That fits

Description Article no. Article Image  
Male Male DIN 11851 long DN50 1.4404 polished 1101300005030 Male DIN 11851 long DN50 1.4404 polished
Nut Nut DIN 11851 with Undercut DN50 1.4404 polished 1100300005030 Nut DIN 11851 with Undercut DN50 1.4404 polished
Seal Ring Seal Ring DIN 11851 DN50 NBR 1000400005054 Seal Ring DIN 11851 DN50 NBR