Company in the aircraft field looks for a supplier of DIN 931, DIN 7991, DIN 4762 x= hole on the thread for castle nut Hexagon head bolts M6 55-15 UNI 5737 (DIN 931) X Hexagon head bolts M6 12-15 UNI 5737 (DIN 931) X Hexagon head bolts (with hiole) M6 12 UNI 5737 (DIN 931) X Hexagon socket countersunk head screws  28-10 UNI 5933 (DIN 7991) X Hexagon head bolts M6 30-15 UNI 5737 (DIN 931) X Hexagon socket head cap screws  M10 22-18 UNI 4762 (DIN 4762 ) X Hexagon head bolts M6 25-15 UNI 5737 (DIN 931) X Hexagon head bolts M6 35-15 UNI 5737 (DIN 931) X Hexagon head bolts M6 15-15 UNI 5737 (DIN 931) X Hexagon head bolts M6 20-15 UNI 5737 (DIN 931) X Hexagon head bolts M8 20-15 UNI 5737 (DIN 931) Hexagon head bolts M8 25-15 UNI 5737 (DIN 931) Hexagon head bolts M5 50-10 UNI 5737 (DIN 931) X Hexagon head bolts M8 40-15 UNI 5737 (DIN 931) Hexagon head bolts M6 10-15 UNI 5737 (DIN 931) Hexagon head bolts M6 22-13 UNI 5737 (DIN 931) X Hexagon head bolts M6 7-15 UNI 5737 (DIN 931) X Example: M8 20-15 , 20mm shank, 15mm thread