Specification summary of ISO 10664 as applied to torx keys (l-key and t-handle): the dimensions the standard fixes, the full size range supplied, and the related designations commonly cross-referenced.
ISO 10664 — Scope
The table below lists the dimensions catalogued for torx keys (l-key and t-handle) under ISO 10664. The scope of ISO 10664 itself is not summarised here — where a figure matters, confirm it against the published document.
Tolerance & Product Grades
Product grade is a concept from dimensional fastener standards and does not apply to ISO 10664. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by ISO 10664
| Torx size | Typical mating screw | Form | Notes |
|---|---|---|---|
| T6 | M2 hexalobular screw | L-key | electronics and instrument assembly |
| T8 | M2.5 hexalobular screw | L-key | electronics and instrument assembly |
| T10 | M3 hexalobular screw | L-key or T-handle | general light assembly |
| T15 | M3.5 hexalobular screw | L-key or T-handle | general light assembly |
| T20 | M4 hexalobular screw | L-key or T-handle | general assembly |
| T25 | M5 hexalobular screw | L-key or T-handle | general assembly, decking screws |
| T27 | M5 / M6 hexalobular screw | L-key or T-handle | construction screws |
| T30 | M6 hexalobular screw | L-key or T-handle | construction and structural screws |
| T40 | M8 hexalobular screw | L-key or T-handle | heavy assembly |
| T45 | M10 hexalobular screw | L-key | heavy assembly |
| T50 | M12 hexalobular screw | L-key | heavy assembly |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Torx Keys (L-Key and T-Handle) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
Companion Standards
A complete specification for torx keys (l-key and t-handle) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. ISO 10664 is one of them, not all of them.
Custom manufacturing · Made to drawing
Need a fastener tool to this standard in a non-standard size?
Parts built to ISO 10664 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
