High-Tin Bronze (CuSn10) Bearings for Ultra-High Cycle Cylinder Rotors
Engineering Overview: Metallurgical guide on CuSn10 phosphor bronze bearing sleeves and thrust washers extending rotational life in heavy commercial cylinders.
Technical & Engineering Specifications
| Cycle Life | 1,000,000+ Continuous Rotations |
|---|---|
| Alloy Grade | CuSn10 Phosphor Bronze (EN CW480K / C90700) |
| Load Capacity | Supports high radial and thrust pre-loads |
| Brinell Hardness | 160 - 180 HB |
| Friction Pairing | Optimal against stainless steel and leaded brass |
Managing Rotational Thrust Friction
Heavy commercial mortise latch springs apply continuous lateral thrust against the cylinder rotor neck. High-Tin Phosphor Bronze (CuSn10 / C90700) sleeves prevent galling.
Metallurgical Properties
- Tin Content (10% Sn): Promotes delta-phase micro-hardness (160 to 180 HB).
- Anti-Seize Lubricity: Natural dry lubricity prevents rotational galling over 1,000,000 operating cycles without requiring wet grease.
Frequently Asked Engineering & Selection Questions
Q1: Why is CuSn10 bronze used in commercial lock rotors?
Its 10% tin content provides high hardness and natural anti-seize lubricity, allowing lock cores to turn smoothly for 1 million cycles.