The table below lists the dimensions catalogued for double-end studs (din 938 / 939 / 940) under DIN 938. The scope of DIN 938 itself is not summarised here — where a figure matters, confirm it against the published document.
DIN 938 — Scope
The table below lists the dimensions catalogued for double-end studs (din 938 / 939 / 940) under DIN 938. The scope of DIN 938 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 938. Tolerances for this part are the limits shown against each dimension in the table.
Dimensions Specified by DIN 938
| Thread size | Metal end bm (mm) | For parent material | Nut end (mm) | Common overall length (mm) | Property class | Reference standard | Sibling standard |
|---|---|---|---|---|---|---|---|
| M8 | 8 | Steel | 8 | 30~80 | 8.8 | DIN 938 | DIN 939 = 10 mm, DIN 940 = 16 mm |
| M10 | 10 | Steel | 10 | 35~100 | 8.8 | DIN 938 | DIN 939 = 12.5 mm, DIN 940 = 20 mm |
| M12 | 12 | Steel | 12 | 40~120 | 8.8 | DIN 938 | DIN 939 = 15 mm, DIN 940 = 24 mm |
| M16 | 16 | Steel | 16 | 50~160 | 8.8 | DIN 938 | DIN 939 = 20 mm, DIN 940 = 32 mm |
| M20 | 20 | Steel | 20 | 60~200 | 8.8 | DIN 938 | DIN 939 = 25 mm, DIN 940 = 40 mm |
| M24 | 24 | Steel | 24 | 70~240 | 8.8 | DIN 938 | DIN 939 = 30 mm, DIN 940 = 48 mm |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Double-End Studs (DIN 938 / 939 / 940) 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 double-end studs (din 938 / 939 / 940) normally cites several documents: one for the geometry, one for the material or mechanical properties, and one for the finish. DIN 938 is one of them, not all of them.
Custom manufacturing · Made to drawing
Need a bolt to this standard in a non-standard size?
Parts built to DIN 938 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. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
