Fowler 52-439-246-0 2-4-6 Setup Block Matched Pair

Product Description

The FOWLER 52-439-246-0 is a matched pair of hardened steel 2-4-6 blocks designed for precision workholding and setup applications on milling machines, surface plates, and magnetic chucks. Each block measures 2 inches wide by 4 inches tall by 6 inches long and is ground to an overall tolerance of 0.0010 inches, with parallelism held to 0.0001 inches and squareness to 0.0003 inches. The steel is hardened to 56-60 RC, resisting wear and deformation under repeated clamping loads. Machinists and tool-room technicians use these blocks to elevate and support workpieces, establish reference planes, and provide clamping surfaces during precision machining operations.

These 2-4-6 blocks are suited for use in tool rooms, job shops, and production environments where consistent, repeatable part positioning is required. The 31 tapped holes accept 5/8-11 threaded fasteners, allowing clamps, studs, and fixtures to be secured directly to the block face. Untapped through-holes measure 5/8 inches in diameter. Because the blocks are sold as a matched pair, they can be used in tandem on opposite sides of a workpiece for symmetrical support and parallel clamping setups.

Key Features

• Matched pair - both blocks ground to the same reference for consistent parallel setups
• Squareness of 0.0003 inches ensures accurate 90-degree reference surfaces
• Parallelism held to 0.0001 inches across all faces
• 56-60 RC hardness resists wear, nicking, and deformation over time
• 31 tapped holes (5/8-11) plus 5/8-inch untapped through-holes for flexible fixturing
• Overall tolerance of 0.0010 inches across all three dimensions

Compatibility

Designed for use as standard 2-4-6 precision setup blocks on milling machines, surface grinders, surface plates, and magnetic chucks wherever hardened steel workholding references are required.

Installation Notes

Setup blocks should be cleaned and inspected for burrs or nicks before each use to protect ground reference surfaces. When positioning on a magnetic chuck or surface plate, ensure the mating surface is free of chips and coolant residue. A licensed machinist or trained toolroom technician should verify block squareness periodically using a precision square or indicator. Avoid dropping or stacking blocks without protective material between them to prevent surface damage.