Engraver bit Proxxon 28250, stainless steel, 5.16 mm diameter

Proxxon 28250 is an engraver bit made from stainless steel with a 5.16 mm working diameter and a 3/32" (2.35 mm) shank. Engineered for precision engraving, grinding and finishing, this single-piece tool features a consistently even coating of diamond dust to maintain cutting ability on hard and abrasive materials. It is compatible with handheld engravers and rotary tools that accept a 2.35 mm shank and offers corrosion resistance and long-term stability for detailed work.

Advantages

The diamond-dust coating provides uniform abrasive action across the profile, enabling fine detail work and extended tool life on hard substrates. Stainless steel construction of the bit and shank resists corrosion and deformation during normal use, while the 5.16 mm diameter gives a stable contact area for controlled material removal. The single-piece design reduces the risk of loosening or wobble in high-speed rotary applications.

Suitable for

• Engraving and detailing on steel and chrome-cobalt alloys
• Working on glass, stone, ceramics and porcelain
• Shaping, grinding and finishing plastics and composite materials
• Precision deburring and small-area material removal

Key specifications

• Material of tool: stainless steel body with diamond-dust abrasive coating
• Working diameter: 5.16 mm
• Shank diameter: 3/32" (2.35 mm)
• Design: single-piece engraver bit for rotary tools and handheld engravers
• Intended use: engraving, grinding, finishing of hard and brittle materials

How to use

Secure the engraver bit in a compatible collet or chuck that accepts a 2.35 mm shank, ensuring it is clamped straight and firmly. Select an appropriate speed for the material—moderate to high speeds for hard materials such as glass or steel, and lower speeds for more fragile or soft plastics—to avoid overheating and chipping. Apply light, steady pressure and make multiple shallow passes for fine detail or deeper cuts, allowing the abrasive coating to do the work rather than forcing the tool.

Usage recommendations

Wear appropriate eye and respiratory protection when working with abrasive dust and chips. Use coolant or intermittent cutting for prolonged operations on metals to reduce heat buildup and extend tool life. Inspect the bit before each use and replace when the abrasive coating is visibly worn or performance declines.