MTHLD™ Mass Timber Heavy Lifting Device
Product Details
The MTHLD Mass Timber Heavy Lifting Device provides high capacity and versatility for erecting large panels and beams. The device installs with Strong Drive® SDCF Timber-CF structural screws in a variety of patterns that the designer has determined are sufficient to provide the right capacity for the lift.
Key Features
- Weld‑on ring with 180° swivel
- Six‑screw hole pattern in plate allows for symmetric 2‑, 4‑ and 6‑screw options
- Tested for applications on floor/roof panels, wall panels, beams and columns
- OSHA Section 1926.753(e)(2) compliant
Material
- Steel
Finish
- Simpson Strong-Tie orange powder coat
Installation
- See Lifting Device Design Guide (TEB‑C‑LIFTING) for warnings, installation instructions and information on rigging design considerations, loads, capacities and maintenance of the MTHLD.
- Do not use the MTHLD until you have read all warnings, disclaimers, instructions and information in TEB‑C‑LIFTING and T‑MT‑MTHLDUSE.
- A qualified design professional must specify screw model, quantity and pattern (screw model options include Strong‑Drive SDCF Timber‑CF: SDCF27400, SDCF27614, SDCF27778). Screws may be installed with either drill motors or impact driver tools in accordance with L‑F‑MTINSTALL.
Related Literature
Product Information Table
| Model No. | Description | Packaging Qty. |
|---|---|---|
| MTHLD6 | Mass Timber Heavy Lifting Device | 1 |
Load Tables
Allowable Loads — CLT Panel Face-Grain Attachment
| Model No. | Minimum Panel Thickness (in.) | Screws | Allowable Load, F2 (lb.) | ||
|---|---|---|---|---|---|
| Type | Quantity | θ = 90° | θ = 60° | ||
| MTHLD6 | 3 1/2 | 0.390" x 4" SDCF | (4) | 2,175 | 1,645 |
| (6) | 3,225 | 2,750 | |||
| 5 5/8 | 0.390" x 6 1/4" SDCF | (4) | 4,020 | 3,330 | |
| (6) | 6,035 | 5,635 | |||
- Allowable loads are valid for screws installed at 90° into the face-grain of the CLT panel.
- See Additional Notes below.
Allowable Loads — Glulam Beam Face-Grain Attachment
| Model No. | Minimum Beam Width (in.) | Screws | Allowable Load, F2 (lb.) | ||
|---|---|---|---|---|---|
| Type | Quantity | θ = 90° | θ = 60° | ||
| MTHLD6 | 5 7/8 | 0.390" x 6 1/4" SDCF | (4) | 4,245 | 3,385 |
| (6) | 6,370 | 5,080 | |||
- Allowable loads are valid for screws installed at 90° into the face-grain of the glulam beam.
- See Additional Notes below.
Allowable Loads — CLT Wall Panel Tilt-Up w/ Edge Attachment
| Model No. | Wall Panel CLT Layup | Screws | Allowable Load, F2 (lb.) | Allowable Load, F4 (lb.) | |||
|---|---|---|---|---|---|---|---|
| Type | Quantity | θ = 90° | θ = 60° | θ = 90° | θ = 60° | ||
| MTHLD6 | 3-ply (4" min.) | 0.390" x 6 1/4" SDCF | (2) | 1,700 | 1,380 | 785 | 825 |
| 5-ply (6 7/8" min.) | (4) | 3,690 | 2,990 | 1,445 | 1,760 | ||
| 7-ply (9 5/8" min.) | 0.390" x 7 7/8" SDCF | (6) | 4,980 | 4,035 | 2,035 | 2,755 | |
- Allowable loads are valid for screws installed at 90° into the edge of the CLT panel.
- See Additional Notes below.
Allowable Loads — Glulam Column Tilt-Up w/ End-Grain Attachment
| Model No. | Minimum Column Width (in.) | Screws | Allowable Load, F2 (lb.) | Allowable Load, F4 (lb.) | |
|---|---|---|---|---|---|
| Type | Quantity | θ = 90° | |||
| MTHLD6 | 6 3/4 | 0.390" x 7 7/8" SDCF | (4) | 2,815 | 1,245 |
| (6) | 4,225 | 1,870 | |||
- Allowable loads are valid for screws installed at 90° into the end-grain of the glulam column.
- See Additional Notes below.
Additional Notes:
- Allowable loads have a factor of safety of 5 and meet the requirements of OSHA safety standards for hoisting and rigging section 1926.753(e)(2).
- Screws are only permitted to be used for a single lift and shall not be used for structural applications thereafter.
- Allowable loads apply to wood with a specific gravity of 0.42 or greater.
- For conditions where the moisture content of the wood is greater than 19%, adjust load values by the factor, CM = 0.70.
- Allowable loads act in the direction of the sling angle (θ), i.e., the angle between the horizontal plane (wood surface) and the sling leg.
Additional calculation is required to determine the allowable weight of the element to be lifted (See TEB-C-LIFTING). - Tabulated values are not valid if θ < 60°. Linear interpolation is allowed for 60° < θ < 90° when allowable loads for both angles are shown in the tables.
- A qualified professional must specify the appropriate screw model and quantity from the load tables. Screws shall be installed according to the pattern associated with the specified quantity.
0.390" x 4" SDCF = Model SDCF27400;
0.390" x 6-1/4" SDCF = Model SDCF27614;
0.390" x 7-7/8" SDCF = Model SDCF27778. - All rigging components and spreader bars that are used in conjuction with the MTHLD shall be of sufficient strength and stiffness to carry the required load.
- For additional information, see Lifting Device Design Guide (TEB-C-LIFTING).
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
