The 1550WMS50T is a 50-pack of metric, tamper-resistant lid screws for Hammond 1590 Series diecast aluminum enclosures. These are the water-tight version, described by Hammond as SS screws with o-rings, and they use a Torx with Pin drive to discourage casual tampering with an installed enclosure.

In the 1590 Series hardware table, this pack is listed as the Torx with Pin tamper-resistant upgrade for the water-tight versions of three enclosure sizes: 1590CE, 1590DE and 1590EE. Hammond lists screwdriver bit SCDRIVET15-2 alongside it for installation and removal.

The 1590 Series notes remind buyers to order watertight screws (stainless steel with o-ring) when converting a standard enclosure to a watertight box, and the series gasket kits are designed to meet IP65 with a properly installed gasket and lid screws torqued to 25-30 cN.m (36-43 ozf.in). This pack pairs the o-ring feature with a tamper-resistant head.

If you need a different finish or drive for the same sizes, the table also lists 1550MS50T and 1550MS50TBK (Torx with pin, natural and black), 1550WMS50TBK (water-tight black), and Philips head packs 1550MS100, 1550MS100BK, 1550WMS100 and 1550WMS100BK. The material is listed as steel; the pack ships in a bag with a shipping weight of 0.12 lbs (0.05 kg) and is RoHS and REACH compliant.