Zinc plated Steel (BZP). Whitworth BSW. With a slotted round head. Machine screws. Thread size: 3/16" & 1/4".
Whitworth Round Machine Screws BSW Slotted Head Bolt Camera Imperial Vintage NOS
1/4" BSW Whitworth x 1/2" Brass Round Head Screws - Pack 10
WHITWORTH BSW COUNTERSUNK SCREWS ALLEN SOCKET BOLTS HIGH TENSILE 1/4" 5/16" 3/8"
Whitworth Cheese Machine Screws BSW Slotted Head Bolt Camera Imperial Vintage
3/16", Stainless Steel, Whitworth, CSK, Machine Screws.
Whitworth Socket Set Screws Grub BSW Hex Allen Key Head Self Colour Vintage NOS
