Ever fumbled with setups that throw off your entire project by a hair's breadth? These matched pair 1-2-3 blocks eliminate that frustration, delivering the ultra-precise foundation every machinist craves.
Made from premium tool steel, heat-treated and case-hardened to HRC 57-62, these blocks are ground flat and square on all six sides. Squareness tolerance sits at an impressive 0.0002 inches per inch—tight enough for the most demanding milling or grinding tasks. At 1" x 2" x 3" each, they slot perfectly into your workflow without dominating your vise.
Twenty-three precision-drilled holes give you endless clamping options: five 3/8-16 threaded holes for bolts and clamps, plus 18 untapped ones for pins or stops. The smart cross-drilling design shaves weight down to 2.1 lbs total while maintaining rock-solid strength. No more bulky blocks that strain your setup— these stay put under heavy cuts.
Picture truing up a cylinder head on the mill: drop these blocks in the vise, clamp your part, and you're square in seconds. Or use them stacked for height in layout work on the surface plate. They've handled everything from prototype runs to production fixturing in my shop, saving hours on alignments. The hardened finish resists dings and wear, so they look and perform like new job after job.
Whether you're a hobbyist dialing in your first Bridgeport or a pro chasing tolerances in aerospace parts, these 1-2-3 blocks become your go-to. Pair them with parallels or sine plates for setups that wow. Invest in tools that work as hard as you do—no shortcuts, just results.
