For smoothing machining marks and refining wider recessed metal surfaces, the United Abrasives 38121 Straight Cartridge Roll offers intermediate abrasive cutting action with an extended cylindrical working area. Featuring a 3/4" diameter, 2" length, and 80-grit premium aluminum oxide abrasive, this cartridge roll is suited to light deburring, surface blending, and preparing metal components for finer finishing operations. The straight design provides access to internal channels, fillets, recessed side walls, and the bottoms of accessible dead-end holes. Its 80-grit abrasive produces a finer sanding pattern than the corresponding 40- and 60-grit models, making it useful for reducing residual tool marks and scratches after initial material removal.
United Abrasives uses a multi-layer, self-dressing construction that exposes fresh cutting abrasive as successive layers wear away, helping maintain effective sanding action. The 3/16" arbor opening requires a properly matched cartridge roll mandrel for secure mounting on compatible rotary equipment. Its 18,000 RPM maximum operating speed establishes the abrasive's upper speed limit, an important consideration when choosing a die grinder and mandrel. The 2" abrasive length provides additional working contact along extended grooves compared with shorter 3/4" diameter cartridge rolls, while the wider diameter offers useful sanding coverage where clearance permits. Suitable for ferrous metals, non-ferrous metals, stainless steel, and high-tensile steel, the 38121 is sold in a box of 100.
Type: Straight Cartridge Roll | Part Number: 38121 | Abrasive Material: Premium Aluminum Oxide | Diameter: 3/4" | Length: 2" | Arbor: 3/16" | Grit: 80 | Max RPM: 18,000 | Quantity: 100 per Box | Material Application: Ferrous Metals, Non-Ferrous Metals, Stainless Steel, High-Tensile Steel
Features:
- Premium aluminum oxide grain supports sanding, deburring, and surface blending on ferrous and non-ferrous metals.
- 80-grit abrasive helps refine machining marks and reduce scratches remaining after coarser sanding operations.
- 3/4" diameter provides broad abrasive contact for accessible internal grooves, recessed surfaces, and larger metal openings.
- Extended 2" cylindrical length allows sanding along elongated channels and internal side walls where sufficient clearance is available.
- Straight profile is useful for working along internal fillets, recessed contours, and the bottoms of accessible dead-end holes.
- Multi-layer, self-dressing construction exposes fresh abrasive grain as successive layers wear away.
- 3/16" arbor configuration provides a defined mounting size for selecting a compatible cartridge roll mandrel.
- Quick removal and installation facilitate abrasive changes, while the box quantity of 100 supports recurring metalworking operations.
Applications:
- Machining and CNC finishing - Blending cutter marks and removing small burrs along wider internal grooves and machined recesses.
- Tool and die manufacturing - Refining accessible tooling cavities, internal fillets, and elongated recessed contours.
- Metal fabrication - Smoothing localized rough edges and preparing recessed metal surfaces after initial deburring.
- Stainless steel and alloy steel processing - Performing intermediate sanding and localized surface blending on stainless steel and high-tensile steel components.
- Industrial equipment maintenance - Refining accessible recessed features on machinery components, fittings, and metal repair parts.
FAQs:
- Q: How does the United Abrasives 38121 compare with the 38120?
A: Both models have a 3/4" diameter, 2" length, 3/16" arbor opening, and 18,000 RPM maximum operating speed. The 38121 uses 80-grit abrasive for intermediate sanding and surface refinement, while the 38120 uses coarser 60-grit abrasive for greater material removal. - Q: What is the difference between the 38121 and 38114 cartridge rolls?
A: Both feature a 3/4" diameter, 80-grit aluminum oxide abrasive, 3/16" arbor, and 18,000 RPM maximum speed. The 38121 has a 2" abrasive length, while the 38114 is 1-1/2" long. The longer roll provides additional sanding contact along extended surfaces where working clearance allows. - Q: Can the 38121 remove heavy burrs?
A: Its 80-grit abrasive is better suited to light deburring, blending, and intermediate surface preparation. For pronounced burrs or substantial material removal, a coarser option such as the 40-grit 38119 may be preferable before finishing with the 38121. - Q: Is the United Abrasives 38121 suitable for stainless steel?
A: Yes. United Abrasives lists stainless steel and high-tensile steel as suitable materials, along with ferrous and non-ferrous metals. When avoiding contamination from carbon steel is important, use abrasives dedicated to stainless steel. - Q: What mandrel is required for part number 38121?
A: The cartridge roll has a 3/16" arbor opening and requires a compatible cartridge roll mandrel. Confirm the manufacturer's recommended mandrel part number, secure mounting engagement, and the mandrel's tool and speed compatibility before use. - Q: What are the box quantity and maximum operating speed?
A: United Abrasives 38121 is sold in a box of 100 straight cartridge rolls. Its maximum operating speed is 18,000 RPM, and the rotary tool and mandrel must meet the manufacturer's mounting and speed requirements.
Available Variations and Specifications
| SKU (Qty 100) |
Base Dia | Length | Arbor | Grit | Max RPM | Mandrel Part # |
|---|---|---|---|---|---|---|
| 38070 | 1/2" | 1-1/2" | 3/16" | 36 | 26,000 | 95107 |
| 38071 | 1/2" | 1-1/2" | 1/8" | 40 | 26,000 | 95104 |
| 38072 | 1/2" | 1-1/2" | 1/8" | 50 | 26,000 | 95104 |
| 38073 | 1/2" | 1-1/2" | 1/8" | 60 | 26,000 | 95104 |
| 38074 | 1/2" | 1-1/2" | 1/8" | 80 | 26,000 | 95104 |
| 38076 | 1/2" | 1-1/2" | 1/8" | 120 | 26,000 | 95104 |
| 38080 | 1/2" | 2" | 1/8" | 60 | 26,000 | 95103 |
| 38081 | 1/2" | 2" | 1/8" | 80 | 26,000 | 95103 |
| 38083 | 1/2" | 2" | 1/8" | 120 | 26,000 | 95103 |
| 38087 | 1/2" | 2" | 3/16" | 60 | 26,000 | 95106 |
| 38088 | 1/2" | 2" | 3/16" | 80 | 26,000 | 95106 |
| 38089 | 1/2" | 2" | 3/16" | 120 | 26,000 | 95106 |
| 38093 | 5/8" | 1-1/2" | 1/8" | 60 | 18,000 | 95104 |
| 38094 | 5/8" | 1-1/2" | 1/8" | 80 | 18,000 | 95104 |
| 38095 | 5/8" | 1-1/2" | 1/8" | 120 | 18,000 | 95104 |
| 38112 | 3/4" | 1-1/2" | 3/16" | 40 | 18,000 | 95107 |
| 38113 | 3/4" | 1-1/2" | 3/16" | 60 | 18,000 | 95107 |
| 38114 | 3/4" | 1-1/2" | 3/16" | 80 | 18,000 | 95107 |
| 38119 | 3/4" | 2" | 3/16" | 40 | 18,000 | 95106 |
| 38120 | 3/4" | 2" | 3/16" | 60 | 18,000 | 95106 |
| 38121 | 3/4" | 2" | 3/16" | 80 | 18,000 | 95106 |
| 38122 | 3/4" | 2" | 3/16" | 120 | 18,000 | 95106 |
| 38126 | 1" | 1-1/2" | 1/4" | 60 | 18,000 | 95102 |
| 38127 | 1" | 1-1/2" | 1/4" | 80 | 18,000 | 95102 |
| 38128 | 1" | 1-1/2" | 1/4" | 120 | 18,000 | 95102 |
| 38132 | 1" | 2" | 1/4" | 60 | 18,000 | 95101 |
| 38133 | 1" | 2" | 1/4" | 80 | 18,000 | 95101 |
| 38134 | 1" | 2" | 1/4" | 120 | 18,000 | 95101 |
Looking for more information about United Abrasives Straight Cartridge Roll? For help choosing the correct United Abrasives Straight Cartridge Rolls for your application, please call (800) 608-5210 or email info@intlairtool.com
- Type
- Straight Cartridge Roll
- Diameter (in.)
- 3/4
- Length (in.)
- 2
- Arbor Hole (in.)
- 3/16
- Grit
- 80
- RPM
- 18000
- Mandrel Part
- 95106
- Box of
- 100
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