BA

British Association (BA) Screw Threads are one of the most common threads used in model engineering around the Western world. 

More information on the BA thread standard can be found on the Wikipedia page here.

Thread Outside Diameter (mm) Tap Drill (mm)
0BA 6.00 5.1
1BA 5.30 4.5
2BA 4.70 4.0
3BA 4.10 3.45
4BA 3.60 3.00
5BA 3.20 2.65
6BA 2.80 2.30
7BA 2.50 2.05
8BA 2.20 1.80
9BA 1.90 1.55
10BA 1.70 1.40
12BA 1.30 1.05

 



Tap, BA, HSS, 0BA, Set of 3

Tap, BA, HSS, 0BA, Set of 3

640-00.00-set

$38.03

Tap, BA, HSS, 0BA, Plug

Tap, BA, HSS, 0BA, Plug

640-00.00B

$21.04

Tap, BA, HSS, 0BA, Intermediate

Tap, BA, HSS, 0BA, Intermediate

640-00.00I

$21.04

Tap, BA, HSS, 0BA, Taper

Tap, BA, HSS, 0BA, Taper

640-00.00T

$21.04

Tap, BA, HSS, 1BA, Set of 3

Tap, BA, HSS, 1BA, Set of 3

640-00.01-set

$39.30

Tap, BA, HSS, 1BA, Plug

Tap, BA, HSS, 1BA, Plug

640-00.01B

$21.45

Tap, BA, HSS, 1BA, Intermediate

Tap, BA, HSS, 1BA, Intermediate

640-00.01I

$21.45

Tap, BA, HSS, 1BA, Taper

Tap, BA, HSS, 1BA, Taper

640-00.01T

$21.45

Tap, BA, HSS, 2BA, Set of 3

Tap, BA, HSS, 2BA, Set of 3

640-00.02-set

$36.24

6% OFF RRP $38.50
Tap, BA, HSS, 2BA, Plug

Tap, BA, HSS, 2BA, Plug

640-00.02B

$20.44

Tap, BA, HSS, 2BA, Intermediate

Tap, BA, HSS, 2BA, Intermediate

640-00.02I

$20.44

Tap, BA, HSS, 2BA, Taper

Tap, BA, HSS, 2BA, Taper

640-00.02T

$20.44

Tap, BA, HSS, 3BA, Set of 3

Tap, BA, HSS, 3BA, Set of 3

640-00.03-Set

$38.98

Tap, BA, HSS, 3BA, Plug

Tap, BA, HSS, 3BA, Plug

640-00.03B

$21.35

Tap, BA, HSS, 3BA, Intermediate

Tap, BA, HSS, 3BA, Intermediate

640-00.03I

$21.35

Tap, BA, HSS, 3BA, Taper

Tap, BA, HSS, 3BA, Taper

640-00.03T

$21.35

Tap, BA, HSS, 4BA, Set of 3

Tap, BA, HSS, 4BA, Set of 3

640-00.04-set

$36.24

6% OFF RRP $38.50
Tap, BA, HSS, 4BA, Bottom

Tap, BA, HSS, 4BA, Bottom

640-00.04B

$20.44

Tap, BA, HSS, 4BA, Intermediate

Tap, BA, HSS, 4BA, Intermediate

640-00.04I

$20.44

Tap, BA, HSS, 4BA, Taper

Tap, BA, HSS, 4BA, Taper

640-00.04T

$20.44

Tap, BA, HSS, 5BA, Set of 3

Tap, BA, HSS, 5BA, Set of 3

640-00.05-Set

$37.20

7% OFF RRP $40.00
Tap, BA, HSS, 5BA. Bottom

Tap, BA, HSS, 5BA. Bottom

640-00.05B

$20.77

Tap, BA, HSS, 5BA, Intermediate

Tap, BA, HSS, 5BA, Intermediate

640-00.05I

$20.77

Tap, BA, HSS, 5BA, Left Hand

Tap, BA, HSS, 5BA, Left Hand

640-00.05LH

$20.77

31% OFF RRP $30.00
Tap, BA, HSS, 5BA, Taper

Tap, BA, HSS, 5BA, Taper

640-00.05T

$20.77

Tap, BA, HSS, 6BA, Set of 3

Tap, BA, HSS, 6BA, Set of 3

640-00.06-set

$39.30

Tap, BA, HSS, 6BA, Plug

Tap, BA, HSS, 6BA, Plug

640-00.06B

$21.45

2% OFF RRP $22.00
Tap, BA, HSS, 6BA, Intermediate

Tap, BA, HSS, 6BA, Intermediate

640-00.06I

$21.45

Tap, BA, HSS, 6BA, Taper

Tap, BA, HSS, 6BA, Taper

640-00.06T

$21.45

2% OFF RRP $22.00
Tap, BA, HSS, 7BA, Set of 3

Tap, BA, HSS, 7BA, Set of 3

640-00.07-set

$53.34

Tap, BA, HSS, 7BA, Plug

Tap, BA, HSS, 7BA, Plug

640-00.07B

$26.11

Tap, BA, HSS, 7BA, Intermediate

Tap, BA, HSS, 7BA, Intermediate

640-00.07I

$26.11

Tap, BA, HSS, 7BA, Taper

Tap, BA, HSS, 7BA, Taper

640-00.07T

$26.11

Tap, BA, HSS, 8BA, Set of 3

Tap, BA, HSS, 8BA, Set of 3

640-00.08-set

$51.79

33% OFF RRP $77.70
Tap BA HSS, 8BA, Plug

Tap BA HSS, 8BA, Plug

640-00.08B

$25.59

8% OFF RRP $27.90
Tap BA HSS, 8BA, Intermediate

Tap BA HSS, 8BA, Intermediate

640-00.08I

$25.59

Tap BA HSS, 8BA, Taper

Tap BA HSS, 8BA, Taper

640-00.08T

$25.59

8% OFF RRP $27.90
Tap, BA, HSS, 9BA, Set of 3

Tap, BA, HSS, 9BA, Set of 3

640-00.09-set

$84.31

Tap BA HSS, 9BA, Plug

Tap BA HSS, 9BA, Plug

640-00.09B

$36.37

Tap BA HSS, 9BA, Intermediate

Tap BA HSS, 9BA, Intermediate

640-00.09I

$36.37

Tap BA HSS, 9BA, Taper

Tap BA HSS, 9BA, Taper

640-00.09T

$36.37

Tap, BA, HSS, 10BA, Set of 3

Tap, BA, HSS, 10BA, Set of 3

640-00.10-set

$88.10

Tap, BA, HSS, 10BA, Plug

Tap, BA, HSS, 10BA, Plug

640-00.10B

$37.65

Tap, BA, HSS, 10BA, Intermediate

Tap, BA, HSS, 10BA, Intermediate

640-00.10I

$37.65

Tap, BA, HSS, 10BA, Taper

Tap, BA, HSS, 10BA, Taper

640-00.10T

$37.65

24% OFF RRP $49.41
Tap, BA, HSS, 12BA, Set of 3

Tap, BA, HSS, 12BA, Set of 3

640-00.12-set

$130.60

Tap, BA, HSS, 12BA, Plug

Tap, BA, HSS, 12BA, Plug

640-00.12B

$51.77

Tap, BA, HSS, 12BA, Intermediate

Tap, BA, HSS, 12BA, Intermediate

640-00.12I

$51.77

Tap, BA, HSS, 12BA, Taper

Tap, BA, HSS, 12BA, Taper

640-00.12T

$51.77

Tap BA Carbon 0BA Plug

Tap BA Carbon 0BA Plug

641-00.00B

$11.00