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ASTM A307 Grade B Nuts Manufacturer & Exporter in India

Explore ASTM A307 Grade B Nuts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are ASTM A307 Grade B Nuts?

ASTM A307 Grade B nuts are carbon steel fasteners designed for use with ASTM A307 Grade B bolts and threaded rods in medium-strength, high-pressure piping and structural applications. Manufactured from low-carbon steel, these nuts are typically supplied as heavy hex pattern per ASME B18.2.2, ensuring compatibility with flanged joints and pressure vessel assemblies.

ASTM A307 Grade B nuts are widely specified for use in piping systems, pressure vessels, and structural steel connections where moderate strength and reliable performance are required. They are suitable for both black and hot-dip galvanized finishes, and are commonly used in conjunction with A307 Grade B bolts for flange bolting in refineries, power plants, and general construction.

Quick Specifications

MaterialCarbon Steel
ASTM GradeA307 Grade B
UNS NumberK02200
DIN Number1.1151
Material StandardASTM A307
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormUNC / UNF / Metric Coarse
Diameter RangeM6-M100 / ¼"-4"
Proof Load120 MPa (17 ksi) min
Hardness116 HB max
? All nuts supplied with full traceability and test certification. Galvanized and black finishes available.

Complete the Fastener Set

Other ASTM A307 Grade B Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A307 Grade B fastener range — ASTM A307 Grade B Bolts, ASTM A307 Grade B Screws, ASTM A307 Grade B Washers, ASTM A307 Grade B Studs, ASTM A307 Grade B Threaded Rods — from certified bar stock per ASTM with full EN 10204 MTC 3.1/3.2 documentation and fast Mumbai dispatch.
ASTM A307 Grade B Bolts
ASTM A307 Grade B Screws
ASTM A307 Grade B Washers
ASTM A307 Grade B Studs
ASTM A307 Grade B Threaded Rods

Technical Data

ASTM A307 Grade B Nuts Dimensions, Sizes & Thread Standards

ASTM A307 Grade B Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASME B18.2.2 (inch series) and DIN 934 / ISO 4032 (metric series). Heavy hex pattern for flange bolting. Custom sizes available on request. All ASTM A307 Grade B nuts dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Heavy Hex Nut Dimensions - Inch (ASME B18.2.2)

Nominal Size (in)Width Across Flats (in)Height (in)Thread Pitch
¼0.6880.344UNC 20
?0.9380.438UNC 16
½1.1250.562UNC 13
?1.3120.688UNC 11
¾1.5000.812UNC 10
11.8751.000UNC 8
1¼2.4381.250UNC 7
1½2.7501.500UNC 6
23.6252.000UNC 4.5
2½4.3752.500UNC 4
35.0003.000UNC 4
46.0004.000UNC 4

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Width Across Flats (mm)Height (mm)Thread Pitch
M61051.0
M8136.51.25
M101781.5
M1219101.75
M1624132.0
M2030162.5
M2436193.0
M3046243.5
M3655294.0
M4265344.5
M4875385.0
M5685455.5
M6495516.0
M72105586.0
M80115656.0
M100145806.0

Dimensional & Material Standards

StandardCoversThread
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASTM A563Carbon steel nutsUNC/UNF
BS 4190Hex nutsMetric/BSW
Material StandardRequirement
ASTM A307Carbon steel, Grade B
ASTM A563Mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A307 Grade B Chemical Composition

ASTM A307 Grade B Nuts are manufactured from chromium-molybdenum alloy steel with Cr (0.8–1.1%), Mo (0.15–0.65%), and vanadium additions in B16 grades, controlled per ASTM and ASME SA-193. Cr-Mo additions raise hardenability and creep rupture strength for pressure vessel service; vanadium in B16 extends the allowable service temperature to 538°C.

Chemical Composition per ASTM A307

ElementComposition (%)
Carbon (C)0.27 max
Manganese (Mn)0.60-0.90
Phosphorus (P)0.04 max
Sulfur (S)0.15 max
Iron (Fe)Balance
? All heats verified by spectrometry. Material test certificates provided with every batch.

Why ASTM A307 Grade B Alloy Composition Matters for Nuts

Low Carbon Content — Ductility & Weldability
The low carbon content (=0.27%) ensures good ductility and weldability, making ASTM A307 Grade B nuts suitable for structural and piping applications where field welding may be required.
Manganese — Strength & Toughness
Manganese (0.60–0.90%) improves the strength and toughness of the nut, providing reliable performance under moderate loads and vibration.
Phosphorus & Sulfur Control — Prevents Brittleness
Strict limits on phosphorus and sulfur prevent embrittlement, ensuring the nuts maintain integrity during tightening and service.

Fastener Performance

ASTM A307 Grade B Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for ASTM A307 Grade B Nuts per ASTM. ASTM A307 Grade B nuts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Recommended Nut Tightening Torques - ASTM A307 Grade B

Nut SizeDry Torque (Nm)Lubricated Torque (Nm)Recommended Clamp Load (kN)
M12453618
M161108832
M2022017651
M2438030473
M30750600115
M3613001040166
M4220001600230
M4829002320300
?? Note: Lubricated values assume K=0.16. Always use a calibrated torque wrench for critical bolted joints.

Industry Applications

ASTM A307 Grade B Nuts Applications — Industries & End Uses

ASTM A307 Grade B Nuts from RealBolt are specified across oil and gas pressure vessels, power generation, and petrochemical where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
ASTM A307 Grade B nuts are widely used for bolting flanges, valves, and fittings in oil and gas piping systems, including refineries, terminals, and process plants. Their heavy hex pattern ensures proper load distribution and compatibility with standard flange bolting.
These nuts are specified for structural steel connections, including beam-to-column joints, base plates, and bracing assemblies in commercial buildings, bridges, and industrial structures. Their moderate strength and availability in large sizes make them ideal for general construction.
Used for securing pipe supports, equipment bases, and flange joints in water treatment facilities and power generation plants, ASTM A307 Grade B nuts provide reliable performance in both indoor and outdoor environments.
ASTM A307 Grade B nuts are used in HVAC ducting, fire protection piping, and sprinkler system installations, where moderate strength and corrosion resistance (when galvanized) are required.

ASTM A307 Grade B Nuts Standards & International Certifications

ASTM A307 Grade B Nuts from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, hardness test certificate, dimensional inspection report, and proof load test records — available on request for all orders.
Standards
DIN 934 DIN 980 DIN 982 DIN 985 DIN 439 DIN 557 DIN 562 ISO 4032 ISO 7040 ASME B18.2.2 EN ISO 4032 BS EN ISO 4032 IS 1363 IS 1364 IS 6623 IS 3757 SAE J995 SAE J1199 UNI 5588 CSN 021123 PN 82144
Certifications
ISO 9001:2015EN 10204 3.1PED 2014/68/EUCE Marking

Buy ASTM A307 Grade B Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified ASTM A307 Grade B Nuts — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
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Answers for Buyers

ASTM A307 Grade B Nuts — Frequently Asked Questions

Browse expert answers to common questions about ASTM A307 Grade B Nuts from RealBolt — covering ASTM A193 grade, proof load, creep ratings, cryogenic L7 limits, coating options, and EN 10204 documentation. Contact our technical team directly for project-specific guidance on ASTM A307 Grade B nuts selection and pricing.
ASTM A307 Grade B nuts are manufactured to ASTM A307 and typically supplied as heavy hex pattern per ASME B18.2.2 (inch series) or DIN 934 / ISO 4032 (metric series). They also comply with ASTM A563 for mechanical properties and are compatible with BS 4190 for structural applications.
Yes, ASTM A307 Grade B nuts are available in both black (plain) and hot-dip galvanized finishes. Galvanized nuts are recommended for outdoor, marine, or corrosive environments and are supplied to meet ASTM A153 or ISO 1461 coating standards.
ASTM A307 Grade B nuts are intended for ambient and moderately elevated temperatures (up to 300°C). For higher temperature applications, consider using alloy steel or stainless steel nuts designed for elevated temperature service.
Standard sizes (M12-M36, ½”-1½”) are available ex-stock with no formal MOQ – single-piece orders are accepted for urgent requirements. Custom sizes or finishes may require a minimum order of 25 kg or 100 pieces, depending on size and finish.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil