Post On : 8 December 2025 | Read Time : 10 Min

DIN 975 Threaded Rods Grade 8.8 & 10.9 Specification Guide

DIN 975 fully threaded rods are a core fastener for structural, mechanical, and industrial projects where adjustability, clamping force, and reliable tensioning matter. At Husaini Brothers, we supply DIN 975 threaded rods in Grade 8.8 and Grade 10.9 to customers across the GCC, and beyond.

This guide explains what DIN 975 is, how Grade 8.8 and Grade 10.9 differ, and when engineers, fabricators, and project buyers should choose each strength class.

What Is DIN 975?

DIN 975 is a German standard that specifies the dimensions and tolerances for fully threaded rods (also called threaded bars, all-thread, or studs). These rods:

Are threaded along their entire length
Use ISO metric thread profiles (coarse threads per ISO 261 / ISO 965)
Are commonly supplied in 1,000 mm (1 meter) and 2,000 mm (2 meters) lengths
Can be cut to custom lengths for non-standard applications

DIN 975 has largely been superseded in scope by DIN 976-1, but it remains widely used in specifications, catalogs, and procurement documents worldwide.

DIN 975 Grade 8.8 Overview

Grade 8.8 refers to the mechanical strength class of the threaded rod, according to ISO property classes.

Material: Medium carbon steel, quenched and tempered
Tensile strength: 800 MPa (approx.)
Yield strength: 640 MPa (approx.)
Equivalent to ISO Property Class 8.8 under ISO 898-1

Grade 8.8 gives a strong, reliable threaded rod suitable for most structural and mechanical applications where high but not extreme strength is required.

Purpose of DIN 975 Grade 8.8 Threaded Rods

DIN 975 Grade 8.8 threaded rods are designed to:

Provide a strong and versatile threaded fastener for structural, mechanical, and industrial assemblies
Join components using nuts and washers where precise adjustability, clamping, or tensioning is needed
Be cut to custom lengths where standard bolts are too short or impractical

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Benefits of Grade 8.8 Threaded Rods

Benefit	Details
High Strength	Grade 8.8 offers excellent tensile and yield strength for demanding but standard structural and mechanical applications.
Fully Threaded	Full-length thread engagement with nuts allows easy adjustment and cutting to shorter custom lengths.
Versatility	Suitable for structural, mechanical, electrical, HVAC, and general industrial assemblies.
Easy to Customise	Can be cut, chamfered, and finished as required for special connections or site conditions.
Widely Available	Common in construction and industry, with standard diameters and coatings easily sourced.
Thread Compatibility	ISO metric threads compatible with DIN / ISO nuts, washers, and structural hardware.

Applications DIN 975 Grade 8.8

DIN 975 Grade 8.8 threaded rods are used across sectors where moderate to high-strength fastening is required.

Sector	Typical Applications
Construction	Structural steel assemblies, concrete anchors, curtain wall and facade systems.
Mechanical Engineering	Machine frames, equipment supports, vibration mounts, jigs and fixtures.
Electrical & HVAC	Suspended cable trays, duct supports, pipe hangers, ceiling systems.
Industrial Plants	Pipe supports, flanged joints, tank installations, process equipment mounts.
Infrastructure	Bridge components, railings, utility pole hardware, tunnel and substation fittings.
Custom Fabrication	Any situation where standard bolts are too short or need modification.

Applications of DIN 975 Grade 8.8 threaded rods in construction and industry

Technical Specifications Grade 8.8

Standard	DIN 975 (replaced in scope by DIN 976-1 in some references)
Material	Medium carbon steel, quenched and tempered
Strength Grade	8.8 (Tensile strength ~800 MPa, yield strength ~640 MPa)
Thread	ISO metric coarse thread (e.g., M6, M8, M10, M12, etc.)
Length	Typically 1,000 mm or 2,000 mm, with custom cut lengths available
Finish	Plain, zinc plated, hot-dip galvanized, or black oxide depending on application

DIN 975 Grade 10.9 Overview

Grade 10.9 is a high-strength alloy steel class used where very high preload and load-bearing capacity are required.

Material: High-strength alloy steel, quenched and tempered
Tensile strength: approx. 1,040 MPa
Yield strength: approx. 940 MPa
Significantly stronger than Grade 8.8

DIN 975 Grade 10.9 threaded rods are chosen for critical structural or dynamic-load applications where high clamping force and reliable preload retention are essential.

Purpose of DIN 975 Grade 10.9 Threaded Rods

Grade 10.9 threaded rods are used to:

Act as a strong and adjustable fastener in assemblies with high preload requirements
Replace standard bolts where custom lengths or long engagement lengths are needed
Perform reliably in dynamic, vibrating, or high-stress environments

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Benefits of DIN 975 Threaded Rod Grade 10.9

Benefit	Description
Very High Strength	Offers significantly higher tensile and yield strength than 8.8 or 5.8 grades, ideal for critical joints.
Fully Threaded	Allows nuts and washers to be placed anywhere along the length, giving maximum flexibility in installation.
Cut to Length	Can be cut to any required length in the workshop or on site for project-specific details.
Versatile Use	Compatible with ISO metric nuts and washers (e.g., DIN 934, DIN 125 and related hardware).
Safe for Critical Loads	Suitable for dynamic, vibrating, or seismic applications due to high clamping force and preload retention.
Coating Options	Available in plain, zinc plated, hot-dip galvanized, or black oxide finishes for different environments.

Applications DIN 975 Grade 10.9

Grade 10.9 threaded rods (DIN 975) are used where very high strength and reliable preload are required.

Sector	Examples
Construction	Steel frameworks, seismic bracing, anchor bolts in tension zones, heavy baseplates.
Industrial Machinery	High-load machine bases, press frames, torque-heavy connections.
Power Plants	Pipe supports, turbine foundations, transformer anchoring.
Mechanical Engineering	Precision assemblies, motor and gearbox mounts, high-torque joints.
Infrastructure	Bridge supports, retaining systems, expansion joints, structural skids.
Oil, Gas & Offshore	Structural skids, equipment supports exposed to vibration or fatigue.

Applications of DIN 975 Grade 10.9 threaded rods in heavy industrial and structural projects

Technical Specifications Grade 10.9

Standard	DIN 975 (referenced alongside DIN 976-1 in some standards)
Material	High-strength alloy steel, quenched and tempered
Strength Class	10.9 (tensile strength ~1,040 MPa, yield strength ~940 MPa)
Thread	ISO metric coarse thread, fully threaded
Lengths	Typically 1,000 mm or 2,000 mm, with custom lengths available
Finish Options	Plain, zinc plated, hot-dip galvanized, black oxide depending on environment
Reusability	In critical load applications, not typically reused if stressed beyond yield or visibly deformed.

Grade 8.8 vs 10.9 Which DIN 975 Threaded Rod Should You Choose?

Both grades follow the DIN 975 dimensional standard but offer different strength levels. The choice depends mainly on load, safety factors, environment, and cost.

Parameter	Grade 8.8	Grade 10.9
Strength Level	High strength for most structural and mechanical needs.	Very high strength for critical and high-preload joints.
Typical Use	General construction, MEP, machinery, plant supports.	Seismic bracing, heavy machinery, power plants, high-stress industrial applications.
Cost	More economical; often sufficient for most BOQ items.	Higher cost; used where design specifically demands 10.9.
Dynamic Loads	Suitable for moderate dynamic loads when correctly sized.	Preferred for vibration, fatigue, and high dynamic loading.
Specification Approach	Use when standard high-strength threaded rod is specified.	Use when consultant or code clearly requires 10.9 or higher property class.

For value, many projects specify Grade 8.8 as the default. Grade 10.9 is reserved for locations where structural calculations, vibration, or safety factors justify the extra strength and cost.

Why Engineers Choose Husaini Brothers for DIN 975

As a long-established fastener manufacturer and supplier for the GCC region, Husaini Brothers supports projects from Dubai and Abu Dhabi to Riyadh, NEOM, and Jubail with:

Stocked and project-based supply of DIN 975 threaded rods in Grade 8.8 and 10.9
Cut-to-length services for special anchor and assembly requirements
Material and coating recommendations based on environment and design life
Support in mapping consultant specifications and BOQs to practical, deliverable items

Whether you are standardising MEP supports, finalising steel connection details, or preparing a shutdown materials list, our team can help you choose the right DIN 975 threaded rod configuration.

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