For machine taps (din 371 / din 376), ISO 529 is the governing document for the dimensions listed below. Mechanical and performance requirements for this part family are set by its own standards, not by the bolt and screw property-class documents.
ISO 529 — Scope
The table below lists the dimensions catalogued for machine taps (din 371 / din 376) under ISO 529. The scope of ISO 529 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 529. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by ISO 529
| Tap form | Chip behaviour | Hole type | Suited to |
|---|---|---|---|
| spiral point (gun nose) | pushes chips ahead of the tap | through holes only | steel, stainless, general production |
| spiral flute | pulls chips back out of the hole | blind holes | steel, aluminium, blind tapping |
| straight flute | chips break and collect in the flute | short through or blind holes | cast iron, brass, hand and machine use |
| thread-forming (fluteless) | no chips at all | through or blind | aluminium, copper, mild steel, thin sections |
| DIN 371 shank | n/a | n/a | M1 to M10, short shank |
| DIN 376 shank | n/a | n/a | M10 to M30, long shank |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Machine Taps (DIN 371 / DIN 376) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify ISO 529
Choose ISO 529 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for machine taps (din 371 / din 376).
Custom manufacturing · Made to drawing
Need a fastener tool to this standard in a non-standard size?
Parts built to ISO 529 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.
