First diyer help with screws to buy

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Hi

Literally first time ever diy-er so apologies for some stupid questions.

Ive bought a combi drill to put up some shelves and blinds.

Im not entirely sure what screws to get for each fitting.

First i am putting up some blinds on a bracket above a window. It already has a batten fitted (20mm deep) - do i just get a 20mm screw or slightly smaller? Also im assuming for wood you just screw straight in? Not sure if the blind needs it to be countersinked or not screws but i can work that out when i open it

Also im planning on putting a tv mount up and ive found the stud im putting it on. What generally size screws are best for normal studs, its new build so assume its whatever standard stud size is i was going to go with 50mm screws.

Is there any particular good/ bad points to look for in screws in general?

Also any recommended good priced ones welcome thank you and apologies for silly questions
 
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For the batten, the screw length must be the same or less than the batten, so 20mm for those.

For most everything else, 1 1/2 x 8 twinthread screws will do. They are approximately 40mm long and 4mm diameter.
They can go direct into timber, provided the timber is thick enough.

They can also be used into masonry, which first requires a 5.5mm hole

and red wall plug

and if anything is supplied with it's own screws, throw them away immediately because they are always totally useless.
 
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Whats the difference between double countersunk and just countersunk screws, is there any benefit to either? Was looking at screwfix and its like £4 for 200 packs so not sure how to tell if its good quality or not

For example :


edit: also thank you for all your help!
 
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Countersunk have a head which can go flush with the surface.
counter.png



Double countersunk are the same, but with additional ribs on the underside so they partly cut into the timber as they are screwed in.
double.png



The other common type is pan head, which is designed to fix flat sheet materials with no countersink
pan.png
 
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Buy a "Trade pack" from SF or TS - you'll get a big selection to play about with, and I find they're never quite as long as you think they'll be (maybe that's just me). Unless you're a tradesman where time is money etc then the cheapest basic screws will do. You will learn which gauge (thickness) of screws works best with your choice of wall plugs/type of brick or block in your house.
 
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Hi, what about this for £20, large selection of 10 different sizes, should cover your present and all future requirements.

 
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