BA Socket Head Screw

BA screws are standard grade 12.9. Black finish is the standard. British Metrics offers a wide selection of British threaded socket cap screws. BA sizes are all the threads under 1/4 inch. 0 BA being the largest and 25 BA being the smallest. BA has a standard 47.5 deg thread angle. this thread is common now in fine instruments and clocks or watches. All threads follow the BS 93 spec.
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