A SEMS screw is a screw with a washer already fitted and held captive on the shank. You handle one part instead of two.

ASL supplies a vast range of SEMS, from single washer to double assemblies in many combinations.

They are increasingly popular on production lines because they save time and stop washers going missing.

Advance Spares Limited, Unit 21, Vauxhall Industrial Estate, Ruabon, Wrexham LL14 6HA. Tel 01978 823 900. Email sales@aslgroup.uk.com.