Overview
ISO 13596:2000 - "Aerospace - Inserts, self-locking, with MJ threads, closed type, in metallic material, coated or uncoated - Dimensions" - defines the geometric requirements for closed, self‑locking metallic inserts with MJ threads intended for use in honeycomb and composite aerospace structures. The standard specifies configuration, dimensional tolerances (in millimetres) and features such as potting/vent holes and optional anti‑rotation provisions. It is intended solely for the compilation of aerospace product standards and does not assign strength or temperature classifications (these depend on core material and potting compound).
Key topics and requirements
- Scope and use: Applies to closed-type, self‑locking inserts with MJ threads in metallic material, coated or uncoated, installed in honeycomb and composite panels.
- Dimensions and tolerances: All dimensions and tolerances are given in millimetres and apply to inserts after any surface coating(s). Detailed geometry is provided in the standard’s figures and tables.
- Threading: Uses MJ thread codes (e.g., MJ3–MJ6) in accordance with MJ thread definitions; thread limit dimensions for mating bolts/nuts are referenced from ISO 5855-2.
- Functional features:
- Shank deformation area to provide the self‑locking action.
- Potting and vent hole(s) for installation in sandwich panels.
- Optional anti‑rotation feature on the shank or bottom flange (manufacturer’s option).
- Manufacturer discretion: Details of form not explicitly stated are left to the manufacturer, provided the dimensional requirements are met.
- Limitations: The standard does not specify strength or temperature classes - these depend on the combination of core material and potting compound and must be specified elsewhere.
Applications and users
- Typical applications:
- Fastening points in honeycomb and composite sandwich panels on aircraft and spacecraft.
- Attachment points for structural components, interiors, avionics equipment, and access panels where a flush/closed insert is required.
- Who uses this standard:
- Aerospace designers and structural engineers specifying inserts for composite/honeycomb assemblies.
- Fastener manufacturers and suppliers producing MJ-thread self‑locking inserts.
- Quality assurance, procurement, and certification teams ensuring dimensional conformity in aerospace product standards.
- Technical writers and standards committees compiling aerospace component specifications.
Related standards
- ISO 5855-2:1999 - Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts (normative reference used by ISO 13596).
- Use ISO 13596 in conjunction with material, potting compound and strength/temperature specifications relevant to the specific aerospace application.
Keywords: ISO 13596:2000, aerospace inserts, MJ threads, self‑locking inserts, honeycomb inserts, composite inserts, dimensions, aerospace fastener standards, potting compound.