Toprecision — Precision Fastening & Connection Solutions

A fastener RFQ is judged before any metal is cut: if the drawing is ambiguous, quotes diverge and first deliveries surprise. Six callouts remove the ambiguity.

Bottom line: for most Precision Screws applications the decision comes down to load, environment and assembly method — the Precision Screws guide walks through the selection.

The six

1. Full thread designation: nominal × pitch × length × thread class (e.g. M4×0.7×16–6g). "M4×16" leaves the class to guesswork.
2. Head standard with revision: "per DIN 912:2008" — not just "DIN 912."
3. Property class or alloy+temper: 10.9, or 7075-T6, not "high strength."
4. Finish with salt-spray hours: "Zn-Ni 480 h NSS" beats "corrosion resistant."
5. Drive and secondary features: hexalobular size (T15), anti-rotation flats, captive shoulder geometry.
6. Critical tolerances flagged: coaxiality of head to shank, perpendicularity of bearing face — the tolerances that separate precision screws from catalog parts.

Attach function, not just form

A one-line service description ("cycles 500+ times, 105 °C, aluminum parent") lets suppliers propose better solutions — locking features, inserts, materials — before quoting. Topprecision's engineering team reviews every RFQ drawing and responds with callout clarifications in the quote itself, so the first article matches the intent, not just the text.

Industry fastening requirements

Need fasteners for EV battery packs?

Toprecision manufactures aluminum 6061/ZT68 bolts, LC-coated battery connectors and liquid-cooling quick-connect fittings for EV battery packs. Send the pack voltage and torque spec — we will supply the insulation rating and thermal cycling test data. Request EV fastening support.