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  Tapping Drills for BA taps 

   Tapping Drills for Brass  BSB 26tpi taps 

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Tapping Drill HSS for BSW taps 1/16x60 BSW tap use 1.2mm tapping drill, 3/32x48 BSW tap use 1.9mm tapping drill, 1/8x40 BSW tap use 2.55mm tapping drill, 5/32x32 BSW tap use 3.2mm tapping drill, 3/16x24 BSW tap use 3.7mm tapping drill, 7/32x24 BSW tap use 4.5mm tapping drill, 1/4x20 BSW tap use 5.1mm tapping drill, 9/32x20 BSW tap use 5.8mm tapping drill, 5/16x18 BSW tap use 6.5mm tapping drill, 3/8x16 BSW tap use 7.9mm tapping drill, 7/16x14 BSW tap use 1.2mm tapping drill, 1/2x12 BSW tap use 10.5mm tapping drill, 9/16x12 BSW tap use 12.1mm tapping drill, 5/8x11 BSW tap use 13.5mm tapping drill, 11/16x11 BSW tap use 15.1mm tapping drill, 3/4x10 BSW tap use 16.25mm tapping drill, 7/8x9 BSW tap use 19.25mm tapping drill, 15/16x9 BSW tap, 1"x8 BSW tap use 22mm tapping drill, 1.1/8x7 BSW tap use 24.75mm tapping drill, 1.1/4x7 BSW tap use 28mm tapping drill, 1.3/8x6 BSW tap use 30mm tapping drill, 1.1/2x6 BSW tap use 33.5mm tapping drill, 1.5/8x5 BSW tap use 36mm tapping drill, 1.3/4x5 BSW tap use 39mm tapping drill, 1.7/8x4.1/2 BSW tap use 41.3mm tapping drill, 2"x4.1/2 BSW tap use 44.5mm tapping 

Tapping Drill HSS for BSF taps 3/16x32 BSF tap use 4mm tapping drill, 7/32x28 BSF tap use 4.6mm tapping drill, 1/4x26 BSF tap use 5.3mm tapping drill, 9/32x26 BSF tap use 6mm tapping drill, 5/16x22 BSF tap use 6.8mm tapping drill, 3/8x20 BSF tap use 8.3mm tapping drill, 7/16x18 BSF tap use 9.7mm tapping drill, 1/2x16 BSF tap use 11.1mm tapping drill, 9/16x16 BSF tap use 12.7mm tapping drill, 5/8x14 BSF tap use 14mm tapping drill, 11/16x14 BSF tap use 15.5mm tapping drill, 3/4x12 BSF tap use 16.75mm tapping drill, 7/8x11 BSF tap use 19.75mm tapping drill, 15/16x11 BSF tap use 21.5mm tapping drill, 1"x10 BSF tap use 22.75mm tapping drill, 1.1/8x9 BSF tap use 25.5mm tapping drill, 1.1/4x9 BSF tap use 28.5mm tapping drill, 1.3/8x8 BSF tap use 31.5mm tapping drill, 1.1/2x8 BSF tap use 34.5mm tapping drill, 1.5/8x8 BSF tap use 37.7mm tapping drill, 1.3/4x7 BSF tap use 41mm tapping drill, 1.7/8x7 BSF tap use 43.7mm tapping drill, 2"x7 BSF tap use 47mm tapping drill

Tapping Drill HSS for NC UNC NC taps 1/4x20 UNC ANC taps use 5.1mm tapping drill, 5/16x18 UNC ANC tap use 6.6mm tapping drill, 3/8x16 ANC UNC use 8mm tapping drill, 7/16x14 UNC ANC use 9.4mm tapping drill, 1/2x13 UNC ANC taps use 10.8mm tapping drill, 9/16x12 ANC UNC tap use 10.2mm tapping drill, 5/8x11 ANC UNC taps use 13.5mm tapping drill, 3/4x10 UNC ANC taps use 16.5mm tapping drill, 7/8x9 ANC UNC tap use 19.5mm tapping drill, 1"x8 UNC ANC taps use 23.25mm tapping drill, 1-1/8x7 ANC UNC tap use 25mm tapping drill, 1-1/4x7 UNC ANC taps use 28mm tapping drill, 1-3/8 UNC ANC taps use 30.75mm tapping drill, 1-1/2 ANC UNC tap use 34mm tapping drill, 1-3/4 ANC UNC tap use 39.5mm tapping tapping drill 1x64 UNC ANC taps use 1.55mm tapping drill, 2x56 UNC ANC tap use 1.85mm tapping drill, 3x48 UNC ANC tap use 2.1mm tapping drill, 4x40 UNC ANC taps use 2.35mm tapping drill, 5x40 UNC tap use 2.65mm tapping drill, 6x32 UNC ANC taps use 2.85mm tapping drill, 8x32 UNC ANC tap use 3.5mm tapping drill, 10x24 UNC ANC taps use 3.9mm tapping drill, 12x24 UNC ANC tap use 4.5mm tapping drill

Tapping Drill HSS for UNF ANF NF taps 1/4x28 UNF ANF taps use 5.5mm tapping drill. 5/16x24 UNF ANF tap use 6.9mm tapping drill, 3/8x24 UNF taps use 8.6mm tapping drill, 7/16x20 ANF taps use 9.9mm tapping drill, 1/2x20 UNF ANF taps use 11.6mm tapping drill, 9/16x18 UNF ANF taps use 12.9mm tapping drill, 5/8x18 UNF taps use 14.5mm tapping drill, 3/4x16 ANF taps use 17.5mm tapping drill, 7/8x14 UNF tap use 20.4mm tapping drill, 1"x12 UNF ANF taps use 23.25mm tapping drill, 1.1/8x12 UNF ANF taps use 26.5mm tapping drill, 1.1/4x12 UNF ANF taps use 29.5mm tapping drill, 1.3/8 x 12 NF taps use 32.75mm tapping drill, 1.1/2x12 UNF ANF taps use 36mm tapping 0x80 UNF ANF taps use 1.25mm tapping drill, 1x72 UNF ANF taps use 1.55mm tapping drill, 2x64 UNF ANF taps use 1.9mm tapping drill, 3x56 UNF ANF tapsuse 2.15mm tapping drill, 4x48 UNF taps use 2.4mm tapping drill, 5x44 UNF ANF taps use 2.7mm tapping drill, 6x40 UNF ANF taps use 2.95mm tapping drill, 8x36 UNF ANF taps use 3.5mm tapping drill, 10x32 UNF ANF taps use 4.1mm tapping drill, 12x28 UNF tap use 4.7mm tapping drill

Tapping Drill HSS for Metric taps 0.8x.19 tap use 0.61mm tapping drill, 0.9x.21 tap use 0.69mm tapping drill, 1x.25 taps use 0.75mm drill, 1.2x.25 taps use 0.95mm tapping drill, 1.4x.3 tap use 1.1mm drill, 1.6x.35 taps use 1.25mm tapping drill, 1.8x.35mm tap set use 1.45mm drill, 2x.4 tap use 1.6mm tapping drill, 2x.45 tap use 1.55mm drill, 2.2x.45mm cycle spoke size use 1.75mm drill, 2.3x.4 tap use 1.9mm tapping drill, 2.5x.45 tap use 2.05mm drill, 2.6x.45 tap use 2.15mm drill, 3x.5 tap use 2.5mm drill, 3x.35mm tap use 2.65mm drill 3x.6mm tap use 2.4mm drill, 3.5x.6 tap use 2.9mm drill, 4x.7 taps use 3.3mm drill, 4x.5 tap use 3.5mm tapping drill, 4x.75mm tap use 3.25mm drill, 5x1 tap use 4mm drill, 5x.5mm tap use 4.5mm drill, 5x.75 tap use 4.25mm drill, 5x.8 tap use 4.2mm drill, 5x.9 tap use 4.1mm drill, 5.5x.9mm tap use 4.6mm drill, 6x1 taps use 5mm tapping drill, 6x.5mm tap use 5.5mm drill, 6x.75 tap use 5.25mm tapping drill, 7x.75 tap use 6.25mm drill, 7x1 tap use 6mm tapping drill, 8x1.25 taps use 6.75mm drill, 8x.75mm tap use 7.25mm tapping drill, 9x1 tap use 8mm drill, 9x1.25 taps use 7.75mm drill, 10x.75 tap use 9.25mm drill, 10x1mm use 9mm tapping drill, 10x1.25 taps use 8.75mm drill, 10x1.5 taps use 8.5mm tapping drill, 11x.75mm use 10.25mm drill, 11x1.5 taps use 9.5mm tapping drill, 12x1 use 11mm drill, 12x1.25 mm use 10.75mm drill, 12x1.5mm use 10.5mm tapping drill, 12x1.75 taps use 10.25mm drill, 13x1.25 mm use 11.75mm drill, 13x1.75mm use 11.25mm tapping drill, 14x1 tap use 13mm drill, 14x1.25mm use 12.75mm tapping drill, 14x1.5mm use 12.5mm drill, 14x2 tap use 12mm drill, 15x1 tap use 14mm tapping drill, 15x2mm taps use 14mm drill, 16x1mm use 15mm tapping drill, 16x1.5 tap use 14.5mm drill, 16x2 taps use 14mm drill, 18x1 mm use 17mm drill, 18x1.5 use 16.5mm tapping drill 18x2mm use 16mm tapping drill, 18x2.5 tap use 15.5mm drill, 20x1 tap use 19mm drill, 20x2.5 tap use 17.5mm drill, 22x1.5mm use 20.5mm tapping drill, 22x2 tap use 20mm tapping drill, 22 x 2.5, taps use 19.5mm drill, 24x1 mm use 23mm tapping drill, 24x1.5 use 22.5mm drill,  24x2 tap use 22mm tapping drill, 24x3 tap use 21mm drill, 25x1.5 tap use 23.5mm tapping drill, 27x1.5 mm use 25.5mm drill, 27x2 tap use 25mm tapping drill, 27x3 tap use 24mm drill, 30x1mm use 29mm tapping drill, 30x1.5 tap use 28.5mm drill, 30x2 mm use 28mm tapping drill, 30x3 tap use 27mm drill, 30x3.5 tap use 26.5mm tapping drill, 32x1.5 mm use 30.5mm drill, 32x2 tap use 30mm tapping drill, 32mm taps 33x1.5 tap 33x2 tap use 31mm drill, 33x3.5 tap 36x1.5 mm, 36x3 tap use 33mm drill, 36x4 use 32mm tapping drill, 39x1.5 tap, 39x4 mm use 35mm tapping drill, 39mm taps 40x1.5 tap, 42mm 42x4.5 tap use 37.5mm drill 45x4.5 tap use 40.5mm drill, 48x5 tap, 52x5 tap use 47mm drill, 56x5.5 tap, 60x5.5 tap

Tapping Drill HSS for BSP taps 1/8x28 BSP taps use 8.8mm tapping drill, 1/4x19 BSP tap use 11.8mm tapping drill, 3/8x19 BSP tapuse 15.25mm tapping drill, 1/2x14 BSP tap use 19mm tapping drill, 5/8x14 BSP tap use 21mm tapping drill, 3/4x14 BSP taps use 24.5mm tapping drill, 7/8x14 BSP tap use 28.25mm tapping drill, 1"x11 BSP tap use 30.75mm tapping drill, 1-1/4x11 BSP tap use 39.5mm tapping drill, 1-1/2x11 BSP tap use 45mm tapping drill, 1-3/4x11 BSP tap use 51mm tapping drill, 2"x11 BSP tap use 57mm tapping drill

Tapping Drill HSS for BSPT taps 1/8x28 BSPT taps use 8.8mm tapping drill, 1/4x19 BSPT tap use 11.8mm tapping drill, 3/8x19 BSPT tap use 15.25mm tapping drill, 1/2x14 BSPT tap use 19mm tapping drill, 5/8x14 BSPT tap use 21mm tapping drill, 3/4x14 BSPT taps use 24.5mm tapping drill, 7/8x14 BSPT tap use 28.25mm tapping drill, 1"x11 BSPT tap use 30.75mm tapping drill, 1-1/4x11 BSPT tap use 39.5mm tapping drill, 1-1/2x11 BSPT tap use 45mm tapping drill, 2"x11 BSPT tap use 57mm tapping drill

Tapping Drill HSS for NPT taps 1/8x27 NPT taps use 8.7mm tapping drill, 1/4x18 NPT tap use 11.1mm tapping drill, 3/8x18 NPT tap use 14.5mm tapping drill, 1/2x14 NPT tap use 18mm tapping drill, 3/4x14 NPT taps use 23.25mm tapping drill, 1"x11.5 NPT tap use 29mm tapping drill, 1-1/4x11 NPT tap use 38mm tapping drill, 1-1/2x11.5 NPT tap use 44mm tapping drill, 2"x11.5 NPT tap use 56mm tapping drill

Tapping Drill HSS for Cycle 26tpi + 20tpi taps 1/4x26 cycle taps use 5.6mm tapping drill, 9/32x26 tpi BS Cycle use 6.35mm tapping drill, 5/16x26 BSC Cycle tap use 7.2mm tapping drill, 3/8x26 BS Cycle use 8.7mm tapping drill, 7/16x26 tpi CEI tap use 10.3mm tapping drill, 1/2x26 taps use 11.9mm tapping drill, 9/16x26 Cycle tap use 13.50mm tapping drill, 5/8x26 cycle tap use 15mm tapping drill, 3/4x26 tap use 18.2mm tapping drill, Lefthand 9/16x20 tap use 13.1mm tapping drill, Left hand5/8x20 tap use 14.5mm tapping drill, 3/4x20 tap use 17.8mm tapping drill

Tapping Drill HSS for Model Engineering ME 32tpi 40tpi taps 1/8x40 ME tap use 2.55mm tapping drill, 5/32x32 ME tap use 3.2mm tapping drill, 5/32x40 ME taps use 3.3mm tapping drill, 3/16x32 ME use 4mm tapping drill, 3/16x40 ME tap use 4mm tapping drill, 7/32x32 ME tap use 4.8mm tapping drill, 7/32x40 ME taps use 5.5mm tapping drill, 1/4x32ME tap use 5.5mm tapping drill, 1/4x40 ME taps use 5.5mm tapping drill, 9/32x32 ME use 6.1mm tapping drill, 9/32x40 Model Engineer tap use 6.2mm tapping drill, 5/16x32 ME taps use 7mm tapping drill, 5/16x40 ME use 7.3mm tapping drill, 3/8x32 ME use 7mm tapping drill, 3/8x40 ME taps use 7.3mm tapping drill, 7/16x32 ME use 10.3mm tapping drill, 7/16x40 ME tap use 10.5mm tapping drill, 1/2x32 ME use 11.9mm tapping drill, 1/2x40 Model Engineer taps use 12mm tapping drill

Tapping Drill HSS for BA taps 0 BA taps use 5.1mm tapping drill, 1 BA set use 4.5mm tapping drill, 2 BA taps use 4mm tapping drill, 3 BA set use 3.4mm tapping drill, 4 BA tap use 3mm tapping drill, 5 BA taps use 2.65mm tapping drill, 6BA tap use 2.3mm tapping drill, 7 BA tap use 2.05mm tapping drill, 8BA tap use 1.8mm tapping drill, 9 BA set use 1.55mm tapping drill, 10 BA taps use 1.4mm tapping drill, 11BA tap use 1.2mm tapping drill, 12BA taps use 1.05mm tapping drill, 13 BA taps set use .98mm tapping drill, 14 BA taps use .8mm tapping drill, 15 BA tap use .7mm tapping drill, 16BA tap use .6mm tapping drill

Tapping Drill HSS for BSB 26tpi + 20tpi taps 1/4x26 BSB tap use 1.2mm tapping drill, 5/16x26 for Brass tap use 7.2mm tapping drill, 3/8x26 Brass use 8.4mm tapping drill, 7/16 x 26 BSB 26tpi tap use 10mm tapping drill, 1/2x26 BSB taps 26tpi use 11.5mm tapping drill, 9/16x26 BSB tap use 13.1mm tapping drill, 26 tpi 5/8x26 BSB taps use 14.7mm tapping drill