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  • 4-40 x 2D UNC, LOCKING, Tanged, Wire Thread Repair Insert, 304/A2 Stainless (Pack 50)

    £23.01
    (Exc. 20% VAT)
    In stock, immediate despatch
    +
    Part Number
    WTLUNC4x2D-A
    Thread Form
    UNC (Unified National Coarse)
    Diameter
    No.4
    Length
    2 x Dia (2D)
    Material
    304/A2 Stainless
    Type
    Thread LOCKING Inserts
    Thread Pitch
    40 TPI
    Tang
    Tanged
    Pack Quantity
    Pack of 50
    Information
    Diameter Pitch
    (mm)
    Thread Form Length Style Material
    4 40 UNC (Unified National Coarse) 2.0D Thread Locking - Tanged Stainless Steel


    Length explained 
    The length of a wire thread insert is calculated as a multiple of the diameter:
    e.g. M8 x 1.5D the insert length = 12mm;
    e.g. M8 x 2D the insert length = 16mm 

    About our LOCKING Thread Repair Inserts
    Sometimes referred to by the brand names of Helicoilï¾® or Recoilï¾®, helically-coiled wire thread inserts are a thread strengthening fastening device used to create high strength threads in softer core materials. The high performance internal thread provided by our wire inserts is far stronger than most parent materials, and is also heat, corrosion, and wear resistant too.
    Our screw locking inserts have all of the advantages of a free running type plus the additional benefit of prevailing locking torque, which makes them a valuable and reliable choice for use in applications subject to cyclic vibration or impact.
    The locking torque is achieved by the action of a polygonal grip coil in the insert that exerts radial pressure on the male thread, with each grip coil consisting of a number of tangential locking chords that protrude inside the minor diameter of the normal free running coils. As the male thread passes through these grip coils, the locking flats are displaced, thereby exerting radial pressure and prevailing locking torque on the male thread.
    On removal of the male thread, the locking coil relaxes to its original form, allowing for repeated assembly whilst retaining a measurable level of prevailing torque.
    Note: It is recommended that only close fit plated or lubricated bolts and screws are used with screw locking inserts. Pre-wind tools must be used to install locking inserts.


     

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