2BA, Cap Head, Socket Screw (12.9).
2BA, Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), Self Colour.
Fixaball sells all sizes and lengths of 2BA 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 1-2 inches (from the underside of the head. Over 1-2 inches in length the fastener will have a, 'shoulder,' or unthreaded area under the head (plain shank). This space of unthreaded area confirms that the fastener is now a bolt (cap head, bolt in this case) and is shouldered. 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 |
Head Across Flats |
Threads per inch |
Pitch |
Diameter |
Tapping Drill Size |
|
16 BA |
0.0310 inch |
0.054 inch |
133.3 tpi |
0.0075 inch |
0.0220 inch |
Number drill 73 |
|
15 BA |
0.035 inch |
0.061 inch |
120.5 tpi |
0.0083 inch |
0.025 inch |
Number drill 70 |
|
14 BA |
0.039 inch |
0.068 inch |
109.9 tpi |
0.0091inch |
0.028 inch |
0.8 mm |
|
13 BA |
0.047 inch |
0.082 inch |
102 tpi |
0.0098 inch |
0.0352 inch |
Number drill 62 |
|
12 BA |
0.051 inch |
0.089 inch |
90.9 tpi |
0.011 inch |
0.0378 inch |
Number drill 60 |
|
11 BA |
0.059 inch |
0.103 inch |
81.9 tpi |
0.0122 inch |
0.0443 inch |
Number drill 56 |
|
10 BA |
0.067 inch |
0.117 inch |
72.6 tpi |
0.0138 inch |
0.0504 inch |
Number drill 54 |
|
9 BA |
0.075 inch |
0.131 inch |
65.1 tpi |
0.0154 inch |
0.0565 inch |
1.55 mm |
|
8 BA |
0.086 inch |
0.151 inch |
59.1 tpi |
0.0169 inch |
0.0657 inch |
Number drill 50 |
|
7 BA |
0.0982 inch |
0.172 inch |
52.9 tpi |
0.0189 inch |
0.0753 inch |
Number drill 46 |
|
6 BA |
0.11 inch |
0.193 inch |
47.9 tpi |
0.0209 inch |
0.0849 inch |
2.3 mm |
|
5 BA |
0.126 inch |
0.221 inch |
43 tpi |
0.0232 inch |
0.0981 inch |
Number drill 37 |
|
4 BA |
0.1420 inch |
0.249 inch |
38.5 tpi |
0.0260 inch |
0.1108 inch |
Number drill 31 |
|
3 BA |
0.1610 inch |
0.282 inch |
34.8 tpi |
0.0287 inch |
0.1266 inch |
Number drill 29 |
|
2 BA |
0.1850 inch |
0.324 inch |
31.4 tpi |
0.0319 inch |
0.1467 inch |
Number drill 22 |
|
1 BA |
0.2090 inch |
0.366 inch |
28.2 tpi |
0.0354 inch |
0.1665 inch |
Number drill 16 |
|
0 BA |
0.2360 inch |
0.413 inch |
25.4 tpi |
0.0394 inch |
0.1887 inch |
Number drill 9 |
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.
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