Engraving Cutter Blank Sizes: 1/8 vs 11/64 vs 1/4 Inch
By Premium CNC & Router Bits for Precision Cutting | Published: 2026-11-05
Category: Buying Guides
Compare 1/8, 11/64, and 1/4 inch engraving cutter blanks by shank, length, and split length so you can grind the right geometry for your CNC work.
Quick answer
Choose the 1/8 x 1-1/2 inch blank for small, short-reach engraving where you want a compact tool; choose the 11/64 x 6-1/2 inch blank when you need a longer shank with a 3/4 inch split for custom angle grinding; choose the 1/4 x 6-1/2 inch blank for heavier cuts and more rigidity in a standard router collet.
Shank diameter sets your collet and rigidity
The shank diameter is the first decision because it determines which collet you need and how much rigidity the tool has. A 1/8 inch shank fits the common 1/8 inch collet used on many compact CNC spindles and trim routers. An 11/64 inch shank is slightly larger and requires a matching collet, so check your spindle before ordering. A 1/4 inch shank is the standard size for most router collets and gives the most rigidity of the three.
If your spindle only accepts 1/8 inch tooling, the 1/8 x 1-1/2 inch blank is the practical choice. If you have a 1/4 inch collet, the 1/4 x 6-1/2 inch blank avoids the need for a reducing sleeve and provides a stiffer setup for deeper cuts.
Overall length and split length change reach and grinding room
Overall length affects how far the tool can reach and how much shank remains in the collet. The 1/8 x 1-1/2 inch blank is short, so it suits shallow engraving where you do not need much reach. The 11/64 x 6-1/2 inch and 1/4 x 6-1/2 inch blanks are both 6-1/2 inches long, giving you more shank to hold and more room to shape the cutting end.
Split length is the portion of the blank that is already half-round and ready for grinding. The 1/8 inch blank has a 0.44 inch split, while the 11/64 and 1/4 inch blanks each have a 3/4 inch split. A longer split gives you more material to work with when grinding a custom angle, but it also means more of the blank is reduced in diameter. If your geometry needs a long, gradual taper, the 3/4 inch split is the better starting point.
When the catalog does not list a specification
The supplied catalog facts do not list the carbide grade, coating, or maximum grinding speed for these blanks. That absence is a decision limitation: if your process depends on a specific carbide grade or coating, ask the supplier before ordering rather than assuming. For general custom angle grinding, the listed shank, overall length, and split length are the dimensions you need to match to your collet and engraving depth.
Decision rules for choosing an engraving cutter blank
- Match the shank to your collet first: If your spindle has a 1/8 inch collet, choose the 1/8 x 1-1/2 inch blank. If it has a 1/4 inch collet, choose the 1/4 x 6-1/2 inch blank. For an 11/64 inch collet, choose the 11/64 x 6-1/2 inch blank. Do not force a larger shank into a smaller collet. Confirm your collet size before comparing lengths.
- Choose split length by your grinding plan: For a short, simple edge or a small touch-up, the 0.44 inch split on the 1/8 inch blank is enough. For a longer custom angle or a more gradual taper, choose the 3/4 inch split on the 11/64 or 1/4 inch blank. A longer split gives more grinding room but removes more material.
- Use overall length to set reach and rigidity: The 1-1/2 inch overall length of the 1/8 inch blank keeps the tool compact for shallow work. The 6-1/2 inch blanks give more reach and more shank to hold, but a longer tool can flex more if you push it hard. Keep the tool as short as your engraving depth allows.
- Pick 1/4 inch for heavier cuts: When your engraving job involves deeper cuts or harder materials, the 1/4 x 6-1/2 inch blank offers the most rigidity of the three. The 1/8 inch blank is better suited to light, detailed work. Rigidity matters more as cut depth increases.
Product facts
- 11/64 x 6-1/2″ Engraving Cutter Blank: 11/64 inch shank, 6-1/2 inch overall length, 3/4 inch split length, solid carbide, half-round. The longer shank and 3/4 inch split give you more grinding room for custom angles while still fitting a 11/64 inch collet.
11/64 x 6-1/2″ Engraving Cutter Blank - 1/8 x 1-1/2″ Engraving Cutter Blank: 1/8 inch shank, 1-1/2 inch overall length, 0.44 inch split length, solid carbide, half-round. The short overall length and compact split suit small, shallow engraving setups where reach is not needed.
1/8 x 1-1/2″ Engraving Cutter Blank - 1/4 x 6-1/2″ Engraving Cutter Blank: 1/4 inch shank, 6-1/2 inch overall length, 3/4 inch split length, solid carbide, half-round. The 1/4 inch shank fits standard router collets and provides more rigidity for heavier engraving cuts.
Who should choose which blank
Best for
- Engravers with a 1/8 inch collet who need a compact blank for shallow, detailed work
- Shops with an 11/64 inch collet that want a long shank and a 3/4 inch split for custom grinding
- Operators with a 1/4 inch collet who want maximum rigidity for heavier engraving cuts
Not for
- Anyone who needs a pre-ground, ready-to-use engraving bit
- Spindles that cannot accept the matching shank diameter
- Jobs that require a listed carbide grade or coating, since the catalog does not specify one
