305806-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 305806-C-2Z model number is decoded

the 72 mm outside diameter is the crowned track contact surface, the 30 mm bore takes the pin and the 23.8 mm overall width spreads the Hertzian contact across the thick-walled outer ring published ratings C 25.1 kN and C0 16.3 kN already include the outer-ring bending correction that track rollers require; the C/C0 ratio of 1.54 reflects two ball sets at a 30 deg contact angle fatigue load limit Pu 0.695 kN against a 30 mm bore gives 0.84 kN per mm of bore, and the 5,000 r/min figure is a mechanical limit rather than a thermal one the maximum permissible radial loads are Fr 17 kN dynamically and F0r 24 kN statically; because the permissible static load is the lower of F0r and C0, the 16.3 kN figure governs static selection here the 23.8 mm width carries 1.05 kN per mm, the ring section measures 21.0 mm between bore and track surface, and 490 g over a 72x23.8 mm envelope is 0.286 g per mm2 of projected area for medium-speed cam duty dimensionally this is a 32 dimension series of double row angular contact ball bearings at 30 mm bore with a thick-walled outer ring pushed out to 72 mm (the base bearing measures 62 mm); the additional ring wall is what resists bending when the roller is unsupported in a housing at 30 mm bore this is the largest cam roller listed; the 23.8 mm width gives 25.1 kN dynamic capacity but the limiting speed drops to 5,000 r/min, so it suits slow, heavily loaded cams the 3058 prefix identifies the double row cam roller with a crowned running surface — the design to choose when the load path tends to tilt the roller axis relative to the track 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 crowned outer ring is ground to a 400 mm radius while the bore and width follow the standard 32-series envelope, so the roller can be swapped into an existing yoke without changing the pin or housing typical duties are food processing index conveyors, packaging machine timing cams and glass handling line guides this size is regularly specified for food processing index conveyors and packaging machine timing cams, where the 72 mm ring rides the cam profile and the 30 mm bore takes a g6 pin the two ball rows and the 23.8 mm wide ring make glass handling line guides a natural fit; the 490 g mass keeps the follower inertia low enough for rapid oscillating cam motion the crowned surface is ground at twice the Normal tolerance for its diameter; do not mix a 3058 ring with a 3057 flat ring in a matched pair relubrication is only possible through the inner-ring lubrication hole, which needs a matching duct in the pin; without that duct the roller is effectively sealed for life

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• the polyamide snap cage has a lower temperature ceiling than the steel ribbon cage — respect the lubricant and cage limits when the application runs hot
• the crowned surface is ground at twice the Normal tolerance for its diameter; do not mix a 3058 ring with a 3057 flat ring in a matched pair
• relubrication is only possible through the inner-ring lubrication hole, which needs a matching duct in the pin; without that duct the roller is effectively sealed for life