Key Features
Clean Edge Finish The Festool HW R1-OFK 500 Z1 roundover cutter mounts directly on the spindle for very good run-out accuracy, which helps leave a cleaner rounded edge with less cleanup after routing. Single Cutting Edge The single-edged design helps reduce heat buildup, which matters most when routing across the grain where scorch marks can ruin an otherwise good edge. Works in Tight Profiles Its low installation height and flush ball bearing mount make it easier to round edges in rebates or on stacked panels where bulkier router bits can get in the way.
Overview
The Festool HW R1-OFK 500 Z1 Roundover Cutter is a router bit made for delicate edge-rounding work on solid wood and plastic edging. This is a roundover cutter designed for rounding small edges cleanly and consistently. Model Number: 578376. If you are doing finish work where a heavy profile would look out of place, this bit is built for that lighter touch.
What makes this cutter matter is control. With a 27 mm diameter, 1 mm radius, and a single cutting edge, it is aimed at small, precise edge treatment rather than aggressive material removal. That 1 mm roundover is the kind of profile you use when you want the edge to feel finished without obviously changing the shape of the part. It is especially useful on trim details, finished solid wood parts, and plastic edge material where a subtle break on the corner looks better than a sharp arris.
Festool calls out the direct spindle fit as a key part of the design, and that is worth paying attention to. Better run-out accuracy means the cutter tracks more true, which helps produce a neater routing finish. On a small-profile bit like this, accuracy is a big deal because even slight wobble shows up fast in the final edge. The result is a cleaner pass and less sanding or touch-up afterward.
The single-edged Z1 layout is not just a spec line. In real use, it helps limit heat buildup, which can reduce scorch marks when routing across the grain. That is a practical advantage if you are working on visible finish parts where burn marks are a pain to remove without changing the profile. Festool also notes that the radius transitions into a 5° run-out on the router blade to help protect the surface, which is another sign this bit is built for finish quality, not rough shaping.
This cutter is also designed to work where space is limited. The low installation height and flush ball bearing mount make it possible to route in rebates or on a stack of panels without the bit getting awkward or forcing a setup change. That makes it a good fit for edge work on assembled pieces, layered stock, or parts where clearance around the cut is tight.
The compatibility cue is right in the product name: the Festool HW R1-OFK 500 Z1 Roundover Cutter is built for the OFK 500 platform. It is installed with a screw and is supplied without the bearing ball, so that is worth checking before setup if you are replacing an existing cutter. For woodworkers, finish carpenters, cabinet installers, and serious DIY users doing light profiling and edge finishing, this is the kind of specialty router bit that does one job and does it properly.
Small Radius, Finished Look
This bit is built for edge work that needs to look intentional, not oversized. A 1 mm radius is subtle, which is exactly the point when you want to soften an edge without making the profile look decorative.
- Designed for rounding solid wood and plastic edging
- 27 mm cutter diameter with a 1 mm radius for light profiling
- Low installation height helps when routing rebates or stacked panels
Key Specifications
| Tool Type | Roundover cutter |
|---|---|
| Cutter Diameter (mm) | 27.00 mm |
| Radius (mm) | 1.00 mm |
| Number of Cutting Edges | 1 |
| Cutting Edge Design | Single-edged (Z1) |
| Installation | Easy installation with a screw |
| Bearing Ball | Not included |
| Material Compatibility | Solid wood, plastic edging |
Compatibility
Router Platform Designed for the Festool OFK 500, as indicated by the R1-OFK 500 product designation. Bearing Setup Supplied without bearing ball, so confirm your existing setup before installation or replacement.
Built For
Woodworking Finish Carpentry Cabinet Work Edge Finishing Plastic Edging Solid Wood Trim
Pro Tip
On a small 1 mm roundover like this, feed rate matters more than force. Let the single cutting edge do the work and keep the pass steady, especially across the grain, so you get the cleaner finish this bit is designed for.
Tool Nut’s Take
Tool Nut’s Take
Festool HW R1-OFK 500 Z1 Roundover Cutter for clean, subtle edge work
This is a purpose-built finishing bit for users who care more about edge quality and control than flashy profile size.
- Who it’s for: Woodworkers, trim carpenters, and cabinet guys using an OFK 500 for light roundover work on visible edges.
- Why it stands out: The direct spindle fit, single-edge design, and low installation height all point to one thing: cleaner small-radius results where detail matters.
- Worth knowing: This is not a general-purpose big-profile router bit. It is a specialized cutter for a subtle 1 mm roundover, and it comes without the bearing ball.
Common Questions
- What material is this roundover cutter meant for? It is intended for rounding plastic edging and solid wood edges.
- What size profile does it cut? This cutter has a 1.00 mm radius and a 27.00 mm cutter diameter.
- How many cutting edges does it have? It uses a single cutting edge, listed as Z1.
- Does it include the bearing ball? No. Festool lists this cutter as supplied without the bearing ball.
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