United Abrasives Tapered Cartridge Roll | 38312 | 1/2" Diameter | 60 Grit | Sold by Box of 100

For removing machining burrs, smoothing rough metal edges, and preparing angled recesses for further finishing, the United Abrasives 38312 Tapered Cartridge Roll delivers targeted abrasive cutting action in a compact, tapered configuration. Featuring a 1/2" base diameter, 1" length, and 60-grit premium aluminum oxide abrasive, this cartridge roll is suited to deburring, flash removal, and coarse-to-intermediate surface blending. Its full-taper profile narrows toward the tip, making it useful for sanding internal corners, fillets, tapered openings, and recessed contours that are difficult to reach with straight cylindrical cartridge rolls. The 60-grit abrasive provides the cutting action needed to reduce machining marks and surface irregularities before finer sanding operations.

The United Abrasives 38312 features a multi-layer, self-dressing construction that exposes fresh, sharp abrasive grain as successive layers wear away, helping maintain effective sanding performance. Its 1/8" arbor opening requires a compatible cartridge roll mandrel for secure mounting on an appropriately rated rotary tool. The 26,000 RPM maximum operating speed establishes the abrasive's upper speed limit and must be considered when selecting a die grinder and mounting accessory. Compared with the smaller 3/8" diameter tapered configuration, the 1/2" base diameter provides additional abrasive contact toward the wider end of the roll while retaining a narrowing tip for detailed work. Suitable for ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel, the 38312 is supplied in a box of 100 for recurring machining, fabrication, and maintenance applications.

Type: Tapered Cartridge Roll | Part Number: 38312 | Abrasive Material: Premium Aluminum Oxide | Base Diameter: 1/2" | Length: 1" | Arbor: 1/8" | Grit: 60 | Max RPM: 26,000 | Quantity: 100 per Box | Material Application: Ferrous Metals, Non-Ferrous Metals, Stainless Steel, High-Tensile Steel

Features:

• Premium aluminum oxide abrasive grain supports sanding, deburring, and surface preparation on ferrous and non-ferrous metals.
• 60-grit abrasive offers coarse-to-intermediate cutting action for removing burrs, localized flash, and rough machining marks.
• Full-taper design narrows toward the tip to facilitate access to angled recesses, tight corners, internal fillets, and contoured metal features.
• 1/2" base diameter provides additional abrasive contact near the wider end of the roll for accessible recessed surfaces.
• Compact 1" abrasive length helps operators position the roll in short cavities and confined workpiece features.
• Multi-layer, self-dressing construction exposes fresh cutting grain as successive abrasive layers wear away.
• 1/8" arbor opening provides a defined mounting dimension for selecting an appropriately sized cartridge roll mandrel.
• Quick removal and installation facilitate roll changes, while the box quantity of 100 supports regular abrasive inventory replenishment.

Applications:

• Machining and CNC operations - Removing burrs and blending tool marks inside angled openings, recessed corners, and machined contours.
• Tool and die manufacturing - Sanding internal fillets, tapered cavities, and accessible tooling recesses that require a narrowing abrasive profile.
• Metal fabrication - Cleaning up localized cutting flash and rough edges inside irregularly shaped metal features.
• Stainless steel and alloy steel processing - Performing preliminary deburring and surface preparation on contoured stainless steel and high-tensile steel components.
• Industrial equipment maintenance - Smoothing small recessed areas, internal corners, and metal fittings during component repair and refurbishment.

FAQs:

• Q: What is the United Abrasives 38312 Tapered Cartridge Roll used for?
  A: The 38312 is used for sanding, deburring, flash removal, and surface blending in angled recesses, internal corners, and contoured metal areas. Its 60-grit abrasive is particularly useful for initial surface preparation before progressing to finer finishing grades.
• Q: How does the United Abrasives 38312 differ from the 38300?
  A: Both models have a 1" length, 60-grit abrasive, 1/8" arbor opening, and 26,000 RPM maximum operating speed. The 38312 has a larger 1/2" base diameter, while the 38300 has a 3/8" base diameter. Choose according to the available clearance and the abrasive contact area needed.
• Q: Should I choose the 60-grit 38312 or the 80-grit 38313?
  A: Choose the 38312 when removing noticeable burrs, flash, or rough machining marks is the priority. The finer 80-grit 38313 is better suited to intermediate sanding and reducing scratches after initial material removal.
• Q: What is the advantage of a tapered cartridge roll over a straight cartridge roll?
  A: A tapered cartridge roll narrows toward its tip, helping operators reach angled recesses, corners, and irregular contours. A straight cartridge roll maintains a cylindrical abrasive surface and is generally more suitable when consistent contact along straight side walls is needed.
• Q: Can the United Abrasives 38312 be used on stainless steel?
  A: Yes. United Abrasives lists stainless steel and high-tensile steel among the suitable workpiece materials, along with ferrous and non-ferrous metals. When preventing cross-contamination is important, use abrasives dedicated to stainless steel.
• Q: What mandrel and operating speed are required for part number 38312?
  A: The 38312 has a 1/8" arbor opening and a maximum operating speed of 26,000 RPM. Select a manufacturer-approved mandrel with the correct mounting diameter, secure engagement, and appropriate speed rating. Confirm the recommended mandrel part number before ordering.

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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