ضریب سرعت یاتاقان n×d_m ماشین‌حساب

It is rotational speed n multiplied by mean bearing diameter d_m=(d+D)/2. It is a useful speed parameter, not a universal permission limit.

No. Use current manufacturer data for the exact bearing, cage, seals, load, temperature and grease.

No. Lubrication selection also needs load, temperature, viscosity, grease performance, replenishment and thermal design.

Use reference and limiting speeds for the exact bearing designation and execution in its current product table.

No. It omits load, minimum load, cage stress, film thickness, clearance, sealing, alignment and rotor critical speed.