5mm x 70mm Double Countersunk Chipboard Screws | Box of 200

Description

The Tekwarm 5mm x 70mm Chipboard & Woodscrew is a double countersunk, wax lubricated single thread screw for fixing 22mm Tekwarm routed chipboard and OSB panels to floor joists. Each box holds 200 screws.

At 70mm long, the screw passes through the 22mm panel and leaves 48mm of thread in the joist. The double countersunk head reduces head shear and sits flush, the 40 degree deep single thread gives high pull-out resistance, and the 25 degree sharp point starts quickly.

5 x 70mm

Screw size

200

Screws per box

Double

Countersunk head

Wax

Lubricated thread

25 / panel

2400 x 600mm chipboard

12 / panel

1200 x 600mm OSB

Fix into the joists, with clearance at the walls

Fix every panel into the joists below, with all edges supported by joists or noggins and a 10mm gap at the walls. Screws go in before the pipe is laid; pre-drill near the channels and countersink so heads sit below the surface.

Fixing numbers and pattern

Tekwarm recommends 25 screws per 2400 x 600mm chipboard panel and 12 screws per 1200 x 600mm OSB panel. Fix at each joist crossing, typically 150mm in from each long edge of the 600mm width, and apply adhesive to the top of the joists as well.

Coverage per box

A box of 200 fixes about 8 chipboard panels (around 11.5 m²) or 16 OSB panels (around 11.5 m²) at the recommended numbers.

Key features

Fixes panels to joists

Secures 22mm routed chipboard and OSB panels directly to timber floor joists.

70mm length

Passes through the 22mm panel for 48mm of embedment into the joist.

Double countersunk head

Reduces the likelihood of head shear and assists countersinking so the panel surface stays flat.

Wax lubricated

Wax lubrication speeds insertion, adds extra driving torque and improves corrosion resistance.

40° deep single thread

Provides a secure fixing with high pull-out resistance in timber.

25° sharp point

Sharp point and single lead give a fast start and improved thread acceptance.

Technical specification

Product details

Brand

Tekwarm

Product

Chipboard & Woodscrew, double countersunk

Size

5mm x 70mm

Quantity

200 per box

Screw features

Head

Double countersunk

Finish

Wax lubricated

Thread

40 degree deep single thread

Point

25 degree sharp point, single lead

Suitable for

Timber and man-made boards; masonry with a plastic plug

Usage with Tekwarm systems

Intended use

Fixing 22mm routed chipboard and OSB panels to floor joists

Chipboard 2400 x 600mm

25 screws per panel

OSB 1200 x 600mm

12 screws per panel

Embedment

48mm into the joist through a 22mm panel

Fixing notes

Pre-drill near channels; adhesive on top of joists; 10mm gap at walls; panel edges supported on joists or noggins

Coverage per box

About 11.5 m² at the recommended numbers

Frequently asked questions

What are these screws used for?

They fix 22mm Tekwarm routed chipboard and OSB panels to floor joists, before the heating pipe is laid.

How many screws does each panel need?

Tekwarm recommends 25 screws per 2400 x 600mm chipboard panel and 12 per 1200 x 600mm OSB panel. A box of 200 covers around 11.5 m² at those numbers.

Where do the screws go?

Fix into the joist at each crossing, typically 150mm in from each long edge of the 600mm panel width. Support all edges on joists or noggins and leave a 10mm gap at the walls.

Should I use adhesive as well?

Yes. Apply adhesive to the top of each joist and to the tongue and groove joints (not near the pipe channels), then fix with screws. Pre-drill near the channels.

Can I use these to fix overlay boards?

No. These 70mm screws are for the panels. Overlay boards need shorter screws that cannot reach the pipe, such as the 20mm or 25mm Tekwarm screws.

What do the wax and the thread do?

Wax lubrication speeds insertion with extra driving torque and corrosion resistance, while the 40 degree deep single thread gives high pull-out resistance.

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