US Tap and Drill Bit Size Table

The tap size chart is providing the list of standard size taps, with the diameter and thread spacing. It is meant for fractional, metric, and screw sizes. Get to know 8-32 tap drill, 10-32 tap drill, and 6-32 tap drill size from the page. Customers will be able to buy the right kind of hardware by analyzing the tap drill size. The fractional sizes are listed in inches, while the metric sizes are listed in millimeters following the letter ‘M’. The decimal equivalent of the diameters here is shown in both the English and the Metric unit.

The best way to produce the thread holes is to drill a hole of the right size with a drill bit & tap it with a tap. The tap size chart on this page is the list of standard size drill bits in different measurement systems that include fractional, metric, wire gauge number, and letter. Details about 8-32 tap drill, 10-32 tap drill, 6-32 tap drill, and 6-32 drill size are mentioned here.

The thread pitch is used by the metric system for measuring the distance between threads, which is measured in millimeters. The approximate thread count is shown here based on the pitch for each thread count.

Tap Fractional Drill Bit Number Drill Bit Letter Drill Bit
#0-80 3/64" - -
#1-64 - 53 -
#2-56 - 50 -
#3-48 - 47 -
#4-40 3/32" 43 -
#5-40 - 38 -
#6-32 7/64" 35 -
#8-32 - 29 -
#10-24 5/32" 25 -
#10-32 5/32" 21 -
#12-24 11/64" 16 -
1/4"-20 13/64" 7 -
1/4"-28 7/32" 3 -
5/16"-18 17/64" - F
5/16"-24 - - I
3/8"-16 5/16" - -
3/8"-24 21/64" - Q
7/16"-14 23/64" - U
7/16"-20 25/64" - -
1/2"-13 27/64" - -
1/2"-20 29/64" - -
9/16"-12 31/64" - -
9/16"-18 33/64" - -
5/8"-11 17/32" - -
5/8"-18 37/64" - -
3/4"-10 21/32" - -
3/4"-16 11/16" - -
Drill sizes are for 75% depth of thread.

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