5/16 3/8 1/2 BSW Whitworth High Tensile Cap Head Allen Bolts Socket Screws

They are a BS 2470:1973. The technical data for the material is that it is high tensile grade alloy steel, heat treated to RC39-43. The material has a

5/16 BSW Whitworth Hex Set High Tensile R/ 8.8 Self-Colour DIN933 – Fixaball Ltd. Fixings and Fasteners UK

PACK OF 4 Socket Head Cap Screws with Threadlocker Adhesive FNFP £3.78 - PicClick UK

BSW-Whitworth, Hex Bolts / Sets, High Tensile (R), Self-Colour and Zinc DIN 933, Fixaball sells a great range of rare Whitworth Hex-Bolts and Hex

BSW Whitworth Hex Bolt Set High Tensile 8.8 Self-Colour Zinc DIN933

Socket Cap Head Screws

3/16 WHITWORTH BSW x 1/2 Brass Round Head Screws (Qty 10) UK Manufacturer £5.60 - PicClick UK

WHITWORTH Bolts - Arun Fasteners

5Pcs 1/8-40x1/2 BSW Button Head Socket Cap Screws Allen Bolts High Tensile Grade 10.9 Alloy Steel (5Pcs, 1/8-40 * 1/2): : Industrial & Scientific

BSW PCP Set (Grub) Socket Screws

5/16 3/8 1/2 BSW Allen Bolts Full Threaded Socket Head Cap Screws A2 SS-304: : Industrial & Scientific