How to Make Knife Handle Scales from Acrylic, Kirinite & Wood

Knife handle scales are the two flat pieces that sandwich a full-tang blade to form the grip. Making your own lets you choose from a much wider range of materials than any off-the-shelf knife offers — from vivid Kirinite acrylics to stabilised wood burls to solid acrylic blocks. The process is straightforward and requires only basic tools.

Choosing material

Acrylic and Kirinite are the most popular choices for makers — they are waterproof, durable, available in hundreds of colours and patterns, and look spectacular when polished. Wood scales (stabilised is best — the resin impregnation makes them waterproof and dimensionally stable) offer a more traditional look. Reconstituted stone, G10 fibreglass and Micarta are all excellent functional choices for hard-use knives.

Scale blanks should be slightly oversize in every dimension — at least 3mm wider and longer than the tang, and thick enough to be comfortable in the hand (typically 8-12mm per side for a full-size knife).

Shaping

Rough-cut the blanks to approximate shape on a bandsaw or with a coping saw, leaving 2-3mm of waste around the tang outline. Acrylic and Kirinite cut cleanly on a bandsaw with a fine-toothed blade at moderate speed. Do not force the cut — let the blade do the work to avoid chipping.

Mark the pin hole positions by laying the tang on the blank and using the existing holes as a drill guide. Drill the pin holes with a brad-point bit matched to your pin diameter (typically 3mm or 4mm). Drill from the show face of each scale to minimise chip-out on the visible surface.

Attaching

Roughen the tang and the inner face of each scale with 80-grit sandpaper for a strong bond. Mix two-part epoxy (slow-set, 30 minutes or longer, for working time), apply it to both the tang and the inner faces of the scales, insert the pins through all layers, and clamp firmly. Wipe away all squeeze-out immediately — cured epoxy on the show face is difficult to remove without scratching the scales.

Leave clamped for a full 24 hours. Brass, stainless steel, or mosaic pins all work well. Corby bolts (threaded fasteners designed for knife handles) provide a mechanical lock in addition to the epoxy bond — these are preferred for hard-use knives.

Profiling and finishing

Once the epoxy has cured, shape the handle profile. A belt sander or disc sander removes material quickly — work slowly and check the fit in your hand frequently. Round the edges and contour the grip to your preference. For acrylic scales, progress through sandpaper grits from 120 up to 800 or higher, then polish with a fine buffing compound for a glass-like shine. Wood scales can be finished with oil, wax, or CA adhesive (which gives a durable, water-resistant gloss).

Finish the pins flush with the scale surface — sand them level, then polish them along with the scales. Brass pins develop a warm patina over time; stainless stays bright.