+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

ASTM A307 Grade A Nuts Manufacturer & Exporter in India

Explore ASTM A307 Grade A Nuts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 A Nuts?

ASTM A307 Grade A nuts are carbon steel fasteners manufactured to meet the requirements of ASTM A563 and ASTM A307 standards. These nuts are designed for use with low-carbon steel bolts and threaded rods in general-purpose, non-critical applications where high strength is not required. ASTM A307 Grade A nuts are commonly supplied as hex nuts, finished hex nuts, and heavy hex nuts, and are suitable for use in structural, construction, and light industrial assemblies.

These nuts are widely specified for use with ASTM A307 Grade A bolts and threaded rods in building construction, machinery, and OEM assemblies. They are available in both plain and zinc-plated finishes, providing basic corrosion resistance for indoor and mild outdoor environments.

Quick Specifications

MaterialCarbon Steel
ASTM GradeA307 Grade A
Nut StandardASTM A563
Common Nut TypesHex Nut, Heavy Hex Nut, Finished Hex Nut
Thread FormUNC / UNF / Metric Coarse
Diameter Range1/4"-4" (M6-M100)
Tensile StrengthMin 60 ksi (414 MPa)
Proof Load90 ksi (620 MPa) max
Hardness116-302 HV
FinishPlain, Zinc Plated, Hot Dip Galvanized
? All nuts supplied with full traceability and test certification. Third-party inspection available.

Complete the Fastener Set

Other ASTM A307 Grade A Fastener Products Available from RealBolt

RealBolt also manufactures the complete ASTM A307 Grade A fastener range — ASTM A307 Grade A Bolts, ASTM A307 Grade A Screws, ASTM A307 Grade A Washers, ASTM A307 Grade A Studs, ASTM A307 Grade A 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 A Bolts
ASTM A307 Grade A Screws
ASTM A307 Grade A Washers
ASTM A307 Grade A Studs
ASTM A307 Grade A Threaded Rods

Technical Data

ASTM A307 Grade A Nuts Dimensions, Sizes & Thread Standards

ASTM A307 Grade A Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per ASME B18.2.2 (inch hex nuts), DIN 934 (metric hex nuts), and ASTM A563. Custom sizes and finishes available on request. All ASTM A307 Grade A nuts dimensions are verified against applicable DIN, ISO, and

Hex Nut Dimensions - Inch (ASME B18.2.2)

Nominal Size (in)Width Across Flats (in)Height (in)Thread Pitch (UNC)
1/47/167/3220
5/161/217/6418
3/89/1621/6416
1/23/47/1613
5/815/1635/6411
3/41-1/841/6410
11-1/27/88
1-1/41-7/81-5/327
1-1/22-1/41-11/326
231-25/324.5

Dimensional & Material Standards

StandardCoversThread
ASME B18.2.2Hex & heavy hex nuts (inch)UNC/UNF
DIN 934Hex nuts (metric)Metric
ISO 4032Hex nuts (metric)Metric
ASTM A563Carbon steel nutsUNC/UNF
ASTM F594Stainless steel nutsUNC/UNF
Material StandardRequirement
ASTM A307Bolts & rods - Grade A
ASTM A563Nuts - mechanical & chemical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A307 Grade A Chemical Composition

ASTM A307 Grade A 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 A563 & A307

ElementComposition (%)
Carbon (C)0.27% max
Manganese (Mn)0.60-0.90%
Phosphorus (P)0.12% max
Sulfur (S)0.15% max
Iron (Fe)Balance
? All heats verified by spectrometry. Material test certificates supplied with every batch.

Why ASTM A307 Grade A Alloy Composition Matters for Nuts

Low Carbon Content
The low carbon content ensures good ductility and weldability, making ASTM A307 Grade A nuts suitable for general construction and structural applications.
Manganese for Strength
Manganese improves the strength and toughness of the nuts, providing reliable performance in bolted assemblies subjected to moderate loads.
Controlled Phosphorus & Sulfur
Phosphorus and sulfur are kept low to maintain machinability and prevent embrittlement, ensuring consistent thread quality and assembly performance.

Fastener Performance

ASTM A307 Grade A Nuts Mechanical Properties & Torque Reference

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

Nut SizeRecommended Torque (Nm)Proof Load (kN)
1/4"87.5
3/8"2718.5
1/2"6730.5
5/8"13548.5
3/4"24071.5
1"480114.5
1-1/4"970181.5
1-1/2"1700261.5
?? Assembly Note: Always use compatible A307 Grade A bolts or rods. Lubricate threads for consistent preload. Torque values are for plain finish; reduce by 15% for lubricated or zinc-plated nuts.

Industry Applications

ASTM A307 Grade A Nuts Applications — Industries & End Uses

ASTM A307 Grade A 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 A nuts are widely used in steel building frames, bridges, and general structural connections where moderate strength and reliable assembly are required. They are paired with A307 Grade A bolts and rods for beam-to-column, girder, and bracing connections.
Used in light machinery, equipment frames, and OEM assemblies, these nuts provide secure fastening for non-critical joints, covers, and housings where high strength is not essential.
ASTM A307 Grade A nuts are specified for ductwork, HVAC supports, and hanger assemblies, offering easy installation and compatibility with standard threaded rods and bolts.
Common in conveyors, agricultural implements, and light-duty industrial equipment, these nuts ensure reliable fastening in low-stress environments.

ASTM A307 Grade A Nuts Standards & International Certifications

ASTM A307 Grade A 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 MarkingThird Party Inspection

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

Partner with RealBolt — India’s leading manufacturer of certified ASTM A307 Grade A 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.
022-6743-7972
+91 90226 36025
Email Us

Answers for Buyers

ASTM A307 Grade A Nuts — Frequently Asked Questions

Browse expert answers to common questions about ASTM A307 Grade A 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 A nuts selection and pricing.
ASTM A307 Grade A nuts are manufactured to ASTM A563 (mechanical and chemical requirements) and are dimensionally compliant with ASME B18.2.2 (inch series) or DIN 934/ISO 4032 (metric series). They are suitable for use with A307 Grade A bolts and threaded rods in general-purpose applications.
Yes, ASTM A307 Grade A nuts are available in plain (black), zinc-plated, and hot-dip galvanized finishes. Zinc plating provides moderate corrosion resistance for indoor use, while hot-dip galvanizing is recommended for outdoor or exposed environments. Always match the nut finish to the bolt or rod for optimal performance.
Absolutely. ASTM A307 Grade A nuts are commonly specified for structural steelwork, including beam-to-column, bracing, and girder connections, when paired with A307 Grade A bolts or rods. For higher strength requirements, consider ASTM A325 or A563 Grade DH nuts.
Standard sizes (1/4″-1-1/2″) are available ex-stock with no formal MOQ-single-piece orders are accepted for urgent needs. Custom sizes or finishes may require a minimum order of 10 kg or 100 pieces. Quantity discounts apply for bulk orders.

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