Leathercraft glossary: 25 terms explained
Every craft hides behind its vocabulary. Twenty-five definitions, written the way a maker would explain them across the bench — with links to go deeper on each.
Quick answer
The five terms that unlock the rest: veg-tan (bark-tanned, firm, toolable leather), chrome-tan (soft, supple, most of world production), full grain (the intact natural surface — the top grade), saddle stitch (the two-needle hand seam that outlasts machines), and burnishing (friction-polishing a cut edge until it is smooth and glossy). Everything else on this page builds on those five.
Leather vocabulary is old, regional and cheerfully inconsistent — the same word can mean a tool, a technique and a grade of hide depending on who is talking. This glossary standardises on how US suppliers and tanneries use the terms today, cross-checked against Tandy, the Leather Working Group and Horween. Skim it once now, then let the links pull you into the full guides as each term becomes relevant.
Tannages & leather grades
- Vegetable-tanned (veg-tan)
- Hide tanned with plant tannins (oak, chestnut, mimosa bark). Firm, carvable, ages to a patina — and the only leather that can be wet-molded, stamped and tooled. The default beginner leather; see buying veg-tan.
- Chrome-tanned
- Hide tanned with chromium(III) salts — the process behind most of the world’s leather. Soft, supple, uniform, colourfast; does not tool or burnish. Full comparison: veg-tan vs chrome-tan.
- Chrome-free / metal-free
- Industry definitions from the Leather Working Group: chrome-free means total chromium ≤ 0.1% of dry weight; metal-free means all tanning metals together stay under that line (aldehyde/“wet white” or pure veg tannages qualify).
- Full grain
- Leather that keeps its entire natural grain surface — only the hair removed, nothing sanded. The strongest, longest-wearing grade. See full grain vs top grain.
- Top grain
- The grain layer with its very surface lightly sanded and refinished for uniformity. Slightly less character and durability than full grain; still real, structural leather.
- Genuine leather
- Literally “real leather, not synthetic” — but in retail practice the label usually sits on lower-grade split or heavily corrected leather. A marketing phrase, not a quality tier: types of leather explained.
- Bonded leather
- Shredded leather scrap mixed with adhesive and pressed into sheets — sometimes as little as ~20% actual leather. The particleboard of the leather world.
- Split / suede / nubuck
- Splitting a hide horizontally yields the grain layer on top and splits below. Suede is a split (or flesh side) napped to velvet; nubuck is grain-side leather lightly buffed, so the nap is finer and stronger.
Half this glossary in one picture
Full grain, top grain, splits and suede are all cuts and treatments of the same hide cross-section.
Named leathers you will meet
- Bridle leather
- Firm veg-tan strap leather hot-stuffed with tallows and waxes on both sides, then slicked smooth — the classic English belt and tack leather. Dense, weather-resistant, and it blooms.
- Bloom
- The whitish waxy film that migrates to the surface of heavily stuffed leathers (bridle especially) over time. Not mould — a sign of honest wax content. Buffs straight off to a shine.
- Latigo
- Combination-tanned cowhide (chrome first, then veg re-tan, usually oil-stuffed). Strong, flexible and water-tolerant — the strap leather of tack rooms and dog gear.
- Pull-up leather
- Leather finished with oils and waxes that lightens where it is stretched or bent — the “crazy horse” effect. The colour shift is the feature, not a defect.
The hide itself
- Grain side / flesh side
- Grain is the smooth outer (hair) side with pores and character marks; flesh is the fibrous inner face. Most work shows grain out and hides or finishes the flesh.
- Side, shoulder, bend, belly
- The named cuts of a hide, each with its own firmness and price: a side is half a hide; the shoulder is the beginner’s all-rounder; the bend is the dense strap zone; the belly is stretchy practice material. Map and buying advice: hide cuts explained.
- Ounce (oz)
- Leather thickness, not weight: 1 oz = 1/64 in ≈ 0.4 mm, always quoted as a range (“4–5 oz”). Convert instantly with the thickness converter; project guidance in what weight for every project.
Techniques
- Casing
- Adding controlled moisture to veg-tan until it is damp through — the state in which it accepts stamping, carving and forming. Ready when the surface returns near natural colour and feels cool.
- Tooling
- Decorating cased veg-tan by striking stamps with a mallet or maul and carving with a swivel knife. Only veg-tan takes it.
- Skiving
- Thinning leather locally with a blade — at folds, seams and overlaps — so construction stays crisp without losing area. Technique: how to skive.
- Burnishing / slicking
- Compressing and polishing a cut edge by friction (water, gum tragacanth or Tokonole plus a slicker) until dense and glossy. The signature of hand-finished veg-tan: how to burnish.
- Edge beveling
- Shaving the sharp 90° corners off a cut edge with an edge beveler so the edge rounds cleanly under burnishing or paint.
- Wet molding
- Soaking veg-tan and drying it over a form so it hardens into the shape — holsters, sheaths, trays. Full walkthrough: how to wet mold.
Stitching
- Saddle stitch
- The hand seam: two needles on one thread crossing through every hole in opposite directions, each stitch locked independently — cut one and the seam holds. Stronger than a machine lockstitch: how to saddle stitch.
- Back stitch
- Sewing back through the last two or three holes at a seam’s end to lock the thread before trimming. The saddle stitch’s handshake.
- Pricking iron
- A multi-tooth tool that marks stitch spacing and angle; each hole is then opened with a diamond awl while sewing. The traditional, finer route.
- Stitching chisel
- The pricking iron’s punch-through cousin: longer teeth that make finished holes, no awl needed. The beginner’s friend — compared head-to-head in irons vs chisels.
- Pitch / SPI
- Stitch spacing: pitch is millimetres between holes, SPI is stitches per inch, and SPI = 25.4 ÷ pitch. The one number that coordinates irons, thread and look — play with it in the stitch pitch converter.
Key takeaways
- Tannage (veg vs chrome) decides what techniques are even possible.
- Grades run full grain → top grain → split/“genuine” → bonded.
- Most technique words — casing, tooling, molding, burnishing — apply to veg-tan only.
- Pitch and SPI are the same fact in two units: SPI = 25.4 ÷ pitch.
Keep building your bench skills: the next stop in this series is stitch pitch converter & thread matcher, and the step before it was leather project calculator.
Frequently asked questions
What is the difference between full grain and genuine leather?
Full grain is the top grade — the hide’s natural surface intact. “Genuine leather” merely means “not synthetic” and in practice usually labels split or corrected leather several tiers down. They describe different axes: one is a grade, the other is barely a claim.
Is suede real leather?
Yes — suede is real leather (typically a split, or the flesh side) finished to a velvet nap. It trades the grain layer’s strength and weather resistance for softness and texture.
What does casing leather mean?
Bringing veg-tan to an even, controlled dampness so it accepts tooling, stamping and forming. Cased right, the surface has returned near its natural colour and feels cool — damp through, never soggy.
Why is it called a saddle stitch?
It is the saddler’s seam — developed where a failed stitch could mean a thrown rider. Two needles cross in every hole so each stitch locks independently; even with one thread worn through, the seam holds.
What is bloom on leather?
A pale waxy film that surfaces on heavily hot-stuffed leathers like English bridle as waxes migrate. It looks alarming and means quality — buff it off with a cloth and it shines.