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, 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, Taper

Tap, BA, HSS, 1BA, Taper

640-00.01T

$21.45

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, 3BA, Plug

Tap, BA, HSS, 3BA, Plug

640-00.03B

$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. Bottom

Tap, BA, HSS, 5BA. Bottom

640-00.05B

$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, 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, Intermediate

Tap BA HSS, 8BA, Intermediate

640-00.08I

$25.59

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

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

640-00.09-set

$84.31

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, 12BA, Set of 3

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

640-00.12-set

$130.60

Tap BA Carbon 0BA Plug

Tap BA Carbon 0BA Plug

641-00.00B

$11.00

Tap BA Carbon 0BA Taper

Tap BA Carbon 0BA Taper

641-00.00T

$11.00

Tap BA Carbon 1BA Inter

Tap BA Carbon 1BA Inter

641-00.01S

$12.10

Tap BA Carbon 2BA Set

Tap BA Carbon 2BA Set

641-00.02-set

$27.50

Tap BA Carbon 2BA Plug

Tap BA Carbon 2BA Plug

641-00.02B

$11.00

Tap BA Carbon 2BA Taper

Tap BA Carbon 2BA Taper

641-00.02T

$11.00

Tap BA Carbon 3BA set of 3

Tap BA Carbon 3BA set of 3

641-00.03-set

$27.50

Tap BA Carbon 3BA Inter

Tap BA Carbon 3BA Inter

641-00.03S

$7.70

Tap BA Carbon 4BA Plug

Tap BA Carbon 4BA Plug

641-00.04B

$8.80

Tap BA Carbon 6BA set of 3

Tap BA Carbon 6BA set of 3

641-00.06-set

$22.00

Tap BA Carbon 6BA Taper

Tap BA Carbon 6BA Taper

641-00.06T

$8.25

Tap BA Carbon 7BA set of 3

Tap BA Carbon 7BA set of 3

641-00.07-set

$27.50

Tap BA Carbon 8BA set of 3

Tap BA Carbon 8BA set of 3

641-00.08-set

$24.20

Tap BA Carbon 9BA Plug

Tap BA Carbon 9BA Plug

641-00.09B

$10.75

Tap BA Carbon 9BA Inter

Tap BA Carbon 9BA Inter

641-00.09S

$14.30

Tap BA Carbon 10BA set of 3

Tap BA Carbon 10BA set of 3

641-00.10-set

$18.70

Tap BA Carbon 10BA Plug

Tap BA Carbon 10BA Plug

641-00.10B

$11.55

Tap BA Carbon 10BA Taper

Tap BA Carbon 10BA Taper

641-00.10T

$11.55

Tap BA Carbon 12BA set of 3

Tap BA Carbon 12BA set of 3

641-00.12-set

$27.50

Tap BA Carbon 12BA Plug

Tap BA Carbon 12BA Plug

641-00.12B

$13.20

Tap BA Carbon 12BA Taper

Tap BA Carbon 12BA Taper

641-00.12T

$11.00

Dormer 8BA Spiral Tap, Taper

Dormer 8BA Spiral Tap, Taper

DRM-E544BA8BLUE

$70.00

9% OFF RRP $77.00