8 Dec 2025
Husaini Brothers
Threaded Rods
DIN 975 threaded rods are among the most widely used fastening components across construction, oil & gas, and industrial manufacturing sectors. Available in Grade 8.8 and Grade 10.9, these fully threaded bars provide exceptional tensile strength and reliability for both structural and mechanical applications.
In this guide, we break down the key specifications, mechanical properties, sizing standards, and selection criteria to help engineers, contractors, and procurement teams choose the right threaded rod for their project.
What is DIN 975?
DIN 975 is a German industrial standard that defines the dimensions and tolerances for fully threaded metric studs and rods. These rods are typically supplied in standard lengths of 1 meter or 3 meters and can be cut to size based on project requirements.
Grade 8.8 vs Grade 10.9: Mechanical Properties
The grade designation indicates the mechanical strength of the threaded rod. Grade 8.8 offers a balance of strength and ductility suitable for general structural use, while Grade 10.9 is designed for higher load-bearing applications.
| Property | Grade 8.8 | Grade 10.9 |
|---|---|---|
| Tensile Strength | 800 MPa | 1040 MPa |
| Yield Strength | 640 MPa | 940 MPa |
| Hardness (HV) | 255–335 | 320–380 |
| Material | Medium Carbon Steel | Alloy Steel |
| Common Coating | Plain / Zinc Plated | Plain / HDG |
Available Sizes & Diameters
DIN 975 threaded rods are manufactured in a wide range of metric sizes to suit different load requirements:
- M6, M8, M10, M12, M16, M20, M24, M30, M36, M42, M48
- Standard lengths: 1000mm and 3000mm (custom cutting available)
- Thread pitch: Coarse and fine pitch options available
Surface Finishes & Coatings
Choosing the right surface finish is critical for corrosion resistance and longevity, especially in coastal or industrial environments common across the GCC region.
- Plain (Black Oxide): Suitable for indoor, low-corrosion environments
- Zinc Plated: Offers moderate corrosion protection for general use
- Hot-Dip Galvanized (HDG): Recommended for outdoor and high-humidity applications
- Stainless Steel (A2/A4): Ideal for marine and chemical exposure environments
Common Applications
DIN 975 threaded rods Grade 8.8 and 10.9 are used extensively across:
- Structural steel framing and support systems
- Anchoring and foundation bolts
- Pipe hanging and support systems (HVAC/MEP)
- Machinery mounting and equipment anchoring
- Scaffolding and formwork systems
Conclusion
Selecting the correct grade, size, and coating for DIN 975 threaded rods is essential to ensure structural integrity and long-term performance. Husaini Brothers stocks a comprehensive inventory of Grade 8.8 and 10.9 threaded rods in various sizes and finishes, ready for immediate supply across Saudi Arabia and the wider GCC region.
