Screw Numbers | Diameter of Screw
" {( l6 W% z+ L6 i: |" b& W! v3 IOver Thread | Threads per inch | Pitch | Diameter
* t. V9 u# G7 q6 m& q; ?6 o3 Tat Thread Bottom | Tapping Drill Size |
16 BA | 0.0310 inch | 133.3 tpi | 0.0075 inch | 0.0220 inch | Number drill 73
% N- E; d, y7 p+ q0 h/ H0.6 mm
$ c1 c" P0 O4 T2 d. x0.0236 inch |
15 BA | 0.035 inch | 120.5 tpi | 0.0083 inch | 0.025 inch | Number drill 70
+ y1 h6 j% [1 i+ U8 D/ p% k0.7 mm h9 X: f8 y! G% U; z% R$ ]2 t
0.0276 inch |
14 BA | 0.039 inch | 109.9 tpi | 0.0091inch | 0.028 inch | 0.8 mm6 d- y7 G% b% m! ]% z
0.0315 inch |
13 BA | 0.047 inch | 102 tpi | 0.0098 inch | 0.0352 inch | Number drill 62
: `) c# T: @* l0.98 mm
) q3 y0 T4 B! A0.0386 inch |
12 BA | 0.051 inch | 90.9 tpi | 0.011 inch | 0.0378 inch | Number drill 602 P* W0 z# S5 ]* o2 E% K8 |. ~6 O% Z
1.05 mm$ R0 B* s" N5 ?/ _- X/ ^
0.0413 inch |
11 BA | 0.059 inch | 81.9 tpi | 0.0122 inch | 0.0443 inch | Number drill 56/ U% Z3 z: L- t( M' v
1.2 mm( i9 G- R) U9 p0 L9 O
0.0472 inch |
10 BA | 0.067 inch | 72.6 tpi | 0.0138 inch | 0.0504 inch | Number drill 54
2 o$ Z0 i4 @( n6 _: y1.4 mm' q- v1 \1 P* n! n4 }" `; Z' W; Y0 h, r
0.0551 inch |
9 BA | 0.075 inch | 65.1 tpi | 0.0154 inch | 0.0565 inch | 1.55 mm
5 n; F3 j7 W' ]% `1 _! J0.061 inch |
8 BA | 0.086 inch | 59.1 tpi | 0.0169 inch | 0.0657 inch | Number drill 50
3 m& Q( V9 |2 t; k8 k9 Y1.8 mm
9 U8 ~5 H# a1 d N; j1 j0.0709 inch |
7 BA | 0.0982 inch | 52.9 tpi | 0.0189 inch | 0.0753 inch | Number drill 46
5 u/ T! Y% {% T; N) @2.05 mm
7 a: o9 w: }2 X0.0807 inch |
6 BA | 0.11 inch | 47.9 tpi | 0.0209 inch | 0.0849 inch | 2.3 mm
( x) J# {2 V2 P0.0906 inch |
5 BA | 0.126 inch | 43 tpi | 0.0232 inch | 0.0981 inch | Number drill 37
* [. [1 [4 g: Q6 z2.65 mm
$ R1 @: K8 g/ s3 ^1 N& B6 c0.1043 inch |
4 BA | 0.1420 inch | 38.5 tpi | 0.0260 inch | 0.1108 inch | Number drill 31 A" }5 R# |( n
3 mm
( ?5 O! l/ P' y0.1181 inch |
3 BA | 0.1610 inch | 34.8 tpi | 0.0287 inch | 0.1266 inch | Number drill 296 d" V, y9 ]6 G* C* y! d! ~6 t
3.4 mm" f4 K6 g8 Q+ h& u
0.1339 inch |
2 BA | 0.1850 inch | 31.4 tpi | 0.0319 inch | 0.1467 inch | Number drill 22
; Z) G4 x; n+ _1 S4 mm
' ~) Q H3 p8 o, O; g1 f- c7 u1 |0.1575 inch |
1 BA | 0.2090 inch | 28.2 tpi | 0.0354 inch | 0.1665 inch | Number drill 16$ w' {2 U7 b$ @& n7 J4 K. ]
4.5 mm8 C6 U; p2 t/ C# `( U9 [
0.1772 inch |
0 BA | 0.2360 inch | 25.4 tpi | 0.0394 inch | 0.1887 inch | Number drill 9% r9 F4 |, I1 g' v. O" I
5.1 mm& r" o# N. M3 y& s* y
0.2008 inch |