STD-2169 - Lycoming Engines OEM Roll Pin .188 X 1.13 Long

STD-2169 – Lycoming Engines OEM Roll Pin .188 X 1.13 Long

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Overview

The Lycoming STD-2169 is a genuine OEM slotted spring pin, commonly known as a roll pin, engineered for specific applications within Lycoming reciprocating engines. This is not a generic hardware item; it is a precision-manufactured fastener designed to secure, align, or act as a stop for various components in the engine. Fabricated from a high-quality spring steel alloy, the STD-2169 is designed to be compressed during installation into a slightly smaller hole. The constant outward spring pressure it exerts against the hole wall creates a strong, vibration-resistant friction fit that holds it securely in place.

Key Features

• Spring Steel Construction: Manufactured from a high-carbon or stainless spring steel alloy, heat-treated to provide a combination of strength and flexibility. This allows the pin to be compressed during installation and maintain constant radial force.
• Vibration Resistance: The inherent outward spring pressure makes roll pins extremely resistant to loosening or backing out under the intense vibration of engine operation, providing a more secure hold than a solid dowel pin in many applications.
• Precise Dimensions: Manufactured to exacting tolerances to ensure the correct interference fit. The pin's uninstalled diameter is intentionally larger than the nominal hole size to guarantee the required spring tension.
• Shear Load Capacity: Designed to withstand specific shear loads, acting as a durable stop or a secure fastener for components such as the starter ring gear support on certain engine models.
• Genuine Lycoming OEM Part: As a genuine factory part, it guarantees conformance to Lycoming's stringent material, heat treatment, and dimensional specifications, ensuring the highest level of safety and airworthiness.

Technical Specifications

• Part Number: STD-2169
• Component Type: Slotted Spring Pin (Roll Pin)
• Material: High-Carbon or Stainless Spring Steel
• Finish: Plain or with a protective oil/phosphate coating
• Nominal Diameter: 3/16 inch (0.1875 - 0.188 inches)
• Length: 1-1/8 inches (1.125 - 1.13 inches)
• Installation Method: Press-fit / Hammer-fit into a drilled hole.

Engine Compatibility

The Lycoming STD-2169 is used in several specific applications across a range of Lycoming engine models. It is critical to consult the specific engine's Illustrated Parts Catalog (IPC) to verify the correct part number and its application.

• Known Applications:
  • Starter Ring Gear Support: Used as a stop pin or locating pin for the starter ring gear support assembly on the crankshaft flange of many direct-drive engines.
  • Accessory Case Components: May be used in various locations within the accessory housing to align or secure shafts and gears.
• Common Engine Series:
  • O-320, IO-320
  • O-360, IO-360
  • O-540, IO-540

Applications

The STD-2169 roll pin is an engineered fastener for specific mechanical needs:

• Component Retention: Used to securely fasten one component within another, relying on radial friction.
• Alignment and Location: Serves as a dowel to ensure the precise alignment of two or more mating parts during assembly.
• Mechanical Stop: Acts as a solid stop to limit the travel of another component.

Why Choose STD-2169?

The material properties of a roll pin—its spring tension, shear strength, and fatigue life—are critical, especially within an aircraft engine. Using a genuine Lycoming STD-2169 OEM pin guarantees that the fastener has been subjected to the proper heat treatment and is made from the correct alloy to perform its function reliably for thousands of hours. Substituting with a non-certified industrial roll pin can introduce a part with unknown strength and material characteristics, risking shear failure or loosening from vibration, which could lead to significant engine damage. For a professional, airworthy repair, trust only genuine Lycoming hardware.

Order Your STD-2169 Lycoming Roll Pins Now

Ensure every component in your engine assembly meets factory specifications. Visit Airparts.aero to order your genuine Lycoming STD-2169 roll pins today.

The STD-2169 slotted spring pin is a self-retaining fastener that functions by converting radial compression into a continuous outward force. When driven into a hole of a slightly smaller diameter, the slot allows the pin to compress. The material's elastic properties then attempt to return the pin to its original diameter, creating constant pressure against the hole wall. This pressure provides the frictional force that holds the pin in place, making it highly effective in high-vibration environments where solid pins could walk out. The shear strength of the pin is determined by its wall thickness and the properties of the spring steel alloy from which it is made, a specification strictly controlled by Lycoming for genuine OEM parts.

Note: Installation of this component must be performed by a certified A&P mechanic in accordance with the current Lycoming Overhaul or Parts Manual for the specific engine model. Ensure the receiving hole is clean, free of burrs, and correctly sized. Always use appropriate punches and support for installation to avoid damaging the pin or the surrounding components.