Standard Tap & Drill Sizes
American Std. and Unified Form Threads

Tap Drill Size is approximately 75% Thread
(Printer Friendly Version)

or click here >>> for HUGE 10 PAGE - Expanded Tap & Drill Chart:
includes USS, SAE, METRIC, PIPE SIZES 
& PILOT DRILL RECOMMENDATIONS IN HARD & SOFT WOOD ALSO

Thread Drill   Thread Drill   Thread Drill
0-80 3/64   1/4-20 7   1-12 59/64

1-64

53

  1/4-28 3   1 1/8-7 63/64

1-72

53

  5/16-18 F   1 1/8-12 1-3/64
2-56

50*

  5/16-24 I   1 1/4-7 1-7/64
2-64 50   3/8-16 5/16   1 1/4-12 1-11/64
3-48 47*   3/8-24 Q   1 3/8 -6 1-7/32
3-56.  45*   7/16-14 U   1 3/8-12 1-19/64
4-40 43   7/16-20 25/64*   1 1/2 -6 1-11/32
4-48 42   1/2-13 27/64   1 1/2-12 1-27/64
5-40  38*   1/2-20 29/64   1 3/4 -5 1-9/16
5-44 37   9/16-12 31/64   2" - 4 1/2 1-25/32
6-32 36   9/16-18 33/64   2 1/4-4 1/2 2-1/32
6-40 33   5/8-11 17/32   2 1/2 - 4 2-1/4
8-32 29   5/8-18 37/64   2 3/4 - 4 2-1/2
8-36 29   3/4-10 21/32   3" - 4 2-3/4
10-24 25   3/4-16 11/16   3 1/4-4 3 "
10-32 21   7/8-9 49/64   3 1/2-4 3-1/4
12-24 16*   7/8-14 13/16   3 3/4-4 3-1/2
12-28 14*   1" -8 7/8   4" - 4 3-3/4
      1" -14 15/16      

*SOME SOURCES SUGGEST THE NEXT SIZE SMALLER THAN THESE SIZES.    USE THE
10pg.
Ex
panded Tap & Drill Chart
TO FIND OUT THE NEXT / ALTERNATE SIZE SMALLER.

 

 


God Bless America

Fairbury Fastener
23092 E. 800 North Rd. / U.S. Rt 24 East
Fairbury, IL 61739
Phone:  (815) 692-3848
  
FAX:  (815) 692-2200
E- Mail: 
sales @ fairbury fastener . com

Call 815-692-3848
to place your order

We do NOT process international orders.  Prices are subject to change and may be different than shown on our site.  
Call for current pricing.
 All Returns subject to restocking.

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