Data Changelog
Every correction to a published value is logged here, alongside dataset additions. Values never change silently — a corrected dimension gets an entry saying what changed and why.
| Date | Kind | Change |
|---|---|---|
| 2026-08-12 | added | Wire gauge (AWG) and sheet-metal gauge verticals 44 AWG sizes (ASTM B258, validated against the defining formula) and 28 sheet gauges in four materials (MSG steel, galvanized, stainless, aluminum), with reverse lookup. |
| 2026-08-12 | added | Screw drives & head styles Drive recess glossary, Torx T1–T60 (ISO 10664), Phillips/Pozidriv and Robertson driver charts, head profiles with the 82°/90° countersink distinction. |
| 2026-08-12 | added | Deep-groove bearings vertical 74 bearings (ISO 15 boundary dimensions, 6800/6900/6000/6200/6300 + miniatures) with reverse bore × OD × width identification and designation decoding. |
| 2026-08-11 | added | Pipe/NPT and AS568 O-ring verticals 18 NPS sizes with schedules and NPT tap drills (ASME B36.10M / B1.20.1); all 349 AS568 O-ring sizes with reverse lookup. |
| 2026-08-11 | corrected | AS568-456 inside diameter (caught before publication) The first transcription source listed a wrong ID for dash -456; the series-step validation flagged it and the value was corrected against a second source (13.475″) before the O-ring pages went live. |
| 2026-08-11 | added | Initial launch 309 drill sizes, 65 thread standards with tap drills and clearance holes, fastener dimensions, universal search, compare tool, printable charts. |