The Howmet Aerospace FlatBeam™ locknut has a unique design that provides significant performance advantages over conventional all-metal crimped locknuts. With reuse capability of up to 250 seated cycles, the FlatBeam™ locknut has up to 16 times the life of other locking nuts, making this the ideal choice for applications with high-reuse requirements such as access panels.
The design utilizes six flexible flat beams. These beams provide critical prevailing torque on the bolt without placing abnormal wear on bolt threads. Both the nut and the bolt maintain tangential contact points so that the beam corners avoid contact with the bolt. This prevents destructive shaving of the bolt's threads and adds considerably to the life of the bolt as well as the locknut.
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The Howmet Aerospace FlatBeam™ locknut is available in thread sizes ranging from .1640"(08) to .375" (6). One and two lug options are available as well as nutplate assemblies with replaceable nut elements for cycle life requirements greater than 250. Nutplates are available in alloy steel and CRES materials, with various finishes. Configurations with domed shells, reduced rivet spacing, increased floatability, variable counterbore depths, and self-aligning capability are also available.
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