ISO 6149-2:2006 PDF

Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261 metric threads and O-ring sealing — Part 2: Dimensions, design, test methods and requirements for heavy-duty (S series) stud ends

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Title (English):

ISO 6149-2:2006

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: February 16, 2006
Edition:: ISO IS 6149 edition 2 version 1
ICS:: 23.100.40

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Description (English):

ISO 6149-2:2006 specifies dimensions, performance requirements and test procedures for metric adjustable and non-adjustable heavy-duty (S series) stud ends and O-rings. Stud ends in accordance with ISO 6149-2:2006 may be used at working pressures up to 63 MPa (630 bar) for non-adjustable stud ends and 40 MPa (400 bar) for adjustable stud ends. The permissible working pressure depends upon the stud end size, materials, design, working conditions, application, etc.

Technical details

Technical committee: ISO/TC 131/SC 4 - Connectors and similar products and components
SKU: ISO 6149-2:2006

Abstract

Overview

ISO 6149-2:2006 - Connections for hydraulic fluid power and general use - Part 2 defines the dimensions, design, test methods and requirements for heavy‑duty (S series) metric stud ends with O‑ring sealing. It covers both adjustable and non‑adjustable stud ends with ISO 261 metric threads and specifies performance limits, identification, O‑ring details and required testing for hydraulic and general‑pressure applications.

Key topics and technical requirements

Threading and dimensions: Stud ends use ISO 261 general‑purpose metric threads (tolerance grade 6g per ISO 965‑1). Detailed dimensional drawings and tables for S‑series stud ends are provided (see Figures 1–3 and Table 1 in the standard).
Working pressures: Permissible working pressures depend on size, material and design. Typical limits given:
- Non‑adjustable stud ends: up to 63 MPa (630 bar)
- Adjustable stud ends: up to 40 MPa (400 bar)
- Actual allowable pressure varies by thread size and application (see Table 2).
Performance testing: Burst and cyclic endurance (impulse) tests are required and shall be conducted in accordance with ISO 19879. Conformance to dimensions alone does not guarantee rated performance - manufacturers must perform the specified tests.
O‑rings: Default material for petroleum‑based hydraulic fluids is NBR (nitrile) with hardness 90 ± 5 IRHD and quality grade N per ISO 3601‑3. O‑ring sizes and tolerances are specified for S‑series stud ends.
Design and assembly: Requirements for adjustable stud end washers (clinch washer fit, flatness allowances and maximum nut torques) are given (Table 3). Hex across‑flat tolerances follow ISO 4759‑1, product grade C.
Identification & designation: Standardized marking and designation format (e.g., “Stud end ISO 6149‑2 – M18 × 1,5”) and machining/notch identification rules are specified.

Applications and who uses it

ISO 6149‑2 is intended for:

Hydraulic system designers and OEMs specifying ports and stud ends for high‑pressure fluid power systems
Component manufacturers (connectors, hose fittings, plugs) producing heavy‑duty (S series) stud ends
Quality, testing and certification labs performing burst and impulse tests
Maintenance engineers and procurement professionals ensuring interchangeability and safety in hydraulic installations

Practical uses include connections to tubes, pipes, hose fittings and cartridge valve plugs in industrial, mobile and offshore hydraulic equipment.

Related standards

ISO 6149 series (Parts 1, 2, 3, 4) - recommended metric thread/O‑ring system for new hydraulic designs
ISO 261 / ISO 965‑1 - metric thread definitions and tolerances
ISO 3601‑3 - O‑ring quality acceptance criteria
ISO 19879 - test methods for hydraulic fluid power connections
ISO 8434‑1, ISO 8434‑3, ISO 8434‑4 - connector details referenced by ISO 6149‑2

Keywords: ISO 6149-2, stud ends, heavy‑duty S series, O‑ring sealing, ISO 261 metric threads, hydraulic fluid power, burst test, impulse test, NBR O‑ring.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Threading and dimensions: Stud ends use ISO 261 general‑purpose metric threads (tolerance grade 6g per ISO 965‑1). Detailed dimensional drawings and tables for S‑series stud ends are provided (see Figures 1–3 and Table 1 in the standard).
Working pressures: Permissible working pressures depend on size, material and design. Typical limits given:
- Non‑adjustable stud ends: up to 63 MPa (630 bar)
- Adjustable stud ends: up to 40 MPa (400 bar)
- Actual allowable pressure varies by thread size and application (see Table 2).
Performance testing: Burst and cyclic endurance (impulse) tests are required and shall be conducted in accordance with ISO 19879. Conformance to dimensions alone does not guarantee rated performance - manufacturers must perform the specified tests.
O‑rings: Default material for petroleum‑based hydraulic fluids is NBR (nitrile) with hardness 90 ± 5 IRHD and quality grade N per ISO 3601‑3. O‑ring sizes and tolerances are specified for S‑series stud ends.
Design and assembly: Requirements for adjustable stud end washers (clinch washer fit, flatness allowances and maximum nut torques) are given (Table 3). Hex across‑flat tolerances follow ISO 4759‑1, product grade C.
Identification & designation: Standardized marking and designation format (e.g., “Stud end ISO 6149‑2 – M18 × 1,5”) and machining/notch identification rules are specified.

Applications and who uses it

ISO 6149‑2 is intended for:

Hydraulic system designers and OEMs specifying ports and stud ends for high‑pressure fluid power systems
Component manufacturers (connectors, hose fittings, plugs) producing heavy‑duty (S series) stud ends
Quality, testing and certification labs performing burst and impulse tests
Maintenance engineers and procurement professionals ensuring interchangeability and safety in hydraulic installations

Practical uses include connections to tubes, pipes, hose fittings and cartridge valve plugs in industrial, mobile and offshore hydraulic equipment.

Related standards

ISO 6149 series (Parts 1, 2, 3, 4) - recommended metric thread/O‑ring system for new hydraulic designs
ISO 261 / ISO 965‑1 - metric thread definitions and tolerances
ISO 3601‑3 - O‑ring quality acceptance criteria
ISO 19879 - test methods for hydraulic fluid power connections
ISO 8434‑1, ISO 8434‑3, ISO 8434‑4 - connector details referenced by ISO 6149‑2

Keywords: ISO 6149-2, stud ends, heavy‑duty S series, O‑ring sealing, ISO 261 metric threads, hydraulic fluid power, burst test, impulse test, NBR O‑ring.

ISO 6149-2:2006 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Related standards

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