Cylindrical Iron Bushings FP20

Cylindrical FP20 sintered-iron bushings are plain self-lubricating journal bearings for radial shaft support without a collar. Like all oil-impregnated sintered bushes they carry their own lubricant within an interconnected pore network filled under vacuum; frictional heat and shaft rotation bring oil to the surface and capillary action returns it on cooling, so the bearing runs dry to the touch yet remains continuously lubricated without maintenance.

The FP20 iron matrix is harder and stronger than sintered bronze and comes at lower material cost, making these bushings an economical choice for slow-running, oscillating or shock-loaded duty and for use against hardened shafts. The range covers bores Ø3–Ø100 mm across 91 sizes, each specified by bore (Ø Int.), outside diameter (Ø Ext.) and length. Press-fit into a close-tolerance rigid housing and work to the fitted bore; avoid smearing the running surface during installation so the porosity — and the self-lubricating action — is preserved.

• Choose FP20 iron for higher load capacity, slow/oscillating motion, shock loading and hardened counterfaces; choose BP25 bronze for quieter, higher-speed or corrosion-sensitive service.
• Match Ø Int. to shaft plus clearance and Ø Ext. to the housing interference; use length to manage unit load.
• Bore span Ø3–Ø100 mm; where axial location is needed, see the flanged FP20 range.