Fine-Thread Nylon Insert Hex Lock Nuts manufactured to ISO 10512 are dimensioned by the size table reproduced on this page. The standard fixes geometry and tolerances only; material and property class are assigned by separate documents, and surface finish by separate finish standards.
ISO 10512 — Scope
ISO 10512 is "Prevailing torque type hexagon regular nuts (with non-metallic insert) 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 10512 does not divide fine-thread nylon insert 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 10512
| 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_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 | 9.5 | 8.92 | 6.44 | 5.15 | 13 | 12.73 | ISO 10512 |
| M10x1 | 1 | 10.8 | 10 | 14.63 | 17.77 | 11.9 | 11.2 | 8.04 | 6.43 | 16 | 15.73 | ISO 10512 |
| M10x1.25 | 1.25 | 10.8 | 10 | 14.63 | 17.77 | 11.9 | 11.2 | 8.04 | 6.43 | 16 | 15.73 | ISO 10512 |
| M12x1.25 | 1.25 | 13 | 12 | 16.63 | 20.03 | 14.9 | 14.2 | 10.37 | 8.3 | 18 | 17.73 | ISO 10512 |
| M12x1.5 | 1.5 | 13 | 12 | 16.63 | 20.03 | 14.9 | 14.2 | 10.37 | 8.3 | 18 | 17.73 | ISO 10512 |
| (M14x1.5) | 1.5 | 15.1 | 14 | 19.64 | 23.36 | 17 | 15.9 | 12.1 | 9.68 | 21 | 20.67 | ISO 10512 |
| M16x1.5 | 1.5 | 17.3 | 16 | 22.49 | 26.75 | 19.1 | 17.8 | 14.1 | 11.28 | 24 | 23.67 | ISO 10512 |
| M20x1.5 | 1.5 | 21.6 | 20 | 27.7 | 32.95 | 22.8 | 20.7 | 16.9 | 13.52 | 30 | 29.16 | ISO 10512 |
| M24x2 | 2 | 25.9 | 24 | 33.25 | 39.55 | 27.1 | 25 | 20.2 | 16.16 | 36 | 35 | ISO 10512 |
| M30x2 | 2 | 32.4 | 30 | 42.75 | 50.85 | 32.6 | 30.1 | 24.3 | 19.44 | 46 | 45 | ISO 10512 |
| M36x2 | 2 | 38.9 | 36 | 51.11 | 60.79 | 38.9 | 36.4 | 29.4 | 23.52 | 55 | 53.8 | ISO 10512 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Fine-Thread Nylon Insert Hex Lock Nuts page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
Companion Standards
ISO 10512 controls only the geometry of fine-thread nylon insert 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).
Custom manufacturing · Made to drawing
Need a nut to this standard in a non-standard size?
Parts built to ISO 10512 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.
