Cleveland Twist

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what is a starting tap? used at a steel mill 8/32 cleveland twist?

A starting tap properly called a taper tap is a tap where the front is tapered so it fits down the drilled hole so it can be started easily. It is possible to start tapping with any tap if you have the right setup but if you are tapping by hand it is much easier to use a taper tap. If you are taping a blind hole you need to first tap with the taper. Then tap again with plug tap which has less of a taper on the end. Then use a bottoming tap which has almost no taper.

I think 8/32 means a #8 machine screw with 32 thread per inch. Cleveland Twist is a company that make drills and stuff.

To get the tap dril size (hole size) you need to find the major diameter of the thread and subtract the pitch.

The formula for machine screw size is # x 0.013 + 0.06. So a #8 is 0.164". So you then subtract the pitch which is 1/threads per inch. So the tap drill size is 0.1328. If you look it up on a drill chart you will find that the closest size is #29 drill.

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The Cleveland Twist Drill Co No247 Holder For Double End End Mill
The Cleveland Twist Drill Co No247 Holder For Double End End Mill
$25.00
Cleveland Twist Drill Chasers 3 8 24 Qty 4
Cleveland Twist Drill Chasers 3 8 24 Qty 4
$25.00
Cleveland Twist Taper Shank Arbors For Expansion Shell Reamers 1 11 16 1 13 16
Cleveland Twist Taper Shank Arbors For Expansion Shell Reamers 1 11 16 1 13 16
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Cleveland Twist Arbors For Expansion Shell Reamers 2 1 16 To 2 3 16 USA
Cleveland Twist Arbors For Expansion Shell Reamers 2 1 16 To 2 3 16 USA
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H  G CLEVELAND TWIST DRILL 100 SERIES 1 1 16 18 UNEF THREAD CHASER SETsj
H G CLEVELAND TWIST DRILL 100 SERIES 1 1 16 18 UNEF THREAD CHASER SETsj
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Cleveland Twist 2 13 16 Adjustable Shell Reamer Carbide Tipped USA Made
Cleveland Twist 2 13 16 Adjustable Shell Reamer Carbide Tipped USA Made
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H  G CLEVELAND TWIST DRILL 00 SERIES 15 32 32 UNEF THREAD CHASER SETsj
H G CLEVELAND TWIST DRILL 00 SERIES 15 32 32 UNEF THREAD CHASER SETsj
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Cleveland Twist Drill HS Drill 7 8 High Helix 3 T SHK 260481 2 0
Cleveland Twist Drill HS Drill 7 8 High Helix 3 T SHK 260481 2 0
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Cleveland Twist 1 9 16 Adjustable Chucking Reamer Carbide Tipped USA Made
Cleveland Twist 1 9 16 Adjustable Chucking Reamer Carbide Tipped USA Made
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Cleveland Twist Drill 3 8
Cleveland Twist Drill 3 8
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Cleveland Twist Taper Shank Arbor Peerless Expansion Shell Reamer Size 7B
Cleveland Twist Taper Shank Arbor Peerless Expansion Shell Reamer Size 7B
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Cleveland Twist 1 5 8 Adjustable Shell Reamer Carbide Tipped USA
Cleveland Twist 1 5 8 Adjustable Shell Reamer Carbide Tipped USA
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16mm Cleveland Twist C01319 16 mm Jobber Length Black Oxide HSS Drill Bit CTD
16mm Cleveland Twist C01319 16 mm Jobber Length Black Oxide HSS Drill Bit CTD
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NEW CLEVELAND TWIST DRILL EDP 53020 FITTED SOCKET FOR SHANK TAPER DRILL 4 3
NEW CLEVELAND TWIST DRILL EDP 53020 FITTED SOCKET FOR SHANK TAPER DRILL 4 3
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Cleveland Twist 1 5 16 Chucking Reamer Carbide Tipped Spiral Flute USA Made
Cleveland Twist 1 5 16 Chucking Reamer Carbide Tipped Spiral Flute USA Made
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Cleveland Twist 1 5 16 Chucking Reamer Carbide Tipped LH Sprial RH Cut USA Made
Cleveland Twist 1 5 16 Chucking Reamer Carbide Tipped LH Sprial RH Cut USA Made
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Cleveland Twist 1 7 16 Chucking Reamer Taper Shank Carbide Tipped Spiral USA
Cleveland Twist 1 7 16 Chucking Reamer Taper Shank Carbide Tipped Spiral USA
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Cleveland Twist 1 7 16 Chucking Reamer Carbide Tipped LH Spiral USA
Cleveland Twist 1 7 16 Chucking Reamer Carbide Tipped LH Spiral USA
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Cleveland Twist Drill 1 in Drill Inv28124
Cleveland Twist Drill 1 in Drill Inv28124
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Cleveland Twist C41630 Center Cutting End Mill 3 475X3 475
Cleveland Twist C41630 Center Cutting End Mill 3 475X3 475
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CLEVELAND TWIST DRILL CO 5 8 X 5 32 X 1 2 HS SIDE MILL 505
CLEVELAND TWIST DRILL CO 5 8 X 5 32 X 1 2 HS SIDE MILL 505
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Cleveland Twist Drill Center Cutting Double End Mill 3 8 HS USA
Cleveland Twist Drill Center Cutting Double End Mill 3 8 HS USA
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Cleveland Twist Drill HSS X Lng Drill Bit 5 Dia 2MT Shank 19 Fl Lgth D37910 1
Cleveland Twist Drill HSS X Lng Drill Bit 5 Dia 2MT Shank 19 Fl Lgth D37910 1
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Cleveland Twist 1 1 2 Chucking Reamer Carbide Tipped LH Spiral RH Cut USA Made
Cleveland Twist 1 1 2 Chucking Reamer Carbide Tipped LH Spiral RH Cut USA Made
$45.00
USED CLEVELAND USA 35 64 STRAIGHT SHANK STUB LENGTH COOLANT TWIST DRILL 5469
USED CLEVELAND USA 35 64 STRAIGHT SHANK STUB LENGTH COOLANT TWIST DRILL 5469
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Cleveland Twist Drill 682 5060 0468 15 32 Double End Mill 4 Flutes
Cleveland Twist Drill 682 5060 0468 15 32 Double End Mill 4 Flutes
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Nice Cleveland Twist Drill Co Usa No A2390 1 1 8 10 Flute Expansion Reamer
Nice Cleveland Twist Drill Co Usa No A2390 1 1 8 10 Flute Expansion Reamer
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27 32 Straight Shank Cleveland Twist Drill 27 32 New USA
27 32 Straight Shank Cleveland Twist Drill 27 32 New USA
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Cleveland Twist Drill 17 32 Coolant Drill C13600 Morse taper shank
Cleveland Twist Drill 17 32 Coolant Drill C13600 Morse taper shank
$85.00
12 Cleveland twist drill stove burner type number 37 drill HSS nos machine shop
12 Cleveland twist drill stove burner type number 37 drill HSS nos machine shop
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14 CLEVELAND TWIST HS DRILL BIT PACK OF 12 NOS MADE IN USA
14 CLEVELAND TWIST HS DRILL BIT PACK OF 12 NOS MADE IN USA
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4 MORSE TAPER LATHE CENTER CLEVELAND TWIST DRILL CO
4 MORSE TAPER LATHE CENTER CLEVELAND TWIST DRILL CO
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Cleveland Twist Drill 6 9 46 Bit 2510 Lot Of 2
Cleveland Twist Drill 6 9 46 Bit 2510 Lot Of 2
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Cleveland Twist Drill HS C BORE 1 7 32 292856 1 NEW
Cleveland Twist Drill HS C BORE 1 7 32 292856 1 NEW
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6PC HSS EXTRA LENGTH TWIST DRILLS 15 64 TO 17 32 MORSE CLEVELAND RAPIDKUT
6PC HSS EXTRA LENGTH TWIST DRILLS 15 64 TO 17 32 MORSE CLEVELAND RAPIDKUT
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End Mill Flute Lot WENDT SONIE PUTNAM TOOL THE CLEVELAND TWIST DRILL COMPANY
End Mill Flute Lot WENDT SONIE PUTNAM TOOL THE CLEVELAND TWIST DRILL COMPANY
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CLEVELAND MO MAX CUT OFF BLADES 1 8 x 1 x 6 1 2 HSS C44719 Twist Drill
CLEVELAND MO MAX CUT OFF BLADES 1 8 x 1 x 6 1 2 HSS C44719 Twist Drill
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NICE CLEVELAND 4PC MACHINE LENGTH TWIST DRILLS 57 64 X 3
NICE CLEVELAND 4PC MACHINE LENGTH TWIST DRILLS 57 64 X 3
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Cleveland Twist 1 HSS 3 Flute Center Cutting Endmill
Cleveland Twist 1 HSS 3 Flute Center Cutting Endmill
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