DIN 7984 covers the dimensional requirements for low head socket cap screws. Reproduced below: the complete size table, and the companion and equivalent standards referenced when ordering to this document.
DIN 7984 — Scope
DIN 7984 is "Hexagon socket head cap screws with low head".
Material, property class, surface finish and packaging are governed by separate documents — ISO 898-1 and ISO 898-2 for mechanical property classes, ISO 4042 for electroplated finishes.
Tolerance & Product Grades
DIN 7984 does not divide low head socket cap screws into product grades. Tolerances are given as limits on the individual dimensions in the table.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by DIN 7984
| Size | Pitch P (mm) | b (mm) | Head diameter dk (mm) | da (mm) | ds_min (mm) | e (mm) | Head height k (mm) | r (mm) | Hex socket s (mm) | t (mm) | v (mm) | dw (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 12 | 5.5 | 3.6 | 2.86 | 2.3 | 2.0 | 0.1 | 2.0 | 1.5 | 0.3 | 4.84 | 5~20 | DIN 7984 |
| M4 | 0.7 | 14 | 7.0 | 4.7 | 3.82 | 2.87 | 2.8 | 0.2 | 2.5 | 2.3 | 0.4 | 6.2 | 6~25 | DIN 7984 |
| M5 | 0.8 | 16 | 8.5 | 5.7 | 4.82 | 3.44 | 3.5 | 0.2 | 3.0 | 2.7 | 0.5 | 7.7 | 8~30 | DIN 7984 |
| M6 | 1.0 | 18 | 10.0 | 6.8 | 5.82 | 4.58 | 4.0 | 0.25 | 4.0 | 3.0 | 0.6 | 9.2 | 10~40 | DIN 7984 |
| M8 | 1.25 | 22 | 13.0 | 9.2 | 7.7 | 5.72 | 5.0 | 0.4 | 5.0 | 3.8 | 0.8 | 12.03 | 12~60 | DIN 7984 |
| M10 | 1.5 | 26 | 16.0 | 11.2 | 9.78 | 8.01 | 6.0 | 0.4 | 7.0 | 4.5 | 1.0 | 15.03 | 16~70 | DIN 7984 |
| M12 | 1.75 | 30 | 18.0 | 13.7 | 11.73 | 9.15 | 7.0 | 0.6 | 8.0 | 5.0 | 1.2 | 17.03 | 20~80 | DIN 7984 |
| (M14) | 2.0 | 34 | 21.0 | 15.7 | 13.73 | 11.43 | 8.0 | 0.6 | 10.0 | 5.3 | 1.4 | 19.83 | 30~80 | DIN 7984 |
| M16 | 2.0 | 38 | 24.0 | 17.7 | 15.73 | 13.72 | 9.0 | 0.6 | 12.0 | 5.5 | 1.6 | 22.83 | 30~80 | DIN 7984 |
| (M18) | 2.5 | 42 | 27.0 | 20.2 | 17.73 | 13.72 | 10.0 | 0.6 | 12.0 | 6.5 | 1.8 | 25.83 | 40~100 | DIN 7984 |
| M20 | 2.5 | 46 | 30.0 | 22.4 | 19.67 | 16.0 | 11.0 | 0.8 | 14.0 | 7.5 | 2.0 | 28.83 | 40~100 | DIN 7984 |
| (M22) | 2.5 | 50 | 33.0 | 24.4 | 21.67 | 16.0 | 12.0 | 0.8 | 14.0 | 8.0 | 2.2 | 31.61 | 50~100 | DIN 7984 |
| M24 | 3.0 | 54 | 36.0 | 26.4 | 23.67 | 19.44 | 13.0 | 0.8 | 17.0 | 8.0 | 2.4 | 34.61 | 50~100 | DIN 7984 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Low Head Socket Cap Screws page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify DIN 7984
DIN 7984 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 screw to this standard in a non-standard size?
Parts built to DIN 7984 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 warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
