For smoothing machining marks, refining angled recesses, and removing minor burrs from contoured metal components, the United Abrasives 38320 Tapered Cartridge Roll combines intermediate abrasive cutting action with an extended, narrowing working profile. Featuring a 1/2" base diameter, 1-1/2" length, and 80-grit premium aluminum oxide abrasive, this roll is suitable for surface blending, light deburring, and preparing recessed metal features for finer finishing. Its full-taper design narrows toward the tip, allowing operators to reach internal fillets, angled channels, intersecting surfaces, and contoured openings that may be difficult to sand with a straight cartridge roll. The 80-grit abrasive provides a finer sanding pattern than the corresponding 50- and 60-grit versions while retaining useful cutting action for reducing surface irregularities.
The United Abrasives 38320 incorporates a multi-layer, self-dressing construction, meaning fresh cutting abrasive is exposed as successive layers wear away, helping maintain effective sanding action during use. Its 1/8" arbor opening corresponds to the manufacturer-referenced 95104 cartridge roll mandrel for properly matched mounting. The 26,000 RPM maximum operating speed establishes the abrasive's upper speed limit and must be considered when selecting a compatible die grinder and mandrel. Compared with the shorter 38313 model, its 1-1/2" abrasive length offers additional contact along elongated recessed contours where sufficient clearance is available. Suitable workpiece materials include ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel. The 38320 is supplied in a box of 100 for recurring machining, fabrication, and maintenance operations.
Type: Tapered Cartridge Roll | Part Number: 38320 | Abrasive Material: Premium Aluminum Oxide | Base Diameter: 1/2" | 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 smooth residual machining marks and minor burrs while leaving a finer sanding pattern than coarser grit options.
- Full-taper profile narrows toward the tip, providing abrasive access to angled recesses, internal corners, fillets, and irregular contours.
- 1/2" base diameter provides useful sanding contact near the wider end of the roll while allowing more focused work toward the tip.
- 1-1/2" abrasive length supports sanding along extended recessed contours where adequate working clearance is available.
- Multi-layer, self-dressing construction exposes fresh abrasive grain as successive layers wear away, helping sustain cutting effectiveness.
- 1/8" arbor opening corresponds to the manufacturer-listed 95104 cartridge roll mandrel for compatible mounting.
- Quick removal and installation facilitate abrasive replacement, while the box quantity of 100 supports regular shop replenishment.
Applications:
- Precision machining and CNC finishing - Blending cutter marks and removing small burrs from angled openings, internal fillets, and recessed machined contours.
- Tool and die manufacturing - Refining accessible tooling cavities, tapered surfaces, and elongated internal corners requiring localized abrasive contact.
- Metal fabrication - Smoothing rough edges and reducing minor surface irregularities around contoured metal features after initial deburring.
- Stainless steel and alloy steel processing - Performing intermediate sanding and localized blending on recessed stainless steel and high-tensile steel components.
- Industrial equipment maintenance - Refining accessible angled recesses, metal fittings, and contoured repair surfaces on machinery components.
FAQs:
- Q: What is the difference between United Abrasives 38320 and 38319?
A: Both tapered cartridge rolls feature a 1/2" base diameter, 1-1/2" length, 1/8" arbor opening, and 26,000 RPM maximum operating speed. The 38320 uses 80-grit abrasive for intermediate sanding and surface refinement, while the 38319 uses coarser 60-grit abrasive for greater material removal. - Q: How does the 38320 compare with the shorter 38313?
A: Both models use 1/2" base diameter, 80-grit aluminum oxide abrasive with a 1/8" arbor opening. The 38320 measures 1-1/2" long and is associated with mandrel 95104, while the 38313 measures 1" long and is associated with mandrel 95105. The longer roll provides additional abrasive contact where the workpiece permits. - Q: Should I select the 38320 or the finer 38322?
A: Choose the 80-grit 38320 when minor burrs and visible machining marks still require material removal. The 120-grit 38322 is better suited to refining residual scratches and smoothing surfaces after intermediate sanding. - Q: Why choose a tapered cartridge roll instead of a straight roll?
A: A tapered cartridge roll narrows toward its tip, making it useful for angled corners, internal fillets, and contoured recesses. A straight cartridge roll retains a uniform cylindrical shape that may provide more consistent contact along parallel side walls and straight channels. - Q: Can the United Abrasives 38320 be used on stainless steel?
A: Yes. United Abrasives identifies stainless steel and high-tensile steel as suitable materials, along with ferrous and non-ferrous metals. Use abrasives dedicated to stainless steel when avoiding cross-contamination from previous carbon steel work is important. - Q: Which mandrel is recommended for SKU 38320, and how many rolls are supplied?
A: The manufacturer's 20252026 catalog table identifies mandrel part number 95104 for the 38320. The roll has a 1/8" arbor opening and a maximum operating speed of 26,000 RPM. It is sold in a box of 100 tapered cartridge rolls. Verify secure mounting and appropriate tool compatibility before use.
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.)
- 1/2
- Length (in.)
- 1-1/2
- Arbor Hole (in.)
- 1/8
- Grit
- 80
- RPM
- 26000
- Mandrel Part
- 95104
- Box of
- 100
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