M5 M6 Hammer Head Bolt T Screw and M5 M6 Hexagon Flange Nuts Set Carbon Steel Nickel Plated for 20 30 Series European Standard T-Slot Aluminum Profile(70 Pack): Amazon.com: Industrial & Scientific
M5 hammer nut for 3030 extrusions 8 mm groove - 20 pcs. | HOBBY-STORE
M3 M4 M5 M6 T mutter hammer kopf schiebe carbon stahl T slot mutter befestigungen für 3030 Serie Aluminium Profil extrusion Slot 8mm - AliExpress
M5 MS T-Nut Hammer Head Slide In for 30 Series Aluminum Profile SKU-5596 | Ronical Technologies LLP - Wide range of embedded electronics industrial engineering products like device programmers and automation products