Machinery's Handbook Pocket Companion

SCREW SOCKET KEYS AND BITS

Table 2: Applicability of Hexagon and Spline Keys and Bits

Nominal Key or Bit Size

Cap Screws 1960 Series

Flat Counter sunk Head Cap Screws

Button Head Cap Screws

Shoulder Screws

Set Screws

Nominal Screw Sizes

HEXAGON KEYS AND BITS

0.028

0

0.035

0

0

1 & 2

0.050

0

1 & 2

1 & 2

3 & 4

0.062

1

3 & 4

3&4

5 & 6

0.078

2 & 3

5 & 6

5&6

8

0.094

4 & 5

8

8

10

0.109

6

?

0.125

10

10

0.141

8

0.156

10

0.188

?

?

0.219

?

?

0.250

0.312

?

?

?

?

0.375

?

?

0.438

0.500

?

1

?

0.562

?

1 & 1 ?

?

0.625

1

1

1 & 1 ?

0.750

? & 1

1 ?

1

?

0.875

1 ? & 1

1 & 1 ?

1

1

1.000

1 ? & 1

1

1

1 & 2

1

1.250

1

2

1

1.500

2

1

1.750

2 & 2

2

2.000

2

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