Anti-Rotation Design
Four-sided structure prevents unwanted turning and improves fastening stability.
DIN 557 Square Nut
- Standard: DIN 557
- Material: Stainless Steel
- Thread Size: M4-M16
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 557 is a German standard specifying metric square nuts (Vierkantmuttern), Product Grade C. With its four-sided external shape, DIN 557 square nuts provide strong resistance against rotation and excellent torque transmission compared with conventional hex nuts. They are widely used in machinery, steel structures, furniture, electrical equipment, and industrial assemblies requiring reliable fastening.
Manufactured from carbon steel, stainless steel SUS304/A2, SUS316/A4, and available with various surface treatments, DIN 557 nuts offer flexible solutions for different environments and application requirements.
Draw
Specification
IN 557 vs DIN 934 Hex Nut — Key Differences
DIN 557 Square Nut
- Square body design provides better anti-rotation performance and a larger bearing surface.
- Higher resistance to turning when installed in slots, channels, or confined spaces.
- Suitable for fixed-position applications such as machinery, furniture, electrical equipment, and special assemblies.
DIN 934 Hex Nut
- Standard six-sided design for general fastening applications.
- Easier installation and removal with common wrenches and automated tools.
- Widely used and highly interchangeable across industrial fastening systems.
Core Difference:
DIN 557 focuses on position stability and anti-rotation, while DIN 934 focuses on universal compatibility and easy installation.
Product Advantages
High Torque Performance
Large contact area ensures reliable tightening and load transmission.
Industrial Durability
Available in carbon steel and stainless steel for demanding applications.
Common Questions
What is DIN 557 square nut?
DIN 557 is a German standard for metric square nuts with a four-sided external shape. It is mainly used where higher resistance against rotation is required compared with conventional hex nuts.
What is the difference between DIN 557 and DIN 934 nuts?
DIN 557 uses a square body design for better anti-rotation performance, while DIN 934 is a standard hex nut designed for general fastening applications.
What sizes are available for DIN 557 square nuts?
Common sizes include M5, M6, M8, M10, M12, and M16. Larger sizes can also be customized according to customer requirements.
Are DIN 557 nuts compatible with standard metric bolts?
Yes. DIN 557 uses ISO metric threads and can be matched with standard metric bolts and screws of the same thread size.
