Tap Drill

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What is the proper tap drill dia. for 1/8-28 BS pipe tap?

I'm hearing from my co-workers that it's .315" drill, but the tip of the tap measures about .330" dia.

It's .328125 (or 21/64)

Here is a very useful link:
http://www.newmantools.com/taps/bsp.htm#drills

Discover Tap Drill On eBay Below:

18 Pcs HSS Tap  Drill Set Metric in Metal Box 0001 0052
18 Pcs HSS Tap Drill Set Metric in Metal Box 0001 0052
$49.65
Tap and Drill Gage2 56 to 1 4 20 WESTWARD 2YNJ6
Tap and Drill Gage2 56 to 1 4 20 WESTWARD 2YNJ6
$40.23
Drill Master Metric Drill Tap Deburr Bit Set 13 Pc For use w steel copper brass
Drill Master Metric Drill Tap Deburr Bit Set 13 Pc For use w steel copper brass
$28.77
NEW LOT OF 12 8 36 NS H7 OVERSIZED DRILL TAP COMBO REGAL BELOIT 457
NEW LOT OF 12 8 36 NS H7 OVERSIZED DRILL TAP COMBO REGAL BELOIT 457
$20.00
NEW LOT OF 12 8 36 NS 005 OVERSIZED DRILL TAP COMBO REGAL BELOIT 462
NEW LOT OF 12 8 36 NS 005 OVERSIZED DRILL TAP COMBO REGAL BELOIT 462
$19.00
Mueller Drilling and Tapping Machine w Taps  Ratchet Handle
Mueller Drilling and Tapping Machine w Taps Ratchet Handle
$500.00
5 NEW Greenlee DTAP10 32 Drill Tap Countersink Quick Release Bit pkg
5 NEW Greenlee DTAP10 32 Drill Tap Countersink Quick Release Bit pkg
$34.90
10 NEW Greenlee DTAP6 32 Drill Tap Countersink Quick Release Bit NC pkg
10 NEW Greenlee DTAP6 32 Drill Tap Countersink Quick Release Bit NC pkg
$67.90
Drill Tap Countersink Bit1 4 20x2 1 4 L WESTWARD 6EXL5
Drill Tap Countersink Bit1 4 20x2 1 4 L WESTWARD 6EXL5
$6.52
Taper Shank CAT 40 Minimum Tap Cap M8 Max Tap Cap M20 Hole Dia 3100 NEW
Taper Shank CAT 40 Minimum Tap Cap M8 Max Tap Cap M20 Hole Dia 3100 NEW
$250.00
Hand Tap 1 1 4 7 tpi Metalworking Industrial mill drill lathe
Hand Tap 1 1 4 7 tpi Metalworking Industrial mill drill lathe
$30.00
Drill America Pou1 2Nptw Drill Pou 1 2 Carbon Steel Npt Tap And 23 32 Hss Dril
Drill America Pou1 2Nptw Drill Pou 1 2 Carbon Steel Npt Tap And 23 32 Hss Dril
$25.88
Hand Tap 1 3 8 6 nc gh4 Brubaker Metalworking Industrial mill drill lathe
Hand Tap 1 3 8 6 nc gh4 Brubaker Metalworking Industrial mill drill lathe
$35.00
MT2 2 Morse taper shank drill shank sleeve Outer circle 25mm Inner hole MT2
MT2 2 Morse taper shank drill shank sleeve Outer circle 25mm Inner hole MT2
$8.79
MT3 3 Morse taper shank drill shank sleeve Outer circle 30mm Inner hole MT3
MT3 3 Morse taper shank drill shank sleeve Outer circle 30mm Inner hole MT3
$10.89
Automatic Magnetic Drilling  Tapping Machine DX 35 35mm Drilling Machine 220V
Automatic Magnetic Drilling Tapping Machine DX 35 35mm Drilling Machine 220V
$644.50
Union Twist Drill 7 8 14 NF HSW H4B W 418 Taper Measuring 4 3 4 Long
Union Twist Drill 7 8 14 NF HSW H4B W 418 Taper Measuring 4 3 4 Long
$29.99
Union Twist Drill 5 8 18 NF HSW H3B 410 Taper Measuring 3 3 4 Long LOTUTD14
Union Twist Drill 5 8 18 NF HSW H3B 410 Taper Measuring 3 3 4 Long LOTUTD14
$29.99
Union Twist Drill 9 16 12 NC HSW H3T 349 Taper Measuring 3 5 8 Long LOTUTD17
Union Twist Drill 9 16 12 NC HSW H3T 349 Taper Measuring 3 5 8 Long LOTUTD17
$29.99
Union Twist Drill 9 16 12 NC HSW H3B 437 Taper Measuring 3 5 8 Long LOTUTD16
Union Twist Drill 9 16 12 NC HSW H3B 437 Taper Measuring 3 5 8 Long LOTUTD16
$29.99
Union Twist Drill 5 8 11 NC HSW H3B 432 Taper Measuring 3 3 4 Long LOTUTD15
Union Twist Drill 5 8 11 NC HSW H3B 432 Taper Measuring 3 3 4 Long LOTUTD15
$29.99
Union Twist Drill 7 8 9 NC HSW H4B 422 Taper Measuring 4 3 4 Long LOTUTD13
Union Twist Drill 7 8 9 NC HSW H4B 422 Taper Measuring 4 3 4 Long LOTUTD13
$34.99
Hand Tap 1 1 4 7 tpi TIN Metalworking Industrial mill drill lathe
Hand Tap 1 1 4 7 tpi TIN Metalworking Industrial mill drill lathe
$45.00
Universal 360 Angle Electric Tapping  Drilling Machine M3 M16 1100mm s
Universal 360 Angle Electric Tapping Drilling Machine M3 M16 1100mm s
$1,211.66
High Quality Vertical Type Electric Tapping  Drilling Machine M3 M12 1100mm s
High Quality Vertical Type Electric Tapping Drilling Machine M3 M12 1100mm s
$1,574.50
High Quality Vertical Type Electric Tapping  Drilling Machine M3 M16 1100mm s
High Quality Vertical Type Electric Tapping Drilling Machine M3 M16 1100mm s
$1,588.60
SET OF 4 VARIOUS SIZES DRILL TAPS
SET OF 4 VARIOUS SIZES DRILL TAPS
$2.75
SET OF 5 VARIOUS SIZES DRILL TAPS
SET OF 5 VARIOUS SIZES DRILL TAPS
$3.50
SET OF 5 VARIOUS SIZES DRILL TAPS LARGE
SET OF 5 VARIOUS SIZES DRILL TAPS LARGE
$4.50
Hand Tap 1 3 8 6 nc gh4 Brubaker Metalworking Industrial mill drill lathe
Hand Tap 1 3 8 6 nc gh4 Brubaker Metalworking Industrial mill drill lathe
$35.00
Universal 360 Angle Electric Tapping  Drilling Machine M6 M30 1200mm s
Universal 360 Angle Electric Tapping Drilling Machine M6 M30 1200mm s
$1,605.52
High Quality Vertical Type Electric Tapping  Drilling Machine M6 M24 1200mm s
High Quality Vertical Type Electric Tapping Drilling Machine M6 M24 1200mm s
$1,630.90
STARRETT Tools Machinist Decimal Equivalents Fractional TAP DRILL SIZES Card
STARRETT Tools Machinist Decimal Equivalents Fractional TAP DRILL SIZES Card
$7.67
US Stock Thread Repair Kit M3 x 05 Drill Tap Extraction Removal Tool 12 Inserts
US Stock Thread Repair Kit M3 x 05 Drill Tap Extraction Removal Tool 12 Inserts
$23.15
US Stock Thread Repair Kit M10 x 15 Drill Tap Extraction Removal Tool 12 Insert
US Stock Thread Repair Kit M10 x 15 Drill Tap Extraction Removal Tool 12 Insert
$32.51
US Stock Thread Repair Kit M14 x 2 Drill Tap Extraction Removal Tool 12 Inserts
US Stock Thread Repair Kit M14 x 2 Drill Tap Extraction Removal Tool 12 Inserts
$45.52
US Stock Thread Repair Kit M12 x 175 Drill Tap Extraction Removal Tool Inserts
US Stock Thread Repair Kit M12 x 175 Drill Tap Extraction Removal Tool Inserts
$42.09
US Stock Thread Repair Kit M5 x 08 Drill Tap Extraction Removal Tool 12 Inserts
US Stock Thread Repair Kit M5 x 08 Drill Tap Extraction Removal Tool 12 Inserts
$23.49
US Stock Thread Repair Kit M8 x 125 Drill Tap Extraction Removal Tool 12 Insert
US Stock Thread Repair Kit M8 x 125 Drill Tap Extraction Removal Tool 12 Insert
$29.09

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