US Wood Screws - Pilot Holes

Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters.

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Wood screws - shank diameters and pitot holes

Approximate hole size for wood screws used in hard wood and soft wood:

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Nominal Size no.	Nominal Shank Diameter (in)	Actual Shank Diameter (in)	Twist Drill Size
			Pilot Holes				Shank Clearance Holes		80^o Countersink Diameter
			Hard Wood		Soft Wood		Shank Clearance Holes		80^o Countersink Diameter
			Inch	No.	Inches	No.	Inch	No.	Actual Head Diameter (in)	Diameter (in)
0	0.060	0.064	3/64	58	1/32	69	1/16	52	0.119	1/8
1	0.073	0.077	3/64	55	1/32	65	5/64	47	0.146	3/16
2	0.086	0.090	1/16	53	3/64	59	3/32	42	0.172	3/16
3	0.099	0.103	1/16	51	3/64	56	7/64	37	0.199	1/4
4	0.112	0.116	5/64	48	3/64	55	7/64	32	0.225	1/4
5	0.125	0.129	5/64	44	1/16	53	1/8	30	0.252	1/4
6	0.138	0.142	3/32	42	1/16	52	9/64	27	0.279	3/8
7	0.151	0.155	3/32	38	1/16	50	5/32	22	0.305	3/8
8	0.164	0.168	7/64	35	5/64	48	11/64	18	0.332	3/8
9	0.177	0.181	1/8	32	5/64	46	3/16	14	0.358	3/8
10	0.190	0.194	1/8	30	3/32	44	3/16	10	0.385	1/2
11	0.203	0.207	1/8	29	3/32	43	13/64	4	0.412	1/2
12	0.216	0.220	9/64	27	3/32	39	7/32	2	0.438	1/2
14	0.242	0.246	5/32	20	7/64	34	1/4	D	0.507	1/2
16	0.268	0.272	3/16	16	1/8	31	17/64	I	0.544	5/8
18	0.294	0.298	3/16	10	9/64	29	19/64	N	0.635	5/8
20	0.320	0.324	7/32	3	5/32	26	21/64	P	0.650	3/4
24	0.372	0.376	1/4	D	11/64	18	3/8	V	0.762	3/4

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US Wood Screws - Pilot Holes

Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters.

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