DIN938 Stud Bolt

 1. Professional Manufacturing Experience

With decades of concentrated production experience on DIN standard stud bolts and high-strength industrial fasteners, our factory owns dedicated cold forging, thread rolling and heat-treatment automatic production lines for DIN938 studs. All production flow is formulated referring to DIN938, ISO 4032 and ASTM A193 standards.

Our mature processing technology ensures uniform thread tooth profile, consistent pitch size and stable mechanical performance across each production batch. Over years, DIN938 double end studs from our workshop have been exported to Europe, Southeast Asia, Middle East and North America, matched with DIN934 hex nuts, DIN985 nylon lock nuts and DIN125 flat washers for complete fastening sets, gaining stable long-term cooperation with petrochemical manufacturers, equipment assemblers and engineering contractors globally.

We support customized thread length, blank diameter and surface finish according to clients’ drawing requirements, solving personalized connection demands of non-standard equipment and special working condition projects.

 2. Strict Full-Range Quality Control System

 2.1 Raw Material Incoming Inspection

All raw steel bars are inspected upon warehouse entry, checking chemical composition and mechanical property against EN 10263 & ASTM A240 specification; only qualified raw materials are permitted into production. Carbon steel blanks adopt SCM435/45# steel, stainless steel selects SUS304/SUS316 certified steel from regular steel mills with complete MTR material test reports.

 2.2 In-process Production Monitoring

During cold heading forming and thread rolling, QC staff spot-check dimension tolerance every 30 minutes, controlling thread pitch, outer diameter and shank straightness within DIN permitted tolerance range. High-strength carbon steel studs go through precise quenching & tempering heat treatment to reach required grade hardness.

 2.3 Finished Product Comprehensive Testing

Before delivery, finished DIN938 studs undergo multi-item laboratory testing as per ISO 898-1 standard: tensile test, yield strength test, hardness inspection, torque test and salt spray corrosion test. Zinc-plated carbon steel items reach minimum 72h neutral salt spray; passivated 304/316 stainless steel studs exceed 500h salt spray without rust spot. Defective goods are automatically sorted out to guarantee 100% qualified outgoing products.

 3. Standard Compliance & Complete Authoritative Certifications

Our factory has obtained ISO9001 quality management certification, all DIN938 double end studs comply strictly with DIN938 official dimensional standard, ISO 898 mechanical property standard, and meet EU CE, RoHS environmental limits for harmful substances.

We can provide full sets of certification documents for buyers’ factory audit and project customs clearance: raw material MTR reports, factory inspection certificate, salt spray test report, mechanical test sheet and commercial export documents, fully satisfying procurement standard of international large-scale engineering and OEM equipment manufacturers.

 4. Diversified Material & Grade Matching for Multiple Working Conditions

 5. Working Condition Selection Guidance & Application Cases

 5.1 Carbon Steel DIN938 Stud Selection Scenarios

4.8/8.8 grade zinc-plated carbon steel studs are preferred for indoor ordinary machinery, general pipeline flange and inland construction equipment under normal atmospheric environment with low corrosion risk; 10.9 grade hot-dip galvanized studs apply for outdoor inland iron structure and open-air power facilities to improve rust resistance. Hot-dip galvanizing improves salt spray performance drastically for long-term outdoor exposure projects.

 5.2 Stainless Steel 304 &316 DIN938 Stud Application

304(A2-70) stainless steel studs suit indoor food machinery, freshwater pipeline and inland dry outdoor equipment; 316(A4-80) molybdenum-containing stainless steel studs are mandatory for coastal salt-spray areas, offshore equipment, petrochemical acidic medium pipeline and marine vessel flange connection, effectively resisting chloride ion corrosion and prolong equipment service life greatly.

 5.3 Practical Project Case

We have supplied bulk DIN938 stud sets for multiple Middle East petrochemical pipeline projects and Southeast Asia coastal power station construction, matching complete nuts & washers. Clients feed back zero corrosion and loose failure after 5 years of field operation, verifying reliable product performance under complex harsh environment.

 6. Factory Stable Supply & Standard Export Packaging

As physical manufacturer with independent production workshop and large finished goods warehouse, we maintain regular safety stock for mainstream DIN938 sizes to realize fast delivery within 7~15 working days for bulk orders. For urgent customized orders, our production line arranges priority production to shorten lead time.

Products adopt inner plastic bag + outer export carton, fixed on fumigation-free wooden pallet for sea transportation, moisture-proof and rust-proof to avoid damage during long-distance global shipping. Our professional foreign trade team offers real-time order tracking, technical parameter consultation and after-sales problem resolution, striving to become reliable long-term stud bolt supplier for global importers and engineering companies.

 7. FAQ Buyer Common Questions

Q1: What is the difference between DIN938 and DIN939 stud bolt?

DIN938 has threaded section on both ends and smooth middle rod; DIN939 is full thread entire stud body, customers choose based on flange thickness and assembly structure.

Q2: Can DIN938 studs work under high-temperature high-pressure vessel?

8.8/10.9 high strength carbon steel and A4-80 316 stainless steel DIN938 studs are qualified for high-pressure vessel connection complying with pressure equipment industry standards.

Q3: Is custom thread pitch and non-standard length available?

Yes, we support non-standard drawing customization for special dimension DIN938 stud bolts.