![]() The bolt reduces the need for tools and comes in eight different basic shank diameters ranging from 0.181 to 0.746 inches. The Slic Pin is ideal for holes with limited access for placing cotter pins. The plunger retracts when inserted into the stack up and once clear, springs up and locks into place. Slic Pin, designed by Pivot Point Inc., employs a spring-loaded plunger to replace the nut and cotter pin. The most common method is to use a cotter pin, which gets inserted right behind the nut to help keep the nut and bolt in place. Thus, secondary retention methods are used to ensure the bolt stays engaged. However, due to vibration and corrosion, nuts may un-torque or crack and fall off. The diameter range of the pin is 5/32 through 7/16 inches. Weight savings vary depending on pin diameter, head style, grip length, and other factors, but range from about 7% to 20% compared to other fastening systems. The reduced runout length enables an overall shorter pin length, thereby saving weight. Thread runout length is one pitch-shorter than the two-pitch runout of conventional threaded pins and even the 1.5-pitch runout of other lightweight threaded systems. The protrusion is measured from the gage block surface to the top of the head to ensure that top of the fastener is properly flushed. A concentric through hole on the gage block is sized to fit the fastener shank to prevent misalignments during gaging. head surface at a gage diameter located on the head angle. A元31’s dome-head protrusion gaging system incorporates a precision gage block that locates on the 100-deg. Developed jointly with the Boeing Company for use on the 737-700 wing, the pin helps improve the cosmetic of the wing, keeping the surface flat and uniformed, and providing a smooth surface for improved aerodynamics. The pin has an A元31 close-tolerance flush-head design. The Aero-Lite pins, which have a flush head for a smoother surface finish, consist of titanium material. ![]() The Aero-Lite Pin comes in a variety of sizes, depending on the stackup requirements. ![]() The hex-drive recess in the tail of the pin enables final installation of a nut or collar from one side of the structure, for use on assembly of wing skins and fuselage skins. The Aero-Lite pin is typically used on carbon fiber-intensive aircrafts in the wings section. The fastener is a threaded pin designed for use in a variety of applications from the nose to the tail of aircraft structures. Aero-Lite is a lightweight titanium alloy, hex-drive recess pin rated at 95 ksi ultimate shear strength. takes advantage of the material in its Aero-Lite threaded fasteners. Operating temperature range for titanium is –350 to 800☏.Īlcoa Inc. Titanium is also more corrosion-resistant than alloy steel, and in most cases, does not require protective coating. Titanium’s popularity stems from the fact that it’s half the weight of medium alloy steel, but retains the same strength. Virgin Atlantic Airlines estimates that a one-pound reduction on every aircraft across their fleet would result in fuel savings of 14,000 gallons per year. ![]() In attempts to create lighter and more fuel efficient aircraft, aviation companies have turned to materials and adhesives instead of using metal components. According to a recent report from market-research firm Lucintel, aerospace-adhesive usage should increase by 3.4% by 2020. As a result, many fasteners use lightweight materials like titanium, or have extra security features to prevent them from becoming loose and keep them in place even after losing torque.Īerospace nuts and bolts have been the industry standard, but adhesive alternatives are very popular among aerospace manufacturers because they can provide the same strength and security at virtually no weight impact. Aerospace fasteners follow strict guidelines and regulations: They must be secure to prevent pieces from disassembling, strong as to not shear when forces act upon them, yet be lightweight to help reduce aircraft weight and increase efficiency. ![]() The Boeing Company’s 747 includes over 6 million parts, half of which are fasteners. This file type includes high resolution graphics and schematics when applicable. ![]()
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