BOLT LOCKING SYSTEMS: LOAD WASHERS
The term load washers refers to a specialty version of a disc spring or Belleville washer used to improve security of bolted connections. They prevent a loss of bolt tension because of thermal cycling, vibrations, setting losses of mating parts, etc. Load washers effectively multiply the elastic reserve inherent in any properly tightened fastener. This makes them very suitable for mostly axially loaded short screws. They are not effective against coming loose due to changing cross loading.
These SCHNORR® load washers have been specially designed for high-strength bolts up to a strength class 8.8 to 10.9 acc. to DIN ISO 898 part 1. This represents the most powerful form of safety washer in the form of a disc spring.
The loads of these washers when pressed flat reach 70 to 90 % of the corresponding bolts of the strength class 8.8.
For the protection of bolted joints only that load is available which remains after the washer has initially set. The table in our brochure indicates the respective minimum height after the initial loading of the washer. Thus the maximum loss of height due to setting is limited.
Particular advantages of the SCHNORR® Load Washer
- High axial load
- Optimum compensation for setting in the joint
- Reduction of the dynamic loading of the screw due to higher elasticity of the joint
- Uniform concentric loading and high safety through a high degree of spring action
- Suitable for captive fitting on a wide range of bolts (Combi-Bolts)