Fastener spec check.
Paste one order line per row, for example M20x80 HDG 10.9 DIN 931 qty 5000. Each line is read into size, product, standard, grade, finish and quantity, then checked against rules from the standards: hydrogen embrittlement on galvanized high-strength bolts, oversize nuts, nut class, mixed inch and metric, structural washers and galvanic contact.
Reviewed 11 Nov 2026 · Based on ISO 898-1, ISO 898-2, ISO 10684, ISO 10683, EN 14399, ASTM F3125, ASTM A193 / A194, ASTM A563, EN 10204; weights from nominal ISO dimensions · Report an error
Questions on this?
Questions buyers ask.
Can class 10.9 bolts be hot-dip galvanized?
With care. Hot-dip galvanizing raises the risk of hydrogen embrittlement in high-strength steel, so class 10.9 is normally galvanized only as complete structural sets made under controlled pickling (EN 14399, ISO 10684). Class 12.9 and ASTM A490 bolts are not hot-dip galvanized; a zinc flake coating to ISO 10683 is the usual alternative.
Why do hot-dip galvanized bolts need special nuts?
The zinc layer makes the bolt thread larger, so the nut is tapped oversize to fit it (ISO 10684 for metric, overtapped ASTM A563 or A194 nuts for inch). Bolts and nuts should come as one set.
What happens to lines the checker cannot read?
They are marked as unread. Where the AI fallback is switched on, it may fill in fields, but only values written in the line itself are kept and the line is labelled for you to check.
Send your drawing. We reply within one business day.
Specification, quantity and destination. PDF, DWG, DXF and STEP welcome.
Request a quote