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

RS PRO SEMS Screw
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.

278-821 is an M3 x 6mm SEMS screw

Screw with pozidriv head

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

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

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.