Simpson Strong-Tie offers a DIY workbench hardware kit that is based off of their RTC24 3-way right angle steel brackets. Although a Strong-Tie workbench requires more effort to build than a 2×4 Basics workbench, there are two main advantages – greater load capacity and the ability to customize the height of the workbench.
The Simpson Strong-Tie hardware kit (KWB1) comes with 8 steel brackets, 200 Strong Drive self-drilling screws, and plans to get you started. Construction is as simple as with the 2×4 Basics brackets – cut your 2x4s, work surface and shelving down to size, and then screw everything together.
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One of our workbenches is constructed using these RTC24 brackets, although we purchased the brackets and #8×1.25″ self-drilling screws separately. Overall the workbench has stood up very well to abuse, and is topped with a 1-1/4″-thick IKEA countertop.
Here’s a PDF from Simpson Strong-Tie that shows a few of the example setups you can build using the RTC24 brackets included in this kit. Note that some of the examples are built using multiple kits.