Schnorr 9.8 x 6.2 x 0.2mm Preload Disc K-Spring Washer, Plain 100pk

Schnorr is a German manufacturer of precision disc springs, safety washers, and load washers engineered for bolt-securing and load-sensing applications in industrial machinery, equipment assembly, and structural fastening. Schnorr safety washers use a patented radial serration system that locks under vibration to prevent bolt loosening without adhesives or thread inserts, making them a preferred solution in high-vibration environments.

Schnorr safety washers use opposing pairs of washers with mating radial serrations — one set on each washer face. Under tightening, the serrations embed into the contact surfaces and create a wedge-lock effect that resists rotational loosening under vibration. They are used as a direct replacement for spring washers and thread-locking compounds in applications where reliable bolt retention is critical and disassembly without damage is required.

Where this product is used

Schnorr safety washers are used wherever vibration causes bolt loosening:

• Industrial machinery and rotating equipment where vibration from motors, drives, and gearboxes causes progressive bolt loosening.
• Structural and civil engineering fastening where bolt preload retention over the service life of the joint is specified.
• Automotive and transport assembly where reliable anti-loosening without chemical threadlockers is required.

Selecting the right option

Schnorr safety washers are supplied in pairs and sized by bolt diameter — select the washer size to match the fastener M-size. Stainless steel variants are required for outdoor, marine, and corrosive environments; standard carbon steel suits most indoor industrial applications. The washer thickness determines the preload capacity — refer to Schnorr load data tables for applications where specific clamping force retention is required.