305705-C-2Z bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 14 cam rollers) · extracted 2026-10-14

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 14 cam rollers); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.

How the 305705-C-2Z model number is decoded

the 62 mm outside diameter is the crowned track contact surface, the 25 mm bore takes the pin and the 20.6 mm overall width spreads the Hertzian contact across the thick-walled outer ring published ratings C 18.6 kN and C0 11.8 kN already include the outer-ring bending correction that track rollers require; the C/C0 ratio of 1.58 reflects two ball sets at a 30 deg contact angle fatigue load limit Pu 0.5 kN against a 25 mm bore gives 0.74 kN per mm of bore, and the 6,000 r/min figure is a mechanical limit rather than a thermal one the maximum permissible radial loads are Fr 15.3 kN dynamically and F0r 21.6 kN statically; because the permissible static load is the lower of F0r and C0, the 11.8 kN figure governs static selection here the 20.6 mm width carries 0.90 kN per mm, the ring section measures 18.5 mm between bore and track surface, and 320 g over a 62x20.6 mm envelope is 0.251 g per mm2 of projected area for medium-speed cam duty the 25 mm bore and 20.6 mm width are those of the 32 series ball bearing at the same size code, while the 62 mm outside diameter is 10 mm larger than that bearing's 52 mm OD — this follows the SKF rule that cam rollers keep the ISO 15 dimension series except for the outside diameter the 25 mm bore places this in the medium band where the thick-walled outer ring is deep enough to carry 18.6 kN without excessive edge stress on the track the 3057 designation marks the cylindrical running surface variant — a flat ring profile that suits precision machined guide rails and linear tracks rather than stamped or welded cam plates the 30 deg contact angle of the two ball sets is what gives the double row roller its tilting stiffness — under a moment load the rows react in opposite directions instead of unloading one edge of the ring the 2Z suffix means sheet steel shields on both sides rather than elastomeric seals: they keep coarse debris out but will not retain a grease fill as tightly as the NBR contact seals of the single row roller typical duties are tube and wire drawing guides, material handling lift tracks and paper converting web guides this size is regularly specified for tube and wire drawing guides and material handling lift tracks, where the 62 mm ring rides the cam profile and the 25 mm bore takes a g6 pin the two ball rows and the 20.6 mm wide ring make paper converting web guides a natural fit; the 320 g mass keeps the follower inertia low enough for rapid oscillating cam motion the flat running surface assumes an accurately aligned track; angular misalignment between the roller axis and the guide surface puts the whole load onto the ring edges the cylindrical ring offers no crown relief, so any track crown, deflection or parallelism error shows up directly as edge stress and shortened ring life

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• like every double row cam roller the design prefers radial and tilting load; sustained axial thrust on the outer ring is outside the intended duty and shortens service life
• the flat running surface assumes an accurately aligned track; angular misalignment between the roller axis and the guide surface puts the whole load onto the ring edges
• the 2Z shield keeps coarse debris out but is not a contact seal, so fine abrasive dust in a wash-down environment can still reach the ball rows