Mechanical Anchors

Undercut Anchor

Undercut Anchor
  • Undercut Anchor
  • Undercut Anchor
  • Undercut Anchor

    • Mechanical Anchors

    Undercut Anchor

    The undercut anchor is engineered for secure post-installed fixation in concrete, using a mechanical interlock mechanism that eliminates the need for secondary hole expansion. Available in a wide range of diameters and materials, it is suitable for demanding structural applications requiring high tensile and shear performance.

    Available Sizes & Materials

    • Nominal diameters: M10/16, M12/18, M12/22, M16/22, M16/28, M20/28, M20/35, M24/38, M27/40, M30/44
    • Material options:
      Carbon steel (Grades 4.6–4.8)
      Alloy steel (Grades 5.8–12.9)
      Stainless steel (A2-50, A4-70, A4-80, etc.)
      TA2 titanium alloy
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    Technical Data

    Pre-Set Undercut Anchor (Stainless Steel)

    Material class Effective embedment depth (mm) Tension load (kN) (nominal/design) Shear load (kN) (nominal/design)
    Cracked concrete Non-cracked concrete Cracked concrete Non-cracked concrete
    304 70 7.7/6.4 7.7/6.4 3.8/3.2 3.8/3.2
    90 7.7/6.4 7.7/6.4 3.8/3.2 3.8/3.2
    316 70 16.5/13.7 16.5/13.7 8.2/6.9 8.2/6.9
    90 16.5/13.7 16.5/13.7 8.2/6.9 8.2/6.9
    304 70 12.2*/ 10.2 12.2*/ 10.2 6.1/51 61/5.1
    100 12.2/10.2 12.2/10.2 61/51 61/5.1
    316 70 20.5/11.4 26.1*/ 21.8 131/10.9 131/10.9
    100 261/21.8 261/21.8 131/10.9 131/10.9
    304 70 17.7/14.8 17.7/14.8 8.9/7.4 8.9/7.4
    80 17.7*/ 14.8 17.7*/ 14.8 8.9/7.4 8.9/7.4
    100 17.7*/ 14.8 17.7*/ 14.8 8.9/7.4 8.9/7.4
    120 17.7*/ 14.8 17.7*/ 14.8 8.9/7.4 8.9/7.4
    316 70 20.5/11.4 28.7/15.9 19.0/15.8 19.0/15.8
    80 25.0/13.9 351/19.5 19.0/15.8 19.0/15.8
    100 35.0/19.5 37.9*/ 31.6 19.0/15.8 19.0/15.8
    120 37.9*/ 31.6 37.9*/ 31.6 19.0/15.8 19.0/15.8
    304 100 33.0/27.5 33.0/27.5 16.5/13.7 16.5/13.7
    130 33.0*/ 27.5 33.0*/ 27.5 16.5/13.7 16.5/13.7
    165 33.0*/ 27.5 33.0*/ 27.5 16.5/13.7 16.5/13.7
    316 100 35.0/19.4 49.0/27.2 35.3/29.4 35.3/29.4
    130 51.9/28.8 70.7*/ 58.9 35.3/29.4 35.3/29.4
    165 70.7*/ 58.9 70.7*/ 58.9 35.3/29.4 35.3/29.4
    304 170 50.5*/ 42.9 50.5*/ 42.9 25.7/21.4 25.7/21.4
    210 50.5*/ 42.9 50.5*/ 42.9 25.7/21.4 25.7/21.4
    316 170 776/43.1 108.6/60.3 55.1/45.9 55.1/45.9
    210 106.5/59.2 110.3*/ 90.9 55.1/45.9 55.1/45.9
    304 210 74.0*/ 61.7 74.0*/ 61.7 37.0/30.8 37.0/30.8
    316 210 106.5/59.2 1491/82.8 79.3/661 79.3/661
    304 250 96.4*/ 80.3 96.4*/ 80.3 48.2/40.2 48.2/40.2
    316 250 138.3/76.8 193.7/107.6 103.3/86.1 103.3/861

    Through-Set Undercut Anchor (Stainless Steel)

    Anchor rod size Material class Effective embedment depth (mm) Tension load (kN) (nominal/design) Shear load (kN) (nominal/design)
    Cracked concrete Non-cracked concrete Cracked concrete Non-cracked concrete
    M8 304 70 7.7/6.4 7.7/6.4 14.7/12.3 14.7/12.3
    90 7.7/6.4 7.7/6.4 14.7/12.3 14.7/12.3
    316 70 16.5/13.7 16.5/13.7 31.6/26.3 31.6/26.3
    90 16.5/13.7 16.5/13.7 31.6/26.3 31.6/26.3
    M10 304 70 12.2*/ 10.2 12.2*/ 10.2 19.0/15.8 19.0/15.8
    100 12.2/10.2 12.2/10.2 16.7/13.9 16.7/13.9
    316 70 20.5/11.4 26.1*/ 21.8 40.7/33.9 40.7/33.9
    100 261/21.8 261/21.8 35.8/29.8 35.8/29.8
    M12 304 70 17.7/14.8 17.7/14.8 23.7/19.7 23.7/19.7
    80 17.7*/ 14.8 17.7*/ 14.8 23.7/19.8 23.7/19.8
    100 17.7*/ 14.8 17.7*/ 14.8 23.7/19.8 23.7/19.8
    120 17.7*/ 14.8 17.7*/ 14.8 23.7/19.8 23.7/19.8
    316 70 20.5/11.4 28.7/15.9 50.8/42.3 50.8/42.3
    80 25.0/13.9 351/19.5 50.8/42.3 50.8/42.3
    100 35.0/19.5 37.9*/ 31.6 50.8/42.3 50.8/42.3
    120 37.9*/ 31.6 37.9*/ 31.6 50.8/42.3 50.8/42.3
    M16 304 100 33.0/27.5 33.0/27.5 35.3/29.4 35.3/29.4
    130 33.0*/ 27.5 33.0*/ 27.5 35.3/29.4 35.3/29.4
    165 33.0*/ 27.5 33.0*/ 27.5 35.3/29.4 35.3/29.4
    316 100 35.0/19.4 49.0/27.2 75.6/63.0 75.6/63.0
    130 51.9/28.8 70.7*/ 58.9 75.6/63.0 75.6/63.0
    165 70.7*/ 58.9 70.7*/ 58.9 75.6/63.0 75.6/63.0
    M20 304 170 50.5*/ 42.9 50.5*/ 42.9 93.7/78.1 93.7/78.1
    210 50.5*/ 42.9 50.5*/ 42.9 93.7/78.1 93.7/781
    316 170 77.6/43.1 108.6/60.3 200.8/167.3 200.8/167.3
    210 106.5/59.2 110.3*/ 90.9 200.8/167.3 200.8/167.3
    M24


    M27    		 304 210 74.0*/ 61.7 74.0*/ 61.7 108.5/90.4 108.5/90.4
    316 210 106.5/59.2 149.1/82.8 232.6/193.9 232.6/193.9
    304 250 96.4*/ 80.3 96.4*/ 80.3 120.1/100.0 120.1/100.0
    316 250 138.3/76.8 193.7/107.6 257.2/214.3 257.2/214.3
    Applications
    • Fixing curtain wall brackets and subframes
      Fixing curtain wall brackets and subframes
    • Load anchoring for steel structures
      Load anchoring for steel structures
    • Anchoring of stair tread plates and joint covers
      Anchoring of stair tread plates and joint covers
    • Installation of crash barriers and noise insulation walls
      Installation of crash barriers and noise insulation walls
    • Fixation of steel plates for bonded steel reinforcement
      Fixation of steel plates for bonded steel reinforcement
    • Anchoring for concrete overlay and structural connection points
      Anchoring for concrete overlay and structural connection points
    • Rail transit anchoring system
      Rail transit anchoring system
    • Bridge and roadway anchoring systems
      Bridge and roadway anchoring systems
    Features
    • No need for secondary hole reaming, fast and efficient installation
    • Excellent durability and weldability, suitable for high-temperature environments
    • Low expansion stress, compatible with various concrete substrates
    • Available in multiple materials and corrosion protection finishes to suit different site conditions
    • Engineered locking mechanism ensures reliable tensile and shear performance
    • Simple structure with strong seismic resistance, abrasion resistance, and high thermal stability
    Test Reports

    Our undercut anchors are tested to verify their mechanical reliability and long-term durability in demanding structural environments. The following reports confirm their compliance with recognized standards:

    • Seismic Resistance Report
    • Fire Resistance Report (120 minutes)
    • Tensile and Shear Strength Test Report
    • Hot-Dip Galvanizing Report
    • Fatigue Resistance Report (2 million cycles)
    • Zinc Coating Thickness Report
    Talk to an Expert

    Have a question or need a custom quote? Fill out the form and our engineering team will get back to you soon.

    Email: mkt_uk01@163.com
    Structural Strengthening Products