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

  • RS-artikelnummer 278-871
  • Tillverkare / varumärke RS PRO
Lagstiftning och ursprungsland
COO (Country of Origin): CN

RS PRO SEMS Screw with Plain Washer

From the trusted RS PRO brand, these pan head SEMS screws are ideal for when a good speed of assembly is required. SEMS screws have advantages over similar threaded screws in that a loose washer is pre-fitted to the fastener, saving you time in selecting and fitting a separate washer. As such, whenever a quick installation is required, these SEMS screws are ideal.

The screws feature a bright zinc finish which provides an element of corrosion resistance which makes them ideal for use in most indoor environments. They also feature a pozidriv head for maximum torque in installation.

Available in the following sizes;

278-821 is an M3 x 6mm SEMS screw 278-837 is an M3 x 12mm SEMS screw
278-865 is an M4 x 6mm SEMS screw
278-871 is an M4 x 12mm SEMS screw
278-916 is an M5 x 10mm SEMS screw
278-922 is an M5 x 16mm SEMS screw
278-950 is an M6 x 12mm SEMS screw
278-966 is an M6 x 16mm SEMS screw
278-972 is an M6 x 20mm SEMS screw

Features and Benefits

Screw with pozidriv head Plain washer
Easier and quicker to install than separate screws and washers
Bright Zinc Finish


Used wherever conventional screw fasteners are needed, SEMS screws are ideal for optimized work environments due to being a pre-assembled washer and screw combination. They are designed with convenience in mind, saving you time and effort in installation. They might commonly be used in;

• Production environments
• Maintenance
• DIY Applications

What does SEM mean?

In this case, SEM is simply a shorthand way of saying 'pre-assembled.'

What is the advantage of a Pozidriv screw?

A Pozidriv screw is an improvement on the crosshead screw, or Phillips screw. Like the crosshead, the Pozidriv screw naturally centers the torque when a Pozidrive screwdriver is applied, meaning there is less resistance and more control when screwing and unscrewing. To lessen the chance of the driver slipping from the screw head, known as cam out, the Pozidriv screw is preferable even to the Phillips screw.


RS PRO aims to be your go-to brand for reliability and value for money. We source great parts at great prices and test everything with our in-house experts to ensure the quality you need.

When it comes to tools, we know that versatility and dependability are what you need. As such, we stock a variety of mainstay and specialist tools to suit any application. Whether you're a professional electrician, plumber, builder or DIY enthusiast, RS PRO is here to support you.

Attribute Value
Length 12mm
Thread Size M4
Head Shape Pan
Drive Type Pozidriv
Washer Type Plain
Material Steel
Finish Bright Zinc Plated
277 I lager för leverans inom 1 arbetsdagar
Pris (ex. moms) 1 Bag of 100
89,23 kr
(exkl. moms)
111,54 kr
(inkl. moms)
Per Bag
Per unit*
1 - 4
89,23 kr
0,892 kr
5 - 9
84,77 kr
0,848 kr
10 - 29
80,30 kr
0,803 kr
30 +
74,95 kr
0,75 kr
Related Products
Machine screws are fully threaded screws that are ...
Machine screws are fully threaded screws that are specifically designed to be used in pre-tapped holes or used with conforming nuts and washers in through holes. Machine screws are available in an array of configurations, materials, driver head types and ...
From RS PRO a high-quality pan head machine ...
From RS PRO a high-quality pan head machine screw with a versatile Pozidriv recess for a superior grip when tightening. This machine screw is made from high-quality steel with a black zinc passivated finish which helps prevent corrosion as well ...
Thread forming screws for metal having a tri-lobular ...
Thread forming screws for metal having a tri-lobular cross-section capable of forming or rolling a metric thread into the material into which they are installed. Ideal for use with pre-drilled or punched holes in a wide range of ductile metalsCase ...
Zinc plated and passivated hardened steel Self-drilling screws ...
Zinc plated and passivated hardened steel Self-drilling screws offer all the advantages associated with standard self-tapping screws but are capable of drilling their own pilot holes into sheet metal up to 5mm in thickness.,Self-drilling screws should always be installed using ...