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DIE CLEARANCE FOR MILD STEEL

Die Clearance

The relationship of the larger die hole size is die clearance and is stated as a percentage of the thickness of the material being punched. The range of clearances varies from 10% for thin materials to 2-% for thicker materials. For 3/4" material the total die clearance is .150". 

GAGE OR SIZE APPROX. DEC. THICKNESS OVERALL CLEARANCE
30 .0120 Slip Fit
28 .0149 Slip Fit
26 .0179 Slip Fit
24 .0239 .003
22 .1299 .003
20 .0359 .004
18 .0478 .005
16 .0598 .005
14 .0747 .006
13 .0897 .009
12 .1046 .009
11 .1196 .011
1/8" .125 .011
10 .1345 .013
5/32" .156 .015
8 .164 .017
7 .1793 .021
3/16" .1875 .023
1/4" .250 .037
5/16" .3125 .047
3/8" .375 .057
1/2" .500 .075
5/8" .625 .125
3/4" .750 .150
NOTE: Most grades of half hard aluminum use the same clearance as shown above. In many cases, your own experience may dictate that you call for clearances different than the above, especially when punching other materials such as stainless. steels.

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Copyright 2001 METALWORKING BOOKS
Last modified: November 29, 2001