McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Size
    Industrial Info Snippet
    Nut Type
    Industrial Info Compare
    Locking Type
    Thread Type
    Military Specification
    Certification
    Thread Direction
    Material
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Sold As
    Height
    Attribute Image
    Thread Spacing
    Industrial Info Snippet
    Hex Nut Profile
    Width
    Attribute Image
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    1 Product

    Mil. Spec. Flex-Top Locknuts for Heavy Vibration

    Image of Product. Front orientation. Locknuts. Mil. Spec. Flex-Top Locknuts for Heavy Vibration.
    These locknuts are manufactured and tested to strict U.S. military standards for material and construction. The top section expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. As a result, they're suitable for use in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.
    Steel
    These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.
    Cadmium-Plated Steel—These locknuts have good lubricity to thread on smoothly and ease installation. The plating also creates a barrier against rust that's comparable to zinc-yellow-chromate plating.
    Thread
    Size
    Wd.
    Ht.
    Mil.
    Spec.
    Pkg.
    Qty.
    Pkg.
    Cadmium-Plated Steel
    5/8"-18
    		15/16"49/64"MS21045-10199638A800000000
    Mil. Spec. Flex-Top Locknut for Heavy Vibration, Cadmium Plated Steel, 5/8"-18 Thread, MS21045-10
    Pack of 1In stock
    Compatible Products for This Locknut
     
    back to top