1.Material: 20Cr MnTi 3.164*54 2.Universal joint OEM order accepted 3.U-Joint for heavy-duty 4.Prompt delivery Universal joint, U joint, Cardan joint, Hardy-Spicer joint or Hooke's joint - call it what you like, it's used universally (pardon the pun) in all kinds of transmission shafts. The first cars had them (it was Henry Ford who named it the "universal joint"), and now you have come here ...