The DIN 939 standard defines double-ended threaded studs manufactured with one end having short threads and the other end having long threads. These studs are typically used in mechanical assemblies where one end is fixed and the other end requires connection with a nut. The long-threaded end provides advantages in terms of adjustment distance and resistance to loosening.
DIN 939 screws provide high-strength connections and are frequently preferred in machinery, automotive, pump, valve, pressure vessel, and flanged pipe systems. Thread lengths are manufactured according to ratios specified in the standard, and production in custom lengths is also possible upon user request.
| Feature | |
| Standard | DIN 939 |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
| Quality | 4.6, 5.6, 8.8, 10.9, 12.9, A2, A4 |
| Type | Double-Ended Screwdriver |
| Coating | Electrogalvanized (White/Yellow), Hot-Dip Galvanized (HDG), Nickel, Black Oxide, Dacromet, Geomet |
| Tooth Type | Metric Coarse Thread, Metric Fine Thread – UNC / UNF (Inch) |
| Measurement Range | From M10 to M80, 1/2″-3″ |
| Production Method | Grinding or machining |
| Thread Direction | Right-Hand Thread (standard) / Left-Hand Thread (upon request) |
- Pump and valve installations
- Flange pipe connections
- Pressure vessels and boilers
- Automotive and heavy industry applications
- Industrial machine connections
- Energy, petrochemical, and maritime industries
- ISO 9001:2015 Quality Management System
- ISO 14001:2015 Environmental Management System
- ISO 45001:2018 Occupational Health and Safety Management System
- EU Declaration of Conformity (PED) certificate (Compliance with the Pressure Equipment Directive)
- Our production processes, DIN, EN, ISO, and ASTM is fully compliant with the standards
- Upon request EN 10204 3.1 certificate is provided
Yes. It is usually produced by grinding (tooth extraction). This method both increases strength and improves surface quality.
Yes. DIN 939 fasteners are suitable for repeated removal and installation thanks to their short end that screws into the fixed part. This feature facilitates maintenance and installation.
Options include carbon steel, alloy steel, and stainless steel (A2, A4, 321, 347, etc.). Quality and material are selected according to the application area.
Türkçe 
English 
Русский 
Deutsch 
العربية