We only use super high speed steel to make this drill bits.
kinds of coating available. tin, tialn .
specical design available on request.
taper shank available on request.
regular length and long length available.
STC036-1, INCH SIZE COMBINED DRILLS & COUNTERSINKS ( CENTER DRILL ) |
ANSI / ASME B94.11 M-1993 |
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PLAIN TYPE, 60° Angle, Ground |
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Size |
Body Diameter |
Drill Diameter |
Overall Length |
Pict
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0 |
1/8" |
1/32" |
1-1/8" |
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1 |
1/8" |
3/64" |
1-1/4" |
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2 |
3/16" |
5/64" |
1-7/8" |
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3 |
1/4" |
7/64" |
2" |
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4 |
5/16" |
1/8" |
2-1/8" |
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4-1/2 |
3/8" |
9/64" |
2-1/2" |
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5 |
7/16" |
3/16" |
2-3/4" |
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6 |
1/2" |
7/32" |
3" |
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7 |
5/8" |
1/4" |
3-1/4" |
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8 |
3/4" |
5/16" |
3-1/2" |
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9 |
7/8" |
11/32" |
3-5/8" |
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10 |
1" |
3/8" |
3-3/4" |
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BELL TYPE, 60° / 120° Angle, Milled / Ground |
Pict
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Size |
Body Diameter |
Drill Diameter |
Overall Length |
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11 |
1/8" |
3/64" |
1-1/4" |
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12 |
3/16" |
1/16" |
1-7/8" |
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13 |
1/4" |
3/32" |
2" |
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14 |
5/16" |
7/64" |
2-1/8" |
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15 |
7/16" |
5/32" |
2-3/4" |
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16 |
1/2" |
3/16" |
3" |
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17 |
5/8" |
7/32" |
3-1/4" |
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18 |
3/4" |
1/4" |
3-1/2" |
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19 |
7/8" |
5/16" |
3-5/8" |
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20 |
1" |
3/8" |
3-3/4" |
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STC037, INCH SIZE COMBINED DRILLS & COUNTERSINKS, Long Series |
PLAIN TYPE. |
Size |
Body Diameter |
Drill Diameter |
Overall Length |
60° Angle |
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1A |
1/8" |
3/64" |
3" |
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1B |
1/8" |
3/64" |
4" |
Pict
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1C |
1/8" |
3/64" |
5" |
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1D |
1/8" |
3/64" |
6" |
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2A |
3/16" |
5/64" |
3" |
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2B |
3/16" |
5/64" |
4" |
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2C |
3/16" |
5/64" |
5" |
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2D |
3/16" |
5/64" |
6" |
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3A |
1/4" |
7/64" |
3" |
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3B |
1/4" |
7/64" |
4" |
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3C |
1/4" |
7/64" |
5" |
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3D |
1/4" |
7/64" |
6" |
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4A |
5/16" |
1/8" |
3" |
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4B |
5/16" |
1/8" |
4" |
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4C |
5/16" |
1/8" |
5" |
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4D |
5/16" |
1/8" |
6" |
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5B |
7/16" |
3/16" |
4" |
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5C |
7/16" |
3/16" |
5" |
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5D |
7/16" |
3/16" |
6" |
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6B |
1/2" |
7/32" |
4" |
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6C |
1/2" |
7/32" |
5" |
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6D |
1/2" |
7/32" |
6" |
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7 |
5/8" |
1/4" |
6" |
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8 |
3/4" |
5/16" |
6" |