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Besly Drill Selector for Maxx-Taps
Machine Screw Sizes
Tap Size UNJC or UNJF Aerospace Thread UNC-UNF Unified Threads
Product Minor
Dia. (MAX UNJ)*
Recommended Drill Size Product Minor
Dia. (MAX 3B)*
Recommended Drill Size
4-40 .0942 No. 42 (.0935) .0939 No. 42 (.0935)
5-40 .1072 No. 36 (.1065) .1062 No. 37 (.1042)
6-32 .1157 No. 33 (.1130) .1140 No. 34 (.1110)
8-32 .1417 3.5mm (.1378) .1389 No. 29 (.1360)
10-24 .1600  5/32 (.1562) .1555 No. 24 (.1520)
10-32 .1675 No. 20 (.1610) .1641 No. 21 (.1590)
* Select a drill that will produce a minor diameter as large as possible. It should not exceed the maximum product minor diameter for the class being tapped.

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