Drill Bit Length Chart

Reference Only. Not for design.

SizeDiameterOA Length (Screw Machine)Flute Length (Screw Machine)OA Length (Jobber)Flute Length (Jobber)OA Length (Taper)Flute Length (Taper)
1|640.0156NANA0.750.18751.50.3125
800.0135NANA0.750.1251.50.3125
790.0145NANA0.750.1251.50.3125
780.016NANA0.8750.18751.50.3125
770.018NANA0.8750.18751.50.3125
760.02NANA0.8750.18751.50.3125
750.021NANA10.251.50.3125
740.0225NANA10.251.50.3125
730.024NANA1.1250.31251.50.3125
720.025NANA1.1250.31251.50.3125
710.026NANA1.250.37520.75
700.028NANA1.250.37520.75
690.0292NANA1.3750.520.75
680.031NANA1.3750.520.75
1|320.03121.3750.51.3750.520.75
670.032NANA1.3750.520.75
660.033NANA1.3750.520.75
650.035NANA1.50.62520.75
640.036NANA1.50.62520.75
630.037NANA1.50.62520.75
620.038NANA1.50.62520.75
610.039NANA1.6250.68752.251.125
600.041.3750.51.6250.68752.251.125
590.0411.3750.51.6250.68752.251.125
580.0421.3750.51.6250.68752.251.125
570.0431.3750.51.750.752.251.125
560.04651.3750.51.750.752.251.125
3|640.04691.3750.51.750.752.251.125
550.0521.6250.6251.8750.87531.75
540.0551.6250.6251.8750.87531.75
530.05951.6250.6251.8750.87531.75
1|160.06251.6250.6251.8750.87531.75
520.06351.68750.68751.8750.8753.752
510.0671.68750.6875213.752
500.071.68750.6875213.752
490.0731.68750.6875213.752
480.0761.68750.6875213.752
5|640.07811.68750.6875213.752
470.07851.750.75214.252.25
460.0811.750.752.1251.1254.252.25
450.0821.750.752.1251.1254.252.25
440.0861.750.752.1251.1254.252.25
430.0891.750.752.251.254.252.25
420.09351.750.752.251.254.252.25
3|320.09381.750.752.251.254.252.25
410.0961.81250.81252.3751.3754.6252.5
400.0981.81250.81252.3751.3754.6252.5
390.09951.81250.81252.3751.3754.6252.5
380.10151.81250.81252.51.43754.6252.5
370.1041.81250.81252.51.43754.6252.5
360.10651.81250.81252.51.43754.6252.5
7|640.10941.81250.81252.6251.54.6252.5
350.111.8750.8752.6251.55.1252.75
340.1111.8750.8752.6251.55.1252.75
330.1131.8750.8752.6251.55.1252.75
320.1161.8750.8752.751.6255.1252.75
310.121.8750.8752.751.6255.1252.75
1|80.1251.8750.8752.751.6255.1252.75
300.12851.93750.93752.751.6255.3753
290.1361.93750.93752.8751.755.3753
280.14051.93750.93752.8751.755.3753
9|640.14061.93750.93752.8751.755.3753
270.1442.0625131.8755.3753
260.1472.0625131.8755.3753
250.14952.0625131.8755.3753
240.1522.062513.12525.3753
230.1542.062513.12525.3753
5|320.15622.062513.12525.3753
220.1572.1251.06253.12525.753.375
210.1592.1251.06253.252.1255.753.375
200.1612.1251.06253.252.1255.753.375
190.1662.1251.06253.252.1255.753.375
180.16952.1251.06253.252.1255.753.375
11|640.17192.1251.06253.252.1255.753.375
170.1732.18751.1253.3752.18755.753.375
160.1772.18751.1253.3752.18755.753.375
150.182.18751.1253.3752.18755.753.375
140.1822.18751.1253.3752.18755.753.375
130.1852.18751.1253.52.31255.753.375
3|160.18752.18751.1253.52.31255.753.375
120.1892.251.18753.52.312563.625
110.1912.251.18753.52.312563.625
100.19352.251.18753.6252.437563.625
90.1962.251.18753.6252.437563.625
80.1992.251.18753.6252.437563.625
70.2012.251.18753.6252.437563.625
13|640.20312.251.18753.6252.437563.625
60.2042.3751.253.752.563.625
50.20552.3751.253.752.563.625
40.2092.3751.253.752.563.625
30.2132.3751.253.752.563.625
7|320.21882.3751.253.752.563.625
20.2212.43751.31253.8752.6256.1253.75
10.2282.43751.31253.8752.6256.1253.75
A0.2342.43751.31253.8752.6256.1253.75
15|640.23442.43751.31253.8752.6256.1253.75
B0.2382.51.37542.756.1253.75
C0.2422.51.37542.756.1253.75
D0.2462.51.37542.756.1253.75
1|4-E0.252.51.37542.756.1253.75
F0.2572.6251.43754.1252.8756.1253.75
G0.2612.6251.43754.1252.8756.1253.75
17|640.26562.6251.43754.1252.8756.253.875
H0.2662.68751.54.1252.8756.253.875
I0.2722.68751.54.1252.8756.253.875
J0.2772.68751.54.1252.8756.253.875
9|320.28122.68751.54.252.93756.253.875
K0.28122.68751.54.252.93756.253.875
L0.292.751.56254.252.93756.253.875
M0.2952.751.56254.3753.06256.3754
19|640.29692.751.56254.3753.06256.3754
N0.3022.81251.6254.3753.06256.3754
5|160.31252.81251.6254.53.18756.3754
O0.3162.93751.68754.53.18756.3754
P0.3232.93751.68754.6253.31256.3754
21|640.32812.93751.68754.6253.31256.54.125
Q0.33231.68754.753.43756.54.125
R0.33931.68754.753.43756.54.125
11|320.343831.68754.753.43756.54.125
S0.3483.06251.754.8753.56.754.25
T0.3583.06251.754.8753.56.754.25
23|640.35943.06251.754.8753.56.754.25
U0.3683.1251.812553.6256.754.25
3|80.3753.1251.812553.6256.754.25
V0.3773.251.87553.6256.754.25
W0.3863.251.8755.1253.756.754.25
25|640.39063.251.8755.1253.7574.375
X0.3973.31251.93755.1253.7574.375
Y0.4043.31251.93755.253.87574.375
13|320.40623.31251.93755.253.87574.375
Z0.4133.37525.253.8757.254.625
27|640.42193.37525.3753.93757.254.625
7|160.43753.43752.06255.54.06257.254.625
29|640.45313.56252.1255.6254.18757.54.75
15|320.46883.6252.1255.754.31257.54.75
31|640.48443.68752.18755.8754.3757.754.75
1|20.53.752.2564.57.754.75
33|640.51563.8752.3756.6254.812584.75
17|320.53123.8752.3756.6254.812584.75
35|640.546942.56.6254.81258.254.875
9|160.562542.56.6254.81258.254.875
37|640.57814.1252.6256.6254.81258.754.875
19|320.59384.1252.6257.1255.18758.754.875
39|640.60944.252.757.1255.18758.754.875
5|80.6254.252.757.1255.18758.754.875
41|640.64064.52.8757.1255.187595.125
21|320.65624.52.8757.1255.187595.125
43|640.67194.6252.8757.6255.6259.255.375
11|160.68754.6252.8757.6255.6259.255.375
45|640.70314.753NANA9.55.625
23|320.71884.753NANA9.55.625
47|640.734453.125NANA9.755.875
3|40.7553.125NANA9.755.875
49|640.76565.1253.25NANA9.8756
25|320.78125.1253.25NANA9.8756
51|640.79695.253.375NANA106.125
13|160.81255.253.375NANA106.125
53|640.82815.3753.5NANA106.125
27|320.84385.3753.5NANA106.125
55|640.85945.53.5NANA106.125
7|80.8755.53.5NANA106.125
57|640.89065.6253.625NANA106.125
29|320.90625.6253.625NANA106.125
59|640.92195.753.75NANA10.756.125
15|160.93755.753.75NANA10.756.125
61|640.95315.8753.875NANA116.375
31|320.96885.8753.875NANA116.375
63|640.984464NANA116.375
1164NANA116.375