305704-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 305704-C-2Z model number is decoded

the 52 mm outside diameter is the crowned track contact surface, the 20 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 16.5 kN and C0 9.5 kN already include the outer-ring bending correction that track rollers require; the C/C0 ratio of 1.74 reflects two ball sets at a 30 deg contact angle fatigue load limit Pu 0.4 kN against a 20 mm bore gives 0.82 kN per mm of bore, and the 7,000 r/min figure is a mechanical limit rather than a thermal one the maximum permissible radial loads are Fr 8.3 kN dynamically and F0r 12 kN statically; because the permissible static load is the lower of F0r and C0, the 9.5 kN figure governs static selection here the 20.6 mm width carries 0.80 kN per mm, the ring section measures 16.0 mm between bore and track surface, and 220 g over a 52x20.6 mm envelope is 0.205 g per mm2 of projected area for medium-high-speed cam duty the 20 mm bore and 20.6 mm width are those of the 32 series ball bearing at the same size code, while the 52 mm outside diameter is 5 mm larger than that bearing's 47 mm OD — this follows the SKF rule that cam rollers keep the ISO 15 dimension series except for the outside diameter the 20 mm bore places this in the medium band where the thick-walled outer ring is deep enough to carry 16.5 kN without excessive edge stress on the track the 3057 prefix identifies the cylindrical running surface option of the double row cam roller, for guides and tracks that are machined and aligned accurately enough not to need the crown's misalignment tolerance because there are two ball rows, this roller accepts noticeably higher tilting moments than a single row cam roller of the same outside diameter; the trade is a larger section and a lower limiting speed the running surface here is cylindrical (flat), so the contact geometry assumes a well-aligned track; any angular misalignment between the roller axis and the guide surface moves the load straight onto the ring edges typical duties are packaging machine timing cams, glass handling line guides and cam drives and indexing mechanisms this size is regularly specified for packaging machine timing cams and glass handling line guides, where the 52 mm ring rides the cam profile and the 20 mm bore takes a g6 pin the two ball rows and the 20.6 mm wide ring make cam drives and indexing mechanisms a natural fit; the 220 g mass keeps the follower inertia low enough for rapid oscillating cam motion relubrication depends on the inner-ring lubrication hole and a drilled pin; if neither is provided, grease replacement needs the roller dismantled from the yoke 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

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• 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
• relubrication depends on the inner-ring lubrication hole and a drilled pin; if neither is provided, grease replacement needs the roller dismantled from the yoke
• 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