United Abrasives Tapered Cartridge Roll | 38308 | 3/8" Diameter | 120 Grit | Sold by Box of 100

For refining machining marks in narrow angled recesses, smoothing internal fillets, and finishing contoured metal surfaces, the United Abrasives 38308 Tapered Cartridge Roll provides fine abrasive action with an extended, pointed working profile. Featuring a 3/8" base diameter, 1-1/2" length, and 120-grit premium aluminum oxide abrasive, this roll is well suited to light deburring, scratch refinement, and blending surfaces after coarser sanding. Its full-taper shape gradually narrows toward the tip, providing focused contact in internal corners, angled channels, and recessed contours where a straight cartridge roll may be harder to position. The finer grit helps reduce visible sanding marks rather than aggressively remove stock.

The United Abrasives 38308 uses a multi-layer, self-dressing construction, meaning fresh cutting abrasive is exposed as successive layers wear away to help maintain effective sanding action. Its 1/8" arbor opening corresponds to the manufacturer-listed 95104 cartridge roll mandrel for appropriately matched mounting. The 26,000 RPM maximum operating speed establishes the abrasive's upper operating speed limit and must be considered when selecting a rotary tool and mandrel. Compared with the shorter 38302 model, its 1-1/2" abrasive length provides additional working contact along elongated angled features where sufficient clearance is available. Suitable workpiece materials include ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel. Part number 38308 is supplied in a box of 100 for recurring precision sanding and metal finishing operations.

Type: Tapered Cartridge Roll | Part Number: 38308 | Abrasive Material: Premium Aluminum Oxide | Base Diameter: 3/8" | Length: 1-1/2" | Arbor: 1/8" | Grit: 120 | Max RPM: 26,000 | Recommended Mandrel: 95104 | Quantity: 100 per Box | Material Application: Ferrous Metals, Non-Ferrous Metals, Stainless Steel, High-Tensile Steel

Features:

• Premium aluminum oxide abrasive 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 scratches left by earlier coarse or intermediate abrasive operations.
• Full-taper configuration provides a narrowing abrasive profile for accessing angled recesses, internal corners, and irregular metal contours.
• 3/8" base diameter keeps the working profile compact for localized finishing in relatively narrow openings.
• Extended 1-1/2" abrasive length offers additional contact along recessed fillets and elongated contours compared with shorter tapered rolls.
• Multi-layer, self-dressing construction exposes fresh cutting grain as successive abrasive layers wear away.
• 1/8" arbor opening corresponds to the manufacturer-listed 95104 cartridge roll mandrel for correctly matched mounting.
• Quick removal and installation simplify abrasive replacement, while the box quantity of 100 supports recurring metal finishing work.

Applications:

• Precision machining and CNC finishing - Refining residual tool marks around angled openings, narrow recessed contours, and internal fillets.
• Tool and die manufacturing - Smoothing accessible tooling cavities, tapered features, and elongated corners after initial deburring.
• Metal fabrication - Reducing sanding scratches and blending localized surface imperfections around irregularly shaped metal features.
• Stainless steel and alloy steel finishing - Performing fine abrasive sanding on recessed stainless steel and high-tensile steel components.
• Industrial equipment repair - Refining small contoured surfaces, accessible recessed fittings, and internal metal features during refurbishment.

FAQs:

• Q: How does United Abrasives 38308 differ from 38307?
  A: Both tapered cartridge rolls have a 3/8" base diameter, 1-1/2" length, 1/8" arbor opening, and 26,000 RPM maximum operating speed. The 38308 uses finer 120-grit abrasive for surface refinement, while the 38307 uses 80-grit abrasive for intermediate sanding and greater material removal.
• Q: What is the difference between the 38308 and shorter 38302?
  A: Both models feature a 3/8" base diameter and 120-grit abrasive. The 38308 is 1-1/2" long and lists mandrel 95104, while the 38302 is 1" long and lists mandrel 95105. The longer version provides additional abrasive contact along accessible recessed contours.
• Q: Is the United Abrasives 38308 intended for heavy burr removal?
  A: Its 120-grit abrasive is better suited to light deburring, fine sanding, and refining previously prepared surfaces. For prominent burrs, localized flash, or rough machining marks, the coarser 60-grit 38306 may be more effective during initial material removal.
• Q: What advantage does the tapered profile offer for metal finishing?
  A: The narrowing shape helps the abrasive reach angled corners, internal fillets, and contoured recesses. A straight cartridge roll maintains a uniform cylindrical profile and may be preferable when sanding parallel side walls or straight channels.
• Q: Can the United Abrasives 38308 be used on stainless steel?
  A: Yes. United Abrasives identifies stainless steel and high-tensile steel among the suitable materials, along with ferrous and non-ferrous metals. Use dedicated abrasives when preventing contamination from previous carbon steel work is important.
• Q: Which mandrel and speed rating apply to SKU 38308?
  A: The United Abrasives 2025-2026 catalog identifies mandrel part number 95104 for the 1/8" arbor configuration. The abrasive's maximum operating speed is 26,000 RPM. Confirm secure mounting engagement, shank fit, and compatibility with the selected rotary tool before operation.

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