Screw Numbers | Diameter of Screw * q1 q% f1 R. a; a- x& v* \' ~" Z! k
Over Thread | Threads per inch | Pitch | Diameter & ]1 x8 B9 G9 N
at Thread Bottom | Tapping Drill Size |
16 BA | 0.0310 inch | 133.3 tpi | 0.0075 inch | 0.0220 inch | Number drill 73
; X0 R% F9 E# x& z7 \5 @9 Q8 w0.6 mm
' a* N! E9 |2 L# Z" w7 l+ V0.0236 inch |
15 BA | 0.035 inch | 120.5 tpi | 0.0083 inch | 0.025 inch | Number drill 70
; ]5 }# D' `8 @# l! J$ ^9 |) s. g0.7 mm
0 x) q B" A: N7 V" G0.0276 inch |
14 BA | 0.039 inch | 109.9 tpi | 0.0091inch | 0.028 inch | 0.8 mm4 b" J f7 a! E @5 L
0.0315 inch |
13 BA | 0.047 inch | 102 tpi | 0.0098 inch | 0.0352 inch | Number drill 62$ M: }- A! [5 B2 t& d5 ^3 |- }; n
0.98 mm) X: y- R* I3 R8 r5 \
0.0386 inch |
12 BA | 0.051 inch | 90.9 tpi | 0.011 inch | 0.0378 inch | Number drill 60$ t& I3 X9 o" G; P, O( U5 Z+ O
1.05 mm5 g5 A0 S# d% E6 U M
0.0413 inch |
11 BA | 0.059 inch | 81.9 tpi | 0.0122 inch | 0.0443 inch | Number drill 56
' |" G$ ?3 g/ b7 J$ A! {, k1.2 mm
, d' K1 C( a# B' v/ O5 n1 e0.0472 inch |
10 BA | 0.067 inch | 72.6 tpi | 0.0138 inch | 0.0504 inch | Number drill 54
5 W5 V% e- F. {* P- e9 g6 y0 ^( G% ?1.4 mm
0 U& U4 C/ c7 d0.0551 inch |
9 BA | 0.075 inch | 65.1 tpi | 0.0154 inch | 0.0565 inch | 1.55 mm' E' S3 V2 G+ A7 i/ w( K
0.061 inch |
8 BA | 0.086 inch | 59.1 tpi | 0.0169 inch | 0.0657 inch | Number drill 50
/ [5 l, Z, H" M% O2 H1.8 mm
/ i; I3 P! \2 C, G6 a0.0709 inch |
7 BA | 0.0982 inch | 52.9 tpi | 0.0189 inch | 0.0753 inch | Number drill 46 u- Q8 o3 j8 D& n1 a( Z- w5 |
2.05 mm( {. P% D% L/ e
0.0807 inch |
6 BA | 0.11 inch | 47.9 tpi | 0.0209 inch | 0.0849 inch | 2.3 mm+ f* F+ z% O! w3 S) t1 k
0.0906 inch |
5 BA | 0.126 inch | 43 tpi | 0.0232 inch | 0.0981 inch | Number drill 378 U! D3 ?! J* l( e
2.65 mm
2 U8 F' E# o1 V4 A v0.1043 inch |
4 BA | 0.1420 inch | 38.5 tpi | 0.0260 inch | 0.1108 inch | Number drill 310 J% D* V) ^' K8 c2 I! g; Z5 X; r
3 mm1 p3 }$ D' ^3 X$ F v
0.1181 inch |
3 BA | 0.1610 inch | 34.8 tpi | 0.0287 inch | 0.1266 inch | Number drill 29
e+ V0 X/ R; g" s1 [7 m c! t3.4 mm$ c) _ m3 ~: f6 C
0.1339 inch |
2 BA | 0.1850 inch | 31.4 tpi | 0.0319 inch | 0.1467 inch | Number drill 22
# k7 `& I2 [. F% q: [4 mm. {; O6 M9 s3 B; E4 |! x8 l0 t
0.1575 inch |
1 BA | 0.2090 inch | 28.2 tpi | 0.0354 inch | 0.1665 inch | Number drill 16
) l+ ~6 r9 k6 b1 C2 v& Q4.5 mm( w( P- X. d1 i p
0.1772 inch |
0 BA | 0.2360 inch | 25.4 tpi | 0.0394 inch | 0.1887 inch | Number drill 9
; J2 B( @% F) L$ F/ Q9 c' E5.1 mm
& l9 F4 S z. q+ ~, I: C0.2008 inch |