3M 38929451 373L 30 Mic A/O 1-31/64in x 450ft Microfinishing Film Roll
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This new 3M 373L Microfinishing Film is a precision abrasive roll featuring aluminum oxide (A/O) mineral on a 6-mil polyester film backing, graded at 30 micron (approximately 400 grit equivalent) for fine surface finishing and superfinishing applications. The roll measures 37.5 mm (1-31/64 in) wide by 137 m (450 ft) long and 16 mm (0.625 in / 5/8 in) core, with the abrasive side wound out for direct use on tape lapping, superfinishing, and precision cylindrical finishing equipment. The 373L designation indicates a pressure-sensitive adhesive-free film construction oriented abrasive-side-out, delivering consistent, uniform scratch patterns suited to achieving tight surface finish tolerances on ferrous and non-ferrous metals, as well as ceramics and composites. This jumbo roll (Run TR3) is manufactured in the USA with globally sourced materials and carries 3M internal ID 60-0003-0091-6 and C-PN 38929451, intended for industrial superfinishing machines, bore finishing tools, and tape lapping systems where repeatable sub-micron finishes are required.
Product Specifications
| Brand | 3M |
| Product Line | 373L Microfinishing Film |
| 3M Part Number (C-PN) | 38929451 |
| 3M Internal ID | 60-0003-0091-6 |
| Abrasive Mineral | Aluminum Oxide (A/O) |
| Grade | 30 Micron (30 MIC) |
| Backing Material | Polyester Film |
| Backing Thickness | 6 mil |
| Width | 37.5 mm (1-31/64 in) |
| Length | 137 m (450 ft) |
| Core Diameter | 16 mm (0.625 in / 5/8 in) |
| Wind Direction | Abrasive Side Out |
| Roll Quantity | 1 Roll |
| Run | TR3 |
| Condition | New |
| Country of Manufacture | USA (with globally sourced materials) |