ISO 594-2:1998 is a connector requirements standard for conical lock (Luer lock) fittings with a 6% (Luer) taper used on syringes, needles, and certain other medical equipment. It focuses on the dimensional and functional fit of the locking connection so compatible components can assemble properly and perform as intended.
This document has been withdrawn and a newer connector framework is available. If you need help mapping an internal specification or legacy drawing callout to the correct current standard and verification approach, talk with our team.
ISO 594-2:1998 — Conical fittings with 6 % (Luer) taper for syringes, needles and certain other medical equipment — Part 2: Lock fittings
ISO 594-2:1998 addresses “Luer lock” style connectors where a 6% conical taper provides the primary fit and a locking feature helps secure the connection during use. The document provides requirements and includes associated test methods focused on connector fit and performance for medical applications.
ISO 594-2 applies to fittings made from rigid and semi-rigid materials. Flexible or elastomeric connector materials are not the focus of this document.
Quick Definition
Standard type: Connector requirements standard with included test methods (medical device connection interface).
In plain terms: It defines how Luer lock fittings are dimensioned and checked so parts from different sources can connect reliably and resist leakage or loosening in typical use conditions.
What This Standard Covers
ISO 594-2 focuses on lock fittings that use a 6% (Luer) taper and a locking mechanism. It is oriented around connector interface requirements rather than the performance of the overall medical device.
Coverage typically includes: dimensional and tolerance requirements for the lock fitting interface, functional fit with mating components, and verification checks described within the standard.
What it does not try to do: qualify the complete end product (for example, the full syringe, infusion set, or catheter system) beyond the connector interface characteristics addressed by the standard.
Why This Standard Matters in Testing
Connector nonconformities can create real downstream risk: leaks, poor interchangeability, unexpected disconnection, and assembly problems during manufacturing. ISO 594-2 style verification is often used to support connector design verification, supplier qualification, and incoming inspection for parts that must mate with standard Luer lock interfaces.
Because ISO 594-2:1998 has been withdrawn, many organizations treat it as a legacy reference and align new designs and test plans to the successor connector standard used in current regulatory and purchasing language.
Common Materials, Product Types, or Applications Covered
ISO 594-2 is most commonly encountered anywhere a Luer lock connection is used for fluid handling in medical devices.
- Hypodermic syringes and syringe components
- Needle hubs and related connection hardware
- Medical equipment using Luer lock style connections (for example, certain infusion/transfusion and fluid transfer assemblies)
- Connectors and adapters intended to be compatible with Luer lock interfaces
Common Test or Verification Workflow
ISO 594-2 is usually implemented as a connector verification and inspection workflow rather than a single “one machine” test. The typical intent is to demonstrate that a connector design or production lot meets interface requirements and performs consistently when mated to appropriate reference components.
Common workflows: design verification for new connector tooling, first-article inspection, supplier comparison, incoming QC gauging, and periodic production audits for critical connector dimensions and functional fit.
Practical note: Many labs run these checks using dedicated gauges and fixtures as part of a controlled metrology process, alongside basic pressure/leak evaluation where applicable.
Equipment Commonly Used for This Standard
Because ISO 594-2 is connector-interface focused, equipment selection typically centers on dimensional verification and controlled assembly/fit checks.
Common equipment families: Luer taper gauges and reference fittings (for checking mating geometry), inspection fixtures for repeatable connector engagement, calibrated measuring tools for critical dimensions, and leak/pressure test setups used with appropriate fixtures when a functional leakage check is part of the verification plan.
Quoting tip: The right package depends on whether you are doing incoming inspection at production speed, full design verification, or supplier qualification across multiple connector variants.
How to Read This Designation or Revision
ISO 594-2:1998 identifies Part 2 of the ISO 594 series and the publication year (1998) for that edition. This document is listed as withdrawn, and ISO provides a newer standard for the same general connector application area.
Revision sensitivity: Connector verification plans, reference components, and acceptance criteria can change between editions or when moving to the successor standard, so the exact cited designation in your drawings, specifications, or regulatory file matters.
Related Standards, Methods, or Frameworks when useful
ISO 594-2 is part of a multi-part connector series and is commonly encountered alongside general Luer taper requirements and later small-bore connector standards used for modern compliance.
Common related references: ISO 594-1 (general requirements for 6% Luer taper fittings) and ISO 80369-7 (successor connector standard for intravascular or hypodermic applications).
Get help selecting gauges and fixtures for Luer lock verification
If you are building a QC station or a design verification setup for Luer lock connectors and need a practical equipment path (gauges, reference fittings, and compatible leak/pressure fixtures), you can request a detailed quote matched to your connector types and throughput needs.