SAE J533-2024 PDF

Full title and description

SAE J533-2024 — Flares for Tubing. Specification that defines the dimensional, material and workmanship requirements and performance-related criteria for 37° and 45° single and double flares on metallic tubing intended for use with SAE and ISO flared connectors (including SAE J512, J513, J514 and ISO 8434‑2). The document promotes consistent flare geometry, suitable tolerances, and guidance for use with metric and imperial tube sizes used in hydraulic, refrigeration and general fluid‑power systems.

Abstract

This standard establishes dimensions, tolerances, and workmanship requirements for single and double 37° and 45° flares on tubing, plus related acceptance criteria and notes on tube material and wall thickness considerations. It ensures interchangeability and sealing performance with corresponding SAE and ISO flared fittings, and includes guidance on concentricity, finish, permissible defects and references to applicable pressure and material standards.

General information

• Status: Current / Active
• Publication date: August 12, 2024
• Publisher: SAE International (Society of Automotive Engineers)
• ICS / categories: 43.040 (Road vehicles engineering — Road vehicle systems); 23.040 (Pipes, valves and fittings / Pipeline components)
• Edition / version: 2024 edition (SAE J533-2024)
• Number of pages: 10

Scope

Specifies the geometry, dimensional tolerances and workmanship criteria for 37° and 45° single and double flares formed on metallic tubing intended for use with SAE and ISO flared connectors. The scope covers flange/seating dimensions, concentricity, surface condition, permissible defects, and notes on appropriate tube wall thickness selection for intended working pressures. It does not replace requirements of mating connector standards but references them for compatibility and pressure guidance.

Key topics and requirements

• Dimensional specifications for 37° and 45° single and double flares (nominal sizes and tolerances).
• Requirements for seating surface quality, concentricity and acceptable surface defects (nicks, cracks, burrs).
• Workmanship and inspection criteria for flared tube ends (formation method, radiusing, break‑out conditions).
• Compatibility and intended use with SAE J512, J513, J514 and ISO 8434‑2 connectors.
• Guidance on tube material selection and wall thickness considerations relative to nominal working pressures (references SAE J1065 and ISO 10763).
• Promotion of metric tube and connector sizes to support global standardization and reduce inventory duplication.

Typical use and users

Used by OEM engineers, hydraulic and fluid‑power designers, tubing and fitting manufacturers, tube fabricators and assembly shops, HVAC/refrigeration technicians, quality and inspection personnel, and suppliers of flaring tools and equipment. Typical applications include hydraulic systems, refrigeration and air‑conditioning lines, automotive and commercial vehicle fluid systems, and general industrial tubing installations requiring flared connections.

Related standards

Commonly referenced with and complementary to: SAE J512 (tube specifications), SAE J513 (refrigeration tube fittings / general specifications), SAE J514 (hydraulic tube fittings), ISO 8434‑2 (37° flared connectors), SAE J1065 and ISO 10763 (nominal working pressures for hydraulic tubing), and ASTM/other material specifications used for tubing (for example ASTM A179 where applicable).

Keywords

flares, tubing, 37 degree, 45 degree, single flare, double flare, hydraulic tubing, flared fittings, JIC, SAE, ISO 8434‑2, tube dimensions, workmanship, concentricity, metric conversion

FAQ

Q: What is this standard?

A: SAE J533-2024 specifies the dimensions, tolerances and workmanship requirements for 37° and 45° single and double flares on metallic tubing to ensure proper sealing and interchangeability with SAE/ISO flared connectors.

Q: What does it cover?

A: It covers flare geometry (37° and 45°), dimensional tolerances, seating surface quality, concentricity limits, acceptable defects, and guidance on tube material and wall thickness selection. It references mating connector standards for full assembly requirements.

Q: Who typically uses it?

A: Hydraulic system designers, tubing and fittings manufacturers, HVAC/refrigeration technicians, OEM production and maintenance teams, and quality/inspection personnel responsible for forming and verifying flared tube ends.

Q: Is it current or superseded?

A: It is current. The 2024 edition (published August 12, 2024) is the active version and replaces the previous edition (for example the 2020 revision).

Q: Is it part of a series?

A: Yes — it is part of SAE's family of J‑series standards covering tubing, fittings and connector interfaces. It is commonly used together with SAE J512, J513 and J514 and with ISO 8434‑2 for flared connector compatibility.

Q: What are the key keywords?

A: Flares, tubing, 37°, 45°, single flare, double flare, hydraulic, fittings, SAE J533, ISO 8434‑2, concentricity, workmanship.