BS ISO 8434-3-2005 PDF

Full title and description

STB BS ISO 8434-3:2005 — Metallic tube connections for fluid power and general use — Part 3: 37° flared fittings.

Abstract

This standard specifies the requirements for 37° flared fittings and corresponding tubes used in metallic tube connections for hydraulic fluid power and general use. It covers dimensions, materials, mechanical properties, tolerances, marking and performance requirements to ensure reliable, pressure-tight, reusable connections between tubes and mating components.

General information

• Status: Published / In force (2005)
• Publication date: 2005
• Publisher: British Standards / ISO (adopted as a national/partner publication)
• ICS / categories: 23.120.20 (Fluid power systems), 21.060 (Pipes and tubes)
• Edition / version: 1st edition (2005)
• Number of pages: Typically around 20–30 pages (varies by national adoption)

Scope

Specifies the requirements for 37° flared fittings and the compatible tubes intended for hydraulic fluid power and general industrial use. Includes dimensional series, pressure-temperature ratings, material and hardness limits, assembly requirements and tests to verify performance. Excludes hose fittings, non-metallic connections and specialized aerospace applications unless explicitly referenced.

Key topics and requirements

• Dimensional specifications for 37° flared seating surfaces and mating parts.
• Material and hardness requirements for fittings and sleeves to ensure durability and sealing.
• Thread types and tolerances for nuts and mating components.
• Pressure and temperature ratings and associated test procedures (e.g., leak, burst and cyclic tests).
• Assembly instructions including tube-end forming (flaring) and required clearances.
• Marking, identification and traceability of fittings and components.
• Applicable inspection and acceptance criteria for production and after testing.

Typical use and users

Used by designers, manufacturers and maintenance personnel in hydraulic systems, industrial machinery, mobile equipment and general piping systems where reusable metal tube fittings are required. Relevant for procurement, quality control, testing laboratories and certification bodies involved with fluid power connections.

Related standards

Related parts of the ISO 8434 series (other connection types and sizes), standards covering tube materials and tubing preparation, thread standards for hydraulic fittings, pressure testing and fluid power system standards. Also associated with national adoptions (e.g., BS EN or other national listings) and complementary ISO standards for hose and coupling types.

Keywords

37° flare, flared fittings, metallic tube connections, hydraulic fittings, tube flaring, fluid power, sealing seat, pressure rating, assembly, ISO 8434-3, BS ISO 8434-3

FAQ

Q: What is this standard?

A: It is the ISO 8434-3 specification adopted as a British/national publication that defines requirements for 37° flared metallic tube fittings used in hydraulic fluid power and general industrial applications.

Q: What does it cover?

A: Dimensions, materials, mechanical and performance requirements, assembly and testing criteria for 37° flared fittings and compatible tubes, including marking and inspection provisions.

Q: Who typically uses it?

A: Engineers, product designers, manufacturers of fittings and hydraulic components, maintenance teams, quality inspectors and testing laboratories involved with fluid power systems and metal tube connections.

Q: Is it current or superseded?

A: The document referenced is the 2005 publication. Users should verify with their national standards body for any amendments, updates or later revisions that may supersede the 2005 edition.

Q: Is it part of a series?

A: Yes — it is part 3 of the ISO 8434 series, which covers various types of metallic tube connections for fluid power and general use.

Q: What are the key keywords?

A: 37° flared fittings, metallic tube connections, hydraulic fittings, ISO 8434-3, tube flare, fluid power connections.