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The original SCHNORR® safety washers were developed as a reliable and economic bolt locking device with the basic principle of a disc spring. This ingenious form combines the advantage of security through friction and mechanical locking.
Original SCHNORR® safety washers are now used world wide where secure fastening connections to counter the effect of vibration are required.
SCHNORR® safety washers are in the form of a disc spring but with a trapezoidal cross-section and serrations on both sides. The outer diameter is matched to the head diameter of the pan head and socket head cap screws.
SCHNORR® safety washers are available in two versions: the standard safety washer type “S” is available for screws of sizes M1.6 to M36 and of the property classes up to 8.8. For screws of property classes 8.8 and 10.9, higher pretension forces might be necessary. These are covered by our reinforced washers type “VS”.
Due to the conical form, optimal traction is achieved at highest positive locking due to the helical gearing.
Functionality and the correct use
of the original SCHNORR safety washers are briefly explained within the following video