Tapping Drill Sizes (Read-Only) - BATES Industrial

1 Tap size Pitch Tapping Drill mm M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48 M52 ISO METRIC (Coarse) METRIC (Fine) Tap size Pitch Tapping Drill mm M8 M10 M12 M12 M14 M16* M18 M20* M22 M24 * METRIC CONDUIT UNC (Unified National Coarse) Tap size Tapping Drill mm 3(.)

2 099) 48 4(.112) 40 5(.125) 40 6(.138) 32 8(.164) 32 10(.190) 24 12(.216) 24 1/4 20 5/16 18 3/8 16 7/16 14 1/2 13 9/16 12 5/8 11 3/4 10 7/8 9 1 8 1-1/8 7 1-1/4 7 1-1/2 6 UNF (Unified National Fine) Tap size Tapping Drill mm 3(.099) 56 4(.112) 48 5(.125) 44 6(.138) 40 8(.164) 36 10(.190) 32 12(.216) 28 3/16* 32 1/4 28 5/16 24 3/8 24 7/16 20 1/2 20 9/16 18 5/8 18 3/4 16 7/8 14 1 12 1 * 14 1-1/8 12 1-1/4 12 1-1/2 12 * UNS BSW (British Standard Whit)

3 Tap size Tapping Drill mm *3/32 48 1/8 40 *5/32 32 3/16 24 *7/32 24 1/4 20 5/16 18 3/8 16 7/16 14 1/2 12 9/16 12 5/8 11 3/4 10 7/8 9 1 8 1-1/8 7 1-1/4 7 1-1/2 6 1-3/4 5 2 4-1/2 * WHIT FORM BSF (British Standard Fine) Tap size Tapping Drill mm 3/16 32 1/4 26 5/16 22 3/8 20 7/16 18 1/2 16 9/16 16 5/8 14 3/4 12 7/8 11 1 10 1-1/8 9 1-1/4 9 1-1/2 8 1-3/4 7 SPARK PLUG Tap size Pitch Tapping Drill mm M10 M12 M14 M18 BSPT ISO Rc Taper Series Tap size Pitch Tapping Drill mm Rc1/8 28 Rc1/4 19 Rc3/8 19 Rc1/2 14 Rc3/4 14 Rc 1 11 Rc1-1/4 11 Rc1-1/2 11 Rc 2 11 BSPF ISO G Parallel Series Tap size Pitch Tapping Drill mm G1/8 28 G1/4 19 G3/8 19 G1/2 14 G5/8 14 G3/4

4 14 G7/8 14 G 1 11 G1-1/4 11 G1-1/2 11 G1-3/4 11 G 2 11 NPSF (Straight) DRYSEAL Tap size Pitch Tapping Drill mm 1/8 27 1/4 18 3/8 18 1/2 14 NPTF (Taper) DRYSEAL Tap size Pitch Tapping Drill mm 1/8 27 1/4 18 3/8 18 1/2 14 3/4 14 1 11-1/2 1-1/4 11-1/2 Always wear eye protection when using cutting tools. Taper pipe threads of improved quality are obtained when taper is pre-formed. The Tapping Drill Sizes indicated are recommended only and should give approximately 75% of thread depth . Tapping Drill Sizes To Convert Multiply by Inches to Millimetres Inches to Centimetres Inches to Metres Feet to Millimetres Feet to Centimetres Feet to Metres Yards to Metres Fathoms to Metres Chains to Metres Furlongs to Metres Miles to Kilometres LENGTH lbf/in2 = kPa kPa = lbf/in2 25 = 155 = 26 = 160 = 27 = 165 = 28 = 170 = 29 = 175 = 30 = 180 = 31 = 185 = 32 = 190 = 33 = 195 = 34 = 200 = 35 = 205 = TYRE PRESSURE POWER To Convert Multiply by Foot pounds-force per second into watts Horsepower into watts Foot pounds-force per second into kilowatts Horsepower into kilowatts Horsepower into metric horsepower