RS PRO M4 x 12mm Zinc Plated Steel Pan Head Sems Screw, External Tooth Washer

Pre-assembled Screws have revolutionised the assembly in many parts of our lives, from Drone sub-assemblies, control systems to aerospace avionics sector.

We are proudly introducing our own branded RS PRO Stainless-Steel Sems Screw with bright zinc plating, which is particularly essential for corrosion resistance.
The low-cost Fastener consists of a pan head pozidriv screw with integral captive washer for quick and easy installation.

SEMS Screw is a fast, permanent and in combination with a nut plate, you can significantly reduce the number of components needed, especially in an electrical connector assembly, meaning more time for your project.

A significant advantage of using our Sems Screws lies in reduced inventory count and allowing you to increase your production through the easy assembly.
As SEMS Machine Screws does not require thinking about missing washers, you are extending product life and speed up the performance of the whole part.

Not surprisingly, thanks to high-quality and friendly installation SEMS Screws have their place in:

• Avionic communication systems


• Flight control systems


• Infra-red systems and cameras


• Naval & ground fire control systems


• Battery packs


• PCB (Printed Circuit Board) assembly


• Drone sub-assemblies


• Connector assembly

RS PRO is our family brand to go-to and brings you a wide range for high-quality and high-value products to support your project. Trusted by engineers all over the world, every part of every RS PRO product is always rigorously tested against demanding industry standards. We are only giving the RS PRO seal of approval if we are confident of their exceptional quality, which means you can be convinced too.

All these are coarse metric thread. The fine thread pitch would typically start at M8 diameter.

Thread pitch as follows.

M3 x 0.5mm pitch
M4 x 0.7mm pitch
M5 x 0.8mm pitch
M6 x 1.0mm pitch