A2 Stainless BSF Wing Nuts 1/4" 5/16" 3/8" A2 Stainless BSF Wing (Thumb) Nuts British Standard Fine Thread 1/4" - 26 TPI 5/16" - 22 TPI 3/8" - 20 TPI £2.23 (Inc. VAT) £1.86 (Ex. VAT) Choose Options Compare