McMaster-Carr logo
    Filter by
    System of Measurement
    Thread Size
    Industrial Info Snippet
    Helical Insert Type
    Threaded Insert Type
    For Material Thickness
    Installed Length
    Attribute Image
    Thread Type
    End Type
    Military Specification
    Thread Pitch
    Industrial Info Snippet
    Attribute Image
    Drill Bit Size
    Attribute Image
    For Tap Type
    Certification
    DFARS Specialty Metals
    Profile
    Sold As
    Threaded Insert Securing Type
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Tensile Strength
    Industrial Info Snippet
    Hole Diameter
    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)
    5 Products
    About Threaded Inserts
    industrial info icon

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

    Helical Threaded Inserts

    Image of Product. Prongless. Bottom orientation. Threaded Inserts. Helical Threaded Inserts, Prongless.

    Prongless

    Restore, reinforce, or create threads in metal. The tough coils on these inserts expand once installed to anchor in a tapped hole. Also known as Heli-Coil inserts, they're often used in engine heads and machinery housings where strong connections are critical. Unlike threadlocking inserts, you can remove and reuse them without them losing their strength.
    Installation requires a drill bit, a helical insert tap, and an installation tool.
    Prongless—Without a prong to break off and retrieve, these inserts save time and avoid leftover debris in holes.
    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., mm
    Drill Bit
    Size, mm
    For Max.
    Hole Dia., mm
    Specs. Met
    Pkg.
    Qty.
    Pkg.
    Each
    Each
    Each
    Prongless
     
    18-8 Stainless Steel
    M3 x 0.5 mm63.2
    		3.2NA0276M3-201091990A4120000091709A35500000091709A52400000091049A6220000000
     
    Extraction Tools
    Remove installed helical inserts.
    For Prongless Helical Inserts—Remove prongless inserts without damaging threads or the surface of your material. These tools also back out or adjust inserts that are installed too deep.
    For Thread
    Size
    Each
    For Prongless Helical Inserts
    M3
    		91049A3640000000
     
    back to top