Metallics JLWX1 Washers 4 Ext Tooth Lock St-zn (Jar 100)

The JLWX1 is a #4 external tooth lock washer, so it pairs with #4 machine screws and sheet metal screws, the size commonly used on device mounting and small panel screws. Ordering it for a #6 or #8 screw will leave the washer loose on the shank.

An external tooth washer, like the JLWX1, puts its teeth around the outside diameter, so the bite happens out at the edge of the washer rather than under the screw head. That gives more anti-rotation grip on sheet metal, device yokes, and panel surfaces where the bearing area is wide. Internal tooth washers hide the teeth under the head for a cleaner look, and a split ring washer gives spring tension rather than tooth bite. For electrical device and enclosure screws, the external tooth style is the usual pick.

They are zinc plated steel, which handles normal indoor and protected locations like panels, boxes, and raceway hardware. Zinc plating is not a marine or continuously wet duty finish, so for washdown or exterior exposure go to stainless.

Each jar holds 100 of the #4 external tooth lock washers. The jar pack is meant for a van or shop bench, so a single buy covers a lot of device and enclosure screws without loose bagged hardware spilling in a bin.

The JLWX1 is listed for electrical, plumbing, heating and air conditioning work, so the same jar serves mechanical hangers, strut hardware, and equipment panel screws as well as device and box screws. The limit is screw size, not trade: it is a #4 washer.

Order Metallics JLWX1. That single part number covers the #4 external tooth zinc plated steel lock washer in the 100 count jar; there are no finish or size options to specify on it.

The jar measures 3 x 3 x 2.15 inches and weighs 0.03 lbs as listed, so it drops into a small parts drawer or a van bin shelf without taking a full slot.