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S2907-4-3 – Textron Aviation OEM 1/8" Solid Structural Rivet
Available now on the Airparts.aero Marketplace.
Overview
The Textron Aviation S2907-4-3 is an OEM, flight-critical solid structural rivet used in the assembly and repair of Textron Aviation (Cessna and Beechcraft) airframes. This is not a blind or "pop" rivet; it is a fundamental aerospace fastener designed to create permanent, high-strength joints primarily loaded in shear. The S2907-4-3 features a 100° countersunk head, making it the specified fastener for attaching external skins to the underlying structure (spars, ribs, and stringers) where an aerodynamically clean, flush surface is required to minimize drag.
Manufactured from 2117-T4 aluminum alloy, this "AD" type rivet is engineered to be driven in the as-received condition without requiring complex pre-installation heat treatment. During installation, the rivet is "driven" or "bucked," a process that plastically deforms the tail to form a "shop head." This action causes the shank to swell, completely filling the hole and creating a powerful clamping force between the sheets of material. The integrity of an aircraft's structure is dependent on the quality and correct installation of thousands of these rivets, making the use of this traceable, OEM-certified part a non-negotiable requirement for airworthiness.
Key Features
OEM Certification: A genuine Textron Aviation part, guaranteeing conformity to the proprietary material, dimensional, and strength specifications required for their aircraft.
High Shear Strength: The solid 2117-T4 aluminum alloy shank provides exceptional shear strength, making it ideal for transferring loads through aircraft skin panels.
100° Countersunk Head: Designed for installation in a countersunk or dimpled hole, creating a perfectly flush surface for minimal aerodynamic drag.
Superior Clamping Force: The proper driving of this rivet creates a high-integrity, interference-fit joint that resists slippage and enhances structural rigidity.
Material Traceability: Fully traceable to the material batch and manufacturing lot, a fundamental requirement for any primary structural fastener.
Technical Specifications
Part Number: S2907-4-3
Component Type: Solid Structural Rivet
OEM Manufacturer: Textron Aviation
Head Style: 100° Countersunk (equivalent to AN426)
Shank Diameter: -4 (4/32" or 0.125 inches)
Grip Length: -3 (3/16" or 0.1875 inches)
Material: 2117-T4 Aluminum Alloy ("AD" type rivet).
Finish: Typically finished with a chemical conversion coating (Alodine) for corrosion resistance.
Governing Specifications: Manufactured to Textron Aviation's proprietary S2907 standard, which meets or exceeds the requirements of standards like NASM20426.
Aircraft Compatibility
Textron Aviation: Used across the product lines, including various Cessna and Beechcraft models, where specified by the engineering drawing, Illustrated Parts Catalog (IPC), or Structural Repair Manual (SRM).
Note: The application of a solid rivet is extremely specific. The correct material, diameter, and grip length must be used as called out by the official maintenance or repair documentation. Substitution is not permitted.
Applications
Airframe Skin Installation: Primary fastener for joining skins to stringers, ribs, and spars.
Structural Assembly: Used in the assembly of various airframe components, such as control surfaces, bulkheads, and fuselage sections.
Certified Structural Repair: The standard fastener for performing permanent, airworthy repairs on aircraft skin and structures in accordance with an SRM.
Why Choose S2907-4-3?
A solid rivet is the most basic and most critical component of a traditional semi-monocoque airframe. The safety of the aircraft is built upon the certified material strength and dimensional accuracy of these fasteners. Using a generic or untraceable rivet introduces an unacceptable risk of using the wrong alloy or temper, which could lead to brittle fracture during installation or shear failure in flight. The Textron Aviation S2907-4-3 is a fully certified and traceable OEM part, ensuring it is made from the correct 2117-T4 alloy and manufactured to the precise standards required to carry flight loads safely.
The engineering principle that makes the S2907-4-3 solid rivet a superior fastener for shear applications is the phenomenon of hole-filling, or obturation, achieved during the driving process. As the pneumatic rivet gun and bucking bar apply opposing forces, the rivet's tail is upset to form the shop head. This high-impact forging process causes the ductile 2117-T4 aluminum alloy shank to expand radially, completely filling any microscopic irregularities in the drilled hole. This creates a near-perfect interference fit. The result is a joint where the shear load is transferred through the rivet shank in pure bearing, with virtually no slippage. Furthermore, as the driven rivet cools from the slight temperature increase caused by the work-hardening process, it contracts, pulling the sheets together with a significant clamping force that further increases the joint's rigidity and fatigue life.
Note: The S2907-4-3 is a flight-critical fastener. Installation requires specialized skills and tooling, including a rivet gun, correctly sized rivet set, and a bucking bar. The installer must be a certified mechanic trained in sheet metal practices. The formed shop head must be inspected to ensure it meets the dimensional requirements (typically 1.5x shank diameter in width, 0.5x shank diameter in height) as defined in standard practice manuals like AC 43.13-1B or the aircraft's Structural Repair Manual.
Documentation
No public-facing OEM specification sheet was located for this proprietary part number. All installation techniques, hole preparation requirements, and inspection criteria are contained within the official Textron Aviation Structural Repair Manual (SRM) for the specific aircraft model and in standard aviation maintenance practice documents such as FAA AC 43.13-1B.
