevated temperatures up to approximately 650°C — used in steam turbine casings, petrochemical high-temperature reactors, and advanced power plant flanged joints.