Overview
ISO 6099:2018 - "Fluid power systems and components - Cylinders - Identification code for mounting dimensions and mounting types" establishes a uniform convention for identifying mounting dimensions, envelope dimensions, accessory and connector dimensions, and mounting/accessory types for fluid power cylinders (hydraulic and pneumatic). The standard provides an identification code system and reference-point rules so designers, manufacturers and specifiers can describe cylinder mounting and rod-end geometry consistently.
Key topics
- Identification codes for rod end types
- Defines reference points (theoretical reference point - TRP) and letter codes for rod ends such as plain, pin, male/female threaded, grooved, and wrench-flat types (examples: RTM, RTF, RPE, RPR, RFE, RFS).
- Letter-code system for dimensions
- Rules for two-letter codes that identify envelope and longitudinal dimensions (letters beginning with U, Z, W, X, Y). Special signs (+, ++, +/) indicate adding stroke, twice the stroke, or half the stroke.
- Mounting-type identification
- Two- or three-letter plus number codes that identify mounting forms (examples: MB1 body-through-bolt, MF1 flange type, MP clevis types, MT trunnion types). Supports double-rod variants and envelope variations.
- Accessory identification and port position
- Codes and conventions for accessory types and designation of port positions for round and square cylinders.
- Scope limits
- The document creates a coding convention and uniform language; it is not a definitive list of every possible mounting/accessory type nor a dimensional interchangeability specification.
Applications
- Standardizes technical documentation, drawings and CAD libraries for fluid power cylinders.
- Facilitates clear procurement specifications and vendor quotations by using unambiguous mounting and rod-end codes.
- Speeds design reviews and integration of cylinders into machine assemblies by providing consistent reference points and dimensioning rules.
- Useful in technical catalogs, BOMs, maintenance manuals and interchangeability studies where consistent naming of mounting types and dimensions matters.
Who uses this standard
- Cylinder designers and OEM machine designers
- Pneumatics/hydraulics component manufacturers and suppliers
- Technical authors, CAD librarians and procurement/specification engineers
- Maintenance engineers and systems integrators
Related standards
- ISO 5598 (Fluid power systems and components - Vocabulary) - referenced for terminology.
- ISO 6099:2018 replaces the 2009 edition and was prepared by ISO/TC 131/SC 3 (Cylinders).
Using ISO 6099:2018 helps ensure consistent, searchable documentation for cylinder mounting dimensions and types - improving communication across design, manufacturing and purchasing workflows.
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