What This Chart Covers
The Item Size Lookup tool cross-references 1537 real, standardized dimensions from 0 to 24 inches (0-609.6mm) across roughly 40 categories. Type a decimal size, a screw or drill designation, a gauge, a nail size, a pipe/tube size, a shoe size, or a caliber/cartridge name, and see everything else — across every category below — that lines up at that exact dimension.
Wire, Cable & Electrical
Four wire gauge standards (AWG, SWG, BWG, and IEC 60228), circular mil, sheet steel gauge, battery cell sizes, coax cable sizes, blade fuse sizes, light bulb base sizes, and wire terminal/lug stud hole sizes.
Pipe, Tube & Conduit
Pipe OD/ID by schedule (NPS Schedule 40/80 for steel, aluminum, PVC, and CPVC, up to NPS 24; CTS for PEX, CTS-pattern CPVC, and copper tube Types K/L/M, up to 6in), EMT/IMC/RMC electrical conduit, PVC sprinkler/irrigation pipe (SDR21), DWV drain pipe, flexible vinyl tubing, round/square mechanical tube stock (steel, aluminum, and plastic/acrylic), and HVAC round duct diameters.
Rope, Chain, Webbing & Rigging
Rope diameter/circumference, welded steel chain (wire diameter and link dimensions by grade), webbing width/thickness, buckle inner width, ratchet strap width, bungee/shock cord diameter and length, carabiner gate opening, S-hook length/wire diameter, tarp thickness/grommet spacing, hardware cloth/netting mesh size and wire diameter, and zip tie/hose clamp sizes.
Fasteners, Drilling & Machining
Nails (box/finish/casing/roofing), wood/sheet metal/cap screws, drill sizes (fractional, number, letter, and ISO metric up to 50mm) and their ISO metric equivalents, UNC/UNF and metric tap drill sizes, reamer pre-drill allowances, precision-ground metal (ASME B18.8.2/ISO 2338) and wood dowel pin/rod sizes, typical achievable manufacturing tolerances by process (casting, machining, EDM, additive manufacturing/3D printing, woodworking, CMM/sensing, and semiconductor fabrication), rivet/cotter pin/retaining ring diameters, hex nut width across flats, flat washer ID/OD, O-ring cross-sections (AS568), precision ball diameters (metal/ceramic/plastic stock sizes), standard ball bearing bore diameters, and precision/linear-motion shaft diameters.
Firearms & Ballistics
Gun bore, shotgun gauge, and full cartridge designations; US and international/NATO naval and army gun bores up to 18.1in (Japan’s Yamato-class, the real historical maximum); rifle scope objective lens/main tube diameters; rifle scope reticle/red dot subtension sizes (MOA and Mil); and scope turret adjustment click values (MOA and Mil per click).
Optics & Instruments
Camera lens filter threads, microscope objective/eyepiece standards, telescope eyepiece barrel sizes, binocular objective lens diameters, and US hat sizes.
Electronics & Semiconductor Manufacturing
Standard silicon wafer diameters (1in through 450mm), IC/component pin pitch (DIP through fine-pitch BGA), and PCB thickness/trace width capability tiers.
Filtration, Cleanrooms & the Microscopic Scale
ISO 14644-1 cleanroom reference particle sizes, HEPA/ULPA/MERV filter rating thresholds, airborne dust/pollen/mold/bacteria sizes, virus size range, motor oil/oleic acid molecule length, common filter media (RO/NF/UF/MF membranes, HEPA/N95, surgical masks, coffee filters, oil filters) by the largest particle each one passes, and the smallest things ever directly observed or measured — from a photographed hydrogen atom orbital down to the finest distance scale ever probed at a particle collider.
Construction Materials
Dimensional lumber actual sizes, plywood/drywall thickness, rebar diameter, spark plug thread sizes, and server rack unit (U) heights.
Medical
Hypodermic needle gauge/length, syringe barrel diameter, hand and machine sewing needle sizes, surgical suture diameter (USP), and catheter French gauge.
Apparel & Everyday Hardware
US men’s and women’s shoe size and width (Brannock-standard) plus UK and EU shoe sizes and UK shoe widths; zipper/snap fastener sizes; ring size/button ligne; watch case/band sizes; bottle/jar cork and opening ID/OD (wine, Champagne, beer, Mason jars, and Kilner jars); and padlock/door lock dimensions.
Paper, Tape & Vinyl
Paper caliper and standard sheet sizes (US and ISO 216), tape thickness/width/roll length, and vinyl thickness/roll width/roll length.
Sports, Hobbies & Reference Objects
US coin, credit card, optical disc, and sporting ball reference sizes; guitar string gauges; bicycle wheel/rim diameters; and bowling ball diameter/circumference plus standard preset thumb hole, finger hole, and hole span drilling sizes (XS through XXL).
Everyday Reference Points
Intuition anchors sourced from real studies and specs, not just a category of their own: human hair diameter, thumbnail thickness, rice grain size, grain of sand, a 16oz can, human eyeball diameter, pupil diameter, blood cell diameter, fingerprint ridge width, fingerprint residue film thickness on glass, and paper/paint coat/skin cell thickness.
Want to know exactly where a number came from? See the References & sourcing page, or email me directly.