More Handles stocks a huge range of screws to suit all applications. Supplying the industry leading TIMco Brand of screws we are confident that we have the best screw for whatever your project.
Below we set out some useful infomation on how to identify and understand some of the common industry jargon when it comes to screws, and to help you know what kind of screw you should specify for which job.
Screw Types and Information
The information below details the different kind of recess and head types that are available from the TIMco range of screws, fixings and fasteners.
Screw Recess Types
TIM DRIVE RECESS / TORX DRIVE
High performance recess on TIMco Multi-Fix and Velocity Screws.
CROSS-RECESS / POZI RECESS
Standard recess for woodscrews, chipboard screws etc.
Standard recess for self-drilling and drywall screws.
Traditional recess for certain woodscrews.
SQUARE RECESS / ROBERTSON DRIVE
Recess on square drive pan self-drilling screws.
Screw Head Types
Designed for countersinking into timber for a flush or recessed finish.
DOUBLE COUNTERSUNK HEAD
Improved design on the countersunk head to give additional head strength and assist countersinking.
COUNTERSUNK RIBBED HEAD
Small ribs on the countersink to assist completion of countersinking.
A curved surface under the head to prevent damage or tearing to the plasterboard paper.
RAISED HEAD COUNTERSUNK
A countersunk head with a slight raised dome for an attractive finish. Ideal for use in hinges.
PAN / ROUND HEAD
Head with a flat underside. Designed for application fixing against metal surfaces.
WAFER HEAD OR FLANGE HEAD
Low profile head with a flat underside for applications where a large clamping area and an unobtrusive head is required.
HEXAGON HEAD WASHER FACE
Positive drive Hex Head with an integral washer to increase clamping effectiveness.
HEXAGON HEAD WITH WASHER
As above with EPDM washer to prevent water ingress.
Screw Thread Types
COARSE THREAD (up to 16 TPI)
Also know as spaced threads, they are normally used for all timber applications and for steel with lesser thickness (1-2.4mm normally).
FINE THREAD (over 16 TPI)
Also known as metric threads, they are only used in steel applications. Fine threads are for use with thicker steels (2.4 - 12mm thickness).
Also known as twin lead threads, they are designed to give a fast insertion time in soft material.
Is used in soft timbers, plastics and into thin sheet sections. Hi-Lo threads have superior holding power compared to a low TPI coarse thread in these types of material.
Screw Point Styles
NEEDLE / GIMLET AND SUPER SHARP POINT (SS)
Designed for piercing timber, mdf, plastic and light gauge metal up to 0.6mm without pre-drilling.
For use in heavy sheet material applications.
For use in shallow holes.
SELF DRILL POINT
For drilling into metals without the need for pre-drilling.
TYPE 17 POINT
Also known as slash point, they are used for fixing timber without the need to pre-drill. The slot at the end forms a cutting edge which reduces splitting of timber. It also penetrates thin sheet metal if required.
DOUBLE SLASH POINT
Designed to assist precisely when used in hard material such as plastic and thin sheet metal.
Screw Measuring Information
The measuring guides below explain how to measure a screw gauge, thread, threads per inch and how to measure the overall length of a screw.
The gauge of the screw is determined by the thread diameter.
Screw Thread Length
Below shows how to work out the thread length.
Screw Measuring Lengths
Fasteners with the following Head Types are measured from the underside of the head to the point of the screw:
Measurement to the point of the screw
Fasteners with the following head types are measured from the top of the head to the point of the screw:
Measurement to the point of the screw
Size Conversion Table
The table shows the closest conversion value from imperial to metric.
Screw Threads Per Inch (TPI)
The TPI is the number of thread crests that can be counted within 1” (25.4mm).
Please contact one of our Hardware Team at More Handles who are specialists in TIMco Screws and will be happy to advise and answer any questiosn you may have.