这个单位是什么意思?

灵魂在呐喊

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terminal screws shall have a declared outside diameter of not less than 3mm or be not less than 6 B.A
; \: h4 `6 L( z4 Y1 K! g. p# v$ P请问,这个B.A是什么意思,有详细的说明吗.谢谢!

% x' x7 T3 K; S5 Z
3 L) B1 w% k, k

H-RH

Screw Numbers	Diameter of Screw Over Thread	Threads per inch	Pitch	Diameter " P& P0 I( H8 H  _at Thread Bottom	Tapping Drill Size
16 BA	0.0310 inch	133.3 tpi	0.0075 inch	0.0220 inch	Number drill 73 0 x5 y* |! C. s: I6 x& W0.6 mm 6 h/ g5 A/ K7 U9 S0.0236 inch
15 BA	0.035 inch	120.5 tpi	0.0083 inch	0.025 inch	Number drill 70 3 u6 G( d2 y6 Y0.7 mm 0.0276 inch
14 BA	0.039 inch	109.9 tpi	0.0091inch	0.028 inch	0.8 mm 4 v" w0 h- V! f2 t% G/ U0.0315 inch
13 BA	0.047 inch	102 tpi	0.0098 inch	0.0352 inch	Number drill 62 0.98 mm 0 A% W) \4 ]% [7 ]: Q4 ^0.0386 inch
12 BA	0.051 inch	90.9 tpi	0.011 inch	0.0378 inch	Number drill 60 1.05 mm + O. Q! S$ E; T- X, I0.0413 inch
11 BA	0.059 inch	81.9 tpi	0.0122 inch	0.0443 inch	Number drill 56 1.2 mm 7 W% i) C5 v/ u* ^# W0.0472 inch
10 BA	0.067 inch	72.6 tpi	0.0138 inch	0.0504 inch	Number drill 54 1.4 mm 0.0551 inch
9 BA	0.075 inch	65.1 tpi	0.0154 inch	0.0565 inch	1.55 mm 6 N1 d: d$ |5 d% ~: v0.061 inch
8 BA	0.086 inch	59.1 tpi	0.0169 inch	0.0657 inch	Number drill 50 1.8 mm # d2 ^+ {0 Q$ t" d) G0 N0.0709 inch
7 BA	0.0982 inch	52.9 tpi	0.0189 inch	0.0753 inch	Number drill 46 2.05 mm 8 W6 Z) t4 G) W+ s' j0.0807 inch
6 BA	0.11 inch	47.9 tpi	0.0209 inch	0.0849 inch	2.3 mm 0.0906 inch
5 BA	0.126 inch	43 tpi	0.0232 inch	0.0981 inch	Number drill 37 2.65 mm 0.1043 inch
4 BA	0.1420 inch	38.5 tpi	0.0260 inch	0.1108 inch	Number drill 31 . W) Y0 h* @/ @; A' {3 mm ! J) q3 g" O8 r1 U. ~0.1181 inch
3 BA	0.1610 inch	34.8 tpi	0.0287 inch	0.1266 inch	Number drill 29 3.4 mm $ X; @, k# \" l9 W, p0.1339 inch
2 BA	0.1850 inch	31.4 tpi	0.0319 inch	0.1467 inch	Number drill 22 4 Q7 o6 V7 W! R0 F4 mm 0.1575 inch
1 BA	0.2090 inch	28.2 tpi	0.0354 inch	0.1665 inch	Number drill 16 ) [( z7 t- q3 v/ t: `4.5 mm 4 l$ b" k( r" _' h: G( _( J& M0.1772 inch
0 BA	0.2360 inch	25.4 tpi	0.0394 inch	0.1887 inch	Number drill 9 5.1 mm & ^  Z" l: W% F. X( H0.2008 inch

灵魂在呐喊

H-RH 发表于 2013-5-3 16:10

* g6 ~3 ?+ E& D6 R不知道此文章的出处在哪里呀

H-RH

灵魂在呐喊 发表于 2013-5-3 16:49
/ @+ T' q+ ^- |! X不知道此文章的出处在哪里呀

1 |2 r! E2 Z9 n0 @http://www.britishfasteners.com/threads/