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ASTM A307 Grade A Screws Manufacturer & Exporter in India

Explore ASTM A307 Grade A Screws 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 A Screws?

ASTM A307 Grade A screws are carbon steel fasteners manufactured to the ASTM A307 specification, designed for general-purpose, low-carbon steel applications. These screws are commonly used for non-critical structural, construction, and machinery fastening where moderate strength and cost-effectiveness are required. Grade A covers bolts, screws, and studs with a minimum tensile strength of 60 ksi (414 MPa), making them suitable for a wide range of everyday bolting tasks.

ASTM A307 Grade A screws are available in a variety of head styles and thread forms, including hex head, round head, and square head, with both coarse (UNC) and fine (UNF) threads. They are widely specified for use in building construction, OEM assemblies, and maintenance applications where high strength or corrosion resistance is not a primary concern.

Quick Specifications

MaterialCarbon Steel
ASTM GradeA307 Grade A
UNS NumberK02200
DIN Number1.1151
Material StandardASTM A307
Screw Standard (Metric)DIN 933 / ISO 4017
Screw Standard (Inch)ASME B18.6.1 / B18.2.1
Thread FormUNC / UNF / Metric Coarse
Diameter RangeM6-M36 / 1/4"-1 1/2"
Tensile Strength414 MPa (60 ksi) min
Yield Strength207 MPa (30 ksi) min
HardnessMax 85 HRB
? All material certified by NABL-accredited laboratory. Test reports available on request.

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 Nuts, 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 Nuts
ASTM A307 Grade A Washers
ASTM A307 Grade A Studs
ASTM A307 Grade A Threaded Rods

Technical Data

ASTM A307 Grade A Screws Dimensions, Sizes & Thread Standards

ASTM A307 Grade A Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 933 (full thread) / ISO 4017 (full thread) / ASME B18.6.1. Custom lengths available in 5mm increments. Inch dimensions per ASME B18.2.1. All ASTM A307 Grade A screws dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Hex Head Screw Dimensions - Metric (DIN 933 / ISO 4017)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0106.012200
M81.25138.016250
M101.51710.020300
M121.751912.025400
M162.02416.030500
M202.53020.035600
M243.03624.040600
M303.54630.050800
M364.05536.0601000

Dimensional & Material Standards

StandardCoversThread
DIN 933Hex screws, full threadMetric
ISO 4017Hex head screws, fullMetric
ASME B18.6.1Machine screwsUNC/UNF
ASME B18.2.1Hex & heavy hex screwsUNC/UNF
Material StandardRequirement
ASTM A307Carbon steel screws
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

ASTM A307 Grade A Chemical Composition

ASTM A307 Grade A Screws 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)0.60-1.20%
Phosphorus (P)0.04% max
Sulfur (S)0.15% max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. Chemical test reports available on request.

Why ASTM A307 Grade A Alloy Composition Matters for Screws

Low Carbon Content
The low carbon content (=0.27%) ensures good ductility and weldability, making ASTM A307 Grade A screws suitable for general construction and assembly applications.
Manganese for Strength
Manganese (0.60–1.20%) improves tensile strength and toughness, providing reliable performance in non-critical bolted joints.
Controlled Phosphorus & Sulfur
Phosphorus and sulfur are tightly controlled to prevent brittleness and ensure consistent machinability and thread formation.

Fastener Performance

ASTM A307 Grade A Screws Mechanical Properties & Torque Reference

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

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M8231812
M10463719
M12806428
M1620016057
M2039031289
M24670536128
M3013501080210
?? Assembly: Use light machine oil for lubrication. Lubricated values assume K=0.16. For structural applications, always follow project-specific torque procedures.

Industry Applications

ASTM A307 Grade A Screws Applications — Industries & End Uses

ASTM A307 Grade A Screws 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 screws are widely used for fastening steel to steel, wood to steel, and other general construction connections in buildings, bridges, and light structural assemblies. Suitable for non-critical joints where moderate strength is sufficient.
Used in original equipment manufacturing for machinery assembly, enclosures, and non-pressure retaining components. Preferred for cost-effective, reliable fastening in low-stress applications.
Ideal for securing duct flanges, supports, and hangers in heating, ventilation, and air conditioning systems. The screws provide easy installation and adequate strength for light mechanical assemblies.
Commonly specified for furniture, shelving, and fixture assembly where ease of installation and moderate load capacity are required. Compatible with wood, plastic, and metal substrates.

ASTM A307 Grade A Screws Standards & International Certifications

ASTM A307 Grade A Screws 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 84 DIN 85 DIN 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 DIN 7984 DIN 7985 DIN 7991 DIN 965 ISO 4762 ISO 10642 ISO 14579 ASME B18.3 ASME B18.6.3 EN ISO 4762 IS 1363 IS 1367 SAE J933 SAE J1199
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified ASTM A307 Grade A Screws — 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 A Screws — Frequently Asked Questions

Browse expert answers to common questions about ASTM A307 Grade A Screws 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 screws selection and pricing.
ASTM A307 Grade A screws are available to DIN 933 (metric full thread), ISO 4017, ASME B18.6.1 (machine screws), and ASME B18.2.1 (inch hex screws). Custom thread forms such as BSW, BSF, and metric fine are available on request with short lead times.
ASTM A307 Grade A screws can be supplied plain (self-color), zinc plated, hot-dip galvanized, or mechanically galvanized. Zinc plating provides moderate corrosion resistance for indoor use, while hot-dip galvanizing is recommended for outdoor or exposed environments.
ASTM A307 Grade A screws are suitable for non-critical structural steel connections, such as bracing, light framing, and secondary members. For primary load-bearing joints or high-strength applications, use ASTM A325 or A490 bolts instead.
No formal MOQ for standard sizes (M8-M24) held in stock – we supply from single pieces for urgent requirements. Custom sizes or finishes may require a minimum order of 25 kg. Quantity discounts available at 100 pcs, 500 pcs, and 1000 pcs.

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
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  • 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
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  • Vietnam
  • South Korea
  • Japan
  • Brazil