For metalworkers refining angled grooves, recessed corners, and contoured surfaces after initial deburring, the United Abrasives 38339 Tapered Cartridge Roll offers intermediate sanding action in a versatile full-taper configuration. Featuring a 3/4" base diameter, 1-1/2" length, and 80-grit premium aluminum oxide abrasive, this cartridge roll is suited to blending machining marks, removing minor burrs, and preparing metal surfaces for finer finishing. Its tapered profile narrows toward the tip, allowing abrasive contact in angled cavities, internal fillets, and irregular recesses where a straight cartridge roll may be difficult to position. The 80-grit grain offers a finer sanding pattern than the 60-grit version while retaining useful cutting action for intermediate surface preparation.
The United Abrasives 38339 incorporates a multi-layer, self-dressing construction, which exposes sharp, fresh abrasive grain as successive layers wear away, helping maintain effective sanding action. Its 1/8" arbor opening corresponds to the manufacturer-listed 95104 cartridge roll mandrel for appropriately matched mounting on compatible rotary tools. The 18,000 RPM maximum operating speed establishes the abrasive's upper speed limit and is especially important when selecting a die grinder capable of higher speeds. The wider base provides sanding coverage on accessible recessed surfaces, while the narrowing tip helps concentrate contact around angled features. United Abrasives identifies ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel as suitable workpiece materials. The 38339 is supplied in a box of 100 for recurring machining, fabrication, and equipment maintenance applications.
Type: Tapered Cartridge Roll | Part Number: 38339 | Abrasive Material: Premium Aluminum Oxide | Base Diameter: 3/4" | Length: 1-1/2" | Arbor: 1/8" | Grit: 80 | Max RPM: 18,000 | Recommended Mandrel: 95104 | Quantity: 100 per Box | Material Application: Ferrous Metals, Non-Ferrous Metals, Stainless Steel, High-Tensile Steel
Features:
- Premium aluminum oxide abrasive supports sanding, light deburring, and surface blending on ferrous and non-ferrous metal components.
- 80-grit construction helps reduce residual machining marks and small burrs while providing a finer abrasive scratch pattern than coarser grades.
- Full-taper profile narrows toward the tip for access to angled recesses, internal corners, fillets, and contoured metal features.
- 3/4" base diameter offers a wider abrasive contact area near the base for sanding accessible recessed surfaces.
- 1-1/2" abrasive length provides working contact along internal contours while remaining compact enough for localized finishing where clearance permits.
- Multi-layer, self-dressing construction exposes fresh cutting abrasive as successive layers wear away, helping maintain sanding effectiveness.
- 1/8" arbor opening corresponds to the manufacturer-listed 95104 cartridge roll mandrel for correctly matched mounting.
- Quick removal and installation simplify roll replacement during repeated sanding operations, while the box quantity of 100 supports abrasive inventory replenishment.
Applications:
- Precision machining and CNC finishing - Blending machining marks and lightly deburring angled openings, recessed pockets, and internal metal contours.
- Tool and die manufacturing - Refining accessible tooling cavities, tapered surfaces, and internal fillets requiring a narrowing abrasive profile.
- Metal fabrication - Smoothing localized edge irregularities and preparing contoured metal areas after initial burr removal.
- Stainless steel and alloy steel processing - Performing intermediate sanding and surface blending on recessed stainless steel and high-tensile steel components.
- Industrial maintenance and equipment repair - Refining accessible recessed fittings, angled corners, and contoured surfaces on metal machine parts.
FAQs:
- Q: How does United Abrasives 38339 differ from 38338?
A: Both tapered cartridge rolls have a 3/4" base diameter, 1-1/2" length, 1/8" arbor opening, and 18,000 RPM maximum operating speed. The 38339 uses 80-grit abrasive for intermediate sanding and surface blending, while the 38338 uses coarser 60-grit abrasive for more aggressive deburring and material removal. - Q: When should I choose the 38339 instead of the 120-grit 38340?
A: Choose the 38339 when small burrs and visible machining marks still need abrasive cutting. The finer 120-grit 38340 is better suited to reducing scratches and refining surfaces after intermediate sanding. - Q: What does the tapered design offer compared with a straight cartridge roll?
A: Its abrasive profile narrows toward the tip, making it useful for angled recesses, internal corners, and irregular contours. Straight cartridge rolls provide a cylindrical contact surface that may be more suitable for uniform grooves and parallel side walls. - Q: Can United Abrasives 38339 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 abrasives dedicated to stainless steel when preventing cross-contamination from carbon steel is important. - Q: Which mandrel is specified for SKU 38339?
A: The United Abrasives 2025-2026 catalog identifies mandrel part number 95104 for the 1/8" arbor and 1-1/2" length configuration. Verify correct engagement, mounting security, shank compatibility, and applicable speed limits before operation. - Q: What are the maximum operating speed and packaging quantity?
A: United Abrasives 38339 is rated for a maximum operating speed of 18,000 RPM and is sold in a box of 100 tapered cartridge rolls. Confirm mounting accessory requirements separately before ordering.
Available Variations and Specifications
| SKU (Qty 100) |
Base Dia | Length | Arbor | Grit | Max RPM | Mandrel Part # |
|---|---|---|---|---|---|---|
| 38300 | 3/8" | 1" | 1/8" | 60 | 26,000 | 95105 |
| 38301 | 3/8" | 1" | 1/8" | 80 | 26,000 | 95105 |
| 38302 | 3/8" | 1" | 1/8" | 120 | 26,000 | 95105 |
| 38306 | 3/8" | 1-1/2" | 1/8" | 60 | 26,000 | 95104 |
| 38307 | 3/8" | 1-1/2" | 1/8" | 80 | 26,000 | 95104 |
| 38308 | 3/8" | 1-1/2" | 1/8" | 120 | 26,000 | 95104 |
| 38312 | 1/2" | 1" | 1/8" | 60 | 26,000 | 95105 |
| 38313 | 1/2" | 1" | 1/8" | 80 | 26,000 | 95105 |
| 38314 | 1/2" | 1" | 1/8" | 120 | 26,000 | 95105 |
| 38318 | 1/2" | 1-1/2" | 1/8" | 50 | 26,000 | 95104 |
| 38319 | 1/2" | 1-1/2" | 1/8" | 60 | 26,000 | 95104 |
| 38320 | 1/2" | 1-1/2" | 1/8" | 80 | 26,000 | 95104 |
| 38322 | 1/2" | 1-1/2" | 1/8" | 120 | 26,000 | 95104 |
| 38326 | 1/2" | 2" | 1/8" | 60 | 26,000 | 95103 |
| 38327 | 1/2" | 2" | 1/8" | 80 | 26,000 | 95103 |
| 38328 | 1/2" | 2" | 1/8" | 120 | 26,000 | 95103 |
| 38332 | 5/8" | 2" | 1/8" | 60 | 18,000 | 95103 |
| 38333 | 5/8" | 2" | 1/8" | 80 | 18,000 | 95103 |
| 38338 | 3/4" | 1-1/2" | 1/8" | 60 | 18,000 | 95104 |
| 38339 | 3/4" | 1-1/2" | 1/8" | 80 | 18,000 | 95104 |
| 38340 | 3/4" | 1-1/2" | 1/8" | 120 | 18,000 | 95104 |
| 38344 | 3/4" | 2" | 3/16" | 60 | 18,000 | 95106 |
| 38345 | 3/4" | 2" | 3/16" | 80 | 18,000 | 95106 |
| 38346 | 3/4" | 2" | 3/16" | 120 | 18,000 | 95106 |
Looking for more information about United Abrasives Tapered Cartridge Roll? For help choosing the correct United Abrasives Tapered Cartridge Rolls for your application, please call (800) 608-5210 or email info@intlairtool.com
- Type
- Tapered Cartridge Roll
- Diameter (in.)
- 3/4
- Length (in.)
- 1-1/2
- Arbor Hole (in.)
- 1/8
- Grit
- 80
- RPM
- 18000
- Mandrel Part
- 95104
- Box of
- 100
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