EDC Pocket Knife Geometry: The 20-Degree Default

An EDC blade leads the hardest life in the knife world: cardboard by the mile, plastic strapping, food at lunch, a staple it never saw coming — owned by someone who sharpens twice a year. Its geometry is a compromise engineered for abuse by neglect, and the conventions here are conventions because they survive.

The Default: 15–20 Per Side

Twenty degrees per side is the factory default of the entire folder industry, and it earned the job: keen enough to slice, obtuse enough to shrug off staples and pry-ish moments. Makers using good steel — MagnaCut, S35VN, or 14C28N run hard — can drop to 15–17 dps and hand the owner noticeably better cutting with no complaints. Below 15, warranty life gets interesting.

Hollow vs Flat in the Pocket

Both rule segments of the market. Full flat gives the cleanest push cuts and easy thin-behind-the-edge grinding on a 2×72 platen. Hollow (ground on the wheel) keeps the blade slicey through many sharpenings because the concave cheeks stay thin as the edge retreats — the reason it owns hard-use folder brands. Sabre grinds add mid-blade stiffness for pointy tactical patterns. See Blade Grind Types for grinding each.

Behind the Edge

EDC behind-edge thickness: 0.015–0.025 inch measured a quarter inch up. Under 0.015 cuts beautifully and chips at staples; over 0.025 wedges in cardboard and feels dull sharp. This one caliper measurement predicts an EDC blade’s personality better than the edge angle does.

Tips That Survive Pockets

Drop points dominate EDC for a reason: the lowered, supported tip drills and resists snapping. Wharncliffes and sheepsfoot patterns trade the belly for box-cutter control and a tip that opens clamshell packaging without stabbing the contents. Fine trailing points and needle clip points belong on hunting blades, not in pockets full of keys.

The Sharpening-Reality Check

Design the edge for its maintenance schedule. An owner with stones deserves 15 dps; an owner with a pull-through sharpener (be honest, many are) is better served at 20 dps with a microbevel that any abuse re-forms instead of chips. A microbevel is the maker’s insurance policy on every EDC edge — cheap to apply, invisible to the owner, and it turns edge failure into edge wear.