Freud Router Bit 85-384 3/4 Inch Radius (Solid Surface Under Rounding Bullnose Edge TiCo Carbide 1/2 Inch Shank Steel Bearing 16000 RPM)

Freud 85-384 3/4-Inch Radius Solid Surface Under Rounding Router Bit

The Freud 85-384 3/4-Inch Radius Solid Surface Under Rounding Router Bit is a specialty edge-profiling woodworking tool engineered to rout the lower undercut radius when shaping full bullnose profiles on composite countertops and custom millwork. Operating at rotational speeds up to 16,000 RPM with a 1/2-inch shank, 1-inch carbide cutting height, 2-5/8-inch pilot bearing diameter, and 3-3/8-inch overall length, this dual-flute bit utilizes TiCo hi-density carbide cutters and a Perma-SHIELD non-stick thermal coating. Designed for handheld portable routers, this under-rounding cutter solves lower edge tear-out, seam overhang misalignments, and tedious hand-sanding bottlenecks across commercial Corian, Avonite, and acrylic slab fabrications.

Best Used For:

• Full Bullnose Countertop Undercutting: Milling the bottom 3/4-inch radius undercut profile on Corian and Avonite slabs in combination with a top rounding-over bit for full bullnose edges.
• Custom Millwork & Vanity Edge Shaping: Profiling smooth bottom edge radii on thick solid surface window sills, island tops, and commercial reception desks.
• Handheld Portable Router Undercutting: Executing controlled, chatter-free undercut profiling passes on site using 1/2-inch collet routers guided by the 2-5/8-inch steel bearing.

Key Performance & Safety Features

• 3/4-Inch Precision Undercut Radius: Shapes an exact 3/4-inch bottom radius profile to create a smooth, comfortable lower lip on thick composite decks.
• High-Strength Steel Pilot Ball Bearing: Precision-ground 2-5/8-inch guide bearing rides smoothly against workpiece edges for chatter-free depth control.
• TiCo Hi-Density Micro-Grain Carbide: Titanium-cobalt carbide cutting edges resist extreme thermal degradation generated by dense acrylic and polyester resins.
• 16,000 RPM Maximum Speed Rating: Dynamically balanced cutter body engineered specifically for large-diameter profile routing in handheld power tools.
• Perma-SHIELD Thermal Non-Stick Coating: Protective red fluoropolymer coating prevents resin buildup, glue adhesion, and motor drag under continuous loading.
• 1/2-Inch Heavy-Duty Steel Shank: Precision-ground shank provides maximum clamping surface area in router collets to eliminate vibration chatter under heavy cuts.

What's Included

• (1) Freud 85-384 3/4 in. Radius Solid Surface Under Rounding Router Bit (1/2 in. Shank)
• (1) Precision Steel Pilot Ball Bearing (Pre-Installed)

Technical Specifications

Pro-Tip: Ensure your router speed is dialled down to 16,000 RPM or lower due to the large 2-5/8-inch pilot bearing diameter, and take multiple light passes to avoid heat buildup on solid surface edge seams.