Rawl plug rage

时间:2019-03-06 04:20:10166网络整理admin

By Barry Fox Screws won’t bite into brickwork unless the hole is lined with a plug, and the plug’s added pressure may split the brick in any case. But PA Fixings of Essex has patented a screw that does away with the need for a plug—though it’s not at all clear why it works (GB 2 344 629). The shank has several threaded sections spaced out at intervals along it. Each section has three turns of a thread. The two outer turns are the same size,