0BA, Cap Head, Socket Screw (12.9).

0BA, Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), Self Colour. Fixaball sells all sizes and lengths of 0BA cap screws at the best internet prices and free delivery...
£6.17

0BA, Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), Self Colour.

Fixaball sells all sizes and lengths of 0BA cap screws at the best internet prices and free delivery

Orders placed before 2pm are usually dispatched same day (Mon-Fri).

Please make your size and pack quantity selection from the drop down menus at the top of the page.

Socket Cap Screws come as 'sets' and 'bolts'. The, ‘SET’, term is used to describe a fastener that is fully threaded in lengths up to and around 1 inch (from the underside of the head. Over 1 inch in length the fastener will have a, 'shoulder,' or unthreaded area under the head. This space of unthreaded area confirms that the fastener is now a bolt (cap head, bolt in this case). Some people might simply call them Allen or, 'Allan bolts,' in association with the Allen, Hexagonal Key which is used to tighten and loosen the fastener. So, ‘Socket,’ refers to the hexagon shaped indentation found on the top of the fasteners’ head.

Material

High Tensile – 12.9 Grade.

BA Threads

BA screw threads, named after the British Association for Advancement of Science, were devised in 1884 and standardised in 1903. Screws were described as "2BA", "4BA" etc., BA threads are specified by British Standard BS 93:1951 "Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A." They are associated with metric units of measurement.

Important BA Thead Information

Screw Numbers

Diameter of Screw 
Over Thread

Head Across Flats

Threads per inch

Pitch

Diameter 
at Thread Bottom

Tapping Drill Size

16 BA

0.0310 inch

0.054 inch

133.3 tpi

0.0075 inch

0.0220 inch

Number drill 73
0.6 mm
0.0236 inch

15 BA

0.035 inch

0.061 inch

120.5 tpi

0.0083 inch

0.025 inch

Number drill 70
0.7 mm
0.0276 inch

14 BA

0.039 inch

0.068 inch

109.9 tpi

0.0091inch

0.028 inch

0.8 mm
0.0315 inch

13 BA

0.047 inch

0.082 inch

102 tpi

0.0098 inch

0.0352 inch

Number drill 62
0.98 mm
0.0386 inch

12 BA

0.051 inch

0.089 inch

90.9 tpi

0.011 inch

0.0378 inch

Number drill 60
1.05 mm
0.0413 inch

11 BA

0.059 inch

0.103 inch

81.9 tpi

0.0122 inch

0.0443 inch

Number drill 56
1.2 mm
0.0472 inch

10 BA

0.067 inch

0.117 inch

72.6 tpi

0.0138 inch

0.0504 inch

Number drill 54
1.4 mm
0.0551 inch

9 BA

0.075 inch

0.131 inch

65.1 tpi

0.0154 inch

0.0565 inch

1.55 mm
0.061 inch

8 BA

0.086 inch

0.151 inch

59.1 tpi

0.0169 inch

0.0657 inch

Number drill 50
1.8 mm
0.0709 inch

7 BA

0.0982 inch

0.172 inch

52.9 tpi

0.0189 inch

0.0753 inch

Number drill 46
2.05 mm
0.0807 inch

6 BA

0.11 inch

0.193 inch

47.9 tpi

0.0209 inch

0.0849 inch

2.3 mm
0.0906 inch

5 BA

0.126 inch

0.221 inch

43 tpi

0.0232 inch

0.0981 inch

Number drill 37
2.65 mm
0.1043 inch

4 BA

0.1420 inch

0.249 inch

38.5 tpi

0.0260 inch

0.1108 inch

Number drill 31
3 mm
0.1181 inch

3 BA

0.1610 inch

0.282 inch

34.8 tpi

0.0287 inch

0.1266 inch

Number drill 29
3.4 mm
0.1339 inch

2 BA

0.1850 inch

0.324 inch

31.4 tpi

0.0319 inch

0.1467 inch

Number drill 22
4 mm
0.1575 inch

1 BA

0.2090 inch

0.366 inch

28.2 tpi

0.0354 inch

0.1665 inch

Number drill 16
4.5 mm
0.1772 inch

0 BA

0.2360 inch

0.413 inch

25.4 tpi

0.0394 inch

0.1887 inch

Number drill 9
5.1 mm
0.2008 inch

 

 

Theoretical Sizes Available at Fixaball

0BA x 13/4"

1BA x 1/2"

1BA x 1"

2BA x 1/2"

2BA x 3/4"

2BA x 1"

3BA x 1/2"

3BA x 3/4"

3BA x 1"

4BA x 1/4"

4BA x 1/2"

4BA x 3/4"

4BA x 1"

5BA x 1/4"

5BA x 3/8"

5BA x 1/2"

5BA x 3/4"

5BA x 1"

6BA x 1/4"

6BA x 3/8"

6BA x 1/2"

6BA x 3/4"

6BA x 1"

7BA x 1/4"

7BA x 3/8"

7BA x 1/2"

7BA x 1"

7BA x 30mm

8BA x 1/4"

8BA x 3/8"

8BA x 1/2"

8BA x 5/8"

8BA x 3/4"

9BA x 1/2"

9BA x 1"

10BA x 1/4"

10BA x 3/8"

10BA x ½"

Image is for illustrative purposes only.