Rolex Spring, A Division of MW Industries Contact Spring Regular Series

Contact Belleville springs combine two important features for improved bolt connections. Their conical shape provides a reactive force and a high elasticity of spring return to compensate for developed looseness, loss of bolt tension due to applied surface deterioration, or movement due to thermal expansion and contraction. The hardened, serrated profile "grips" the lower surface of the bolt or nut to prevent the loss of tension that normally occurs during extreme vibration or severe shock. Contact Belleviles come in sizes that correspont to a wide range of screw head sizes, including hex head socket screws. They can also be used in SEMS assemblies. Made of selected high quality carbon spring steel , these are available with mechanical zinc or tin plate.