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Screw Machine Drill Bit Specs Chart

Screw machine drills, also known as stub drills, are essential tools in the automotive and construction industries. Their unique design, where the flute length and overall length are dependent on the diameter of the drill bit, allows them to excel in screw machine setups where spindle clearance is limited. Understanding the specifications of these drills can be a complex task, but at BestBitsFor.com, we’ve simplified it with our Screw Machine Drill Bit Chart.

Our chart displays the critical specifications of screw machine drill bits, detailing the relationship between the diameter, flute length, and overall length. This comprehensive guide assists professionals and hobbyists alike in selecting the right bit for their particular application. Whether you’re working on a car engine or a construction project, our chart provides the insights needed to choose the perfect tool for the job.

The Screw Machine Drill Bit Chart is not just a list of numbers; it’s a valuable resource designed with precision and practicality in mind. It reflects our commitment to supporting the industries that rely on these specialized drill bits. The chart is designed to be user-friendly, allowing quick reference and aiding in decision-making processes.

At BestBitsFor.com, we recognize the vital role that screw machine drills play in various fields. Our Screw Machine Drill Bit Chart is crafted with the expertise and understanding of the unique requirements of these industries. Bookmark this page or download the chart for your future reference. Let it guide you in your work, enhancing efficiency, accuracy, and confidence in every drill.

Fractional Sizes Decimal Equivalent (Inches) Flute Length (Inches) Overall Length (Inches)
3/64” 0.0469 1/2” 1-3/8”
1/16” 0.0625 5/8” 1-5/8”
5/64” 0.0781 11/16” 1-11/16”
3/32” 0.0938 3/4” 1-3/4”
7/64” 0.1094 13/16” 1-13/16”
1/8” 0.125 7/8” 1-7/8”
9/64” 0.1406 15/16” 1-15/16”
5/32” 0.1562 1” 2-1/16”
11/64” 0.1719 1-1/16” 2-1/8”
3/16” 0.1875 1-1/8” 2-3/16”
13/64” 0.2031 1-3/16” 2-1/4”
7/32” 0.2188 1-1/4” 2-3/8”
15/64” 0.2344 1-5/16” 2-7/16”
1/4” 0.25 1-3/8” 2-1/2”
17/64” 0.2656 1-7/16” 2-5/8”
9/32” 0.2813 1-1/2” 2-11/16”
19/64” 0.2969 1-9/16” 2-3/4”
5/16” 0.3125 1-5/8” 2-13/16”
21/64” 0.3281 1-11/16” 2-15/16”
11/32” 0.3438 1-11/16” 3”
23/64” 0.3594 1-3/4” 3-1/16”
3/8” 0.375 1-13/16” 3-1/8”
25/64” 0.3906 1-7/8” 3-1/4”
13/32” 0.4062 1-15/16” 3-5/16”
27/64” 0.4219 2” 3-3/8”
7/16” 0.4375 2-1/16” 3-7/16”
29/64” 0.4531 2-1/8” 3-9/16”
15/32” 0.4688 2-1/8” 3-5/8”
31/64” 0.4844 2-3/16” 3-11/16”
1/2” 0.5 2-1/4” 3-3/4”
33/64” 0.5156 2-3/8” 3-7/8”
17/32” 0.5312 2-3/8” 3-7/8”
35/64” 0.5469 2-1/2” 4”
9/16” 0.5625 2-1/2” 4”
37/64” 0.5781 2-5/8” 4-1/8”
19/32” 0.5938 2-5/8” 4-1/8”
39/64” 0.6094 2-3/4” 4-1/4”
5/8” 0.625 2-3/4” 4-1/4”
41/64” 0.6406 2-7/8” 4-1/2”
21/32” 0.6562 2-7/8” 4-1/2”
43/64” 0.6719 2-7/8” 4-5/8”
11/16” 0.6875 2-7/8” 4-5/8”
45/64” 0.7031 3” 4-3/4”
23/32” 0.7188 3” 4-3/4”
47/64” 0.7344 3-1/8” 5”
3/4” 0.75 3-1/8” 5”
49/64” 0.7656 3-1/4” 5-1/8”
25/32” 0.7812 3-1/4” 5-1/8”
51/64” 0.7969 3-3/8” 5-1/4”
13/16” 0.8125 3-3/8” 5-1/4”
53/64” 0.8281 3-1/2” 5-3/8”
27/32” 0.8438 3-1/2” 5-3/8”
55/64” 0.8594 3-1/2” 5-1/2”
7/8” 0.875 3-1/2” 5-1/2”
57/64” 0.8906 3-5/8” 5-5/8”
29/32” 0.9062 3-5/8” 5-5/8”
59/64” 0.9219 3-3/4” 5-3/4”
15/16” 0.9375 3-3/4” 5-3/4”
61/64” 0.9531 3-7/8” 5-7/8”
31/32” 0.9688 3-7/8” 5-7/8”
63/64” 0.9844 4” 6”
1” 1 4” 6”
1-1/64” 1.0156 4” 6”
1-1/32” 1.0312 4” 6-1/4”
1-3/64” 1.0469 4” 6-1/4”
1-1/16” 1.0625 4” 6-1/4”
1-5/64” 1.0781 4” 6-1/4”
1-3/32” 1.0938 4” 6-1/4”
1-7/64” 1.1094 4” 6-1/4”
1-1/8” 1.125 4” 6-3/8”
1-9/64” 1.1406 4” 6-3/8”
1-5/32” 1.1562 4-1/4” 6-5/8”
1-11/64” 1.1719 4-1/4” 6-5/8”
1-3/16” 1.1875 4-1/4” 6-5/8”
1-1/4” 1.25 4-3/8” 6-3/4”
1-9/32” 1.2813 4-3/8” 7”
1-5/16” 1.3125 4-3/8” 7”
1-3/8” 1.375 4-1/2” 7-1/8”
1-13/32” 1.4062 4-3/4” 7-3/8”
1-7/16” 1.4375 4-3/4” 7-3/8”
1-1/2” 1.5 4-7/8” 7-1/2”
2” 2 5-5/8” 8-1/2”
       
Wire Sizes Decimal Equivalent (Inches) Flute Length (Inches) Overall Length (Inches)
1 0.228 1-5/16” 2-7/16”
2 0.221 1-5/16” 2-7/16”
3 0.213 1-1/4” 2-3/8”
4 0.209 1-1/4” 2-3/8”
5 0.2055 1-1/4” 2-3/8”
6 0.204 1-1/4” 2-3/8”
7 0.201 1-3/16” 2-1/4”
8 0.199 1-3/16” 2-1/4”
9 0.196 1-3/16” 2-1/4”
10 0.1935 1-3/16” 2-1/4”
11 0.191 1-3/16” 2-1/4”
12 0.189 1-3/16” 2-1/4”
13 0.185 1-1/8” 2-3/16”
14 0.182 1-1/8” 2-3/16”
15 0.18 1-1/8” 2-3/16”
16 0.177 1-1/8” 2-3/16”
17 0.173 1-1/8” 2-3/16”
18 0.1695 1-1/16” 2-1/8”
19 0.166 1-1/16” 2-1/8”
20 0.161 1-1/16” 2-1/8”
21 0.159 1-1/16” 2-1/8”
22 0.157 1-1/16” 2-1/8”
23 0.154 1” 2-1/16”
24 0.152 1” 2-1/16”
25 0.1495 1” 2-1/16”
26 0.147 1” 2-1/16”
27 0.144 1” 2-1/16”
28 0.1405 15/16” 1-15/16”
29 0.136 15/16” 1-15/16”
30 0.1285 15/16” 1-15/16”
31 0.12 7/8” 1-7/8”
32 0.116 7/8” 1-7/8”
33 0.113 7/8” 1-7/8”
34 0.111 7/8” 1-7/8”
35 0.11 7/8” 1-7/8”
36 0.1065 13/16” 1-13/16”
37 0.104 13/16” 1-13/16”
38 0.1015 13/16” 1-13/16”
39 0.0995 13/16” 1-13/16”
40 0.098 13/16” 1-13/16”
41 0.096 13/16” 1-13/16”
42 0.0935 3/4” 1-3/4”
43 0.089 3/4” 1-3/4”
44 0.086 3/4” 1-3/4”
45 0.082 3/4” 1-3/4”
46 0.081 3/4” 1-3/4”
47 0.0785 11/16” 1-11/16”
48 0.076 11/16” 1-11/16”
49 0.073 11/16” 1-11/16”
50 0.07 11/16” 1-11/16”
51 0.067 11/16” 1-11/16”
52 0.0635 11/16” 1-11/16”
53 0.0595 5/8” 1-5/8”
54 0.055 5/8” 1-5/8”
55 0.052 5/8” 1-5/8”
56 0.0465 1/2” 1-3/8”
57 0.043 1/2” 1-3/8”
58 0.042 1/2” 1-3/8”
59 0.041 1/2” 1-3/8”
60 0.04 1/2” 1-3/8”
       
Letter Sizes Decimal Equivalent (Inches) Flute Length (Inches) Overall Length (Inches)
A 0.234 1-5/16” 2-7/16”
B 0.238 1-3/8” 2-1/2”
C 0.242 1-3/8” 2-1/2”
D 0.246 1-3/8” 2-1/2”
E 0.25 1-3/8” 2-1/2”
F 0.257 1-7/16” 2-5/8”
G 0.261 1-7/16” 2-5/8”
H 0.266 1-1/2” 2-11/16”
I 0.272 1-1/2” 2-11/16”
J 0.277 1-1/2” 2-11/16”
K 0.281 1-1/2” 2-11/16”
L 0.29 1-9/16” 2-3/4”
M 0.295 1-9/16” 2-3/4”
N 0.302 1-5/8” 2-13/16”
O 0.316 1-11/16” 2-15/16”
P 0.323 1-11/16” 2-15/16”
Q 0.332 1-11/16” 3”
R 0.339 1-11/16” 3”
S 0.348 1-3/4” 3-1/16”
T 0.358 1-3/4” 3-1/16”
U 0.368 1-13/16” 3-1/8”
V 0.377 1-7/8” 3-1/4”
W 0.386 1-7/8” 3-1/4”
X 0.397 1-15/16” 3-5/16”
Y 0.404 1-15/16” 3-5/16”
Z 0.413 2” 3-3/8”
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