For round split dies and die stocks, EN 22568 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.
EN 22568 — Scope
EN 22568 specifies the dimensional requirements for round split dies and die stocks.
Material, surface condition and any performance rating are set by separate documents specific to this part family — ISO 898-1 and ISO 898-2, which govern bolt and nut property classes, do not apply here.
Tolerance & Product Grades
Tolerances for round split dies and die stocks are given as limits on the individual dimensions in the table rather than as a fastener product grade.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by EN 22568
| Die outside diameter | Thread range typically held | Adjustment | Held in |
|---|---|---|---|
| 16 mm | M1 u2013 M2.5 | split, three-screw adjustment | 16 mm die stock |
| 20 mm | M3 u2013 M5 | split, three-screw adjustment | 20 mm die stock |
| 25 mm | M6 u2013 M8 | split, three-screw adjustment | 25 mm die stock |
| 30 mm | M9 u2013 M12 | split, three-screw adjustment | 30 mm die stock |
| 38 mm | M14 u2013 M20 | split, three-screw adjustment | 38 mm die stock |
| 45 mm | M22 u2013 M24 | split, three-screw adjustment | 45 mm die stock |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Round Split Dies and Die Stocks page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify EN 22568
Choose EN 22568 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for round split dies and die stocks.
