![]() Bolts that are designed to a manufacturer’s customized specs will have an “S” or “SPEC” stamped into the head, and should likewise only be replaced with their identical. A given bolt should only be replaced with its identical. ![]() These specs are determined by three standards that have evolved over time: AN (for Army-Navy), MS (Military Standard), and NAS (National Aerospace Standards). Other bolts feature internal wrenching designs.Īircraft-grade bolts are designed to meet standardized specifications of strength and size. Cross slot (PH) Cross Slot (PZ) Slot Special Screwdrivers T-Star (for Torx) T-Star tamperproof (for Torx). Hexhead bolts, naturally, feature a hexagonal head, whereas clevis bolts have a rounded flat-slot head, and NAS bolts, which meet a higher standard of tensile strength, often have a countersunk head. The most common types of aircraft bolts are hexhead, clevis, and NAS, which are distinguished mainly by their head designs. Most aircraft bolts are made from steel alloys or solid steel with a corrosion resistant plating (typically cadmium or zinc), though some bolts manufactured for specialized purposes are made from aluminum alloy or titanium. Aircraft bolts are used to fasten joints that require an amount of shear or tensile strength which screws cannot bear, and on components that may require occasional or frequent service where re-riveting or welding will compromise the strength of the joint. ![]()
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