SizeDiameterFlute Length
inch
Overall Length
inch
U.S.MetricinchMM
1.000.03941.001/21 3/8
600.04001.0161/21 3/8
590.04101.0411/21 3/8
1.050.04131.0501/21 3/8
580.04201.0671/21 3/8
570.04301.0921/21 3/8
1.100.04331.1001/21 3/8
1.150.04531.1501/21 3/8
560.04651.1811/21 3/8
3/640.04691.1911/21 3/8
1.200.04721.2005/81 5/8
1.250.04921.2505/81 5/8
1.300.05121.3005/81 5/8
550.05201.3215/81 5/8
1.350.05311.3505/81 5/8
540.05501.3975/81 5/8
1.400.05511.4005/81 5/8
1.450.05711.4505/81 5/8
1.500.05911.5005/81 5/8
530.05951.5115/81 5/8
1.550.06101.5505/81 5/8
1/160.06251.5885/81 5/8
1.600.06301.60011/161 11/16
520.06351.61311/161 11/16
1.650.06501.65011/161 11/16
1.700.06691.70011/161 11/16
510.06701.70211/161 11/16
1.750.06891.75011/161 11/16
500.07001.77811/161 11/16
1.800.07091.80011/161 11/16
1.850.07281.85011/161 11/16
490.07301.85411/161 11/16
1.900.07481.90011/161 11/16
480.07601.93011/161 11/16
1.950.07681.95011/161 11/16
5/640.07811.98411/161 11/16
470.07851.99411/161 11/16
2.000.07872.00011/161 11/16
2.050.08072.0503/41 3/4
460.08102.0573/41 3/4
450.08202.0833/41 3/4
2.100.08272.1003/41 3/4
2.150.08462.1503/41 3/4
440.08602.1843/41 3/4
2.200.08662.2003/41 3/4
2.250.08862.2503/41 3/4
430.08902.2613/41 3/4
2.300.09062.3003/41 3/4
2.350.09252.3503/41 3/4
420.09352.3753/41 3/4
3/320.09382.3833/41 3/4
2.400.09452 1/213/161 13/16
410.09602.43813/161 13/16
2.450.09652.45013/161 13/16
400.09802.48913/161 13/16
2.500.09842.50013/161 13/16
390.09952.52713/161 13/16
380.10152.57813/161 13/16
2.600.10242.60013/161 13/16
370.10402.64213/161 13/16
2.700.10632.70013/161 13/16
360.10652.70513/161 13/16
7/640.10942.77913/161 13/16
350.11002.7947/81 7/8
2.800.11022.8007/81 7/8
340.11102.8197/81 7/8
330.11302.8707/81 7/8
2.900.11422.9007/81 7/8
320.11602.9467/81 7/8
3.000.11813.0007/81 7/8
310.12003.0487/81 7/8
3.100.12203.1007/81 7/8
1/80.12503.01757/81 7/8
3.200.12603.20015/161 15/16
300.12853.26415/161 15/16
3.300.12993.30015/161 15/16
3.400.13393.40015/165 3/81 15/16
290.13603.45415/161 15/16
3.500.13783.50015/161 15/16
280.14053.56915/161 15/16
9/640.14063.57115/161 15/16
3.600.14173.60012 1/16
270.14403.65812 1/16
3.700.14573.70012 1/16
260.14703.73412 1/16
250.14953.79712 1/16
3.800.14963.80012 1/16
240.15203.86112 1/16
3.900.15353.90012 1/16
230.15403.91212 1/16
5/320.15623.96712 1/16
220.15703.9881 1/162 1/8
4.000.15754.0001 1/162 1/8
210.15904.0391 1/162 1/8
200.16104.0891 1/162 1/8
4.100.16144.1001 1/162 1/8
4.200.16544.2001 1/162 1/8
190.16604.2161 1/162 1/8
4.300.16934.3001 1/162 1/8
180.16954.3051 1/162 1/8
11/640.17194.3661 1/162 1/8
170.17304.3941 1/82 3/16
4.400.17324.4001 1/82 3/16
160.17704.4961 1/82 3/16
4.500.17724.5001 1/82 3/16
150.18004.5721 1/82 3/16
4.600.18114.6001 1/82 3/16
140.18204.6231 1/82 3/16
134.700.18504.7001 1/82 3/16
3/160.18754.7621 1/82 3/16
124.800.18904.8001 3/162 1/4
110.19104.8511 3/162 1/4
4.900.19294.9001 3/162 1/4
100.19354.9151 3/162 1/4
90.19604.9781 3/162 1/4
5.000.19695.0001 3/162 1/4
80.19905.0541 3/162 1/4
5.100.20085.1001 3/162 1/4
70.20105.1051 3/162 1/4
13/640.20315.1591 3/162 1/4
60.20405.1821 1/42 3/8
5.200.20475.2001 1/42 3/8
50.20555.2201 1/42 3/8
5.300.20875.3001 1/42 3/8
40.20905.3091 1/42 3/8
5.400.21265.4001 1/42 3/8
30.21305.4101 1/42 3/8
5.500.21655.5001 1/42 3/8
7/320.21885.5581 1/42 3/8
5.600.22055.6001 5/162 7/16
20.22105.6131 5/162 7/16
5.700.22445.7001 5/162 7/16
10.22805.7911 5/162 7/16
5.800.22835.8001 5/162 7/16
5.900.23235.6001 5/162 7/16
A0.23405.9441 5/162 7/16
15/640.23445.9541 5/162 7/16
6.000.23626.0001 3/82 1/2
B0.23806.0451 3/82 1/2
6.100.24026.1001 3/82 1/2
C0.24206.1471 3/82 1/2
6.200.24416.2001 3/82 1/2
D0.24606.2481 3/82 1/2
6.300.24806.3001 3/82 1/2
E, 1/40.25006.3501 3/82 1/2
6.400.25206.4001 7/162 5/8
6.500.25596.5001 7/162 5/8
F0.25706.5281 7/162 5/8
6.600.25986.6001 7/162 5/8
G0.26106.6291 7/162 5/8
6.700.26386.7001 7/162 5/8
17/640.26566.7461 7/162 5/8
H0.26606.7561 1/22 11/16
6.800.26776.8001 1/22 11/16
6.900.27176.9001 1/22 11/16
I0.27206.9091 1/22 11/16
7.000.27567.0001 1/22 11/16
J0.27707.0361 1/22 11/16
7.100.27957.1001 1/22 11/16
K0.28107.1371 1/22 11/16
9/320.28127.1421 1/22 11/16
7.200.28357.2001 9/162 3/4
7.300.28747.3001 9/162 3/4
L0.29007.3661 9/162 3/4
7.400.29137.4001 9/162 3/4
M0.29507.4931 9/162 3/4
7.500.29537.5001 9/162 3/4
19/640.29697.5411 9/162 3/4
7.600.29927.6001 5/82 13/16
N0.30207.6711 5/82 13/16
7.700.30317.7001 5/82 13/16
7.800.30717.8001 5/82 13/16
7.900.31107.9001 5/82 13/16
5/160.31257.9381 5/82 13/16
8.000.31508.0001 11/16>/td>2 15/16
O0.31608.0261 11/162 15/16
8.100.31898.1001 11/162 15/16
8.200.32288.2001 11/162 15/16
P0.32308.2041 11/162 15/16
8.300.32688.3001 11/162 15/16
21/640.32818.3341 11/162 15/16
8.400.33078.4001 11/163
Q0.33208.4331 11/163
8.500.33468.5001 11/163
8.600.33868.6001 11/163
R0.33908.6111 11/163
8.700.34258.7001 11/163
11/320.34388.7331 11/163
8.800.34658.8001 3/43 1/16
S0.34808.8391 3/43 1/16
8.900.35048.9001 3/43 1/16
9.000.35439.0001 3/41/16
T0.35809.0931 3/43 1/16
9.100.35839.1001 3/43 1/16
23/640.35949.1291 3/43 1/16
9.200.36229.2001 13/163 1/8
9.300.36619.3001 13/163 1/8
U0.36809.3471 13/163 1/8
9.400.37019.4001 13/163 1/8
9.500.37409.5001 13/163 1/8
3/80.37509.5251 13/163 1/8
V0.37709.5761 7/83 1/4
9.600.37809.6001 7/83 1/4
9.700.38199.7001 7/83 1/4
9.800.38589.8001 7/83 1/4
W0.38609.8041 7/83 1/4
9.900.38989.9001 7/83 1/4
25/640.39069.9211 7/83 1/4
10.000.393710.001 15/163 5/16
X0.397010.0841 15/163 5/16
10.200.401610.2001 15/163 5/16
Y0.404010.2621 15/163 5/16
13/320.406210.3171 15/163 5/16
Z0.413010.49023 3/8
10.500.413410.50023 3/8
27/640.421910.71623 3/8
10.800.425210.8002 1/163 7/16
11.000.433111.0002 1/163 7/16
7/160.437511.1122 1/163 7/16
11.200.440911.2002 1/83 9/16
11.500.452811.5002 1/83 9/16
29/640.453111.5092 1/83 9/16
11.800.464611.8002 1/83 5/8
15/320.468811.9082 1/83 5/8
12.000.472412.0002 3/163 11/16
12.200.480312.2002 3/163 11/16
31/640.484412.3042 3/163 11/16
12.500.492112.5002 1/43 3/4
1/20.50012.7002 1/43 3/4

WHY DO MY TOOLS WEAR QUICKLY OR BREAK?

Note that excessive tool wear or breakage is often caused by one of the following:

  • Improper surface speeds
  • Improper feed rates
  • Improper cutting tool type or material (HSS vs TiN vs Carbide, etc.)
  • Dull tooling
  • Hard spots in the material such as scale, silica, etc.
  • Improper coolant or lubricant type
  • Inadequate coolant or lubricant (overall for chip removal, rubbing, etc.)
  • Inadequate coolant or lubricant (at the tip of the tooling)
  • The tool is not rigid enough (try drill bushings or guides, guide rods on the drilling machine, etc.)
  • Too deep of a cut without proper chip removal – Chip packing (try peck drilling, air blast or coolant through the tool options, etc.)
  • Tools that were manufactured or sharpened incorrectly. (watch those clearance, rake and lip angles as well as rough surfaces, etc.)

CALCULATING CYCLE TIME WHEN DRILLING:

We can help you lower your cycle time when drilling holes in a part or multiple parts. Generally, this is the calculation we use to figure out the time it will take to perform a process:

DEPTH divided by FEED = ROTATIONS.
ROTATIONS divided by RPM = MINUTES.
MINUTES multiplied by 60 = SECONDS it takes for the process.

(DEPTH = 30% of the diameter of the tool plus the thickness of the material)
Add in stroke up to product time
Add in stroke back to home time
Add in clamp and unclamp time
Add in any human factors, etc.
Add in time for potentially dull tooling, etc.
Add in time for less than adequate machine thrust, etc.

We use the following charts to estimate these numbers:

Recommended Tool Speed Chart