DIN STUD BOLTS & THREADED RODS

DIN 835 | DIN 938 | DIN 939 | DIN 940 | DIN 976 | DIN 2510

Manufacturer & Exporter – Super Industries India

1. Introduction to DIN Stud Bolts & Threaded Rods

DIN Stud Bolts and Threaded Rods are critical fastening components widely used in pressure vessels, flanges, piping systems, valves, pumps, and heavy structural assemblies. Unlike conventional bolts, stud bolts provide uniform clamping force, superior load distribution, and easier installation in confined spaces.

At Super Industries India, we manufacture and export standard and customized DIN stud bolts and threaded rods in carbon steel, alloy steel, stainless steel, and special alloys for global industrial applications.

2. Why Stud Bolts Are Preferred in Critical Applications

Stud bolts are used where:

• Frequent disassembly is required
• High-pressure sealing is critical
• Precise bolt preload is necessary
• Space limitations prevent bolt head use

Key Advantages

✔ Uniform load distribution
✔ Higher fatigue resistance
✔ Suitable for flanged joints
✔ Reduced thread damage

3. DIN 835 – Double End Studs

Definition

DIN 835 specifies double end stud bolts, threaded on both ends with a plain shank in between.

Characteristics

• Equal or unequal thread lengths
• Optimized for nuts on both ends
• Designed for high tensile applications

Typical Uses

• Flange connections
• Valve assemblies
• Heavy machinery

4. DIN 938 / DIN 939 / DIN 940 – Studs with Defined Engagement Lengths

These standards define studs based on thread engagement length into the tapped hole.

DIN Standard	Engagement Length
DIN 938	1 × d
DIN 939	1.25 × d
DIN 940	2.5 × d

Engineering Benefit

Proper engagement length ensures:

• Maximum holding strength
• Reduced thread stripping
• Long service life

5. DIN 976 – Threaded Rods

Definition

DIN 976 covers fully threaded rods, also known as threaded bars.

Key Features

• Threaded along full length
• Cut to required size
• Used with nuts & washers

Applications

• Structural bracing
• HVAC installations
• Electrical supports
• Pipe hangers

6. DIN 2510 – Waisted Shank Stud Bolts (Petrochemical Industry)

Definition

DIN 2510 specifies reduced (waisted) shank stud bolts, commonly used in petrochemical and refinery applications.

Types of DIN 2510

• Type K – Short threads
• Type L – Long threads
• Type Z / ZU – With spacers
• Type NF – Matching nuts

Advantages

✔ Improved stress distribution
✔ Better fatigue performance
✔ Reduced bolt relaxation

7. Comparison: Stud Bolts vs Hex Bolts

Parameter	Stud Bolts	Hex Bolts
Clamping Accuracy	High	Moderate
Reusability	High	Limited
Space Requirement	Low	High
Flange Use	Preferred	Less preferred

8. Material Grades Offered

Carbon Steel

• C45
• ASTM A307

Alloy Steel

• ASTM A193 B7 / B16
• 42CrMo4

Stainless Steel

• AISI 304 / 304L
• AISI 316 / 316L

Special Alloys

• Duplex & Super Duplex
• Inconel
• Monel
• Hastelloy

9. Mechanical Properties

Grade	Tensile Strength
8.8	800 MPa
10.9	1000 MPa
B7	860 MPa
B16	High temperature

10. Manufacturing Process at Super Industries India

1️⃣ Raw material selection
2️⃣ Cutting to length
3️⃣ Thread rolling / cutting
4️⃣ Heat treatment
5️⃣ Surface finishing
6️⃣ Mechanical & dimensional inspection

11. Surface Coating Options

• Black
• Hot Dip Galvanized
• Zinc Plated
• PTFE / Xylan
• Phosphate & Oil

12. Quality Control & Testing

✔ Tensile & yield testing
✔ Hardness testing
✔ Ultrasonic testing (on request)
✔ Thread gauge inspection
✔ MTC as per EN 10204 3.1

13. Export Packaging

• Wooden crates
• Palletized shipments
• Export labeling
• Buyer-specific packaging

14. Industries Served

• Oil & Gas
• Petrochemical
• Power Plants
• Marine
• Heavy Engineering

15. FAQs – DIN Stud Bolts

Q1: Why are stud bolts used in flanges?
They provide uniform clamping and easy disassembly.

Q2: Can you supply DIN 2510 studs?
Yes, Super Industries India specializes in petrochemical fasteners.

Q3: Do you supply long-length threaded rods?
Yes, custom lengths available.

16. Request a Quote

For DIN stud bolts & threaded rods, contact:

📧 sales@superindustriesindia.in