1-2-3 blocks are precision-machined tools widely used in environments where accurate setups and measurements are crucial. The name “1-2-3 block” comes from the dimensions of these blocks, which are typically one inch thick, two inches wide, and three inches long. These blocks are usually made from hardened and ground steel, ensuring both durability and precision.
In use, 1-2-3 blocks serve multiple purposes, making them versatile tools in any setup. Their perfectly squared sides allow them to be used as reference standards for checking the squareness of other parts or for setting up machinery accurately. The precise dimensions make them ideal for use as spacers, parallels, or supports when setting up workpieces on milling machines, surface grinders, or inspection tables.
The blocks often feature a series of threaded and through holes, which add to their versatility. These holes allow the blocks to be bolted together or to other fixtures, providing flexibility in creating custom setups. The holes also enable the blocks to be used with clamps or bolts to hold workpieces securely during machining or inspection.
Due to their precise machining, 1-2-3 blocks are also used for measuring purposes, serving as a quick and reliable gauge to verify the dimensions or alignment of a workpiece. Their accuracy and reliability make them a staple in setups requiring precision.