Hobson performance data
XBolt Wall Frame Tie Down: Bottom Plate Uplift and Shear Capacities
Hobson's four-page product data sheet for using the mechanical galvanised XBolt screw anchor (MXHMSGM) to hold timber wall frame bottom plates down to a concrete slab. It gives the sizes, installation steps and washer sizes, and limit state design uplift and shear capacities in 20MPa and 32MPa concrete.
What this covers
- Sizes and part numbers
- Installation guide
- Washer sizes
- Uplift capacity, 20MPa concrete
- Uplift capacity, 32MPa concrete
- Shear strength
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- A hardened steel masonry screw anchor that the sheet says is suitable to restrain bottom plates in line with AS 1684, AS 1720 and NZS 3604. For internal and external wall frames.
- Five sizes: M10 x 100, 120 and 150 (15mm wrench), M12 x 100 and 150 (16mm wrench).
- Installation: drill 10mm or 12mm, 15mm deeper than the embedment you need; blow the hole clean 3 times or until the dust is gone; fit through the washer and bottom plate; drive with a ratchet or impact driver; check minimum embedment (M10 50mm, M12 55mm). Do the final turns by hand so the timber is not crushed.
- Minimum washer: 38 x 38 x 3.0mm for M10, 50 x 50 x 5.0mm for M12. Minimum fixture hole 13mm and 15mm.
- Uplift tables are limit state design loads (for engineers), set out by bottom plate height (35mm or 45mm), concrete strength (20MPa or 32MPa), edge distance (35mm or 45mm) and columns J2 to JD6. Example: M10 x 120 at 82mm embedment, 35mm plate, 20MPa, 45mm edge: 12.5kN under J2 to JD4, 12.0kN under JD5, 9.0kN under JD6.
- Example: M12 x 150 at 100mm embedment, 45mm plate, 32MPa, 45mm edge: 22.0kN under J2 to J4, 20.0kN under JD4, 16.0kN under JD5, 12.0kN under JD6.
- Shear strength tables (for engineers): in plane shear M10 12.4kN, M12 16.7kN at 35mm or 45mm edge distance. Out of plane shear is much lower: on the 20MPa page 2.2kN (M10, 35mm edge) to 4.5kN (M12, 45mm edge); on the 32MPa page 2.7kN to 5.7kN. Use at least 45mm edge distance to comply with NZS 3604.
Who it helps: Builders and engineers tying timber wall frame bottom plates to a concrete slab.
Share this document
Email it to yourself
Loading…
This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.