ISO 10513 is the governing dimensional standard for fine-thread all-metal hex lock nuts. This page sets out the scope of the standard, reproduces the full size table it specifies, and lists the DIN/ISO/ASME cross-references commonly cited in datasheets and drawings.
ISO 10513 — Scope
ISO 10513 is "Prevailing torque type all-metal hexagon nuts with metric fine pitch thread".
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
ISO 10513 does not divide fine-thread all-metal hex lock nuts 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 ISO 10513
| Size | Pitch P (mm) | d_a_max (mm) | d_a_min (mm) | d_w_min (mm) | Width across corners e (mm) | h_max (mm) | h_min (mm) | m_w_min (mm) | Width across flats s (mm) | s_min (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1 | 8.75 | 8 | 11.63 | 14.38 | 8 | 7.14 | 5.15 | 13 | 12.73 | ISO 10513 |
| M10x1 | 1 | 10.8 | 10 | 14.63 | 17.77 | 10 | 8.94 | 6.43 | 16 | 15.73 | ISO 10513 |
| M10x1.25 | 1.25 | 10.8 | 10 | 14.63 | 17.77 | 10 | 8.94 | 6.43 | 16 | 15.73 | ISO 10513 |
| M12x1.25 | 1.25 | 13 | 12 | 16.63 | 20.03 | 13.3 | 11.57 | 8.3 | 18 | 17.73 | ISO 10513 |
| M12x1.5 | 1.5 | 13 | 12 | 16.63 | 20.03 | 13.3 | 11.57 | 8.3 | 18 | 17.73 | ISO 10513 |
| (M14x1.5) | 1.5 | 15.1 | 14 | 19.64 | 23.36 | 14.1 | 13.4 | 9.68 | 21 | 20.67 | ISO 10513 |
| M16x1.5 | 1.5 | 17.3 | 16 | 22.49 | 26.75 | 16.4 | 15.7 | 11.28 | 24 | 23.67 | ISO 10513 |
| M20x1.5 | 1.5 | 21.6 | 20 | 27.7 | 32.95 | 20.3 | 19 | 13.52 | 30 | 29.16 | ISO 10513 |
| M24x2 | 2 | 25.9 | 24 | 33.25 | 39.55 | 23.9 | 22.6 | 16.16 | 36 | 35 | ISO 10513 |
| M30x2 | 2 | 32.4 | 30 | 42.75 | 50.85 | 30 | 27.3 | 19.44 | 46 | 45 | ISO 10513 |
| M36x2 | 2 | 38.9 | 36 | 51.11 | 60.79 | 36 | 33.1 | 23.52 | 55 | 53.8 | ISO 10513 |
Companion Standards
ISO 10513 controls only the geometry of fine-thread all-metal hex lock nuts. The mechanical strength is set by ISO 898-1 (bolts, screws and studs) or ISO 898-2 (nuts); the surface finish is governed by separate finish standards such as ISO 4042 for electroplating. For corrosion testing, the relevant document is ISO 9227 (neutral salt spray).
When to Specify ISO 10513
Choose ISO 10513 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for fine-thread all-metal hex lock nuts.
Custom manufacturing · Made to drawing
Need a nut to this standard in a non-standard size?
Parts built to ISO 10513 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 tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
