DIN 371 is the standard cited for machine taps (din 371 / din 376). This page sets out what the standard controls for this part, reproduces the dimensional table supplied against it, and notes the related designations referenced on drawings.
DIN 371 — Scope
The table below lists the dimensions catalogued for machine taps (din 371 / din 376) under DIN 371. The scope of DIN 371 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 DIN 371. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 371
| 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 |
Companion Standards
A complete specification for machine taps (din 371 / din 376) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. DIN 371 is one of them, not all of them.
When to Specify DIN 371
DIN 371 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.
Custom manufacturing · Made to drawing
Need a fastener tool to this standard in a non-standard size?
Parts built to DIN 371 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.
