United Abrasives Straight Cartridge Roll | 38128 | 1" Diameter | 120 Grit | Sold by Box of 100

For refining machining marks and smoothing recessed metal surfaces after initial material removal, the United Abrasives 38128 Straight Cartridge Roll provides fine abrasive action across a relatively broad cylindrical working surface. Featuring a 1" diameter, 1-1/2" length, and 120-grit premium aluminum oxide abrasive, this cartridge roll is suited to light deburring, surface blending, and detailed finishing where a smoother sanding pattern is preferred over aggressive stock removal. Its straight configuration allows abrasive contact along internal channels, fillets, recesses, side walls, and the bottoms of dead-end holes. Compared with the 60- and 80-grit alternatives, the finer 120-grit grain helps reduce scratches left by earlier sanding operations. United Abrasives identifies ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel as suitable workpiece materials.

The United Abrasives 38128 incorporates a multi-layer, self-dressing construction, meaning fresh cutting abrasive becomes exposed as successive layers wear away, helping maintain effective sanding action during use. Its 1/4" arbor opening accommodates a correspondingly sized cartridge roll mandrel for mounting on a compatible rotary tool. With a maximum operating speed of 18,000 RPM, the roll must be matched to equipment that does not exceed its rated operating speed. The 1" diameter offers broader abrasive contact than smaller cartridge rolls when workpiece clearance permits, while the 1-1/2" length supports finishing along elongated internal surfaces. Supplied in a box of 100, the 38128 supports repeated surface refinement in machining facilities, metal fabrication shops, toolrooms, and industrial maintenance departments.

Type: Straight Cartridge Roll | Part Number: 38128 | Abrasive Material: Premium Aluminum Oxide | Diameter: 1" | Length: 1-1/2" | Arbor: 1/4" | Grit: 120 | Max RPM: 18,000 | Mandrel Part Number: 95102 | Quantity: 100 per Box | Material Application: Ferrous Metals, Non-Ferrous Metals, Stainless Steel, High-Tensile Steel

Features:

• Premium aluminum oxide grain supports fine sanding, light deburring, and surface blending on ferrous and non-ferrous metal components.
• 120-grit abrasive helps refine machining marks and reduce sanding scratches remaining after coarser abrasive operations.
• 1" diameter provides a broader abrasive contact area for accessible internal grooves, cavities, and recessed metal surfaces.
• 1-1/2" straight cylindrical profile allows sanding along side walls, fillets, elongated channels, and the bottoms of dead-end holes.
• Multi-layer, self-dressing construction exposes fresh cutting abrasive as successive layers wear away, helping maintain effective abrasive action.
• 18,000 RPM maximum operating speed provides a defined limit for matching the cartridge roll with an appropriately rated rotary tool and mandrel.
• Quick removal and installation simplify abrasive changes during multi-stage metal finishing work.
• Supplied in boxes of 100 to support recurring precision sanding requirements and planned abrasive replenishment.

Applications:

• Precision machining and CNC finishing - Refining minor tool marks and smoothing wider internal grooves after initial deburring.
• Tool and die workshops - Finishing accessible tooling cavities, recessed contours, and internal fillets where controlled abrasive contact is important.
• Stainless steel fabrication - Performing fine sanding and localized blending on stainless steel and high-tensile steel components.
• Metal component manufacturing - Reducing scratches left by intermediate abrasives and preparing recessed surfaces for additional finishing steps.
• Industrial maintenance and repair - Smoothing localized imperfections on machinery components, metal fittings, and recessed repair areas.

FAQs:

• Q: What is the difference between United Abrasives 38128 and 38127 Straight Cartridge Rolls?
  A: Both models have a 1" diameter, 1-1/2" length, 1/4" arbor opening, and 18,000 RPM maximum operating speed. The 38128 uses finer 120-grit abrasive for surface refinement, while the 38127 uses 80-grit abrasive for intermediate sanding and greater material removal.
• Q: Is the 38128 suitable for removing heavy burrs?
  A: The 120-grit abrasive is more appropriate for light burr removal, scratch refinement, and finishing than aggressive stock removal. For heavier burrs or prominent machining marks, begin with a coarser cartridge roll before progressing to the 38128.
• Q: Can this cartridge roll be used on stainless steel?
  A: Yes. United Abrasives lists stainless steel and high-tensile steel among the suitable materials. Use a cartridge roll dedicated to stainless steel when preventing contamination from abrasives previously used on carbon steel is important.
• Q: Which mandrel is listed for United Abrasives part number 38128?
  A: The United Abrasives 2025-2026 catalog listing identifies mandrel part number 95102. The cartridge roll has a 1/4" arbor opening. Confirm the mandrel's mounting engagement, shank compatibility, and speed rating before use.
• Q: Can I use the 38128 with a 25,000 RPM die grinder?
  A: No. Its maximum operating speed is 18,000 RPM, so a tool rated for 25,000 RPM exceeds the abrasive's limit. Select a rotary tool whose maximum speed does not exceed the cartridge roll's rating.
• Q: How many cartridge rolls are supplied in a box?
  A: United Abrasives part number 38128 is listed in a box quantity of 100. The available product data does not establish whether a mandrel is included, so verify package contents separately.

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For help choosing the correct United Abrasives Straight Cartridge Rolls for your application, please call (800) 608-5210 or email info@intlairtool.com