Carbon steel weld bolt

Carbon steel weld bolt, also known as projection weld bolt or stud weld bolt, is specifically designed for welding applications where components need to be permanently attached to steel surfaces. Its specially designed projection or tip enables resistance welding, creating a strong, reliable joint. Weld bolts are essential in automotive manufacturing, ensuring high-strength welded connections that maintain structural integrity under dynamic and static loads.

ZSD Screw specialize in high-strength carbon steel weld bolts engineered for demanding automotive applications. By integrating in-house material selection, precision cold heading, projection formation, heat treatment, and stringent quality inspection, ZSD Screw delivers weld bolts that guarantee stable mechanical properties, accurate dimensions, and reliable weld performance. These fasteners support high-volume production lines and aftermarket applications, ensuring consistency and durability in automotive assemblies.

Standard weld bolt dimensions are manufactured according to DIN, ISO, and ASTM standards. Custom drawings and samples are accepted to meet specific automotive production requirements.

Type: Weld Bolt (Projection / Stud Weld Bolt)
Diameter Range: M6 – M16
Length Range: 16 mm – 120 mm
Thread Type: Metric / UNC / UNF
Thread Form: Partial Thread / Full Thread (depending on application)
Standard: DIN 928 / ISO 13918 / ASTM A193 (material reference)
Tolerance: According to standard or customer drawing.

We supply weld bolts in a wide range of materials including: Carbon Steel (Q235, 35#, 45#), Alloy Steel (40Cr, SCM435), and Stainless Steel (304, 316) on request.

Strength Grades: Carbon steel weld bolts are available in different strength grades to meet automotive load requirements: 4.8, 8.8, 10.9, 12.9, 14.9. Heat treatment is completed in-house to ensure stable mechanical properties, controlled tensile strength, and reliable performance during welding and service.

Surface Treatment: To improve corrosion resistance and service life, we offer: Zinc plated (blue / white / yellow), Black oxide, Hot dip galvanized, Zinc flake coating, Phosphate, Dacromet. Special surface treatments are available according to customer requirements.

Applications: In automotive and transportation industries, ZSD Screw carbon steel weld bolts are widely used in:

• Chassis structures and vehicle frame assemblies

• Engine and transmission mounting brackets

• Suspension mounts and subframe weld connections

• Body panels and welded subassemblies

• High-volume production lines and aftermarket assembly operations

These applications demand precise welding performance, uniform mechanical properties, and dimensional accuracy. ZSD Screw weld bolts ensure strong, reliable welds, stable load-bearing capacity, and long-term durability under dynamic driving conditions. Controlled production processes and rigorous quality inspection maintain consistency across batches, supporting both OEM and aftermarket automotive manufacturing needs.