M20-2.50 x 70 Hex Cap Screw DIN 933 A2 (18-8) Stainless Steel - DIN 933 A2 Hex Cap Screws are manufactured from A2-70 stainless steel per ISO 3506 part 1. These are fully threaded hex cap screws (i.e. tap bolts) with all dimensions conforming to DIN 933. Designed for use in pre-tapped holes and where corrossion is of concern.