Edge Beading Bits, 2 Flute, 3/16" Radius, 1-1/8" Diameter, 1/4" Shank, 2-1/4" Length

Bosch Edge Beading Bit For Clean Profiling

Bosch edge beading bit gives you a dedicated profiling tool for putting a consistent bead on workpiece edges. The router bit is identified as a Bosch carbide tipped edge beading bit with manufacturer part number 85666M, so you know exactly what profile and geometry you are setting up for during layout and tooling changes. The bit has a 3/16 inch radius, which cuts a small, controlled bead that suits furniture parts, trim, and detailed edging where a modest profile is preferred. Its 1-1/8 inch diameter creates a substantial cutting circle that supports a smooth, flowing bead along longer edges. The bit length of 2-1/4 inches gives enough body for solid chucking in the collet while maintaining good visibility at the router table. As a router bit in the Profiling class, it is geared toward shaping exposed edges rather than joinery cuts.

Edge Beading Details That Support Your Work

• The 3/16 inch radius produces a refined bead that adds edge detail without overwhelming narrow stock, which helps when matching existing trim or creating understated profiles on casework.
• The 1-1/8 inch cutting diameter provides a broad cutting path that helps the bead transition smoothly into the shoulder, giving edges a finished look on visible work surfaces.
• The 2-1/4 inch overall length supplies adequate shank engagement in the collet while keeping the cutting portion compact, which supports stable cuts on router tables or handheld passes.
• The 2 flute cutting design means the bit shears with two cutting edges each rotation, which promotes a balanced cut and is important for cleaner edges on profiling passes.
• The carbide tipped construction puts wear-resistant carbide at the cutting edges, extending tool life and helping maintain a crisp beading profile over many linear feet of edging.
• The ball bearing pilot at the tip guides the bit against the workpiece edge, which simplifies following straight or curved templates when adding beaded profiles to furniture or trim.

Shank, Pilot, And Profiling Setup Details

The bit uses a 1/4 inch shank, which fits routers and trimmers designed for that shank size and allows use in lighter routing setups where a smaller collet is standard. With the bit classified under Profiling, its geometry is optimized for shaping edges rather than heavy stock removal, so it fits naturally into finishing passes once stock is milled to size. The ball bearing pilot at the nose of the bit rides along the workpiece edge or pattern, controlling the path of the cutting edges to follow curves or straight runs without additional fences. Because the cutter is carbide tipped, the cutting edges hold their shape through repeated profiling operations, supporting consistent bead size and shape across multiple parts in a project run.

Using This Router Bit For Edge Beading Work

Where This Edge Beading Router Bit Performs

This router bit is described as an edge beading bit used to add attractive edging on new pieces, so it suits work where exposed edges need a defined bead. The 3/16 inch radius gives a modest profile that fits cabinet doors, shelves, and trim where a smaller bead improves appearance without removing too much material from the edge. Because it also matches many older molding, the profile can be used in repair or extension work where existing beaded molding needs to continue across new sections. The bit sits in the Bits, Blades and Cutters Profiling category, placing it among tools meant for visible edge shaping rather than hidden structural joints. With a 1-1/8 inch diameter and ball bearing pilot, it also works on curved or straight edges where the bearing can trace a template or existing surface.

Details That Support Repeatable Beaded Profiles

The 2 flute design gives two cutting edges around the bit, so each pass balances cutting forces and helps maintain a consistent bead around the entire edge length. The carbide tipped construction keeps the cutting geometry accurate during extended use, which matters when multiple cabinet doors or trim pieces must share the same beading profile for a uniform installation. The 1/4 inch shank ties the bit to routers and trimmers that accept that shank size, simplifying changes between other 1/4 inch shank tooling during a profiling sequence. Its 2-1/4 inch total length offers enough reach for typical edge workpieces while keeping leverage under control at the collet, which supports smoother tracking along the bearing. The ball bearing pilot controls lateral position against the edge or template, helping the profile land in the same place each time when repeating parts or following existing molding lines.

Common Questions About Bosch Router Bit 85666M

Select This Edge Beading Bit For Profiling

The Bosch router bit 85666M provides a 3/16 inch radius edge beading profile with a 1-1/8 inch diameter, giving you a defined but modest bead for furniture, cabinet, or molding work. Its carbide tipped cutting edges and 2 flute design support repeatable profiling passes when edging multiple parts. With a 1/4 inch shank and ball bearing pilot, it fits routing setups built around that shank size and allows guided profiling along edges or templates. For woodworking that calls for matching older molding or adding fresh edging on new pieces, this edge beading bit offers a defined profile geometry ready to be put into regular shop rotation.