Spi 630-4000 Setup Block Steel Matched Pair

Product Description

The SPI 630-4000 is a hardened steel setup block used to establish precise reference surfaces and square alignments in machine shop and toolroom applications. Sold as a matched pair, each block is ground to a squareness tolerance of 0.0001 inches and an overall tolerance of 0.0001 inches, making it suitable for high-accuracy workholding, inspection, and fixture setup. The block measures 1 inch wide, 2 inches long, and 3 inches tall, and carries a hardness rating of 50 HRC for long service life under repeated use. A hex key and socket head cap screw are included.

These blocks are used in machine shops, toolrooms, and precision manufacturing environments wherever a reliable, square reference is needed. Typical applications include setting up milling fixtures, aligning workpieces on surface plates, and supporting inspection setups. The combination of tapped and untapped holes allows flexible clamping and mounting configurations. Machinists, tool and die makers, and metrology technicians are the primary users of this product.

Key Features

• Squareness of 0.0001 inches for high-accuracy reference setups
• Overall tolerance of 0.0001 inches across all ground surfaces
• Hardened steel construction at 50 HRC for durability and wear resistance
• 5 tapped holes (3/8-16) and 18 untapped holes (0.3500 inch diameter) for versatile mounting
• Sold as a matched pair for consistent, repeatable setups
• Includes hex key and socket head cap screw

Compatibility

Designed as a precision reference tool for use on standard surface plates and in general-purpose machining and inspection fixtures where a 1 inch by 2 inch by 3 inch block format is required.

Installation Notes

Setup blocks are typically placed and secured by machinists or metrology technicians without requiring power tools or specialized trade licensing. Ensure the mounting surface and block contact faces are clean and free of burrs or debris before placing the block, as surface contamination will directly affect squareness accuracy. Use the included socket head cap screw and hex key for securing the block where the tapped holes are engaged. Handle with care to avoid dropping, which can chip ground surfaces and compromise tolerance.