McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Size
    Industrial Info Snippet
    Helical Insert Type
    Thread Type
    Threaded Insert Type
    Installed Length
    Attribute Image
    Color
    DFARS Specialty Metals
    End Type
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    For Material Thickness
    Hole Diameter
    Internal Locking Type
    Passivation
    Profile
    Threaded Insert Securing Type
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Certification
    Drill Bit Size
    Attribute Image
    For Tap Type
    Military Specification
    Sold As
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Comments
    E-mail address (if you would like a response)
    4 Products
    About Threaded Inserts
    industrial info icon

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

    Screw-Locking Helical Threaded Inserts

    Image of Product. Pronged. Bottom orientation. Threaded Inserts. Screw-Locking Helical Threaded Inserts, Pronged.

    Pronged

    The irregularly shaped threads tightly grip screws to prevent them from loosening or backing out under vibration. Use these inserts to create or repair threads in pumps and other machinery that shakes and rattles. Also known as Heli-Coil inserts.
    Installation requires a drill bit, a helical insert tap, and an installation tool.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Inserts
    Through-Hole
    Taps
    Closed-End
    Hole Taps
    Installation
    Tools
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    Each
    Each
    Pronged
     
    18-8 Stainless Steel
    1"-8
    1"1 1/32"
    1.031"NASM21209, MS21209C1610190296A1660000091709A115000000091709A491000000090261A175000000
     
    back to top