Tapping Screws, Sheet Metal Screws

TAPPING SCREWS (SHEET METAL SCREWS)

Tapping screws/sheet metal screws are threaded fasteners with the unique ability to “tap” their own mating internal thread when driven into preformed holes in metallic and non-metallic materials. Tapping screws/sheet metal screws are high strength, one-piece, one-side-installation fasteners. Because they form or cut their own mating thread, there is unusually good thread fit which enhances resistance to their loosening in service. Tapping screws/sheet metal screws can be disassembled and are generally reusable.

Hole Sizes for Tapping Screws

Tapping Screw Point

Type A

Type AB

Type B

Sizes Usually Available - (see Online Store for details)
#4 TAPPING SCREWS
#5 TAPPING SCREWS
#6 TAPPING SCREWS
#7 TAPPING SCREWS
#8 TAPPING SCREWS
#10 TAPPING SCREWS
#12 TAPPING SCREWS
#14 TAPPING SCREWS

Lengths Usually Available - (see Online Store for details)
3/16 in.
1/4 in.
5/16 in.
3/8 in.
7/16 in.
1/2 in.
9/16 in.
5/8 in.
3/4 in.
7/8 in.
1 in.
1 1/8 in.
1 1/4 in.
1 1/2 in.
1 5/8 in.
1 3/4 in.
2 in.
2 1/4 in.
2 1/2 in.
3 in.
3 1/2 in.
3 3/4 in.
4 in.

Suggested Hole Sizes for Types A, AB, and B Tapping Screws

Nominal Screw Size	Hole Diameter			Closest Drill Size to Mean Hole Diameter
Nominal Screw Size	Max	Mean	Min	Drill size	Drill Dia
0 - 48	0.049	0.046	0.043	56	0.0465
1 - 42	0.063	0.059	0.055	53	0.0595
2 - 32	0.077	0.072	0.067	49	0.073
3 - 28	0.090	0.084	0.078	45	0.082
4 - 24	0.103	0.096	0.089	41	0.096
5 - 20	0.114	0.107	0.100	36	0.1065
6 - 20	0.124	0.116	0.108	32	0.116
7 - 19	0.138	0.129	0.120	30	0.1285
8 - 18	0.148	0.138	0.128	29	0.136
10 - 16	0.170	0.159	0.148	21	0.159
12 - 14	0.194	0.182	0.169	14	0.182
1/4 - 14	0.226	0.211	0.196	4	0.209
5/16 - 12	0.289	0.270	0.251	I	0.272
3/8 - 12	0.356	0.333	0.310	Q	0.332
7/16 - 10	0.413	0.386	0.359	W	0.386
1/2 - 10	0.480	0.449	0.418	29/64	0.4531

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