3M 7000044721 Microfinishing Film Roll 20 Micron

Product Description

The 3M 7000044721 Microfinishing Film Roll 372L is a precision abrasive roll designed for fine surface finishing on cylindrical components. It consists of aluminum oxide abrasive grains resin-bonded to a 5 mil polyester film backing, providing consistent cut and finish performance. The backing features a friction grip coating that reduces slippage during use. At 20 micron grade, this roll delivers a controlled, fine finish suitable for tight-tolerance applications. Machinists and finishing technicians use this product in production and repair environments where surface geometry must be maintained within strict parameters.

This microfinishing film roll is used in the precision finishing of cylindrical surfaces, including automotive camshafts and crankshafts. It is well-suited for lapping and microfinishing operations performed on cylindrical grinding machines and manual polishing fixtures. The 7-7/8 inch width, 165 foot length, and 3 inch core accommodate standard production roll finishing equipment. It is applicable in automotive component manufacturing, engine rebuilding shops, and precision machine shops where controlled surface finish is a process requirement.

Key Features

• Aluminum oxide abrasive resin-bonded to a 5 mil polyester film backing for consistent performance
• 20 micron grade for fine, controlled surface finishing
• Friction grip coating on backing reduces slippage during cylindrical finishing operations
• 7-7/8 inch width and 3 inch core size fit standard roll finishing equipment
• 165 foot roll length reduces changeover frequency in production environments

Compatibility

Designed for use in roll microfinishing and lapping operations on cylindrical surfaces such as automotive camshafts and crankshafts. Fits equipment accepting a 3 inch core with rolls up to 7-7/8 inches wide.

Installation Notes

This product is installed and operated by machinists or finishing technicians using cylindrical microfinishing or lapping equipment. Ensure the machine is powered down and all rotating components are fully stopped before loading or unloading the roll. Verify that the core size and roll width are compatible with the equipment before mounting. Follow the equipment manufacturer's guidelines for feed rate, contact pressure, and coolant use to maintain finish consistency and avoid film damage.