Overview
ISO 10511:2012 defines the characteristics of prevailing torque type hexagon thin nuts (with non‑metallic insert). It covers metric threads from M3 to M36, specifies product grades and property classes, and aligns nut dimensions with ISO 4035 while adding the prevailing‑torque feature. This International Standard is intended for use where a thin hexagon nut with an inserted, self‑locking (prevailing torque) function is required.
Key topics and requirements
- Thread range: M3 up to and including M36.
- Product grades: Grade A for threads up to and including M16; grade B for threads above M16.
- Property classes: 04 and 05.
- Dimensions: Correspond to ISO 4035 (hexagon thin nuts) with added prevailing torque feature; figure and table of dimensional limits are given in the standard.
- Materials: Nut body - steel; insert - e.g., polyamide (non‑metallic).
- Thread tolerance: Class 6H (referenced ISO 261, ISO 724, ISO 965‑2).
- Mechanical and performance references: ISO 898‑2 and ISO 2320 for mechanical/property and prevailing torque performance.
- Coating and finish: Electroplating per ISO 4042; non‑electrolytically applied zinc‑flake coatings per ISO 10683; additional finishes agreed between supplier and purchaser.
- Quality and inspection: Surface discontinuity limits (ISO 6157‑2) and acceptance inspection (ISO 3269).
- Designation example: Prevailing torque type hexagon thin nut ISO 10511 - M12 - 04
Applications and who uses this standard
ISO 10511 is used by:
- Fastener manufacturers producing metric prevailing‑torque thin hex nuts with non‑metallic inserts.
- Design and mechanical engineers specifying self‑locking nuts in assemblies where a low‑profile (thin) nut is required.
- Procurement and quality assurance teams for specifying acceptance, coatings, and product grades.
- Test labs and inspectors performing acceptance inspection and verifying conformity to dimensional, material and performance requirements.
Typical practical applications include assemblies requiring a locking thin nut for vibrational resistance or where space constraints favor a low‑profile hexagon nut with self‑locking capability.
Related standards
Relevant referenced standards include:
Keywords: ISO 10511, prevailing torque, hexagon thin nuts, non‑metallic insert, metric threads M3–M36, property class 04, product grade A/B, fastener standards.
