United Abrasives Tapered Cartridge Roll | 38307 | 3/8" Diameter | 80 Grit | Sold by Box of 100

For blending machining marks inside angled grooves, refining recessed contours, and removing minor burrs from hard-to-reach metal surfaces, the United Abrasives 38307 Tapered Cartridge Roll provides intermediate sanding action with an extended, narrowing abrasive profile. This model features a 3/8" base diameter, 1-1/2" length, and 80-grit premium aluminum oxide abrasive. Its full-taper design helps operators follow internal fillets, tapered openings, corners, and irregularly shaped recesses where a straight cartridge roll may not provide suitable contact. The 80-grit construction is especially useful for smoothing residual machining marks and refining surfaces after initial deburring, offering a finer scratch pattern than the comparable 60-grit version.

The United Abrasives 38307 incorporates a multi-layer, self-dressing construction, which exposes fresh cutting abrasive as successive layers wear away to help maintain effective sanding action. Its 1/8" arbor opening corresponds to the manufacturer-specified 95104 cartridge roll mandrel for compatible mounting. The 26,000 RPM maximum operating speed establishes the upper speed limit for the abrasive and must be considered when selecting a rotary tool and mandrel. Compared with the shorter 38301 model, its 1-1/2" length provides additional abrasive contact along elongated angled features where sufficient clearance is available. United Abrasives identifies ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel as suitable workpiece materials. The 38307 is supplied in a box of 100 for recurring machining and metal finishing operations.

Type: Tapered Cartridge Roll | Part Number: 38307 | Abrasive Material: Premium Aluminum Oxide | Base Diameter: 3/8" | Length: 1-1/2" | Arbor: 1/8" | Grit: 80 | 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 deburring, sanding, and surface blending on ferrous and non-ferrous metal components.
• 80-grit abrasive helps remove light burrs and reduce machining marks while producing a finer sanding pattern than coarser abrasive grades.
• Full-taper profile narrows toward the tip for better access to angled recesses, internal corners, fillets, and contoured metal features.
• 3/8" base diameter offers a compact abrasive working area for localized finishing in relatively narrow openings.
• Extended 1-1/2" length provides additional contact along elongated internal contours compared with shorter tapered cartridge rolls.
• Multi-layer, self-dressing construction exposes sharp, fresh abrasive as successive layers wear away.
• 1/8" arbor opening corresponds to United Abrasives mandrel part number 95104 for appropriately matched mounting.
• Quick removal and installation help facilitate abrasive changes, while the box quantity of 100 supports routine shop replenishment.

Applications:

• Precision machining and CNC finishing - Blending cutter marks and removing small burrs from angled openings, extended internal fillets, and recessed machined features.
• Tool and die manufacturing - Refining tooling cavities, tapered contours, and accessible internal corners requiring a narrowing abrasive shape.
• Metal fabrication - Smoothing localized rough edges and reducing surface imperfections in contoured metal recesses after initial deburring.
• Stainless steel and alloy steel processing - Performing intermediate sanding on recessed stainless steel and high-tensile steel components.
• Industrial equipment maintenance - Refining accessible angled recesses, contoured fittings, and internal metal features during component repair.

FAQs:

• Q: What is the difference between United Abrasives 38307 and 38306?
  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 38307 uses 80-grit abrasive for intermediate sanding and surface blending, while the 38306 uses coarser 60-grit abrasive for more aggressive burr removal.
• Q: How does the 38307 compare with the shorter 38301?
  A: Both models feature a 3/8" base diameter, 80-grit abrasive, and 1/8" arbor opening. The 38307 is 1-1/2" long, while the 38301 is 1" long. The longer model provides additional working contact along deeper contours where sufficient clearance is available.
• Q: When should I choose 80 grit instead of 120 grit?
  A: Choose 80 grit when minor burrs and visible machining marks still require material removal. The finer 120-grit United Abrasives 38308 is better suited to reducing residual sanding scratches and refining surfaces after intermediate blending.
• Q: What is the advantage of a tapered cartridge roll?
  A: The roll narrows toward its tip, helping the abrasive reach angled recesses, internal fillets, and irregular metal contours. Straight cartridge rolls maintain a uniform cylindrical shape and may provide more consistent contact along parallel side walls.
• Q: Which mandrel is specified for United Abrasives part number 38307?
  A: The United Abrasives 2025-2026 catalog identifies mandrel part number 95104 for this 1/8" arbor, 1-1/2" long tapered cartridge roll. Verify secure mounting engagement, shank fit, and operating speed compatibility before use.
• Q: Can the 38307 be used on stainless steel, and how is it packaged?
  A: Yes. United Abrasives lists stainless steel and high-tensile steel among the suitable materials, along with ferrous and non-ferrous metals. The 38307 is sold in a box of 100 tapered cartridge rolls. Use dedicated abrasives where preventing stainless steel contamination is important.

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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