Compression limiters
Two new series of compression limiters have been launched by Spirol Industries for moulded-in applications.
The CL500 has radial grooves along the length to provide maximum retention in the plastic; the CL550 provides additional clearance around 6mm and 8mm bolts to accommodate greater positional tolerances.
Compression limiters are used to preserve a threaded joint's integrity when fastening plastic-to-plastic assemblies or plastic-to-metal assemblies, explains Spirol's Andrew Freeman. "As a bolt is tightened to achieve the required friction between threads the plastic is compressed. Without the compression limiter plastic will creep resulting in loosening and eventual failure of the joint.
"The compression limiter absorbs the load generated when the bolt has been tightened to its recommended value. The plastic is isolated from excessive compressive loads and plastic creep is not a factor in ensuring that the joint remains intact throughout the life of the product."
