Search standards
Check metric, UNC, UNF, UNEF, W, R/Rc/Rp/G and NPT by series and nominal size.
FASTENER REFERENCE
Find the thread data you need,
quickly and clearly.
Metric, unified inch and pipe threads, bolt-head dimensions and tap-drill references in one practical engineering app.
WHAT IT DOES
One place for everyday checks.
Move from search to comparison, tap drills and head dimensions without switching tables.
Bolt dimensions
Hex, socket head, low head, button, countersunk, pan and set-screw diagrams.
Applications & comparison
Review application conditions and compare two threads or two bolts, including strength classes.
STANDARDS
Structured around public standards.
Reference coverage is organised around JIS, ISO, ASME and DIN systems. Always verify the current official standard for design and inspection.
No account or behavioural tracking.The free and referral-code editions show non-personalized Google AdMob banners outside the Calculator. The one-time purchase removes banners. Favorites, history and preferences remain on the device.