419-594 – Piper Aircraft OEM Screw (AN530-10R36 Cross-Reference)
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Overview Section
The Piper Aircraft 419-594 is an Original Equipment Manufacturer (OEM) Screw used extensively across various Piper models, including the Cherokee, Archer, Dakota, and potentially the Seneca and Saratoga lines. The search results indicate that this Piper part number often cross-references directly to an industry-standard AN530-10R36 screw.1 This identifies the part as a common Sheet Metal Screw (Type A or B), likely featuring a Round Head (R) or Truss Head and a Phillips drive, used primarily for securing non-structural components such as fairings, inspection panels, trim, and interior components.
While non-structural, using the certified OEM or cross-referenced AN hardware is mandatory. The screw is manufactured from steel (ST) as noted in the parts data, ensuring sufficient strength and corrosion resistance for its airframe application, unlike commercial-grade fasteners.
Key Features Section
OEM Certified Quality: Manufactured to Piper Aircraft's specification, ensuring correct thread profile, material composition, and dimensional accuracy for safe replacement.
AN Cross-Reference: Often equivalent to AN530-10R36, classifying it as a Sheet Metal Screw (likely self-tapping Type A or Type B) with a Round Head (R) and Phillips drive.
Material: Fabricated from Steel (ST), providing superior shear strength compared to aluminum sheet metal screws.2
Non-Structural Application: Designed for securing non-load-bearing components where frequent access (e.g., inspection panels, interior trim) is required.
Corrosion Resistance: Typically plated (e.g., Cadmium or Zinc-Nickel) to resist corrosion, especially when installed in aluminum airframe structures.
Specific Dimensions: The NAS/AN cross-reference defines the exact size: 10 (screw diameter size), R (Round Head style), and 36 (length in 32nds of an inch, e.g., $36/32 \text{ inch}$ or $1 \text{ and } 1/8 \text{ inch}$ nominal length).
Technical Specifications Section
Part Number: 419-5943
OEM Manufacturer: Piper Aircraft, Inc.4
Component Type: Sheet Metal Screw / Fastener5
Cross-Reference: Often equivalent to AN530-10R366
Material: Steel (ST)7
Head Type: Round Head or Truss Head (Phillips Drive)
Thread Type: Sheet Metal Thread (Specific thread type must be confirmed via the AN standard, often Type A or B)
Nominal Size: No. 10 Diameter
Nominal Length: Must be confirmed by the final dash number (e.g., AN530-10R36 = $1 \text{ and } 1/8 \text{ inch}$ length)
Application: Securing Fairings, Panels, and Interior Trim.
Governing Specifications: Certified under FAA-PMA/OEM standards; conforms to applicable AN or MS fastener standards.
Aircraft Compatibility Section
Piper Cherokee Series: PA-28-140, PA-28-151, PA-28-161 (Warrior), PA-28-181 (Archer).
Piper Dakota: PA-28-236 (Dakota).
Piper Six Series: PA-32 series (Saratoga, Cherokee Six).
Piper Twins: May be used in various Twin Comanche or Seneca models.
Note: The application is highly specific. The aircraft's Illustrated Parts Catalog (IPC) is the final authority for verifying the exact part number and quantity required for a specific location (e.g., Cabin Door Assembly, Wing Walk Skin Assembly).
Applications Section
Securing Inspection Panels: Fastening removable access panels to the wings, fuselage, and tail surfaces.
Cabin Interior Trim: Attaching plastic or upholstered trim panels inside the cockpit and cabin.
Fairing Attachment: Fastening fiberglass or metal fairings (e.g., wheel pants, intersection fairings) to the airframe.
Why Choose the 419-594 (AN530-10R36)?
The 419-594 screw is essential for maintaining aircraft aerodynamic profile and inspection accessibility. Using a non-certified or incorrect screw risks: 1) Corrosion: An improperly plated steel screw can induce galvanic corrosion in the aluminum airframe; 2) Stripping: An incorrect thread profile or soft material can strip the existing pilot hole in the airframe, requiring costly repair; or 3) In-Flight Separation: A non-certified screw may fail under vibration, leading to the loss of panels or fairings, which can cause significant aerodynamic drag and potential damage to the control surfaces. The certified OEM/AN standard ensures the required material strength, thread engagement, and finish for its intended non-structural, high-vibration environment.
The proper use of the 419-594 (AN530-10R36) is governed by the principles of thread forming and fit. As a sheet metal screw, it is designed to tap its own mating thread into the pilot hole of the sheet material, creating an extremely tight, interference fit. The Phillips drive and round head are selected for ease of installation and removal, often by maintenance personnel. Since this is a steel screw installed in an aluminum airframe, the plating (e.g., Cadmium) is critical; it must serve as an anodic barrier, sacrificing itself to corrosion before the more expensive aluminum structure is damaged, a core principle of corrosion control in mixed-metal aerospace assemblies.
Note: The 419-594 screw is a non-structural component. When installing this screw, technicians must use a torque driver to ensure the sheet metal is not over-torqued and the threads in the airframe structure are not stripped. If the threads are stripped, the hole must be enlarged and repaired with a certified nut plate or equivalent repair procedure.
Documentation
Piper Aircraft Illustrated Parts Catalog (IPC): Required for definitive part number verification by assembly location.
AN530 Standard Specification: Details the exact dimensions, thread profile, and material for the cross-referenced part.