S1853-4 – Textron Aviation Cessna OEM Straight Head Pin
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Overview
The Textron Aviation S1853-4 is a genuine OEM, flight-critical straight head clevis pin, a primary structural fastener engineered for use in various control linkages on a wide range of Cessna aircraft. This is not a standard hardware store pin; it is a precision-ground, high-strength steel component designed to act as a pivot point in a shear-loaded joint, most commonly in the flight control and landing gear systems. The S1853-4 features a thin, straight head for minimal protrusion and a cross-drilled hole for securing with a cotter pin. Its integrity is fundamental to the safe and reliable operation of the systems it is a part of.
As a genuine Textron OEM part, it guarantees the precise tolerances, certified material strength, and quality control required for a flight-critical application. Its design ensures a smooth, rotational pivot with minimal play, which is essential for the positive and accurate transmission of mechanical force in an aircraft system.
Key Features
Primary Control System Component: A critical fastener used to create pivotal joints in flight control systems (aileron, elevator, rudder, trim) and landing gear linkages. The pin is designed to carry high shear loads.
High-Strength Steel Alloy: Fabricated from a high-grade, heat-treated steel alloy. This provides the exceptional shear strength and fatigue resistance required to handle the constant, cyclical loads of a control system without failing.
Precision Centerless Grinding: The shank of the pin is precision centerless ground to an extremely tight dimensional tolerance. This ensures a perfect, snug fit in the mating clevis and rod end, eliminating "slop" or play in the control system.
Positive Locking Design: The shank is cross-drilled to accept a cotter pin. When used with a plain washer and cotter pin, this provides a positive mechanical lock, which is a mandatory safety feature that prevents the pin from backing out under vibration.
Corrosion-Resistant Plating: Plated with a durable cadmium finish to provide robust protection against corrosion, ensuring a long and reliable service life within the airframe structure.
Technical Specifications
Part Number: S1853-4
Component Type: Straight Head Clevis Pin
Material: High-Strength, Heat-Treated Steel Alloy
Finish: Cadmium Plated
Head Style: Straight Head (Low Profile)
Locking Provision: Cross-drilled shank for cotter pin.
Dimensions:
Nominal Diameter: 1/4 inch
Effective Length (Grip): Specific to the "-4" dash number, defined by Textron engineering drawings.
Certification: FAA Production Approval
Aircraft Compatibility
The S1853-4 is a standard hardware component used in numerous locations on a vast range of Cessna's most popular single and multi-engine aircraft. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification of its exact application.
Common Aircraft Models:
Cessna 150, 152
Cessna 172 Skyhawk
Cessna 182 Skylane
Cessna 206 Stationair
Cessna 210 Centurion
Cessna 310
Applications
The S1853-4 is a flight-critical fastener essential for the integrity of mechanical linkages:
Flight Control System Rigging: Used to connect push-pull tubes, control cables, and bellcranks throughout the aileron, elevator, and rudder systems.
Landing Gear Linkages: Serves as a key pivot pin in landing gear retraction and downlock mechanisms.
Trim System Actuation: Connects trim actuators to the trim tab linkages.
Why Choose S1853-4?
The failure of a clevis pin in a flight control system can result in a partial or total loss of control of the aircraft. The Textron Aviation S1853-4 is the only component certified by the manufacturer for this application. Using a genuine OEM part guarantees the pin has the specified material strength, heat treatment, and precise dimensions to prevent failure under load and to eliminate play in the controls. For any flight-critical linkage, there is absolutely no substitute for a genuine, fully traceable OEM part.
The S1853-4 clevis pin is specifically designed to function in a double-shear joint. In this configuration, the pin passes through a central rod end or tang and is supported on both sides by the two lugs of a clevis fitting. This arrangement places the pin in "double shear," meaning that for the joint to fail, the pin would have to be sheared through in two separate places. This design is significantly stronger and more reliable than a single-shear joint. The precision-ground shank of the S1853-4 ensures a tight fit in the holes of the clevis and the rod end, which is critical for preventing bearing stress on the holes and ensuring that the load is distributed evenly across the full cross-section of the pin. The positive lock provided by the cotter pin is the final layer of safety, ensuring the pin cannot vibrate out of this critical connection.
Note: This is a flight-critical flight control system component. Installation must be performed by a certified A&P mechanic in strict accordance with the current Textron Aviation (Cessna) maintenance manual. It must be secured with a new cotter pin of the correct size. A full flight control movement check is mandatory after installation of any control system hardware.
A headed, cylindrically-shaped item having a solid shank for fitting into corresponding holes, used for aligning or fastening. It may have welding projections. It also may contain holes drilled perpendicular to the axial centerline. Excludes pin, eccentric.
Used as a pin for Carburetor Airbox Assy.
**Cessna Aircraft Model 182 Skylane Illustrated Parts Catalog [ Click Here ]
See Page 219, Figure 65, Item 32