Is a chipboard screw the same as a wood screw?

In practice yes; a chipboard screw is fully threaded with a coarse thread and has replaced the classic wood screw in most joinery work. In hardwood you still drill a pilot hole to avoid splitting.

What does 4.5x45 mean?

A 4.5 mm shank diameter and a 45 mm length. The first figure sets the holding power, the second the depth into the base material.

How thick a section will a self-drilling screw go through?

It depends on the drill point length; the TEK sizes in this catalogue typically work in 1-3 mm sheet with no pilot hole. Thicker sections need a pilot.

Where do the sharp and drill-point drywall screws go?

The sharp point goes into timber studs and the drill point into steel studs. A sharp-point screw will lose its tip trying to enter a steel profile.

Why does a roofing screw have a washer?

On a metal roof, water enters through the hole the screw makes. The EPDM-bonded washer under the head seals that hole as it is tightened; without a sound washer the screw itself seals nothing.

How many are in a box?

It follows the size: thin, short sizes come in 500-1,000 piece boxes, thick and long ones in 50-200. The quantity is stated in the product name.

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Screws

Screws are the largest group in this tree, and the choice comes down to three things: the material they enter, whether the point needs a pilot hole, and whether the coating survives the environment. This page covers chipboard, drywall, self-drilling and roofing screws, how to read the diameter-length code, and how to pick a coating. The catalogue holds over 180 sizes from Akdeniz and Meridyen.

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Screw types and the materials they enter

What names a screw is its thread and its point. A chipboard screw has a coarse, deep thread that bites into wood fibre; a drywall screw has a fine thread and a bugle head that sinks without tearing the paper; a self-drilling (TEK) screw cuts its own hole and enters a steel stud with no pilot at all.

A trapezoidal roofing screw comes with a sealing washer: on a metal roof it is not the screw that keeps the hole watertight but the EPDM washer beneath its head.

Screw	Material	Pilot hole	Note
Chipboard screw	Timber, chipboard, MDF	Needed in hardwood	General purpose, coarse thread
Drywall screw (sharp)	Plasterboard + timber stud	Not needed	Bugle head, sinks flush
Drywall screw (drill point)	Plasterboard + steel stud	Not needed	Self-drilling point
Self-drilling (TEK)	Sheet, profile, joinery	Not needed	Drills its own hole
Roofing screw	Trapezoidal sheet, sandwich panel	Not needed	EPDM sealing washer

How to read diameter and length

The 4.5x45 in a product name means a 4.5 mm shank diameter and a 45 mm length. Length is measured from under the head on pan-head screws, and from the top of the head on countersunk ones.

A working rule: after passing through the piece being fixed, the screw should enter the base material by at least twice that thickness. For 18 mm chipboard, a 45-50 mm screw is the usual pick. Box quantities follow the size: thin, short sizes come in boxes of 1,000, thick and long ones in 50-100.

First number: shank diameter in mm — it sets the holding power.
Second number: length in mm — it sets the depth into the base material.
In hardwood, drill a pilot slightly under the shank diameter to stop splitting.
Coating: zinc or phosphate indoors, galvanised outdoors, stainless when wet.

Points and heads

The head decides how the screw sits against the surface: a countersunk head sinks flush, while pan and hex heads stay proud and give a wider clamping face. The recess is PZ (pozidriv), PH (phillips) or TX (torx); a TX recess transmits more torque and does not cam out.

Matching the driver bit to the recess directly affects service life: a PH bit in a PZ screw ruins both the recess and the bit.

Frequently Asked Questions

Is a chipboard screw the same as a wood screw?
In practice yes; a chipboard screw is fully threaded with a coarse thread and has replaced the classic wood screw in most joinery work. In hardwood you still drill a pilot hole to avoid splitting.
What does 4.5x45 mean?
A 4.5 mm shank diameter and a 45 mm length. The first figure sets the holding power, the second the depth into the base material.
How thick a section will a self-drilling screw go through?
It depends on the drill point length; the TEK sizes in this catalogue typically work in 1-3 mm sheet with no pilot hole. Thicker sections need a pilot.
Where do the sharp and drill-point drywall screws go?
The sharp point goes into timber studs and the drill point into steel studs. A sharp-point screw will lose its tip trying to enter a steel profile.
Why does a roofing screw have a washer?
On a metal roof, water enters through the hole the screw makes. The EPDM-bonded washer under the head seals that hole as it is tightened; without a sound washer the screw itself seals nothing.
How many are in a box?
It follows the size: thin, short sizes come in 500-1,000 piece boxes, thick and long ones in 50-200. The quantity is stated in the product name.