- zsdscrew.com
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【2】Size: M5-M16.
【3】Surface treatment: Galvanized/nickel/chromium, Blackened, Hot-dip galvanized, Dacromet.
【4】Packaging methods: Bagged, Boxed, Cardboard box, Pallet.
【5】Execution standards: GB, DIN, ISO, ANSI, JIS, etc.
【6】Optional services: Customize、OEM/ODM、Testing (salt spray testing,etc)
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.
Custom Fasteners Manufacturer: ZSD Screw specializes in manufacturing custom non-standard fasteners according to customer drawings and samples.We support: Special dimensions and tight tolerances. Special thread forms. High strength and special materials. Small batch and mass production. Our experienced engineers provide professional technical support from design to production.
Quality Control & Certifications: Quality is strictly controlled throughout the entire production process.Inspection includes: Raw material inspection. Dimensional measurement. Thread gauge inspection. Salt spray test. Torque test. Hardness testing. Tensile strength testing Certifications: ISO 9001. IATF 16949. EN standards. ASTM standards.
Why Choose ZSD Screw: More than 16 years manufacturing experience. Complete production process (cold heading, CNC machining, heat treatment) . Strong custom fastener capability. Stable quality and competitive factory price. The delivery time of the source factory is short and controllable. Professional technical services and long-term after-sales service.
Please send us your drawings or specifications. Our engineers will provide professional fastening solutions and quotations within 24 hours.
A: We are a certified source factory located in SuZhou, China, with 16+years of expertise. Unlike trading companies, we operate our own cold-heading and thread-rolling lines, offering you factory-direct pricing, total quality control, and transparent production timelines.
A: It represents the highest quality standard in the automotive industry. For you, this means Automotive-Grade precision, 100% batch traceability, and a "Zero Defect" management philosophy applied to every fastener we produce, regardless of your industry.
A: Absolutely. Customization is our core strength. Our engineering team works with CAD, SolidWorks, and 3D Step files. From specialized head types to complex multi-station parts, we provide a one-stop solution from rapid prototyping to mass production.
A: Beyond our IATF protocols, we utilize high-speed automated optical sorting machines. These systems inspect 100% of the batch for dimensional accuracy, thread integrity, and surface defects, ensuring we meet your strict PPM (Parts Per Million) requirements.
A: Yes. As an IATF-certified partner, we provide full PPAP Level 3 packages, including Control Plans, PFMEA, and ISIR. Every shipment is accompanied by a 3.1 or 3.2 Material Test Report to verify chemical and mechanical compliance.
A: For standard stock items, there is no MOQ—you can order by the box. For custom parts, the MOQ depends on the specifications. We offer free samples for quality evaluation (customer covers shipping), which can be fully refunded upon mass production orders.
A: Stock items are shipped within 24-72 hours. Standard production typically takes 20-30 days, while complex custom projects (including tooling) take 35-45 days. We provide a firm delivery commitment with every quotation.
A: Yes. We offer DDP services globally (USA, Europe, Southeast Asia, etc.). We handle all freight, customs clearance, and import duties, delivering the goods directly to your door so you can focus on your business without logistics headaches.