BSF, 1/4", Cap Head, Socket Screw (12.9).
BSF, 1/4", Cap Head, Bolt/ Socket Screw/ Allen Bolt/, High Tensile (12.9), BS 2470.
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Socket Screw is short for, 'Socket Set Screw.' The, ‘Socket Screw,’ 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. A little confusing, no? Some engineers may call them screws if the person only uses the shorter length range of sizes, under an inch. Some people might simply call them Allen or, 'Allan,' if they've never seen it written down in association with the Allen, Hexagonal Key. So, ‘Socket,’ refers to the hexagon shaped indentation found on the top of the fasteners’ head. Here, you can use a hexagon key (Allen Key) to tighten and loosen the fastener.
British Standard Fine (BSF)
British Standard Fine (BSF) is a screw thread form, as a fine-pitch alternative to British Standard Whitworth (BSW) thread. It was used for steel bolts and nuts on much British machinery, including cars, prior to adoption of Unified, and later Metric, standards. For highly stressed conditions, especially in motorcycles, a finer thread, British Standard Cycle (BSC), was used as well.
BSF was developed by R. E. B. Crompton, and his assistant George Field. BSF threads use the 55 degree Whitworth thread form. It was introduced by the British Engineering Standards Association in 1908.
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