How to Read a Knife Spec Sheet: Blade Length, Thickness, Weight and Steel

A product page gives you a wall of numbers — 3.25 inches, 0.118 inches, 59 ± 1 HRC, 112.5 g, "Top Liner Lock" — and expects you to turn that into a buying decision. Most buyers skim for price and blade length and ignore the rest. That is a mistake, because three or four of those numbers predict how a knife will actually feel in your pocket far better than the marketing copy does.

This is a working guide to reading an EDC knife spec sheet: which numbers are comparable across brands, which ones are measured inconsistently, and which ones tell you almost nothing on their own. Every example below comes from published specs on models in our catalog, so you can check the numbers yourself.

Blade length: the number everyone reads, and the one most often misunderstood

Blade length is usually the first spec listed and the first one people compare. It is also measured in more than one way.

The American Knife & Tool Institute publishes a measurement protocol: the shortest straight line from the blade tip to the forward-most point of the handle or hilt, rounded down to the nearest eighth of an inch. That is the standard used when a length limit has to be applied. Most manufacturers measure tip-to-handle in a straight line as well, which is why a listed 3.25 inches usually means the blade itself, not the sharpened portion.

The difference matters on knives with a finger choil or an unsharpened ricasso. A blade with a deep choil can measure 3.25 inches overall while only 2.9 inches of it is actually sharpened. If you are comparing two knives on usable edge, a listed length can be off by a quarter inch without anyone lying. The AKTI's explanation of how blade length is measured, including the choil problem, is worth reading once — it is the clearest short treatment of the subject.

Our own blade length and carry rules guide covers the practical implications if you travel with a knife, but the measurement lesson applies to shopping too: compare sharpened edge, not just the headline number, when the knife has a choil.

Blade thickness: the spec that predicts how a knife cuts

Blade stock thickness is listed in inches or millimetres and is one of the most useful numbers on the page, because it drives both cutting geometry and weight.

Real examples from the catalog:

• CIVIVI Baby Banter — 2.34" blade, 0.09" (2.3 mm) stock
• Kizer Klipper — 3.15" blade, 0.11" (2.8 mm) stock
• CJRB Bowie Pyrite — 3.15" blade, 0.11" (2.7 mm) stock
• Vosteed Corgi V — 2.36" blade, 0.118" (3.0 mm) stock
• Vosteed Raccoon 2.0 — 3.25" blade, 0.118" (3.0 mm) stock
• CIVIVI Elementum — 2.97" blade, 0.12" (3.0 mm) stock
• Artisan Cutlery Tomahawk — 3.14" blade, 0.16" (3.98 mm) stock
• WE Knife Sine Wave — 3.98" blade, 0.16" (4 mm) stock

A 0.09" blade behind a 15° edge behaves completely differently from a 0.16" blade behind the same angle. Thin stock slices better and weighs less; thick stock resists lateral loads and feels more substantial, but it wedges in dense material unless the grind compensates. Our blade thickness explainer goes deeper into where the 0.10–0.13" range makes sense and where 0.16" starts to cost you cutting performance.

One caution: the field is sometimes recorded in millimetres and sometimes in inches, and listings occasionally mix the two. If a spec sheet says "0.118 in / 3.00 mm," that is consistent. If it says "blade thickness 74.64," something has gone wrong in the feed — treat the number as missing rather than as a 74 mm blade.

Grind: short label, big consequence

Spec sheets list the grind as flat, hollow, saber, or chisel. This single word tells you more about how the knife will cut than the steel name does.

• Flat grind — the most common on modern folders. A continuous taper from spine to edge, good all-round behaviour, and predictable sharpening.
• Hollow grind — concave, thin behind the edge, excellent on slicing tasks, weaker behind the edge than flat. The CIVIVI Elementum is a good example of a hollow grind on a small EDC blade.
• Saber grind — a flat or hollow primary bevel that stops partway up the blade, leaving a thick spine. Durable, less efficient at slicing.

The full comparison — including how each grind behaves when dull and how it sharpens — is in our blade grinds guide. For spec-sheet purposes, the rule is simple: two knives with the same blade length, stock thickness, and steel will still cut differently if one is hollow ground and the other is sabre ground. Never compare on steel alone.

Steel name and hardness range: read both, trust neither blindly

Steel designations are not standardized in the way buyers assume. "Nitro-V" from one maker and "Nitro-V" from another are the same alloy but not necessarily the same heat treatment. "Damascus" is a pattern, not a grade, and can describe anything from a $60 import to a $400 hand-forged blade.

Hardness is the number that follows the steel name, and it is always a range:

• Nitro-V at 58–60 HRC (Baby Banter) versus 59–61 HRC (Elementum)
• 14C28N at 59 ± 1 HRC (Raccoon 2.0) and 60 ± 1 HRC (Corgi V)
• AR-RPM9 at 59–61 HRC (CJRB Bowie Pyrite)
• Bohler M390 at 59–61 HRC (WE Knife Sine Wave)
• Damascus at 60–62 HRC (Artisan Cutlery Tomahawk)

Two things follow. First, the range is a tolerance, not a promise — a knife at the bottom of a stated range will be tougher and dull faster than one at the top. Second, hardness should never be read alone. A 62 HRC blade in a steel with poor toughness chips; a 58 HRC blade in a steel with high wear resistance still holds an edge well. Our HRC explainer covers what the Rockwell scale actually measures and why the same number means different things in different alloys.

If you want the one external reference worth bookmarking for edge-retention claims, it is the CATRA testing of 48 knife steels from Knife Steel Nerds — it is the closest thing the hobby has to comparable data across alloys, measured with consistent geometry.

Weight: the number that decides whether you actually carry it

Weight is listed in grams, ounces, or both, and it is the spec most likely to be measured inconsistently. Some makers include the pocket clip, some do not; fixed blades may or may not include the sheath. Even with that caveat, weight is the best proxy for how a knife will feel after eight hours in a pocket.

A comparison that makes the point better than any explanation:

Read the first two rows together. The Baby Banter and Corgi V are within two hundredths of an inch of each other in blade length, yet they weigh 19 g apart. The difference is not the blade — it is 0.7 mm of stock and an aluminium handle versus G10. Then look at the last row: the C01C has a blade barely longer than the Raccoon's and weighs exactly double, because brass is dense. Handle material can move weight more than blade length does, which is why our weight versus size guide treats the two as separate variables.

The practical thresholds most people settle on: under 60 g disappears in a pocket, 70–100 g is the comfortable daily band, 110–140 g is noticeable but fine in jeans, and anything over 200 g is a knife you carry because you want to, not because you forget about it.

Lock names: proprietary labels hide familiar mechanisms

Spec sheets increasingly list locks by brand name rather than mechanism: Top Liner Lock, Nested Liner Lock, Vanchor Lock, Clutch Lock, Recoil Lock V2, Crossbar Lock, Button Lock. Behind those names there are really only a few mechanisms:

• Liner lock and frame lock — a spring bar or frame section engages the blade tang. Simple, proven, one-hand close with practice.
• Button lock — a plunger through the scale disengages the lock. Easy one-hand operation, popular on budget and mid-range folders.
• Crossbar-style locks — a sliding bar engages a notch in the tang. Ambidextrous, strong, and the basis for most "axis-style" designs.
• Top liner lock and similar variants — a liner lock accessed from the spine side of the handle.
• Slip joint — no lock at all; spring tension holds the blade open.

When a spec sheet says "Vanchor Lock," it is telling you which family the mechanism belongs to, not how strong it is. Our lock strength comparison covers how these mechanisms compare in practice, and parts of a folding knife explains what each component does if the terminology is unfamiliar.

The numbers that define carry footprint

Two more specs are worth checking before you buy: overall length and closed length.

• Baby Banter: 5.46" open, 3.12" closed
• Corgi V: 5.85" open, 3.48" closed
• Elementum: 7.00" open, 4.03" closed
• Raccoon 2.0: 7.60" open, 4.35" closed
• WE Knife Sine Wave: 8.84" open, 4.86" closed

Closed length is what actually competes for pocket space; overall length tells you how much handle you get for your grip. A knife with a 4.86" closed length takes up roughly the same pocket real estate as a phone corner. Handle thickness — often listed as 0.41" to 0.52" — determines whether it prints.

What the spec sheet will not tell you

Four things that decide whether you keep a knife are almost never on the page:

1. Detent and action. Whether the blade snaps open cleanly, whether it drops shut, whether the lock releases without sticking. Numbers cannot describe this.
2. Ergonomics. Where the jimping sits, whether the choil fits your finger, how the handle fills your palm.
3. Edge angle out of the box. Rarely published, and it determines whether the knife cuts like its geometry suggests.
4. Build consistency. Whether the centering is right, screws are tight, and the grind is even — per-unit quality, not a spec.

That is why specs narrow the field but should not make the final call. Use them to reduce ten candidates to three, then rely on owner reports, reviews, and return policy for the rest.

A five-minute spec-sheet workflow

1. Filter by blade length band — 2.3–2.6" for office and compact carry, 2.9–3.3" for general EDC, 3.5"+ if you genuinely need reach.
2. Check stock thickness against your cutting tasks — 0.09–0.12" for slicing, 0.14–0.16" for harder use.
3. Note the grind, then the steel and its HRC range. If the steel is unfamiliar, check whether it is stainless before anything else.
4. Compare weight within the same blade-length band, not across bands.
5. Read the lock name as a mechanism family, then confirm it is ambidextrous if that matters to you.

Run those five steps and most of the catalog eliminates itself. The rest is preference — and preference is the part no spec sheet can solve for you.

Bottom line

The useful specs on an EDC knife page are blade length (with the choil caveat), stock thickness, grind, steel plus its HRC range, weight, and closed length. The misleading ones are "premium steel" claims without a hardness range, corrosion language on non-stainless alloys, and lock names that sound proprietary but describe ordinary mechanisms.

Read the numbers as constraints rather than features. A knife that fits your blade length band, has stock and grind suited to your cutting, weighs what you will tolerate, and runs a steel you can maintain is a good knife — regardless of what the marketing copy says about it.