That fits

Description Article no. Article Image  
Seal Ring Seal Ring DIN 11851 DN50 NBR 1000400005054 Seal Ring DIN 11851 DN50 NBR
Male Male long DN50 1.4404 polished 1201300005030F Male long DN50 1.4404 polished
Nut Nut DIN 11851 with Undercut DN50 1.4404 polished 1100300005030F Nut DIN 11851 with Undercut DN50 1.4404 polished