Different types of screw do many different types of job and as with everything else in the Construction Industry and DIY world, the job is much much easier with the right tools, equipment and products. Take a look at our table and click on the type of screw you need to go through and buy them from thesitebox.com. Screwdrivers are below. Screw sizes vary and generally the larger the number the bigger the screw. For example a number 6 screw is much smaller than a number 12 screw. There are many types of fixing for all types of material and circumsatnces so make sure you get the right one to make the job easy. It is usually much easier to insert screws when you have drilled a pilot hole. This prevents the screw from binding. See how to drill the correct size pilot holes by clicking on the links. Countersinking the screws also makes for a much neater job.

As well as every type of screw thesitebox.com can provide you with all of the other fixings and tools you may need for your project. You can buy safely and get free Buy Safely from thesitebox.com delivery.

Substrate/Finish	Type of screw	Reason	Internal	External
Hardwood	Twin thread.	Ease of start up and driving.	Zink plated twinthread	Brass or Black Jappaned screws
Soft Wood	Single thread.	Strength in position High pull-out retention.	Zink plated countersunk	See above
Chipboard	Single thread.	High pull-out retention.	Chipboard Countersunk screws .	Do not use chipboard outside.unless covered
MDF	Single thread with twin thread start.	Twin thread allows ease of start up and single thread provides high pull-out retention.	MDF Countersunk screws .	Do not use MDF outside unless covered.
Wood – Traditional Finish	Single thread	Traditional finish required to product.	Zink or brass roundhead screws	Brass ditto
Masonry	Single thread. Case hardened with groove in thread to allow dust to escape.	Single thread for hold and drive to grind into masonry.	Concrete & Masonry self tapping screws	Frame screws and hammer fixings
Metal	Self tapper	Cut their own thread into metal.	Self Tapping screws	Stainless steel self tappers
Plasterboard	Drywall screws.	Sharp piercing point with twin thread and bugle head for flush finish. Can be collated for speed of insertion.	Drywall screws	N/A
Floorboards	Twin thread for fast start, single thread for hold, countersunk head.	Ease of start up. High pull-out retention. Minimal splitting Flush finish.	Brass crosshead, countersunk screws	N/A
Decking	Sharp point, single thread with shank and countersunk head.	Pierce surface, strength in position. Minimise jacking up and splitting. Flush finish.	Decking screws	Deckings screws .
Roofing Sheet	Roofing screws.	Self-drilling and self-tapping with rubber bonded washer for weather proofing.	Roofing hook bolts or mushroom bolts or Aluminium nails	Roofing hook bolts or mushroom bolts or Aluminium nail
Fencing and Garden Furniture Marine	Rust resistant Easy to drive.	Resistant to corrosion. Speedy insertion.	Ulti Mate wood screws	.Ulti Mate wood screws

Never try to use the wrong screw. Not only will it be hard to put in but it may not hold for the job you want to do. For fixing methods to various surfaces, go abck to teh projects section. Fixing to masonry is a popular task as is fixing to plasterboard.