Wood Screw Gauges

The wood screw gauges table below is a guide to show metric equivalents of common Imperial screw gauges. The table contains data on Head diameter and Countersink drill size, Shank diameter and Clearance drill size, Pilot hole sizes for Timber, Rawlplug colours and Masonry drill sizes

Imperial	Metric	Screw	Screw Head	Screw	Screw Shank	Softwood	Hardwood		Masonry
Screw	Screw	Head Dia	Countersink	Shank Dia	Clearance	Pilot Dia	Pilot Dia	Plug	Drill
Gauge No.	Guage mm	mm	Drill mm	mm	Drill mm	mm	mm	Colour	mm
2	2	4.36	6.0	2.38	2.5	1.5	1.5
3	2.5	5.16	6.0	2.77	3.0	1.5	1.5	Yellow	5
4	3	5.95	6.0	2.77	3.0	1.5	2.0	Yellow	5
6	3.5	7.14	8.0	3.57	4.0	2.0	2.5	Red	6
8	4	8.73	9.0	3.97	4.5	2.5	3.0	Red/Brown	6 or 7
10	5	9.92	10.0	4.76	5.5	3.0	3.0	Brown	7
12	5.5	11.11	11.0	5.55	6.5	3.0	3.5	Brown	7
14	6.5	12.70	12.0	6.35	7.0	3.5	4.0	Blue	10

Metal Gauges and Sheet Metal Sources

To compliment our wood screw gauges chart we also have a useful sheet metal gauge chart showing sheet metal thickness from 1 thou to 1/2 an inch in Imperial, or 0.03mm to 12.7mm in Metric.

If you are in need of any sheet metal you can visit Metal Sheets Ltd and go to our online store or visit our MetalOffCuts store to purchase sizes up to 1m x 1m.

Metalsheets and MetalOffCuts stock a wide selection of metals including Aluminium, Brass, Copper, Stainless Steel, Corten Steel and Zinc

A hand holding a verier gauge which is typically used to check wood screw gauges

Wood Screw Guages