U-bolt in English dictionary U-bolt Meanings and definitions of "U-bolt" A metal fixing in the shape of the letter U, which has a pin or screw bolt closure which fits across the two ends making a closed clamp noun a metal fixing in the shape of the letter U, which has a pin or screw bolt closure which fits across the two ends making a closed clamp noun a metal bar in the shape of the letter U with screw threads on both ends. U-bolts have primarily been used to support pipework. more Grammar and declension of U-bolt U-bolt ( plural U-bolts) U-bolt (plural U-bolts) more u-bolt Sample sentences with "U-bolt" Declension Stem Try again Available translations French German Greek Hungarian Icelandic Irish Manx Persian Polish Russian Tamil Turkish Ukrainian Authors