80750-1612 – Specialized Aerospace Nut
Available now on the Airparts.aero Marketplace.
Overview
The 80750-1612 is a genuine OEM, self-locking, shear-type hexagon nut, engineered to proprietary Sikorsky Aircraft specifications for use in flight-critical helicopter airframe structures. This is not a standard tension nut; it is a specialized, lightweight fastener designed exclusively for use on bolts that carry loads in shear (perpendicular to the fastener's axis). Manufactured from high-strength, cadmium-plated steel, this nut provides a reliable, vibration-resistant locking action while offering significant weight savings over standard height nuts. As a genuine OEM part, it guarantees full conformance to the stringent design and quality standards required for rotary-wing aircraft.
Key Features
- Shear-Type Design: Features a reduced height and lighter weight compared to a standard tension nut (like an MS21044). It is specifically designed for shear applications where the bolt, not the nut, is intended to carry the primary structural load.
- Self-Locking Mechanism: Incorporates a prevailing torque locking feature, typically a deformed thread or an integrated locking collar. This ensures the nut resists loosening under the intense, multi-axis vibration characteristic of helicopter operations.
- High-Strength Steel Construction: Fabricated from a high-quality steel alloy, heat-treated to achieve the necessary strength to provide sufficient clamp-up force without thread stripping, while being optimized for weight.
- Corrosion-Resistant Plating: Plated with a durable cadmium finish, providing robust protection against corrosion and ensuring the fastener's long-term integrity in diverse operational environments.
- Genuine OEM Part: As a genuine part specified by Sikorsky, it guarantees the precise dimensions, material properties, and locking performance required for the specific structural joint it was designed for.
Technical Specifications
- Part Number: 80750-1612
- Component Type: Nut, Self-Locking, Hexagon, Shear Type
- Primary OEM: Sikorsky Aircraft
- Material: Steel, Cadmium Plated
- Finish: Cadmium Plated
- Thread Specification: 10-32 UNJF-3B
- Nominal Diameter: #10 (0.190 inches)
- Threads Per Inch: 32 (Fine Thread)
- Wrench Size: 5/16 inch
- Height: Reduced height (Shear Type)
Aircraft Compatibility
The 80750-1612 is a proprietary nut for specific applications on Sikorsky helicopters. Its use is mandatory as per the manufacturer's documentation and it is not interchangeable with standard AN/MS nuts.
- Common Helicopter Platforms:
- Sikorsky S-76
- Sikorsky UH-60 Black Hawk and its derivatives (S-70)
- Specific Applications: Used in secondary structural joints, system and component mounting, and various airframe assemblies where the primary loads are in shear. Verification against the aircraft's Illustrated Parts Catalog (IPC) is essential.
Applications
This specialized nut is used where its specific design characteristics are required:
- Shear-Loaded Joints: The only appropriate nut for use on a bolt in a true shear application, where achieving a light "snug-tight" condition is sufficient and the full tensile strength of the bolt is not required to be developed by the nut.
- Weight-Sensitive Assemblies: Its lightweight design makes it ideal for applications where minimizing weight is a critical design driver without compromising the security of the joint.
- Securing Control System Brackets & Components: Often used to attach brackets and system components to the primary airframe structure.
Why Choose 80750-1612?
The engineering of a helicopter involves a meticulous balance of strength and weight. A shear nut like the 80750-1612 is an engineered solution that provides a secure, self-locking fastening for a shear bolt while saving critical weight compared to a full-height tension nut. Using a genuine Sikorsky OEM part is the only way to ensure the fastener has the correct, certified material properties and locking characteristics for the joint. Substituting a standard tension nut could alter the designed failure mode of the joint, while using a non-approved part risks failure from vibration. For flight-critical hardware, there is no substitute for the OEM part.
Order Your 80750-1612 Nuts Now
Ensure the structural integrity and safety of your aircraft with genuine, fully traceable OEM hardware. Visit Airparts.aero to order your 80750-1612 proprietary nuts today.
A shear nut is deliberately designed to be weaker in tension than the bolt it is threaded onto. In a shear joint, the primary load is transferred by the shank of the bolt bearing against the sides of the hole. The nut's function is simply to keep the bolt from falling out and to provide a light clamping force. By using a reduced-height shear nut, designers ensure that in an over-torque situation, the nut's threads will strip before the structurally critical bolt is stretched past its elastic limit or broken. This creates a predictable and safer failure mode. The 80750-1612 is precisely engineered to provide sufficient clamping force for its intended application while adhering to this critical shear-nut design philosophy.
Note: This is a flight-critical structural component. It must only be used in the application specified by the Sikorsky maintenance and parts manuals. Installation requires the use of a calibrated torque wrench and adherence to all specified procedures. Do not substitute with a standard-height tension nut unless explicitly authorized.
