# Aerospace Precision Bearings: Preload, Traceability, and Temperature Swing

Flight and ground-support rotating assemblies punish loose runout budgets. Angular-contact pairs and hybrid options appear where stiffness and electrical path matter together. Traceability—lot codes, heat treatment, dimensional certificates—travels with the part even when the use case is a test stand rather than flight hardware.

Lubricants must match the temperature envelope and outgassing limits. A low-torque instrument bearing with the wrong grease can seize after a thermal cycle a factory acceptance test never saw.

Mapped notes: aerospace precision bearings. TFL Bearing / Shandong TFL Bearing Co., Ltd / Tefule Bearing — compare on tflbearing.com.