ISO 10766:2014

Overview

ISO 10766:2014 - Hydraulic fluid power - Cylinders - Housing dimensions for rectangular‑section‑cut bearing rings for pistons and rods - defines preferred nominal dimensions and associated tolerances for housings that accept rectangular-section cut bearing rings in hydraulic cylinders. The standard covers cylinder bores from 16 mm to 500 mm and rod diameters from 12 mm to 450 mm. It standardizes housing geometry, tolerances and surface-finish guidance, but does not prescribe cut bearing ring design or materials (these vary by manufacturer and application).

Key topics and requirements

• Scope and nominal sizes: Preferred ranges for housing axial lengths (L) and radial depths (S) are given (examples of L: 4, 5.6, 9.7, 15, 25 mm; S examples: 1.55, 2.5, 4 mm).
• Housing geometry: Detailed groove and housing dimensions for pistons and rods are specified (see Clause 7 and Tables 2–3 in the standard).
• Tolerances: Dimensional tolerances reference ISO 286‑2 classes (AL: H10; D: H8/H9; d: f8/f9; typical rod fits f8 to h9).
• Surface finish: Recommended maximums for housing surfaces are Ra ≤ 3.2 μm and Rt ≤ 16 μm; working surfaces (bore or rod) preferably Ra ≤ 0.6 μm and Rt ≤ 2.4 μm. Instruments conforming to ISO 3274 are recommended for measurement.
• Run‑out and clearance: Maximum run‑out tolerance between multiple groove diameters is 0.05 mm. Diametral clearance definitions for piston (AL − P) and rod (G − MM) control extrusion gaps for seals and should be coordinated with bearing ring manufacturers.
• General workmanship: Remove sharp edges/burrs; corners to be rounded or chamfered.

Applications and users

ISO 10766:2014 is used by:

• Hydraulic cylinder designers and OEMs specifying piston and rod housings
• Component manufacturers producing housings for rectangular cut bearing rings
• Seal and bearing ring manufacturers coordinating extrusion gaps and fits
• Maintenance engineers and procurement teams ensuring interchangeability and compliance

Typical applications include industrial and mobile hydraulic cylinders where rectangular-section cut bearing rings are used to support pistons and rods under side loads.

Related standards

Relevant cross-references for complete hydraulic cylinder design and tolerancing:

• ISO 3320 (bore and rod preferred sizes)
• ISO 286‑2 (tolerance classes)
• ISO 4287 / ISO 3274 (surface texture and measurement)
• ISO 5597 (seal housings and sealing considerations)
• ISO 5598, ISO 6099 and other GPS/geometry standards

Use the identification statement when claiming compliance: “Housings for rectangular-section-cut bearings rings for pistons and rods conform to ISO 10766:2014.”