Knife Making & Handle Materials Glossary
Plain-English definitions for terms used when buying, fitting, and finishing knife handle scales.
- Bookmatched pair
- Two consecutive slices cut from the same board and opened like a book so the cut faces face outward. The grain on each scale mirrors the other, creating bilateral symmetry on the finished handle. Produces the most visually dramatic handle pairs.
- Matched pair
- Two scales cut from the same board with consistent species, color, and general figure — but the grain patterns don't mirror each other. More common and less expensive than bookmatched pairs.
- Full-tang knife
- A knife design where the blade steel extends the full length of the handle. Scales are attached to both sides of the tang with pins or bolts. The most common design for fixed-blade knives; the strongest construction.
- Janka hardness
- A standardized measure of wood hardness: the force (in pounds-force, lbf) required to embed a steel ball halfway into the wood surface. Higher Janka numbers mean harder, more wear-resistant wood. Walnut is around 1,010 lbf; purpleheart is 1,860 lbf; lignum vitae reaches 4,500 lbf.
- Stabilized wood
- Wood that has been vacuum-infused with acrylic resin (commonly Cactus Juice) and heat-cured. Stabilization fills the wood's pores with hardened resin, making it harder, more moisture-resistant, and dimensionally stable. Essential for soft or porous species; optional for dense hardwoods.
- Cactus Juice
- A brand name for a stabilizing resin commonly used by knifemakers and woodturners. Wood blanks are placed in the resin under vacuum so the resin is drawn deep into the fibers, then heat-cured in an oven. The result is a fully saturated, hardened blank.
- Burl
- An abnormal rounded growth on a tree trunk or root, caused by stress, injury, or fungal infection. Burl wood has highly irregular, swirling grain that produces dramatic figure. Common burl species for knife handles include maple burl, walnut burl, and oak burl.
- Curly figure (curly maple)
- A wavy or rippled grain pattern caused by undulating wood fibers. Under finish, curly figure produces a chatoyant (light-shifting) shimmer. Curly maple is the most common; curly koa and curly walnut also exist. Best stabilized to prevent the wavy grain from tearing out.
- Quilted figure
- A three-dimensional puckered or padded appearance in the grain, most common in maple. Rarer and typically more valuable than curly figure. Quilted maple stabilized and dyed is one of the most sought-after knife scale materials.
- Birdseye
- Small, eye-shaped circular grain markings found in some maple logs. Caused by the tree's grain attempting to form new growth nodes. True birdseye maple is relatively rare; the density of eyes varies significantly by log.
- Chatoyancy
- The optical effect where wood (or other materials) appear to shift in depth and luminosity as the viewing angle changes. Most visible in curly and quilted figures. The term comes from the French for 'cat's eye.' A primary aesthetic goal in high-end knife handles.
- Figured wood
- Wood with any visually distinctive grain pattern beyond plain straight grain — including curly, quilted, birdseye, burl, ribbon stripe, or ray fleck. Figured pieces command higher prices and are more variable in availability.
- Mosaic pins
- Decorative handle pins made from a tube filled with metal or colored material arranged in a pattern. When cut and polished, the pin face shows a small decorative design. Used as a visual accent on finished knife handles.
- Lanyard hole
- A drilled hole through the butt of a knife handle used to attach a cord or lanyard. Common on outdoor and hunting knives for retention.
- G10
- A high-pressure fiberglass laminate used as a knife handle material. Extremely hard, lightweight, and impervious to moisture. Not a wood but often paired with wood inlays or used as a synthetic alternative. Available in solid colors.
- Micarta
- A composite material made from layers of fabric (canvas, linen, paper) impregnated with resin under pressure. Extremely durable and grip-friendly, especially when wet. A popular synthetic alternative to wood for working and tactical knives.
- Scales
- The two flat pieces of handle material attached to each side of a full-tang knife blade. The term 'scales' is used interchangeably with 'handle slabs' or 'handle material.' Each pair consists of two matching pieces.
- Sapwood
- The younger, outer wood of a tree, between the bark and the darker heartwood. Typically lighter in color. In some species (like box elder), sapwood staining produces desirable figure.
- Heartwood
- The older, denser wood at the center of a tree trunk. Usually darker than sapwood and more resistant to decay. The heartwood is typically the prized portion of exotic knife scale species.
- Ray fleck
- A lustrous, speckled or flake-like pattern visible on quartersawn wood, produced by medullary rays — horizontal wood cells that run radially in the trunk. Most prominent in lacewood and leopardwood, which are valued specifically for this pattern.
- Quarter-sawn
- A milling technique where the log is cut at roughly 90° to the growth rings, rather than straight through. Produces more stable, less prone-to-warp lumber and often reveals figure (like ray fleck) that flat-sawn cuts don't show.
- CA glue finish
- Cyanoacrylate (super glue) applied to a knife handle as a surface finish. Multiple thin coats are applied and sanded between coats to build a hard, smooth, high-gloss surface. Popular for its durability and the way it pops figure in exotic woods.
- Tru-Oil
- A penetrating oil-varnish blend by Birchwood Casey, originally developed for gunstocks. Popular for knife handles because it dries hard, enhances wood color and grain, and is easy to apply and repair.
- Pin holes
- The holes drilled through both the handle scales and the tang to accept handle pins. Typically 1/8" or 3/16" diameter. Precision alignment is important; a drilling jig or drill press ensures the holes line up between both scales.