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Metric Grade 12.9 Studs Manufacturer & Exporter in India

Explore Metric Grade 12.9 Studs 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 Metric Grade 12.9 Studs?

Metric Grade 12.9 studs are high-strength alloy steel fasteners manufactured to ISO 898-1, designed for critical bolted joints requiring exceptional tensile and yield strength. These studs are quenched and tempered, achieving a minimum tensile strength of 1220 MPa and a yield strength of 1100 MPa, making them ideal for demanding mechanical, structural, and automotive applications.

Grade 12.9 studs are supplied with rolled ISO metric threads and are commonly used in heavy machinery, wind turbines, pressure vessels, and high-performance automotive assemblies where maximum preload and fatigue resistance are essential. All studs are batch tested for mechanical properties and supplied with full traceability and certification.

Quick Specifications

MaterialAlloy Steel (Grade 12.9)
UNS NumberK32504 (typical for 34CrNiMo6)
DIN Number1.6582
Material StandardISO 898-1
Stud Standard (Metric)DIN 976 / ISO 898-1
Stud Standard (Inch)ASME B18.31.2 (for inch series)
Thread FormISO Metric (Coarse & Fine)
Diameter RangeM6-M100
Tensile Strength1220 MPa (177 ksi) min
Yield Strength1100 MPa (160 ksi) min
Hardness39-44 HRC
? All material certified by NABL-accredited laboratory. 3.1 MTC and mechanical test reports available on request.

Complete the Fastener Set

Other Metric Grade 12.9 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Metric Grade 12.9 fastener range from certified alloy steel bar stock, including Metric Grade 12.9 Bolts, Metric Grade 12.9 Nuts, Metric Grade 12.9 Screws, Metric Grade 12.9 Washers, and Metric Grade 12.9 Threaded Rods. All Metric Grade 12.9 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Metric Grade 12.9 Bolts
Metric Grade 12.9 Nuts
Metric Grade 12.9 Screws
Metric Grade 12.9 Washers
Metric Grade 12.9 Threaded Rods

Technical Data

Metric Grade 12.9 Studs Dimensions, Sizes & Thread Standards

Metric Grade 12.9 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (full thread) / ISO 898-1. Custom lengths available in 5mm increments. Inch series available per ASME B18.31.2. All Metric Grade 12.9 studs dimensions are verified against applicable DIN, ISO, and ASME B18 standards

Stud Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.0Full20200
M81.25Full25300
M101.5Full30400
M121.75Full35500
M162.0Full40600
M202.5Full50800
M243.0Full601000
M303.5Full801200
M364.0Full1001500
M424.5Full1202000
M485.0Full1402500
M565.5Full1603000
M646.0Full1803500
M726.0Full2004000
M806.0Full2204500
M1006.0Full2505000

Dimensional & Material Standards

StandardCoversThread
DIN 976Threaded rods & studsMetric
ISO 898-1Mechanical propertiesMetric
ASME B18.31.2Continuous thread studsUNC/UNF
DIN 835Double end studsMetric
ISO 965-1Thread tolerancesMetric
Material StandardRequirement
ISO 898-1Grade 12.9 mechanical
EN 10269Alloy steel for fasteners
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Metric Grade 12.9 Stud Chemical Composition

Metric Grade 12.9 Studs are produced from medium-carbon or alloy steel with carbon (0.15–0.55%), chromium, manganese, and boron additions controlled per ASTM and ISO 898-1. Carbon content and quench-and-temper heat treatment are the primary strength levers, delivering proof loads from 580 MPa (Class 8.8) to 970 MPa (Class 12.9).

Chemical Composition per ISO 898-1 / EN 10269

ElementComposition (%)
Carbon (C)0.30-0.38%
Silicon (Si)0.10-0.35%
Manganese (Mn)0.50-0.90%
Phosphorus (P)0.035% max
Sulfur (S)0.035% max
Chromium (Cr)0.90-1.20%
Molybdenum (Mo)0.15-0.30%
Nickel (Ni)0.25% max
Boron (B)0.0015-0.003%
? All heats verified by NABL-accredited spectrometry. Chemical test reports available on request.

Why Metric Grade 12.9 Alloy Composition Matters for Studs

High Carbon & Alloy Content — Strength & Hardness
The elevated carbon, chromium, and molybdenum content in Grade 12.9 alloy steel enables quenching and tempering to achieve extreme tensile and yield strength, making these studs suitable for the most demanding bolted joints.
Boron Microalloying — Hardenability
Small additions of boron improve hardenability and ensure uniform mechanical properties throughout the stud, even in large diameters.
Strict Control of P & S — Ductility & Fatigue
Low phosphorus and sulfur levels reduce the risk of embrittlement and improve fatigue resistance, which is critical for cyclically loaded applications such as wind turbines and heavy machinery.

Fastener Performance

Metric Grade 12.9 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Metric Grade 12.9 Studs per ASTM. Metric Grade 12.9 studs achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121209545
M1629523590
M20580465140
M241000800200
M3020001600320
M3634002720460
M4252004160640
M4876006080900
?? Anti-galling: Use molybdenum-based or graphite anti-seize. Lubricated values assume K=0.14. Do not use copper-based anti-seize on high-strength alloy steel.

Industry Applications

Metric Grade 12.9 Studs Applications — Industries & End Uses

Metric Grade 12.9 Studs from RealBolt are specified across structural engineering, automotive, machinery, and pressure vessels where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Metric Grade 12.9 studs are the preferred choice for bolting critical joints in construction equipment, mining machinery, and earthmovers where maximum preload and vibration resistance are required. Their high tensile strength ensures joint integrity under dynamic loads and shock.
Used in wind turbine tower flanges, nacelle assemblies, and blade root connections, Grade 12.9 studs provide the fatigue resistance and preload retention needed for long-term reliability in harsh, cyclically loaded environments.
Engine head studs, suspension assemblies, and drivetrain components in high-performance vehicles rely on Grade 12.9 studs for their superior strength, ensuring safety and performance under extreme acceleration and braking.
Studs for pressure vessel closures, heat exchanger channel covers, and high-pressure piping flanges are often specified in Grade 12.9 for their ability to maintain clamping force at elevated pressures and temperatures.

Metric Grade 12.9 Studs Standards & International Certifications

Metric Grade 12.9 Studs 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 per ISO 4759, and proof load test records — available on request for all orders.
Standards
DIN 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367
Certifications
ISO 9001:2015CE MarkingNABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Metric Grade 12.9 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Metric Grade 12.9 Studs — 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

Metric Grade 12.9 Studs — Frequently Asked Questions

Browse expert answers to common questions about Metric Grade 12.9 Studs from RealBolt — covering property class, tensile and proof load, galvanizing embrittlement risk, surface finishes, and dimensional certification. Contact our technical team directly for project-specific guidance on Metric Grade 12.9 studs selection and pricing.
Metric Grade 12.9 studs are manufactured to DIN 976 (full thread), DIN 835 (double end), and ISO 898-1 for mechanical properties. Inch series are available to ASME B18.31.2. Custom thread forms and lengths can be supplied on request with full certification.
Use a molybdenum-based or graphite anti-seize compound (such as Molykote 1000 or Loctite LB 8008) on threads and nut faces. This prevents galling and ensures accurate preload. Avoid copper-based anti-seize, as it can cause galvanic corrosion with alloy steel. Reduce torque by 20% when lubricated.
Yes – Grade 12.9 studs are specifically designed for high fatigue resistance and preload retention, making them ideal for wind turbines, heavy machinery, and automotive engines. Their alloy composition and heat treatment ensure consistent performance under repeated loading.
No MOQ for standard sizes (M12-M36) available ex-stock – single pieces can be supplied for urgent repairs. Custom sizes or special thread forms typically require a 10 kg minimum. Price breaks are available at 50, 200, and 500 pieces.

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