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HL20PB-6-19 – Textron Aviation OEM Pin
Available now on the Airparts.aero Marketplace.
Overview
The HL20PB-6-19 is a genuine OEM, flight-critical Hi-Lok pin, a key component of the high-strength, two-piece Hi-Lok fastening system. This fastener is engineered for use in the most demanding aerospace structural applications where a combination of high strength, light weight, and vibration resistance is required. The HL20PB-6-19 is precision-machined from 6AL-4V titanium alloy, offering a significant weight savings over steel bolts without compromising strength. It features a low-profile protruding shear head and is designed to be paired with a corresponding Hi-Lok collar to form a permanent, high-integrity structural joint.
Key Features
- 6AL-4V Titanium Alloy Construction: Fabricated from aerospace-grade 6AL-4V titanium alloy. This material provides an exceptional strength-to-weight ratio, excellent corrosion resistance, and the ability to withstand a wide range of temperatures, making it a superior choice for modern airframe construction.
- High-Strength, Lightweight Design: The Hi-Lok system is designed as a lightweight alternative to traditional nuts and bolts, and the use of a titanium pin maximizes this benefit. It provides the tensile strength of a bolt with the installation simplicity of a rivet.
- Protruding Shear Head: Features a compact, protruding shear-head design, which provides a balance between strength and a low-profile installation, minimizing aerodynamic drag in external applications.
- Controlled Preload System: When installed with a matching Hi-Lok collar (e.g., HL86 series), the collar's frangible hex shears off at a predetermined torque. This ensures that a precise and consistent clamping force (preload) is achieved on the joint, which is critical for fatigue life.
- Vibration Resistance: The high preload achieved during installation makes the completed fastener system extremely resistant to loosening under the severe vibration conditions of flight.
Technical Specifications
- Part Number: HL20PB-6-19
- Component Type: Hi-Lok Structural Pin
- Material (PB): 6AL-4V Titanium Alloy
- Head Style: Protruding Shear Head
- Nominal Diameter (-6): 3/16 inch (0.1875 inches)
- Grip Length (-19): 19/16 inches (1.1875 inches). This is the length of the unthreaded shank.
- Thread Specification: .1900-32 UNJF
- Installation Feature: Hex recess in the threaded end for anti-rotation during collar installation.
- Mating Collar: Requires a -6 diameter Hi-Lok collar (e.g., HL70, HL86 series).
Aircraft Compatibility
Hi-Lok fastening systems, and particularly lightweight titanium pins like the HL20PB-6-19, are used extensively in the primary and secondary structures of modern jet and turboprop aircraft, including those manufactured by Textron Aviation.
- Common Aircraft Platforms:
- Textron Aviation (Cessna & Beechcraft): Citation series business jets, King Air series, and other high-performance platforms.
- Universally used by other major airframe manufacturers like Boeing, Airbus, and Bombardier.
- Common Applications:
- Joining wing and fuselage skins to spars, ribs, and stringers.
- Assembling primary airframe structures and bulkheads.
- Attaching critical fittings and brackets where strength and low weight are paramount.
Applications
The HL20PB-6-19 pin is the specified fastener for creating permanent, high-strength structural joints:
- Fatigue-Critical Structures: The consistent and high preload achieved with the Hi-Lok system is essential for maximizing the fatigue life of critical structural joints.
- Weight-Sensitive Design: The use of titanium is a key strategy for engineers to reduce the overall weight of the airframe, which translates to increased payload or fuel efficiency.
- Automated & High-Volume Assembly: The controlled, consistent installation process makes it ideal for modern, high-precision aircraft manufacturing.
Why Choose HL20PB-6-19?
The strength and fatigue life of an aircraft structure are directly dependent on the quality of its fasteners. The Hi-Lok system is a proven technology that provides a level of precision and reliability that is superior to many older fastening methods. Using a genuine, traceable HL20PB-6-19 titanium pin ensures you are installing a component with the certified material strength and exact dimensional tolerances required for a safe, airworthy, and long-lasting structural joint.
Order Your HL20PB-6-19 Hi-Lok Pins Now
Build and repair your aircraft structure with the lightweight strength and precision of the Hi-Lok fastening system. Visit Airparts.aero to order your genuine HL20PB-6-19 titanium pins today.
The Hi-Lok fastening system, which includes the HL20PB-6-19 pin, is designed to be installed by a single operator from one side of the structure. During installation, a special tool with a concentric sleeve holds the Hi-Lok collar while an internal hex key passes through it to engage and hold the pin's recess, preventing it from rotating. As the tool tightens the collar, it stretches the high-strength titanium pin, creating a powerful clamping force on the structural members. When this preload reaches the designed value, the torque required to continue tightening exceeds the shear strength of the collar's thin-walled hex driver, which shears off cleanly. This unique installation method guarantees that the joint is tightened to the correct tension every time, removing guesswork and ensuring structural consistency.
Note: This is a flight-critical structural component. It must only be installed with the corresponding Hi-Lok collar of the correct diameter and material. The selection of the correct grip length is critical for proper installation. Installation requires specialized Hi-Lok tooling. The sheared-off hex portion of the collar is discarded.
