PAS Precision Adjustable Spanner

Most bearing retaining nuts are round to provide better balance to a bearing or other rotating power transmission assembly, in contrast to most fixed fastener nuts being hexagon shaped. In order to assist in rotating these spanner nuts and at the same time provide a means to lock the nut in place with a bearing lock washer slots are put in the circumference, usually 4, but at times 2, 3, 6, or 8. These wrenches useable for more than one size of nut are called adjustable. They fit around part of the circumference to allow rotation. They do not work in housings, however the BAS sockets of our manufacture do.