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Machine Design

Screws interlock with plastic

BosScrew fasteners reportedly prevent plastic assemblies from loosening as a result of plastic creep that dissipates clamp load.

The product is said to provide as much as four times the holding power and drive-to-strip ratio 66% better than other screws used in plastics. They feature a series of "pressure wells" or indentations along the upper face of the thread circumference. Once assembled, plastic creeps into the indentations, creating resistance bumps with valleys in-between. To loosen, the crests in the screw thread between the indentations must climb over each bump. The resistance to loosening is as much as 450% greater than that offered by other fasteners used in plastics. The BosScrew has a traditional 48° form and standard head. It provides a virtually vibrationproof joint, eliminates the need for flat washers and reinforcing inserts, and can be removed and reused.

ITW Shakeproof Industrial Products
2550 S. 27th Ave.
Broadview, IL 60155
(708) 551-2966

TAGS: Fasteners
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