TO SELECT PHILLIPS DRIVER SIZE

Screw Type

SCREW DIAMETER & HEAD STYLE

Driver Bit Size

Oval, Pan & Flat

Round & Fillister

Truss

Machine & Tapping Screws

0-1 0-1 0-1 0
2-4 2-4 2-4 1
5-10 5-10 5-10 2
12-14 12-5/16 12-14 3
5/16-1/2 3/8-1/2 5/16-1/2 4

Wood Screws

0-1 0-1 0-1 0
2-4 2-4 2-4 1
5-9 5-10 6-10 2
10-16 11-16 12-16 3
18-24 18-24 18-24 4

 

SCREW TYPES - SIZES - THREADS PER INCH (TPI)

TAPPING SCREWS

MACHINE SCREWS

Types A

Type 17

Types AB 

Type B   

Machine and Thread cutting screws  

 Types 1, 23 & F    

Coarse

UNC-USS

Fine

UNF-SAE

SIZE - TPI SIZE - TPI SIZE - TPI SIZE - TPI
0-40 0-48   0-80
1-32 1-42 1-64 1-72
2-32 2-32 2-56 2-64
3-28 3-28 3-48 3-56
4-24 4-24 4-40 4-48
5-20 5-20 5-40 5-44
6-18 6-20 6-32 6-40
7-16 7-19 8-32 8-36
8-15 8-18 10-24 10-32
10-12 10-16 12-24 12-28
12-11 12-14 1/4-20 1/4-28
14-10 1/4-14 5/16-18 5/16-24
5/16-12 3/8-16 3/8-24
3/8-12 7/16-14 7/16-20
7/16-10 1/2-13 1/2-20
1/2-10 9/16-12 9/16-18
5/8-11 5/8-18
3/4-10 3/4-16
7/8-9 7/8-14
1-8 1-14
1-1/8 -7 1-1/8-12
1-1/4-7 1-1/4-12
1-3/8-6 1-3/8-12
1-1/2-6 1-1/2-12
1-5/8- 5-1/2 1-5/8-12
1-3/4 -5 1-3/4-12
1-7/8 -5 1-7/8-12
2-4-1/2 2-12