DIN 939 Double End Stud Bolt Specifications
Parameter | Details |
Product Name | DIN939 Unequal Thread Length Double End Stud Bolt |
Standard | DIN 939 German Industrial Standard |
Size Range | M8-M42 Full Sizes In Stock, Custom Length Available |
Material & Grade | 4.8/8.8/10.9/12.9 Carbon Steel, A2-70/A4-70 Stainless Steel |
Surface Finish | Black Oxide, Electro-galvanized, Hot-dip Galvanized, Dacromet, Polished |
Structure Feature | Unequal Thread Both Ends, Smooth Middle Shank, Uniform Stress |
Advantage | Repeated Disassembly Without Damaging Base Thread, High Tensile Strength |
Application | Flange Connection, Pressure Vessel, Hydraulic Equipment, Heavy Machinery |
Quality Control | Dimension Tolerance, Hardness, Tensile Strength, Thread Full Inspection |
Package | Export Carton + Pallet, Neutral Packaging Supported |
Supply Capacity | Mass Stock for Standard Sizes, Custom Non-standard Sizes Acceptable |
Product Core Advantages
Unequal Thread Design for Professional Flange Assembly
Designed with standard unequal thread length on both ends and smooth middle shank. The short thread end ensures precise positioning on the equipment base, while the long thread end provides sufficient locking allowance for flange assembly. It ensures high concentricity and uniform clamping force, effectively avoiding loose connection and flange leakage caused by unbalanced stress, maintaining stable sealing performance under high pressure and vibration conditions.
Protects Equipment Base Thread
Stud bolts remain fixed on the equipment base during maintenance. Only nuts need to be disassembled, which completely protects the internal thread of cylinder body and flange base from wear and damage, greatly extending equipment service life and reducing maintenance costs.
High Strength & Fatigue Resistance
High-grade studs adopt professional quenching and tempering heat treatment, with excellent tensile strength and fatigue resistance. It can withstand long-term heavy load, high pressure and alternating vibration without deformation or fracture, meeting strict industrial engineering standards.
Full-scenario Anti-corrosion Solutions
Multiple surface treatments are optional. Black oxide and electro-galvanized for general indoor machinery; hot-dip galvanized and Dacromet for outdoor weather resistance; stainless steel for coastal and chemical corrosive environments, fully covering various working conditions.
Production Process
High-quality Raw Material Selection: High-purity alloy steel and stainless steel with stable mechanical properties.
Precision Cutting: Fixed-length cutting with flat end face and strict tolerance control.
Accurate Thread Rolling: Standard thread profile with 100% gauge qualification.
Heat Treatment Hardening: Improve overall hardness and anti-fatigue performance.
Deburring & Finishing: Smooth end face for smooth assembly.
Custom Anti-corrosion Treatment: Various finishes for different environments.
Strict Multi-level Inspection: Eliminate defective products to ensure project-grade quality.
Application Industries
Chemical Pipeline Engineering: High-pressure flange and pipeline sealing connection.
Pressure Vessel Equipment: Reaction kettle and heat exchange equipment assembly.
Heavy Industrial Machinery: Generator sets, machine tools and base fixing.
Automotive Engine Parts: Cylinder block and high-temperature component connection.
New Energy Wind Power: Wind energy pipe and photovoltaic support fastening.
Overseas Standard Projects: DIN standard fastener supporting for export engineering.
Why Choose Our DIN939 Stud Bolts
We are a professional manufacturer of DIN standard high-strength stud bolts. All DIN939 unequal thread double end studs are strictly produced in accordance with German industrial standards, with complete specifications and sufficient stock. We provide professional fastening solutions for high-pressure, heavy-load and anti-corrosion engineering projects, supporting bulk export orders and customized production with reliable quality inspection reports.
For DIN939 double end stud bolts, non-standard custom threaded studs and complete fastener supporting solutions, please contact us for accurate quotation and technical support.
