McFarlane MS21251-B6L Turnbuckle Barrel (Brass) is a precision aircraft hardware component designed for use in turnbuckle assemblies that provide accurate tension adjustment in flight control cable systems. Manufactured to MS21251 military specifications, this brass barrel serves as the central adjustment body, allowing connected left-hand and right-hand threaded terminals to be simultaneously adjusted for precise cable rigging.

The turnbuckle barrel plays a critical role in maintaining proper control cable tension, ensuring accurate control surface movement and dependable aircraft handling. Its internal threads are precision-machined to provide smooth adjustment while securely engaging compatible turnbuckle terminals. Once the desired cable tension is achieved, the assembly is secured using an approved locking clip or safetying method to prevent unintended rotation during operation.

Manufactured from high-quality brass, the barrel offers excellent corrosion resistance, smooth thread engagement, and long service life in demanding aviation environments. The material also minimizes thread galling while providing reliable performance through repeated rigging and maintenance procedures.

Routine maintenance should include inspection of the barrel for thread condition, corrosion, deformation, and proper safetying to ensure continued airworthiness and reliable operation of the aircraft control cable system.

Key Features

- Part Number: MS21251-B6L
- Manufacturer: McFarlane Aviation
- Component: Turnbuckle Barrel (Brass)
- Specification: MS21251 military standard
- Material: Brass
- Application: Aircraft flight control cable turnbuckle assembly
- Precision-machined internal threads for smooth and accurate cable tension adjustment
- Excellent corrosion resistance and reduced thread galling
- Designed for reliable long-term performance in aviation cable rigging systems