McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Size
    Industrial Info Compare
    Threaded Insert Type
    For Tap Thread Size
    Industrial Info Snippet
    Attribute Image
    Material
    Tensile Strength
    Industrial Info Snippet
    Performance
    Key-Locking Insert Wall Type
    Thread Type
    End Type
    Military Specification
    Profile
    Sold As
    Threaded Insert Securing Type
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Snippet
    Drill Bit Size
    Attribute Image
    Certification
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    External Locking Type
    Hole Diameter
    Thread Direction
    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)
    Help me decide (beta)
    1 Product
    About Threaded Inserts
    industrial info icon

    Choose the right threaded insert for your application and learn how to install it securely.

    Mil.-Spec. Key-Locking Threaded Inserts For Soft Metal

    Image of Product. Bottom orientation. Threaded Inserts. Mil.-Spec. Key-Locking Threaded Inserts For Soft Metal.
    These inserts are manufactured and tested to meet or compare to strict standards adopted by the U.S. military. The keys drive into aluminum and other soft metal for a secure hold that won't slip or rotate, even in vibrating vehicle or aerospace parts. These inserts are comparable to Keensert inserts.
    To install, drill and tap a hole in your material. Then, thread the insert onto the installation tool and screw it into the hole. Place the tool over the keys and hit it with a hammer to drive them in.
    Standard Wall—Stronger than thin-wall inserts, these are your go-to choice for threading most holes.
    High-Strength Cadmium-Plated Alloy Steel—These inserts have the strength to stand up to high-pressure applications and a plating that helps screws thread in smoothly.
    Thread
    Size
    For Tap Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Locking
    Keys
    Specs. Met
    Each
    Standard Wall
     
    High-Strength Cadmium-Plated Alloy Steel
    3/4"-16
    		1 1/8"-12
    		1.125"1 1/16"
    		1.062"4MS51831A20995101A137000000
    Mil. Spec. Alloy Steel Key-Locking Insert for Soft Metal, Standard Wall, 3/4"-16 Thread Size
    EachIn stock
    Compatible Products for This Threaded Insert
     
    back to top