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
Thread Spec: BSW 1/8 5/32 3/16 1/4 5/16. Socket Cap Head Screw Allen Bolts Hex Drive. Drive Style: Hex Drive. Material: Carbon Steel (High
BSW 1/8 5/32 3/16 1/4 5/16Hex Socket Cap Screw High Tensile 12.9 Allen Bolt
UNC 1/4 Socket Cap Screw High Tensile 12.9 Self Colour DIN912 – Fixaball Ltd. Fixings and Fasteners UK
Whitworth Fully Threaded Hex Bolt - Strength Classification = 10.9, SUNCO
Socket Cap Screw - United Fasteners
3/8-16 x 1/2 Button Head Socket Cap Screws, 304 Stainless Steel 18-8, Bright Finish, Fully Threaded, Coarse Thread UNC, 25 PCS : Industrial & Scientific
ALLEN SOCKET CAP HEAD SCREWS
5/16 3/8 1/2 BSW Whitworth capuchon haute traction tête boulons vis à douille EUR 5,47 - PicClick FR
3/16 WHITWORTH BSW x 1/2 Brass Round Head Screws (Qty 10) UK Manufacturer £5.60 - PicClick UK
Wholesale grade 8 bolts Made For Various Purposes On Sale
3/8-16 x 2-1/2 Button Head Socket Cap Bolts Screws, 304 Stainless Steel 18-8, Full Thread, Coarse Thread UNC, Allen Hex Drive, 10 PCS : Industrial & Scientific
BOLLINO TESTA BULLONE a vite alta trazione 1/8 3/16 3/8 BSW 3/16 1/4 5/16 3/8 BSW EUR 8,88 - PicClick IT
