Pipe Taps

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what size hole do I drill for a 1/2-14 pipe tap?

Im drilling through 1 1/4" thick mild steel

You want to use a 23/32 .718 drill bit.
Start by spot drilling with a 1/4 or so then drill with the .718 bit.

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1 Z 1 16 27 ZNPT Taper Pipe HSS Tap 1 16 27 TPI CNC
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Interrupted Thrd Pipe Tap1 1 4 115S O OSG 1315801
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Pipe TapTaper3 4 14Bright5 Flt GREENFIELD THREADING 385489
Pipe TapTaper3 4 14Bright5 Flt GREENFIELD THREADING 385489
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Pipe TapTaper3 8 18Bright4 Flt GREENFIELD THREADING 387246
Pipe TapTaper3 8 18Bright4 Flt GREENFIELD THREADING 387246
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Greenfield Lot of 2 Pipe Taps Both are 1 11 1 2 NPT
Greenfield Lot of 2 Pipe Taps Both are 1 11 1 2 NPT
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Vintage W L Brubaker 7 Pieces Hand Taps 2 7 8 9 3 3 4 10 1 2 R 3 8 R
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Vintage W L Brubaker 9 Pc Hexagon USS Die Threader Set 3 8 to 1 1 8 HEX
Vintage W L Brubaker 9 Pc Hexagon USS Die Threader Set 3 8 to 1 1 8 HEX
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GREENFIELD THREADING Pipe TapSemi Bottoming1 11 1 2Bright 385539
GREENFIELD THREADING Pipe TapSemi Bottoming1 11 1 2Bright 385539
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NOS WIDELL Pipe Tap 2 8 HSS H 6 Model No 5450 BRAND NEW Solid Tool
NOS WIDELL Pipe Tap 2 8 HSS H 6 Model No 5450 BRAND NEW Solid Tool
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NOS MORSE 1 1 4 Carbon STEEL LEFT TAPER HAND PIPE TAP No1115
NOS MORSE 1 1 4 Carbon STEEL LEFT TAPER HAND PIPE TAP No1115
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NOS VERMONT 1 3 4 5 NC14 Pipe Tap BRAND NEW Solid Tool
NOS VERMONT 1 3 4 5 NC14 Pipe Tap BRAND NEW Solid Tool
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US Stock RC or ZG 1 4 19 BSPT Taper Pipe HSS Tap Superior
US Stock RC or ZG 1 4 19 BSPT Taper Pipe HSS Tap Superior
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Pipe TapTaper3 8 18Bright4 Flt GREENFIELD THREADING 385448
Pipe TapTaper3 8 18Bright4 Flt GREENFIELD THREADING 385448
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Pipe TapTaper3 4 14Bright5 Flt GREENFIELD THREADING 385505
Pipe TapTaper3 4 14Bright5 Flt GREENFIELD THREADING 385505
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Interrupted Thread Pipe Tap1 4 18Brt GREENFIELD THREADING 385786
Interrupted Thread Pipe Tap1 4 18Brt GREENFIELD THREADING 385786
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Vermont American 20372 1 4 18 Npt Pipe TapsNo 20372 Vermont American 3PK
Vermont American 20372 1 4 18 Npt Pipe TapsNo 20372 Vermont American 3PK
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Screw Tap Inch Thread G 1 8  Whitworth Pipe Thread EU Production NEW
Screw Tap Inch Thread G 1 8 Whitworth Pipe Thread EU Production NEW
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Screw Tap Inch Thread G 1 4  Whitworth Pipe Thread EU Production NEW
Screw Tap Inch Thread G 1 4 Whitworth Pipe Thread EU Production NEW
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Pipe TapTaper1 2 14Bright4 Flt GREENFIELD THREADING 385471
Pipe TapTaper1 2 14Bright4 Flt GREENFIELD THREADING 385471
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NORTH AMERICAN 15464 Extension Pipe Tap Plug 1 4 Inx18 Bright
NORTH AMERICAN 15464 Extension Pipe Tap Plug 1 4 Inx18 Bright
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NORTH AMERICAN 15818 Extension Pipe Tap Plug 3 8 Inx18 Bright
NORTH AMERICAN 15818 Extension Pipe Tap Plug 3 8 Inx18 Bright
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NORTH AMERICAN 15431 Pipe Tap Plug 1 8 Inx27 Bright
NORTH AMERICAN 15431 Pipe Tap Plug 1 8 Inx27 Bright
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Pipe TapTaper1 1 2 115Bright7 Flute GREENFIELD THREADING 385570
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Pipe TapTaper1 16 27Bright4 Flt GREENFIELD THREADING 385323
Pipe TapTaper1 16 27Bright4 Flt GREENFIELD THREADING 385323
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Pipe TapTaper1 8 27Bright4 Flt GREENFIELD THREADING 385356
Pipe TapTaper1 8 27Bright4 Flt GREENFIELD THREADING 385356
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Pipe TapTaper1 16 27TiN4 Flt GREENFIELD THREADING 385329
Pipe TapTaper1 16 27TiN4 Flt GREENFIELD THREADING 385329
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Pipe TapStraight1 4 18Bright4 Flt GREENFIELD THREADING 387238
Pipe TapStraight1 4 18Bright4 Flt GREENFIELD THREADING 387238
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NORTH AMERICAN 17703 Extension Pipe Tap Plug 1 4 Inx18 Bright
NORTH AMERICAN 17703 Extension Pipe Tap Plug 1 4 Inx18 Bright
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Pipe TapTaper1 16 27Bright4 Flt GREENFIELD THREADING 385307
Pipe TapTaper1 16 27Bright4 Flt GREENFIELD THREADING 385307
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USED ERICKSON TOOL HAND TAP DRIVER 1 4 PIPE
USED ERICKSON TOOL HAND TAP DRIVER 1 4 PIPE
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BILZ WESR 3B 3 4 PIPE TORQUE CONTROL TAP ADAPTER STK 6167
BILZ WESR 3B 3 4 PIPE TORQUE CONTROL TAP ADAPTER STK 6167
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Macedonia 3 8 18 NPT HSS Pipe Tap
Macedonia 3 8 18 NPT HSS Pipe Tap
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Yamawa PT3 4 14 Rc3 4 14 HSSE PIPE TAP
Yamawa PT3 4 14 Rc3 4 14 HSSE PIPE TAP
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USED SCULLY JONES MT4 x 1 2 PIPE TAP SPLIT SLEEVE TAP DRIVER 01203
USED SCULLY JONES MT4 x 1 2 PIPE TAP SPLIT SLEEVE TAP DRIVER 01203
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Lot of 3 Pipe Taps 3 8 18 North American Hanson Whitney Used but sharp
Lot of 3 Pipe Taps 3 8 18 North American Hanson Whitney Used but sharp
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USED SCULLY JONES SPLIT SLEEVE TAP DRIVER MT4 x 3 8 LS PIPE TAP 01201
USED SCULLY JONES SPLIT SLEEVE TAP DRIVER MT4 x 3 8 LS PIPE TAP 01201
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new CENTAUR PRECISION TOOLS CWES 2 1 4 Pipe Torque Control Tap Adapter 201126
new CENTAUR PRECISION TOOLS CWES 2 1 4 Pipe Torque Control Tap Adapter 201126
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new CENTAUR PRECISION TOOLS CWES 2 3 8 Pipe Torque Control Tap Adapter 201376
new CENTAUR PRECISION TOOLS CWES 2 3 8 Pipe Torque Control Tap Adapter 201376
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new CENTAUR PRECISION TOOLS CWES 2 1 2 Pipe Torque Control Tap Adapter 201501
new CENTAUR PRECISION TOOLS CWES 2 1 2 Pipe Torque Control Tap Adapter 201501
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