Keycap Specs: Profiles, PBT Thickness and Stem Fit

Mechanical Keyboard Keycap Profiles, PBT Plastic Wall Thickness & Stem Compatibility

Keycap Specs
Independent · 2026

Minimal pink 3D render of a stacked square keycap base with a round ringed stem socket on top and a tall translucent pink panel showing height behind it

compatibility

MX Keycap Dimensions: Footprint, Stem Socket and Height

MX keycap dimensions in mm: about 18 mm base on a 19.05 mm grid, a 4.1 mm cross socket with 1.17 mm arms, and profile heights from 7.4 to 16.5 mm.

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Latest guides

Pastel pink isometric render of a round pink keycap-shaped cylinder on a white platform with a lavender panel, a port and a translucent plastic sheet.

materials

PBT vs ABS Keycaps Explained: Which Plastic to Buy

PBT resists shine, UV yellowing and solvents; ABS takes double-shot legends best and polishes with use. Which…

profiles

Keycap Row Codes and Profile Heights: What Is Documented

Decode keycap row codes across vendors, distinguish profile heights from installed height, and check what pub…

Blank cream keyboard with a blue spacebar beside a tray of spare keycaps, above a row of loose caps graded by width and one flipped to show its stem

compatibility

Keycap Sizes Chart: 1u, Space Bar and Kit Dimensions in mm

Keycap sizes in mm, cm and units: a 1u cap is about 18 mm on a 19.05 mm grid, a 6.25u space bar is 118 mm, pl…

Cream mechanical keyboard with a blue keycap lifted off exposed switches, beside loose keycaps showing cross stems, a stabilizer wire, and a keycap puller

troubleshooting

How to Fix Keycap Wobble and Loose Keycaps

Diagnose and fix a loose or wobbling keycap by checking the cap socket, switch stem, plate seating and stabil…

A blue keycap and a white keycap tilted to show their hollow undersides and stems, with a steel caliper gauging the white cap's wall thickness.

materials

Keycap Wall Thickness by Material: PBT and ABS in mm

Compare published PBT and ABS keycap thickness in millimetres, separate wall dimensions from legend methods, …

Interactive tool

Keycap Profile & Row Code Calculator

Quoted profile heights, north- or south-facing LED clearance, and the vendor row code your chosen row is sold under. Free, no signup, runs in your browser.

Keycap Specs — Mechanical Keyboard Keycap Profiles, PBT Plastic Wall Thickness & Stem Compatibility