Technical parameters of 377/406/440/508 drill pipe slewing bearing: outer diameter 602mm, inner diameter 398mm, thickness 80mm, center distance of outer ring screws 566mm, center distance of inner ring screws 434mm, 20 mounting holes in a single circle, hole diameter 18mm, center distance of adjacent bolt holes in the outer ring Distance 88.54mm (side to side 70.54mm)

Technical parameters of 530/575/580 drill pipe slewing bearing: outer diameter 662mm, inner diameter 458mm, thickness 80mm, center distance of outer ring screws 626mm, center distance of inner ring screws 494mm, 20 mounting holes in a single circle, hole diameter 18mm, center distance of adjacent bolt holes in the outer ring 97.93 mm (77.93mm edge to edge)