DPP / MDPP Series

Overview of DPP- / MDPP- Series Airframe Control Bearings

The DPP- / MDPP- Series represents a class of heavy-duty, double-row ball bearings designed to handle both radial and axial loads in high-stress aerospace environments. Their robust construction and engineered features make them ideal for mission-critical control mechanisms, including flap actuators, landing gear, and helicopter rotor systems.

Key Features and Technical Specifications

High-Grade Bearing Steel: The rings and balls are made from AISI 52100 chrome steel, offering excellent hardness, wear resistance, and fatigue life.
Temperature Resistance: Designed to operate within a wide temperature range from -65°F to +250°F (-54°C to +121°C), suitable for diverse flight conditions.
Integrated PTFE Seals: All bearings are equipped with nonremovable PTFE seals that provide long-term protection against contamination and moisture ingress.
Military-Grade Lubrication: Pre-lubricated with MIL-PRF-81322 grease to ensure reliable performance; standard fill is 80% unless otherwise specified.
Converging Contact Angles: Designed with “/” type converging contact angles to optimize load distribution and improve structural stiffness.
Corrosion-Resistant Plating: External surfaces (excluding bore) are cadmium plated per AMS-QQ-P-416, with all final dimensions applying after plating.

Customization Options

The DPP- / MDPP- Series bearings can be tailored to specific aerospace or industrial requirements. Available custom options include:

Non-standard outer diameters and bore sizes
Alternative materials (e.g., stainless steel or ceramic balls)
Special tolerances or internal clearance grades
Custom lubrication (including dry film or solid lube)
Alternate plating such as zinc-nickel or phosphate coatings

Dimensional Standards

Unless otherwise indicated, all measurements are provided in inches.
Dimensions reflect finished measurements after cadmium plating.

Applications in Aerospace and Beyond

Typical applications for the DPP- / MDPP- Series include:

Primary and secondary flight control systems
Hydraulic actuator pivots
Helicopter swashplate and rotor head assemblies
High-load linkage and bracket interfaces

Conclusion

Designed for superior load capacity, environmental protection, and long-term durability, the DPP- / MDPP- Series Airframe Control Ball Bearings are a trusted choice for OEMs, MRO providers, and aerospace engineers seeking dependable motion control under challenging conditions.