45pcs. Stud bolt M45x280 acc. to DIN 2510/Z Material bolt: 1.7709 (21CrMoV57) Surface treatment nuts: Xylan 1070 Blue With 2 nuts per bolt M45 acc. to DIN 2510/NF Material nuts: 1.7218 (25CrMoV4) Surface treatment nuts: Xylan 1070 Blue If the Xylan blue is not possible, you may offer without the Xylan, because we can do the Xylan 1070 ourselves. If offer blank, please offer than with oversized nuts. Also please offer inclusive express cost and incl. 3.1 certificate.