Undercut Anchor
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Mechanical Anchors
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
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 | |
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
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