Sutton Tools Tapping Drill Size Chart

1 Threading Tapping Drill size Chart M UNC BSW. ISO METRIC COARSE (60 ) UNIFIED NATIONAL COARSE (60 ) BRITISH STANDARD WHITWORTH (55 ). Tap size Pitch Tapping Drill Tap size TPI Tapping Drill Tap size TPI Tapping Drill mm mm mm mm #2 (.086) 56 1/16* 60 M2 #3 (.099) 48 3/32* 48 #4 (.112) 40 1/8 40 M3 #5 (.125) 40 5/32* 32 #6 (.138) 32 3/16 24 M4 #8 (.164) 32 7/32* 24 #10 (.190) 24 1/4 20 M5 #12 (.216) 24 5/16 18 M6 1/4 20 3/8 16 M8 5/16 18 7/16 14 M10 3/8 16 1/2 12 M12 7/16 14 9/16 12 M14 1/2 13 5/8 11 M16 9/16 12 3/4 10 M18 5/8 11 7/8 9 M20 3/4 10 1 8 M22 7/8 9 1-1/8 7 M24 1 8 1-1/4 7 M27 1-1/8 7 1-1/2 6 M30 1-1/4 7 1-3/4 5 M33 1-3/8 6 2 4-1/2 M36 1-1/2 6 *WHIT. Form M42 1-3/4 5 M45 2 M48 BSF. M52 UNF BRITISH STANDARD FINE (55 ). M56 UNIFIED NATIONAL FINE (60 ) 3/16 32 #3 (.099) 56 7/32 28 MF #4 (.112) 48 1/4 26 ISO METRIC FINE (60 ) #5 (.)

2 125) 44 5/16 22 M4 #6 (.138) 40 3/8 20 M5 #8 (.164) 36 7/16 18 M6 #10 (.190) 32 1/2 16 M8 #12 (.216) 28 9/16 16 M10** 3/16* 32 5/8 14 M10 1/4 28 11/16 14 M12** 5/16 24 3/4 12 M12 3/8 24 7/8 11 M14** 7/16 20 1 10 M14 1/2 20 1-1/8 9 M16* 9/16 18 1-1/4 9 M18** 5/8 18 1-1/2 8 M20* 3/4 16 1-3/4 7 M22 7/8 14 M24 1 12 BSB. M25* 1* 14 BRITISH STANDARD BRASS (55 ). M32* 1-1/8 12 1/4 26 M40* 1-1/4 12 5/16 26 M50* 1-3/8 12 3/8 26 1-1/2 12 7/16 26 *Metric Conduit **Spark Plug 1/2 26 *UNS. 9/16 26 8UN (8 TPI) 5/8 26 UNIFIED NATIONAL FORM (60 ) UNEF 3/4 26 UNIFIED NATIONAL FORM (60 ) 7/8 26 1-1/8 8 1-1/4 8 1/4 32 1 26 1-3/8 8 5/16 32 1-1/2 8 3/8 32 1-5/8 8 1/2 28 1-3/4 8 5/8 24 1-7/8 8 3/4 20 18. 2 8 1 20 * Taper pipe threads of improved quality are obtained when the Tapping hole is pre-formed using Sutton Taper pipe Reamers. Threading Tapping Drill size Chart Rc (BSPT)* THREAD FORMING THREAD FORMING.

3 ISO Rc TAPER SERIES 1:16 (55 ) (FLUTELESS TAPS) (FLUTELESS TAPS). Tap size TPI Drill Drill & Tap size Pitch Tapping Drill Tap size Tapping Drill Only* Reamer mm mm mm Rc 1/16 28 METRIC COARSE UNC. Rc 1/8 28 Rc 1/4 19 M1 #1 (.073) 64 Rc 3/8 19 #2 (.086) 56 Rc 1/2 14 #3 (.099) 48 Rc 3/4 14 #4 (.112) 40 Rc 1 11 #5 (.125) 40 Rc 1-1/4 11 #6 (.138) 32 Rc 1-1/2 11 #8 (.164) 32 Rc 2 11 #10 (.190) 24 #12 (.216) 24 G (BSPF) 1/4 20 ISO G PARALLEL SERIES (55 ) 5/16 18 Tapping Drill 3/8 16 Tap size TPI M3 7/16 14 mm 1/2 13 G 1/16 28 M4 UNF. G 1/8 28 M5 G 1/4 19 #1 (.073) 72 M6 G 3/8 19 #2 (.086) 64 M8 G 1/2 14 #3 (.099) 56 M10 G 5/8 14 #4 (.112) 48 M12 G 3/4 14 #5 (.125) 44 G 7/8 14 BSW #6 (.138) 40 G1 11 1/8 40 #8 (.164) 36 G 1-1/4 11 5/32 32 #10 (.190) 32 G 1-1/2 11 3/16 24 #12 (.216) 28 G 1-3/4 11 1/4 20 1/4 28 G2 11 5/16 18 5/16 24 G 2-1/2 11 3/8 16 3/8 24 7/16 20 Rp (BSPPL).

4 SEALING pipe THREAD PARALLEL (55 ) 1/2 20 NPT-NPTF*. Rp 1/8 28 NATIONAL pipe TAPER 1:16 (60 ) G (BSPF). Rp 1/4 19 Drill Drill & 1/8 28 Rp 3/8 19 Tap size TPI. Only* Reamer 1/4 19 Rp 1/2 14 3/8 19 1/16 27 Rp 3/4 14 1/2 14 1/8 27 Rp 1 11 5/8 14 1/4 18 Rp 1-1/4 11 3/4 14 3/8 18 Rp 1-1/2 11 7/8 14 1/2 14 Rp 2 11 1 11 3/4 14 Pg (Steel Conduit) 1 11-1/2 (80 ) 1-1/4 11-1/2 BA. 1-1/2 11-1/2 44 BRITISH ASSOCIATION ( ). Pg7 20 2 11-1/2 Pg9 18 Tapping Drill Tap size Pitch Pg11 18 NPSF mm mm 18 NATIONAL pipe STRAIGHT (60 ) 0 1 Pg16 18 1 Pg21 15 Tap size TPI Tapping Drill mm 2 3 1/8 27 4 1/4 18 5 3/8 18 6 1/2 14 7 8 9 10 11 12 13 14 15 16