The Ergotron Low-Profile Top-Mount C-Clamp (98-478-224) provides a space-saving mounting solution for compatible Ergotron monitor arms. Designed to attach from above the desk surface, this clamp is suitable for workstations where access beneath the desk is limited or a streamlined mounting arrangement is preferred.
Finished in matte black, the clamp is designed for worksurfaces measuring 18–25 mm thick. Its low-profile construction helps minimize extra bulk around the desk edge, making it a practical accessory for office workstations, home offices and sit-stand desks.
Key Features
- Low-profile design: Attaches above the desk surface without unnecessary bulk.
- Matte black finish: Coordinates with compatible black Ergotron monitor arms.
- Specified desk thickness: Designed for worksurfaces 18–25 mm (0.71–0.98 inches) thick.
- Simple assembly: Designed to assemble using one screw.
- Compatible mounting accessory: Works with select Ergotron LX and MXV desk monitor arms.
Technical Specifications
| Brand | Ergotron |
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| Product Name | Low-Profile Top-Mount C-Clamp |
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| Manufacturer Part Number | 98-478-224 |
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| Color | Matte black |
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| Mounting Type | Top-mount desk C-clamp |
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| Compatible Surface Thickness | 18–25 mm (0.71–0.98 inches) |
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| Installation Clearance | Approximately 20 mm behind the desk edge |
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| Compatible Monitor Arms | Ergotron MXV Desk Arm, LX Desk Arm and LX Dual Direct Arm in compatible configurations |
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| Compatible Part Numbers | 45-625-216, 45-625-224, 45-626-216, 45-626-224, 45-627-216 and 45-627-224 |
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| Approximate Weight | 1.80 lb (0.82 kg) |
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| Package Contents | Low-profile clamp base and attachment hardware |
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| Limited Warranty | 10 years |
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| UPC | 698833082357 |
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Compatibility and Installation
Before purchasing, confirm the exact model of your Ergotron monitor arm and measure the desk thickness. The 98-478-224 clamp is intended for compatible LX and MXV configurations and supports surfaces measuring 18–25 mm thick. Allow approximately 20 mm of clearance behind the desk edge for installation.
This product is a replacement or alternative mounting clamp, not a complete monitor arm. Confirm that your existing arm supports this clamp style before ordering.
DC Supplies Product Note
For a successful installation, verify the monitor arm model, desk thickness and available rear clearance. Compatibility may vary by mounting configuration, so check the manufacturer's compatibility information if you are replacing an existing clamp.
Frequently Asked Questions
1. What is the Ergotron 98-478-224?
It is a matte black Low-Profile Top-Mount C-Clamp designed for compatible Ergotron desk monitor arms.
2. What desk thickness does this clamp support?
It is designed for worksurfaces between 18 mm and 25 mm thick (0.71–0.98 inches).
3. Which Ergotron monitor arms are compatible?
Compatible models include select MXV Desk Arms, LX Desk Arms and LX Dual Direct Arms. Check the specific arm part number before purchasing.
4. How much clearance is needed behind the desk?
Approximately 20 mm of clearance behind the desk edge is required for installation.
5. Does the package include a monitor arm?
No. The package contains the low-profile clamp base and attachment hardware. The monitor arm is sold separately.
6. What warranty does the product carry?
The listed limited warranty is 10 years. Confirm applicable warranty terms with the seller or manufacturer.
