WELCOME TO OUR Size of screws PROJECT

To promote your business on this page, click here to find out more!

Summary: The different sizes of screws and the conversion from metric to imperial sizes.

Share and bookmark DIY Doctor

Visit our Blog - Click Here

RSS news feed

<< Back to projects

Screw sizes are a mystery to most people so we have tried to make life a little easier with the table below. A wood screw is sized by two different numbers. First is the diameter of the screw. The larger Phillips Head the number, the larger the diameter. A number 4 screw is much smaller than a number 12 screw. The length is given next and it should be remembered that the length given for a screw is the length that is buried in the wood or other material, it does not onclude the head of raised, or domed headed screws.

Slotted screws are fast becoming history and cross head screws are now the fashion but it must be remembered that a cross head screw can either be a Philips screw (Top image)or a Pozidrive Head

pozidrive/supadrive screw. They both require a different driver which can be found below.

See also our project on different types of screw and Countersinking. Pilot holes should also be used when insering screws.

Metric/Imperial Conversion Chart
Gauge mm	Length mm	Imperial Size	Gauge mm	Length mm	Imperial Size
3	12	4 x 1/2	3.5	12	6 x 1/2
	16	4 x 5/8		16	6 x 5/8
	20	4 x 3/4		20	6 x 3/4
	25	4 x 1		25	6 x 1
	30	4 x 1 1/4		30	6 x 1 1/4
	40	4 x 1 1/2		40	6 x 1 1/2
4	12	8 x 1/2	4.5	25	9 x 1
	16	8 x 5/8		30	9 x 1 1/4
	20	8 x 3/4		35	9 x 1 3/8
	25	8 x 1		40	9 x 1 1/2
	30	8 x 1 1/4		45	9 x 1 3/4
	35	8 x 1 3/8		50	9 x 2
	40	8 x 1 1/2		60	9 x 2 3/8
	45	8 x 1 3/4		70	9 x 2 3/4
	50	8 x 2		75	9 x 3
	60	8 x 2 3/8
	70	8 x 2 3/4
5	25	10 x 1	6	30	12 x 1 1/4
	30	10 x 1 1/4		40	12 x 1 1/2
	35	10 x 1 3/8		50	12 x 2
	40	10 x 1 1/2		60	12 x 2 3/8
	45	10 x 1 3/4		70	12 x 2 3/4
	50	10 x 2		75	12 x 3
	60	10 x 2 3/8		80	12 x 3 1/4
	70	10 x 2 3/4		90	12 x 3 1/2
	75	10 x 3		100	12 x 4
	80	10 x 3 1/4		110	12 x 4 3/8
	90	10 x 3 1/2		130	12 x 5 1/8
	100	10 x 4		150	12 x 6

Was this project useful?

	Yes, this project was useful
	No, this project was not useful

Email Address: *
Comments:
	Can't read this code? Try a different code

* Required Field (By submitting your email address you are agreeing to DIY Doctor Ltd using it to contact you with relevant information and offers. It will not be passed onto 3rd parties) Any questions should be posted to our Forum

Top Tools

Click on a tool below for additional information.

1000V Insulated VDE Screwdriver Set 7 Pc	Coach Screws BZP M8 x 100mm Pack of 50	Collated Drywall Black Coarse Thread Screws 3.5 x 25mm Pk of 1000	Collated Flooring Screws Zinc & Yellow Passivated 4.5 x 75mm Pk1000
CSK Machine Screw A2 Stainless Steel M6 x 25mm Pack of 50	Goldscrew Countersunk 6 150mm Pack of 50	Makita 6843 110V Auto-Feed Screwdriver	Makita P-57283 Screwdriver Bit Set 30Pc

Much more construction information is available in our bookstore. All the tools and fittings you need in the toolstore.

Forums

Are you a tradesman ? Get your very own webpage with ProblemSolved all for FREE - Click here

Share and bookmark DIY Doctor

Link to DIY Doctor - Click Here

RSS news feed

Fixing to walls problems
	-> Fixing to walls problems

Topics		Replies	Author	Views	Last Post
	Problem walls	4	JK01	2498	moger4
	Where do wiring & reinforcements reside in walls?	1	diynewbie	1185	moger4
	Fixing Cabinet to brick wall lined with 25mm Thermal Board	1	ALJOLSON	1181	moger4
	How do i remove redidrivers?	1	vic101	1123	moger4
	Hairline Rendering Cracks!	1	alan589	1556	moger4
	Fixing an uplighter	1	jaymac25	794	moger4
	Drilling into the wall?	4	OrangeSoc	1264	moger4
	Which fixings for new lounge extension?	1	rickysmit	125	moger4
	fixing curtain poles to plasterboard ceiling	1	littlemou	373	moger4
	Hollow core door	1	RoyG	128	moger4
	RediDrivas too long	5	migthegre	367	moger4
	Helpless girl trying to fix splashback to wall	1	Lesley197	137	rosebery
	Dunelm Blind Fixing?!?!?!	14	paulevans	2416	lgaylor
	Fixing wall cabinets to no fines concrete wall	0	laus211	237	laus211
	Curtain fixing - plaster wall	3	sween	1607	bd3cc
	Blinds too heavy for plasterboard	3	Platti	2864	januspilo
	fixing venisian blinds in the bathroom!	1	Leeroy81	209	plumbbob
	Drilling a hole above window	1	terry1	359	fixings m
	Drilling Correctly	1	mendonl	278	stoneyboy
	Attaching blind to metal window lintel	3	Tortoise	930	bd3cc
	Fixing standard size clock to wall	1	frankino	359	Steve the
	Fixings for removable panels?	1	JEJeffrey	434	stoneyboy
	GATE fixing - fence posts to walls...?	2	Samantha_	721	Samantha_
	Positioning a Mirror in a Bathroom	1	neilstace	395	chris_on_
	Fixing to a ceiling	1	Grant	587	chris_on_
	How long does it take...	3	paulevans	611	htg engin
	Fixing Garden Sail Shade to uPVC Conservatory Window Frame	3	ptarmigan	717	htg engin
	Spores due to external water penatration	1	pollypock	475	stoneyboy
	Removing small metal steps from external wall	0	numpty197	594	numpty197
	what drill bit will drill into concrete walls with pebbles	2	dingbat	1187	Steve the
	Roller blind problems	1	joenderby	930	stoneyboy
	Fixings for heavy shelving to plasterboard?	1	conks	1748	rosebery
	Fixing motorised awning to thermalite blockwork	2	djhblinds	1016	fixings m
	Fixing kitchen wall unit	2	Python	1174	rosebery
	fixing a tv bracket to the wall...	1	foley	1507	bd3cc
	Fixing wash basin to brick wall	3	bemused	1502	bemused
	Fixing cladding...	1	3barrels	866	rosebery
	6inch oak gate post into brick - Is this ok ?	6	stuieg	2049	fixings m
	Holes in plasterboard from rawl plugs	4	Theo Cupi	2194	fixings m
	mounting 8mm bath screen on stud wall	4	brokenbet	1486	brokenbet
	Replacing a fixing to a Plasterboard Wall	3	Colin1	1551	Colin1
	Fixing a TV bracket	5	nikkimorg	2593	rosebery
	Radiator in bay window	1	tooly	1183	plumbbob
	do i need a setting tool?	3	covlad	1321	chris_on_
	filling a hole in brickwork for shelves	4	larney-me	1446	chris_on_
	where do i find a wooden pole to expand my wardrobe closet?	2	hermosa81	1029	chris_on_
	Screw/bolt sizes	1	fess	2666	stoneyboy
	Seriously ruined screw	1	mike1	1358	rosebery
	Plasterboard-covered walls	4	JohnB333	2668	JohnB333
	Removing pen and colour felt tip marks from walls	1	Sideshowm	1633	TheDoctor
Display topics from previous:

	-> Fixing to walls problems

Jump to:


Belle Mini Mix 150 Concrete Mixer	Karcher Pressure Washer 160Bar	Gripfill 350ml	Larch Lap Overlap Double Door Apex Shed 7 x 7

Dewalt DC100KA-GB 18V Cordless Combi Drill	Ryobi EJS-600QEO 240V 600W Jigsaw	BOSCH GBH 2-18 2kg 110V SDS Plus Drill	Makita MLS100/2 250mm 240V Compound Mitre Saw

Screwdriver Set Chrome Vanadium 49Pc	Bahco 244 Handsaw 20"	TurboUltra™ Pro Case System 2000 Pieces	Rolling Tool Chest