Super-TF Spherical Roller Bearings for Main Shafts

NSK’s Super-TF (STF) spherical roller bearings for main shafts support immense and continuous dynamic wind loads while rotating at ultra-low speeds. Through advanced material technologies and manufacturing process controls, STF bearings are built to endure severe mechanical stresses with superior wear resistance to deliver high-capacity performance for a long and reliable service life.

Super-TF Spherical Roller Bearings for Main Shafts

Design Features

  • Ultra-large spherical roller bearing with optimized, high-capacity internal design
  • Bearing rings manufactured with long-life Super-TF alloy composition and carbonitriding process
  • Rollers are treated with wear-resistant diamond-like coating (DLC)
  • Heavy duty, precision machined two-piece brass cage
  • Controlled raceway surface finish process for main shaft applications
  • Outer ring lubricating groove with optimized size and quantity of lubricating holes
  • Special / custom radial internal clearance
  • Dimension series 230 and 241; additional types available on request
  • For shaft diameters ranging from 500 mm and larger

Operating Benefits

  • Super-TF steel promotes longer life with dramatically increased resistance to wear and seizure
  • Special roller surface treatment - DLC coating - increases roller toughness and endurance
  • Heavy-duty two-piece cage design delivers superior performance in applications subject to heavy and/or impact loading
  • Superior ring grinding technology for controlled raceway surface finish, in conjunction with optimized roller-to-raceway profiles, controls roller motion within the bearing, reducing bearing wear and improving bearing fatigue life