Screw Size Gauge

the shank with panel-pins either side, and soldering on a brass cross-piece. Screws of known gauge number can then be slid between the strips, the exact position dotted with a centre-punch and the gauge number and drill sizes scratched on the brass. Figure 252:4 shows the gauge with a No. 12 screw so marked.

Screw No.

Clearance Hole

Drill Hole

in

in

0

1/16

3/64

1

5/64

3/64

2/3

3/32

1/16

4

7/64

5/64

5

1/8

5/64

6

9/64

5/64

7

5/32

3/32

8

11/64

3/32

9

3/16

1/8

10

13/64

1/8

11

7/32

1/8

12

15/64

1/8

14

1/4

5/32

Metric values for all the above quoted inch sizes will depend on the units ultimately adopted by the International Standards Organization, as there are many different units quite unrelated to each other in use throughout the metric world at the present time.

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