BSF Nuts, Screws & Washers. Our VAT Number is GB 241 2418 36. BSW Nuts, Screws & Washers. M8/8mm socket cap screw, countersunk, hexagon setscrews a2 stainless allen key thread diameter m8 (8mm) pitch 1.25mm. All of our listings include VAT at the current rate and a VAT invoice is supplied with all orders.