EDC Pocket Knife Geometry: The 20-Degree Default
EDC geometry: 15-20 degrees per side (20 is the industry default; 15-17 with good hard steel), 0.015-0.025 inch behind the edge, drop point or wharncliffe tips that survive pockets, full flat for pure cutting or hollow for slice retention through years of sharpening. Add a microbevel as insurance.
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.
Common Mistakes
Grinding a customer knife thinner than the customer’s habits. Needle tips on blades that will pry staples. Behind-edge thickness never measured, only guessed. Skipping the microbevel on an edge headed for an unknown life.
Safety
Folder blades are small work near a fast belt – use a push stick or wooden clamp handle for tip work rather than bare fingertips behind a 2-inch blade. Detent and lock surfaces are not grinder jobs; one slip ruins the action.