Tesa Brown Sharpe 745-255 Magnetic Block Chuck

Product Description

The TESA BROWN SHARPE 745-255 is a fine pole rectangular permanent magnetic block chuck designed for precision surface grinding applications. It holds ferrous workpieces securely using permanent magnetic force, eliminating the need for clamps or fixtures that could obstruct wheel access or distort thin parts. The chuck measures 5.25 inches long by 2.4375 inches wide by 2.875 inches high and delivers parallelism and squareness tolerances of 0.001 inch, making it well-suited for high-accuracy grinding work. Machinists and tool room technicians install this type of chuck on surface grinders where repeatable, flat, and square workholding is required.

This chuck is intended for surface grinder tables in tool rooms, job shops, and production grinding cells. The fine pole configuration increases holding force on smaller workpieces and thin stock compared to coarse pole designs, making it effective for precision die work, gauge block lapping setups, and general flat grinding tasks. The rectangular block form factor fits standard surface grinder T-slot tables. The unit ships in a wooden case, which provides storage and protection between uses.

Key Features

• Fine pole magnet configuration for increased holding force on small and thin ferrous workpieces
• Parallelism tolerance of 0.001 inch for accurate, repeatable surface grinding
• Squareness tolerance of 0.001 inch ensures square reference surfaces
• Permanent magnetic design requires no electrical power to maintain holding force
• Rectangular block chuck form fits standard surface grinder tables
• Includes wooden case for protection and storage

Compatibility

Designed as an OEM-style permanent magnetic block chuck for use on surface grinders that accept rectangular chuck mounting in the 5.25 inch by 2.4375 inch footprint.

Installation Notes

Installation and setup should be performed by a qualified machinist or tool room technician familiar with surface grinding equipment. De-energize and lock out the surface grinder before mounting or removing the chuck. Mount the chuck securely to the grinder table using the appropriate T-bolts and fasteners per the machine manufacturer's specifications. Verify parallelism and squareness of the chuck surface to the grinding wheel travel before putting the chuck into service.