4 x 20mm Countersunk Wood Screws, Pozi, Zinc & Yellow, Box of 200 (40020CLAF)

20mm Wood Screws

20mm Timco countersunk wood screws in boxes of 200 with a deep single thread that provides a secure fixing and high-pull-out resistance every time.

With a double countersunk Pozi head and covered with a patented lubrication designed to enhance screw insertion time and providing resistance to corrosion.

Surfaced hardened to prevent torque shearing and a core hardness of up to 450 HV for improved ductility. The sharp point also ensures a fast start and improve thread acceptance and sees these screws used in hardwood, softwood, chipboard, MDF, plastic, and thin sheet metal.

A versatile multi-purpose wood screw from Timco that’s used across many industries by both professional and DIY enthusiasts alike.

20mm wood screw specification:

• Size: 4 x 20mm
• Drive: Pozi
• Head type: Double countersunk
• Material: Carbon steel
• Finish: Zinc & Yellow
• Deep single thread to provide a secure fixing with high pull-out resistance
• Double countersunk head reduces the likelihood of head shear
• Surface hardened up to 750 HV to prevent torque shearing

These wood screws are part of a larger range of Timco wood screws with bulk buy options available at Fusion Fixings.

FAQs about Timco Classic Multi-Purpose Woodscrews

What does “double countersunk” mean?

The ‘double countersunk’ means and enhanced countersunk head design that also include ribs. It reduces the risk of head shear and ensures the screw sits flush to the materials surface for a neat finish every time.

Do I need a pilot hole with these screws?

In most cases not, the 25° sharp point and thread design means the screws drive straight into most materials, though hardwoods may benefit from pre-drilling.

What materials can they be used in?

Like many Timco woodscrews, they’re suitable for hardwood, softwood, MDF, chipboard, plastics, and thin sheet metal.

Are ‘zinc and yellow’ screws corrosion resistant?

These woodscrews have a corrosion rating of 2 which sees them best used for general indoor and sheltered outdoor use. For general outdoor use, stainless steel screws are advised.

What is patented lubrication and why does it matter?

Timco’s patented lubrication reduces driving torque, making installation easier and extending corrosion resistance.

What does “40° deep single thread” mean, and how does it affect holding power?

The 40° deep single coarse thread gives high pull-out resistance, meaning once screwed in, they resist being pulled out; this helps in applications where holding strength is important

How is thread coverage handled for different lengths?

For lengths up to and including 75mm, the screws are fully threaded. For longer screws of 80mm and above, the thread length is 70mm. 

Read Less