MS20392-1C41 - Textron Aviation OEM Straight Headed Pin

MS20392-1C41 – Textron Aviation OEM Straight Headed Pin (Clevis Pin)

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Overview

The MS20392-1C41 is a mil-spec, straight-headed pin, commonly known in the industry as a clevis pin, which has been specified by Textron Aviation for a precise application within their aircraft. This is not a generic hardware store pin; it is a precision-manufactured fastener designed to act as a semi-permanent shear pin in control linkages, clevis fittings, and various mechanical assemblies. Its purpose is to create a pivoting joint that securely connects two or more components while allowing for angular motion. The pin is secured in place by a cotter pin (sold separately) installed through the cross-drilled hole in its shank.

This particular pin is defined by its material—corrosion-resistant steel—and its unique, high length-to-diameter ratio. It is engineered for very specific, low-load applications where it may function as a hinge, an alignment dowel, or a connector in a non-primary-structural linkage. The use of a fully certified, OEM-specified MS20392-1C41 is critical to ensure the correct material properties, dimensional tolerances, and integrity of the assembly as intended by the airframe manufacturer.

Key Features

• Mil-Spec Certified: Manufactured in strict accordance with the MS20392 military standard, ensuring absolute conformity and quality.

• Corrosion-Resistant Steel: Fabricated from Type 303 stainless steel ("C" code), providing excellent corrosion resistance for long service life.

• Passivated Finish: Chemically passivated to remove surface contaminants and enhance the formation of a protective chromium-oxide layer, further inhibiting corrosion.

• Precision Machining: Machined to extremely tight diametrical and length tolerances for a perfect, slop-free fit in close-tolerance holes.

• OEM Specified: Selected by Textron Aviation for a specific application, guaranteeing it meets all engineering requirements for that joint.

Technical Specifications

• Part Number: MS20392-1C41

• AN Number: AN392-41

• Component Type: Pin, Straight, Headed (Clevis Pin)

• OEM Designator: Textron Aviation

• Standard: MS20392

• Diameter (-1): 1/16 inch (0.0625")

• Material (C): Corrosion-Resistant Steel (CRES), Type 303 (UNS S30300)

• Grip Length (-41): 41/16 inches (2-9/16" or 2.5625")

• Finish: Passivated per AMS2700 or equivalent.

• Securing Provision: Cross-drilled hole for a 1/32" cotter pin (e.g., MS24665 series).

  
  

Aircraft Compatibility

• Textron Aviation: Used on various Cessna and Beechcraft models where specified by the engineering drawing, Illustrated Parts Catalog (IPC), or maintenance manual for a specific, low-load application.

Note: The application of a clevis pin is extremely specific. The correct diameter and grip length must be used as called out by the official documentation. Substitution with a non-certified part is strictly prohibited.

Applications

• Control System Linkages: Connecting push-pull tubes to bellcranks or control horns in secondary flight control systems (e.g., trim tabs).

• Mechanical Assemblies: Serving as a pivot or hinge pin in landing gear mechanisms, access panels, or other mechanical systems.

• Low-Load Shear Joints: Designed to carry loads perpendicular to the shank (shear), not in tension (pulling).

Why Choose MS20392-1C41?

Even the smallest piece of hardware on an aircraft is flight-critical. The MS20392-1C41 is a certified component with guaranteed material composition (CRES 303), finish (passivation), and dimensional accuracy. Using a generic, non-certified pin from a hardware store introduces immense risk. Such a part would lack the required corrosion resistance, could have incorrect dimensions leading to a loose and vibrating joint ("control slop"), or could be made from an unknown material with insufficient shear strength. This could lead to a failure of a control linkage or mechanical assembly. Sourcing a fully traceable, OEM-specified pin is a fundamental requirement for airworthy maintenance.

The material science behind the MS20392-1C41's "C" designation is a deliberate engineering choice. It specifies Corrosion-Resistant Steel (CRES) Type 303, which is an austenitic stainless steel from the 300 series. While many 300-series alloys are known for their toughness, Type 303 is specifically formulated with added sulfur to make it a "free-machining" grade. This is critical for manufacturing small, high-precision components like this pin, as it allows for faster machining speeds and a better surface finish. However, the sulfide inclusions can be potential corrosion initiation sites. To counteract this, the pin undergoes a crucial chemical passivation process, typically in a nitric acid bath per AMS2700. This process removes free iron and sulfide particles from the surface and promotes the formation of a dense, inert, and self-healing chromium-oxide passive film, ensuring the pin's long-term corrosion resistance in the aerospace environment.

Note: The MS20392-1C41 is a shear fastener and must be installed in a properly sized, reamed hole. It must be secured with the correct diameter cotter pin, which should be installed and bent in accordance with standard practices (e.g., AC 43.13-1B). Never use this pin in an application where it will be subjected to significant tensile (pulling) or bending loads.

Documentation

• MS20392 Standard: The military standard sheet (e.g., NASM20392) defines all dimensional, material, and finish requirements for this series of pins and is publicly available through various online mil-spec libraries.

MS20392-1C41 Part Specifications: 

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