RReliable Spring Force
The curved design generates continuous axial pressure after installation, helping maintain bolt preload and reducing the risk of loosening caused by settling or minor vibration.
DIN 128A Curved Spring Lock Washer
- Standard:DIN 128A (Type A)
- Material: Stainless Steel
- Size: M3–M36 (custom sizes available)
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 128 A is a Type A curved spring washer (Federring) used under bolt heads or nuts to maintain clamping force and improve fastening reliability. The washer creates an axial spring force after compression, helping compensate for minor relaxation and vibration during service.
Compared with ordinary flat washers, DIN 128 A provides additional elastic compensation, making it suitable for applications where maintaining preload is important.
Draw
Specification
DIN 128 A vs DIN 127 B Spring Washer
DIN 128 A
- Curved spring washer design
- Better suited for bolt/nut assemblies
- Provides controlled spring force
DIN 127 B
- Split spring washer design
- Traditional locking washer type
- Less commonly specified in modern applications
DIN 128 Type B has been removed from the standard, while Type A remains the commonly used design because of its better suitability for bolt/nut assemblies.
Product Advantages
High Elastic Recovery
Manufactured from spring steel, DIN 128 A washers provide excellent resilience and repeated compression performance, ensuring stable fastening performance during operation.
Wide Industrial Compatibility
DIN 128 A is commonly used with metric bolts, screws, and nuts in mechanical equipment, automotive assemblies, electrical devices, and industrial machinery.
Common Questions
What is DIN 128 A spring washer used for?
DIN 128 A is used to provide elastic preload in bolt and nut assemblies, helping reduce loosening caused by settling and maintaining fastening stability.
What material is DIN 128 A spring washer made from?
Standard DIN 128 A washers are generally manufactured from spring steel (FSt). Stainless steel versions such as SUS304 and SUS316 are also available for corrosion-resistant applications.
What surface treatments are available?
Common finishes include zinc plating, black oxide, phosphate, Dacromet, Geomet, and plain spring steel finish.
Can you provide OEM manufacturing?
Yes. We offer customized dimensions, hardness requirements, coatings, laser marking, packaging, and private-label solutions.
