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Taper Length Drill Bit Chart

Taper Length Drills are designed for general purpose drilling where a length longer than Jobber Length is required. 

They come in a wide range of sizes, finishes and materials such as High Speed Steel, Cobalt and Carbide Tipped.

Taper length drill bits' flute length and overall length are dependant on the diamater of the drill bit. See the chart below for these specifications.

 

Fractional Sizes Decimal Equivalent (Inches) Flute Length (Inches) Overall Length (Inches)
1/64” 0.0156 5/16” 1-1/2”
1/32” 0.0312 3/4” 2”
3/64” 0.0469 1-1/8” 2-1/4”
1/16” 0.0625 1-3/4” 3”
5/64” 0.0781 2” 3-3/4”
3/32” 0.0938 2-1/4” 4-1/4”
7/64” 0.1094 2-1/2” 4-5/8”
1/8” 0.125 2-3/4” 5-1/8”
9/64” 0.1406 3” 5-3/8”
5/32” 0.1562 3” 5-3/8”
11/64” 0.1719 3-3/8” 5-3/4”
3/16” 0.1875 3-3/8” 5-3/4”
13/64” 0.2031 3-5/8” 6”
7/32” 0.2188 3-5/8” 6”
15/64” 0.2344 3-3/4” 6-1/8”
1/4” 0.25 3-3/4” 6-1/8”
17/64” 0.2656 3-7/8” 6-1/4”
9/32” 0.2812 3-7/8” 6-1/4”
19/64” 0.2969 4” 6-3/8”
5/16” 0.3125 4” 6-3/8”
21/64” 0.3281 4-1/8” 6-1/2”
11/32” 0.3438 4-1/8” 6-1/2”
23/64” 0.3594 4-1/4” 6-3/4”
3/8” 0.375 4-1/4” 6-3/4”
25/64” 0.3906 4-3/8” 7”
13/32” 0.4062 4-3/8” 7”
27/64” 0.4219 4-5/8” 7-1/4”
7/16” 0.4375 4-5/8” 7-1/4”
29/64” 0.4531 4-3/4” 7-1/2”
15/32” 0.4688 4-3/4” 7-1/2”
31/64” 0.4844 4-3/4” 7-3/4”
1/2” 0.5 4-3/4” 7-3/4”
33/64” 0.5156 4-3/4” 8”
17/32” 0.5312 4-3/4” 8”
35/64” 0.5469 4-7/8” 8-1/4”
9/16” 0.5625 4-7/8” 8-1/4”
37/64” 0.5781 4-7/8” 8-3/4”
19/32” 0.5938 4-7/8” 8-3/4”
39/64” 0.6094 4-7/8” 8-3/4”
5/8” 0.625 4-7/8” 8-3/4”
41/64” 0.6406 5-1/8” 9”
21/32” 0.6562 5-3/8” 9”
43/64” 0.6719 5-3/8” 9-1/4”
11/16” 0.6875 5-3/8” 9-1/4”
45/64” 0.7031 5-5/8” 9-1/2”
23/32” 0.7188 5-5/8” 9-1/2”
47/64” 0.7344 5-7/8” 9-3/4”
3/4” 0.75 5-7/8” 9-3/4”
49/64” 0.7656 6” 9-7/8”
25/32” 0.7812 6” 9-7/8”
51/64” 0.7969 6-1/8” 10”
13/16” 0.8125 6-1/8” 10”
53/64” 0.8281 6-1/8” 10”
27/32” 0.8438 6-1/8” 10”
55/64” 0.8594 6-1/8” 10”
7/8” 0.875 6-1/8” 10”
57/64” 0.8906 6-1/8” 10”
29/32” 0.9062 6-1/8” 10”
59/64” 0.9219 6-1/8” 10-3/4”
15/16” 0.9375 6-1/8” 10-3/4”
61/64” 0.9531 6-3/8” 11”
31/32” 0.9688 6-3/8” 11”
63/64” 0.9844 6-3/8” 11”
1” 1 6-3/8” 11”
1-1/8” 1.125 7-1/8” 11-3/4”
1-1/4” 1.25 7-7/8” 12-1/2”
1-3/8” 1.375 8-7/8” 14-1/2”
1-1/2” 1.5 9-3/8” 15”
       
       
Wire Sizes Decimal Equivalent (Inches) Flute Length (Inches) Overall Length (Inches)
1 0.228 3-3/4” 6-1/8”
2 0.221 3-5/8” 6”
3 0.213 3-5/8” 6”
4 0.209 3-5/8” 6”
5 0.2055 3-5/8” 6”
6 0.204 3-5/8” 6”
7 0.201 3-5/8” 6”
8 0.199 3-5/8” 6”
9 0.196 3-5/8” 6”
10 0.1935 3-5/8” 6”
11 0.191 3-5/8” 6”
12 0.189 3-5/8” 6”
13 0.185 3-3/8” 5-3/4”
14 0.182 3-3/8” 5-3/4”
15 0.18 3-3/8” 5-3/4”
16 0.177 3-3/8” 5-3/4”
17 0.173 3-3/8” 5-3/4”
18 0.1695 3-3/8” 5-3/4”
19 0.166 3-3/8” 5-3/4”
20 0.161 3-3/8” 5-3/4”
21 0.159 3-3/8” 5-3/4”
22 0.157 3-3/8” 5-3/4”
23 0.154 3” 5-3/8”
24 0.152 3” 5-3/8”
25 0.1495 3” 5-3/8”
26 0.147 3” 5-3/8”
27 0.144 3” 5-3/8”
28 0.1405 3” 5-3/8”
29 0.136 3” 5-3/8”
30 0.1285 3” 5-3/8”
31 0.12 2-3/4” 5-1/8”
32 0.116 2-3/4” 5-1/8”
33 0.113 2-3/4” 5-1/8”
34 0.111 2-3/4” 5-1/8”
35 0.11 2-3/4” 5-1/8”
36 0.1065 2-1/2” 4-5/8”
37 0.104 2-1/2” 4-5/8”
38 0.1015 2-1/2” 4-5/8”
39 0.0995 2-1/2” 4-5/8”
40 0.098 2-1/2” 4-5/8”
41 0.096 2-1/2” 4-5/8”
42 0.0935 2-1/4” 4-1/4”
43 0.089 2-1/4” 4-1/4”
44 0.086 2-1/4” 4-1/4”
45 0.082 2-1/4” 4-1/4”
46 0.081 2-1/4” 4-1/4”
47 0.0785 2-1/4” 4-1/4”
48 0.076 2” 3-3/4”
49 0.073 2” 3-3/4”
50 0.07 2” 3-3/4”
51 0.067 2” 3-3/4”
52 0.0635 2” 3-3/4”
53 0.0595 1-3/4” 3”
54 0.055 1-3/4” 3”
55 0.052 1-3/4” 3”
56 0.0465 1-1/8” 2-1/4”
57 0.043 1-1/8” 2-1/4”
58 0.042 1-1/8” 2-1/4”
59 0.041 1-1/8” 2-1/4”
60 0.04 1-1/8” 2-1/4”
43      
61 0.039 1-1/8” 2-1/4”
62 0.038 3/4” 2”
63 0.037 3/4” 2”
64 0.036 3/4” 2”
65 0.035 3/4” 2”
66 0.033 3/4” 2”
67 0.032 3/4” 2”
68 0.031 3/4” 2”
69 0.0292 3/4” 2”
70 0.028 3/4” 2”
71 0.026 3/4” 2”
72 0.025 5/16” 1-1/2”
73 0.024 5/16” 1-1/2”
74 0.0225 5/16” 1-1/2”
75 0.021 5/16” 1-1/2”
76 0.02 5/16” 1-1/2”
77 0.018 5/16” 1-1/2”
78 0.016 5/16” 1-1/2”
79 0.0145 5/16” 1-1/2”
80 0.0135 5/16” 1-1/2”