AN525-832R5 – Aerospace Screw
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Overview
The AN525-832R5 is a specialized, military-standard washer head screw designed for a variety of non-structural applications in aircraft and aerospace equipment. The "AN" designation signifies that it is manufactured in accordance with the rigorous Air Force/Navy Aeronautical Standard, ensuring a high level of quality control, material integrity, and dimensional accuracy. This screw features an integral washer face as part of its head, which provides a larger bearing surface to distribute clamping force and protect the mating surface from damage. It is a workhorse fastener found throughout aircraft interiors, cowlings, inspection panels, and avionics installations.
Key Features
- Integral Washer Head: The defining feature is a built-in washer face, which increases the load-bearing area under the head. This design prevents marring of soft materials like aluminum and composites and provides a more secure clamp than a standard pan head screw.
- AN Standard Certified: Manufactured and certified to the AN525 standard, guaranteeing traceability and conformance to military-grade material and manufacturing specifications.
- Cadmium Plating: Typically plated with cadmium for excellent corrosion resistance, a critical feature for hardware used in the demanding and often humid aviation environment. The plating also provides lubricity for consistent torque application.
- Cross-Recess Drive: Features a standard Phillips (cross-recess) drive, allowing for easy installation and removal with common aviation tools.
- High-Strength Alloy: Made from a high-strength steel alloy, ensuring it can withstand the vibration and incidental loads it is likely to encounter in service without failure.
Technical Specifications
- Standard: AN525 (Screw, Washer Head, Cross-Recessed, Coarse/Fine Thread)
- Full Part Number: AN525-832R5
- Material: Steel Alloy
- Finish: Cadmium Plated
- Head Style: Washer Head
- Drive Type: Phillips / Cross-Recess
- Thread Specification: 8-32 UNC-2A
- Nominal Diameter: #8 (0.164 inches)
- Threads Per Inch: 32 (Coarse Thread)
- Length (R): 5/16 inches (0.3125 inches), measured from under the head.
Aircraft Compatibility
The AN525-832R5 is a ubiquitous fastener and is not specific to a single aircraft model. It is used across the entire spectrum of general aviation, commercial, and military aircraft wherever a washer head screw of its size and material is specified by the manufacturer's parts catalog or structural repair manual.
- Common Applications:
- Securing inspection panels and fairings.
- Mounting instruments and avionics trays.
- Fastening interior components, placards, and upholstery panels.
- Assembling brackets and light-duty structural supports.
Applications
The AN525-832R5 is designed for specific fastening scenarios:
- Non-Structural Joints: Ideal for joints where high tensile or shear strength is not the primary requirement, but secure clamping and surface protection are needed.
- Soft Material Assembly: The washer head is perfectly suited for fastening components to aluminum sheets, composite panels, and plastic trim without causing damage.
- Vibration Resistance: When properly torqued, the large bearing surface helps resist loosening due to engine and airframe vibration.
Why Choose AN525-832R5?
In aviation maintenance, using certified hardware is not optional—it is a fundamental requirement for airworthiness. Choosing a genuine AN525-832R5 screw guarantees you are using a fastener with a known material pedigree, correct dimensions, and proper protective plating. Substituting with a non-certified commercial-grade screw can lead to premature corrosion, failure from vibration, or damage to the surrounding structure. For A&P mechanics and aircraft builders, relying on certified AN hardware is the only way to ensure a safe, reliable, and professional repair or assembly.
Order Your AN525-832R5 Screws Now
Stock your bins with the certified, high-quality hardware your aircraft requires. Visit Airparts.aero to order your AN525-832R5 washer head screws today.
The AN525 screw standard was developed to provide a reliable fastening solution with enhanced surface clamping capabilities. The integrated washer head design is a key differentiator from a standard AN515 (round head) or AN520 (pan head) screw. This design effectively combines the function of a screw and a washer into a single component, which simplifies assembly, reduces part count, and ensures that a bearing surface is always present. The 8-32 UNC thread specification denotes a "Unified National Coarse" thread, which is known for its rapid fastening and resistance to cross-threading, making it ideal for the service and maintenance environment of aviation.
Note: Always verify the correct screw part number (including material, thread size, and length) from the applicable aircraft maintenance manual or Illustrated Parts Catalog (IPC). Use the correct size Phillips driver bit to avoid stripping the recess. Torque values should be referenced from standard aviation maintenance handbooks (like AC 43.13-1B) unless a specific value is provided by the airframe manufacturer.