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Anchor nuts (aka nutplates or anchor plates) are terms used interchangeably and relate to stamped sheet metal fasteners with an internally threaded tube and a plate with two clearance holes for rivets. They are used in blind mounted panel applications in aerospace and other industrial sectors where hex nuts cannot be used or an attached nut is required for ease of maintenance.
Anchor nuts can be Fixed or Floating, the latter being easier to use due to their built-in nut (threaded hole) able to "float" slightly thus providing a convenient connection point for threaded rods, such as bolts, from the backside. In the case of Fixed anchor nuts, the built-in nut is static (i.e. without the capability to “float”) and the threaded rod must be positioned perfectly over the hole. Self-locking anchor nuts are those with a built-in locking mechanism preventing them from loosening over time from vibrations. They are extensively used in aerospace, automotive, and construction industries.
Depending on their intended application, nutplates conform to different military, aerospace, ISO or other industrial standards such as the German DIN, U.S. (ASME & ASTM, IFI, ANSI), British BS, Japanese JIS and others. They are offered as OEM parts under their respective brands or under our own labelled (AVIATIONEU NEW ERA) product lines intended as cost-effective alternatives to the respective OEM products. Listed in accordance with their standard of compliance, Fixed and Floating nutplates come in different materials (such as steel or CRES & finishes), in single/double lug configurations and Metric ISO οr Unified thread sizes. There is currently no U.S. Military Standard (MS) specification for Metric nutplates. Depending on the selected product and availability, nutplates can be supplied with a dry film lube specified by the letter "L" in the respective part number. Those with countersunk rivet holes are specified by the letter "K" at the end of the part number.
Sourced from quality manufacturers, AVIATIONEU NEW ERA MS21048/NAS680 series nutplates are fixed self-locking, two-lug low height nutplates made from Corrosion Resistant Steel (CRES) A286 (UNS S66 286) in 450° & 800° F versions with a passivated finish. Same as those of MS21047series except that they are made from stainless steel and silver plated (800 ° F only). They have a nylon insert and are available in different Unified thread sizes, with plain rivet or countersunk rivet holes on each side and come with or without a dry film lubricant (450° F only). MS21048 nutplates supersede AN362, AN366, NAS680 and they are superseded by NASM21048 series. The Part Identification Number (PIN) for MS21048 and the part number for NASM21048 are identical & part numbers have not been changed. Sold in packs with a specified number of nuts per pack indicated after the letters "PK" in the product reference number (SKU). Matching rivets are sold separately. For additional information please contact us.