Overview
ISO 10512:2012 specifies the characteristics of prevailing torque type hexagon regular nuts (with non‑metallic insert) having metric fine pitch threads. The standard covers nominal thread diameters D from 8 mm up to and including 36 mm, and defines product grades and property classes for these locknuts. It is intended to ensure consistent dimensions, mechanical properties and fit for prevailing‑torque hexagon nuts used in assemblies that require vibration‑resistant locking.
Key topics and requirements
- Scope and sizes: Applicable to nominal diameters D = 8 mm to 36 mm. Product grade A applies for D ≤ 16 mm; grade B for D > 16 mm.
- Property classes: Defines mechanical/property classes 6, 8 and 10 (note: property class 10 is not specified for D > 16 mm).
- Threading and tolerances: Uses metric fine‑pitch threads; tolerance class 6H for internal threads. Related thread standards (ISO 261/724/965‑2) apply for basic dimensions and limits.
- Materials and inserts: Nut body - typically steel; insert - for example polyamide (non‑metallic).
- Dimensions and prevailing torque feature: Nut dimensions correspond to ISO 8673 plus the prevailing‑torque element (shape at manufacturer’s discretion). Tabled dimensional data and figures are provided in the standard.
- Performance and testing: Mechanical and performance properties referenced to ISO 898‑2 and ISO 2320. Acceptance inspection and surface discontinuity limits reference ISO 3269 and ISO 6157‑2.
- Coatings and finishes: Electroplating per ISO 4042; zinc‑flake coatings per ISO 10683; additional finishes to be agreed between supplier and purchaser.
- Design designation: Example - Prevailing torque type hexagon regular nut ISO 10512 - M12 × 1,5 - 8.
Applications and users
- Who uses ISO 10512:2012
- Fastener manufacturers specifying production tolerances for prevailing‑torque hex nuts.
- Design and mechanical engineers selecting vibration‑resistant locking nuts for machinery and vehicles.
- Purchasing and procurement teams ensuring supplied nuts meet international specification.
- Quality control and inspection personnel performing acceptance checks and verifying finishes.
- Typical applications
- Automotive assemblies, transport equipment, industrial machinery and any application requiring fine‑pitch metric fastenings with reliable prevailing torque locking.
Related standards
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