Contact

Corrections especially welcome.

Reporting an error

Dimensions here are generated from a single data table rather than typed per page, so an error is rarely isolated — if one figure is wrong the same fault usually affects a whole series. Fixing it at the source fixes every page at once. Include the dash number, what looks wrong, and your source if you have one.

Requesting coverage

Metric ISO 3601 sizes, JIS sizes, quad rings and metric-to-AS568 cross-referencing are on the roadmap. Requests move things up it.

Commercial enquiries

Advertising is sold through automated exchanges, not directly. We don't accept paid guest posts, sponsored links or paid placement in the reference data, and we don't sell o-rings.