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Metric Grade 12.9 Threaded Rods Manufacturer & Exporter in India

Explore Metric Grade 12.9 Threaded Rods 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 Threaded Rods?

Metric Grade 12.9 threaded rods are high-strength carbon alloy steel fasteners manufactured to ISO 898-1 and EN 14399 standards. These rods are fully threaded along their length and are engineered for critical bolted joints requiring exceptional tensile and yield strength. Grade 12.9 designates a minimum tensile strength of 1220 MPa and a minimum yield strength of 1100 MPa, making them ideal for demanding structural, mechanical, and heavy machinery applications.

Metric Grade 12.9 threaded rods are commonly supplied in black oxide, zinc-plated, or phosphate finishes for corrosion resistance. They are widely specified for bolted connections in steel structures, wind turbines, heavy equipment, and precision machinery where maximum preload and minimal elongation are essential.

Quick Specifications

MaterialAlloy Steel (Grade 12.9)
StandardISO 898-1 / EN 14399
Thread FormISO Metric (Coarse & Fine)
Diameter RangeM6-M100
Length Range100 mm - 3000 mm
Tensile Strength1220 MPa min
Yield Strength1100 MPa min
Hardness39-44 HRC
FinishBlack oxide, Zinc plated, Phosphate
CertificationEN 10204 3.1 / 3.2
? All rods supplied with full mechanical and chemical test reports. Third-party inspection available.

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 Studs. 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 Studs

Technical Data

Metric Grade 12.9 Threaded Rods Dimensions, Sizes & Thread Standards

Metric Grade 12.9 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Manufactured to ISO 898-1 and DIN 976-1. Custom lengths available in 10 mm increments. Metric coarse and fine threads per ISO 261/965. Inch sizes available on request.

Threaded Rod Dimensions - Metric (DIN 976-1)

Size (M)Pitch (mm)Core Dia (mm)Max Length (mm)
M61.04.7731000
M81.256.4662000
M101.58.1592000
M121.759.8532000
M162.013.5463000
M202.517.1883000
M243.020.8633000
M303.526.8973000
M364.032.9303000
M424.538.9643000
M485.045.0003000
M565.553.0003000
M646.061.0003000
M726.069.0003000
M806.077.0003000
M1006.097.0003000

Dimensional & Material Standards

StandardCoversThread
DIN 976-1Threaded rods, full threadMetric
ISO 898-1Mechanical propertiesMetric
EN 14399-4Structural bolting assembliesMetric
ASME B18.31.3Threaded rods (inch)UNC/UNF
Material StandardRequirement
ISO 898-1Grade 12.9 mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC
ISO 4042Coating/finish

Material Chemistry

Metric Grade 12.9 Threaded Rod Chemical Composition

Metric Grade 12.9 Threaded Rods 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

ElementComposition (%)
Carbon (C)0.30-0.50
Manganese (Mn)0.50-1.30
Phosphorus (P)0.035 max
Sulfur (S)0.035 max
Silicon (Si)0.15-0.35
Chromium (Cr)0.30 max
Nickel (Ni)0.30 max
Molybdenum (Mo)0.20 max
Boron (B)0.003-0.005
? All heats verified by spectrometry. Full chemical analysis supplied with each batch.

Why Metric Grade 12.9 Alloy Composition Matters for Threaded Rods

High Carbon Content (0.30–0.50%)
Delivers the high tensile and yield strength required for Grade 12.9, ensuring the rod can withstand extreme preload and dynamic loads without permanent deformation.
Boron Microalloying
Boron additions improve hardenability and strength uniformity throughout the rod, especially in larger diameters, ensuring consistent mechanical properties along the full length.
Low Phosphorus & Sulfur
Strict limits on P and S prevent embrittlement and ensure ductility, toughness, and reliable performance in critical bolted joints.

Fastener Performance

Metric Grade 12.9 Threaded Rods Mechanical Properties & Torque Reference

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

Rod SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121209670
M16295236144
M20580464225
M241000800325
M3020001600470
M3635002800680
M4252004160950
M48750060001300
?? Anti-galling: Use molybdenum-based or graphite anti-seize. Lubricated values assume K=0.14. Avoid over-torquing to prevent thread stripping.

Industry Applications

Metric Grade 12.9 Threaded Rods Applications — Industries & End Uses

Metric Grade 12.9 Threaded Rods 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.
Wind Turbine & Power Plant Construction
Precision Engineering & Tooling
Metric Grade 12.9 threaded rods are the preferred choice for bolted joints in steel structures, heavy machinery, and wind turbine towers where high preload and minimal elongation are critical. Used in base plate anchoring, column splices, and machinery foundation connections.
Used in suspension, chassis, and engine assemblies for motorsport and automotive applications where maximum strength and fatigue resistance are required. Also specified for custom roll cages and subframe connections.

Metric Grade 12.9 Threaded Rods Standards & International Certifications

Metric Grade 12.9 Threaded Rods 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 975 DIN 976-1 ASME B18.31.2 IS 1367 IS 1364
Certifications
ISO 9001:2015EN 10204 3.1/3.2CE MarkingPED 2014/68/EU

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

Partner with RealBolt — India’s leading manufacturer of certified Metric Grade 12.9 Threaded Rods — 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
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Answers for Buyers

Metric Grade 12.9 Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about Metric Grade 12.9 Threaded Rods 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 threaded rods selection and pricing.
Metric Grade 12.9 threaded rods are manufactured to ISO 898-1 for mechanical properties and DIN 976-1 for dimensions. EN 14399-4 covers structural bolting assemblies. Inch series rods are available to ASME B18.31.3. All rods are supplied with EN 10204 3.1/3.2 certification.
Hot-dip galvanizing is not recommended for Grade 12.9 rods, as the process can reduce mechanical properties due to hydrogen embrittlement. For corrosion resistance, use zinc-plated, phosphate, or black oxide finishes, or specify stainless steel rods for aggressive environments.
The maximum recommended service temperature for Metric Grade 12.9 threaded rods is 300°C. Above this, the mechanical properties may degrade. For higher temperature applications, consider alloy steel or stainless steel threaded rods rated for elevated temperatures.
No, Grade 12.9 threaded rods are not recommended for welding due to their high carbon and alloy content, which can cause cracking and loss of mechanical properties. If welding is required, use lower strength grades or consult with a metallurgist for suitable alternatives.

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
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  • Sanand
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Countries We Export To:

  • US
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  • Oman
  • Kuwait
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