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

View all Sems Screws
Bulk discount available

Subtotal (1 bag of 100 units)*

£8.38

(exc. VAT)

£10.06

(inc. VAT)

Add to Basket
Select or type quantity
In Stock
  • 315 unit(s) ready to ship
  • Plus 62 unit(s) ready to ship from another location
  • Plus 195 unit(s) shipping from 10 December 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Bag(s)
Per Bag
Per unit*
1 - 4£8.38£0.084
5 - 9£7.96£0.08
10 - 29£7.54£0.075
30 +£7.05£0.071

*price indicative

RS Stock No.:
278-691
Brand:
RS PRO
Find similar products by selecting one or more attributes.
Select all

Brand

RS PRO

Length

12mm

Thread Size

M4

Head Shape

Pan

Drive Type

Pozidriv

Washer Type

External Tooth

Material

Steel

Standards Met

BS 4183/DIN 6797A

Finish

Bright Zinc Plated

COO (Country of Origin):
TW

RS PRO Stainless-Steel Sems Screw


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.

Features and Benefits


  • External shake-proof washer Pan headed pozidriv screw

  • Bright zinc plated stainless-steel construction to protect against corrosion

  • Low-cost Fastener, allowing you more accessible and quicker to install than separate screws and washers

  • SEMS enabling you to reduce the number of components needing to complete your small or big project

  • Our range of 6, 10, 12 and 16 mm Sems Screw letting you lower inventory count

Applications


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

Why RS PRO?


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.

Note

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

Related links