Mungo MHDA Hollow Ceiling Anchor for Hollow Core Slabs: Technical Data Sheet

Key things to remember

The essentials from this document in plain words. Check the full document before you rely on a figure.

• ✓For prestressed hollow core concrete slabs of strength class C30/37 to C50/60, with a slab flange at least 30mm thick. Steel expansion body and cone, zinc plated over 5 microns.
• ✓Sizes M6, M8, M10 and M12 take a metric screw or threaded rod. Drill holes are 10, 12, 16 and 18mm, 50 to 65mm deep, and the installation torque is 10Nm for M6 and M8, 20Nm for M10 and M12.
• ✓Install: hammer drill, insert the anchor (no hole cleaning needed), position the fixture, fix it with a screw or threaded rod and nut, then tighten with a torque spanner. The anchor may only be set once.
• ✓Keep the anchor at least 200mm from an edge, 400mm apart parallel to the prestressed reinforcement and 200mm apart across it, and more than 50mm from the prestressed reinforcement.
• ✓Recommended tension load for every size, with a grade 8.8 or better screw or rod, C30/37 to C50/60, no edge or spacing influence: 1.86kN in non-cracked and 1.29kN in cracked slabs. Partial safety factors of 1.5 (material) and 1.4 (load) are included.
• ✓Fire resistance is tabled for 30 to 120 minutes of fire from one side; the recommended load under fire is far lower, for example 0.01kN to 0.02kN for M6 and 0.26kN to 0.33kN for M12.
• ✓Combined loads, closer edges or spacing, and anchor groups need lower values, and the data must be checked by an engineer experienced in anchorage and concrete work.

Who it helps: Electricians, plumbers and services installers hanging pipes, cable trays and ducts from hollow core concrete ceilings, and the engineers checking them.