DIN STRUCTURAL FASTENERS

(HV SYSTEM)

DIN 6914 | DIN 6915 | DIN 6916

High-Strength Structural Bolting Assemblies

Manufacturer & Exporter – Super Industries India

1. Introduction to DIN Structural Fasteners

DIN structural fasteners are high-strength bolting systems designed for steel-to-steel load-bearing connections. These fasteners are engineered to withstand extreme tensile loads, shear forces, and dynamic stresses, making them essential for infrastructure and heavy engineering projects.

At Super Industries India, we manufacture complete HV (High-Strength) bolt assemblies strictly as per DIN standards for global structural applications.

2. What Is an HV Bolt Assembly?

An HV system consists of three matched components:

1️⃣ Bolt – DIN 6914
2️⃣ Nut – DIN 6915
3️⃣ Washer – DIN 6916

⚠️ These components must always be used as a complete set to achieve certified structural performance.

3. DIN 6914 – High-Strength Structural Bolts

Standard Description

DIN 6914 specifies hexagon head bolts for structural steel connections.

Key Features

• Large width across flats
• Controlled shank length
• High tensile strength

Strength Classes

• 8.8
• 10.9

Typical Sizes

• M12 to M36

Applications

• Bridges
• Steel frames
• Towers
• Industrial structures

4. DIN 6915 – High-Strength Structural Nuts

Standard Description

DIN 6915 specifies hexagon nuts with large width across flats.

Key Features

✔ Designed for high preload
✔ Matches DIN 6914 bolts
✔ High resistance to stripping

Strength Class

• Class 10

5. DIN 6916 – Hardened Structural Washers

Standard Description

DIN 6916 covers hardened washers used with HV bolts.

Engineering Role

• Prevents embedment
• Maintains preload
• Protects steel surfaces

6. Mechanical Properties of HV Assemblies

Component	Standard	Property Class
Bolt	DIN 6914	8.8 / 10.9
Nut	DIN 6915	Class 10
Washer	DIN 6916	Hardened

7. Preload & Tightening Methods

Tightening Techniques

• Torque-controlled tightening
• Combined torque + angle method
• Calibrated wrench tightening

Proper tightening is mandatory to ensure joint integrity.

8. Material Grades Used

• Carbon steel
• Alloy steel

Heat treated to meet structural requirements.

9. Surface Coatings

• Plain black
• Hot dip galvanized (HDG)
• Zinc flake coating
• Phosphate coating

HDG thickness conforms to DIN requirements.

10. Dimensional Accuracy & Tolerances

All HV fasteners are manufactured with:

• Controlled shank diameter
• Tight thread tolerances
• Matching washer hardness

11. Manufacturing Process

1️⃣ Forging
2️⃣ Thread rolling
3️⃣ Heat treatment
4️⃣ Surface coating
5️⃣ Assembly inspection

12. Quality Assurance

✔ Tensile testing
✔ Hardness testing
✔ Preload verification
✔ Dimensional inspection
✔ EN 10204 3.1 certification

13. Export Compliance

• CE-ready fasteners
• Traceable heat numbers
• Batch-wise documentation

14. Typical Industries Served

• Infrastructure & bridges
• Power plants
• Steel fabrication companies
• EPC contractors

15. Why Choose Super Industries India for HV Fasteners?

✔ Complete DIN HV assemblies
✔ Consistent preload performance
✔ Export-grade certification
✔ Custom packing & marking
✔ Global shipping

16. DIN Structural Fastener Comparison

Standard	Component
DIN 6914	Bolt
DIN 6915	Nut
DIN 6916	Washer

17. FAQs – Structural Fasteners

Q1: Can HV bolts be supplied individually?
No, HV bolts should be supplied as matched assemblies.

Q2: Are HDG HV bolts available?
Yes, with controlled thread allowance.

Q3: Do you supply test certificates?
Yes, EN 10204 3.1 provided.

18. Request a Quote

📧 sales@superindustriesindia.in