OTHM External Quick Connectors High Pressure Testing

Overview of OTHM External Quick Connectors

The OTHM series external quick connectors are engineered for pressure and vacuum testing, filling, sealing, and venting of externally threaded components. Designed for industrial clients who require repeatable, tool-free connections on production lines and quality control stations, each connector screws onto the threaded test piece by hand until the O-ring reaches proper compression. No wrench, thread sealant, or PTFE tape is needed to achieve a reliable seal. The series can be configured as a through-type connector with a medium inlet or as a standalone plug, allowing flexibility across different test setups. Manufactured by Hefei Yuanzhi Automation Technology, the OTHM line covers metric, G (BSPP), NPT, and SAE J514 JIC37 thread standards.

Key Design Features of OTHM Quick Connectors

Materials and Construction

The main structural components are machined from corrosion-resistant stainless steel, providing dimensional stability and durability in industrial test environments. The standard sealing element is nitrile rubber (NBR), which meets most operational requirements for air and inert gas testing. Alternative seal materials and custom dimensions can be developed upon request to accommodate specific temperature ranges, test media, or space constraints.

Pressure Rating and Sealing Performance

The OTHM series supports both positive pressure and vacuum testing. Metric, G-thread, and NPT-thread models carry a maximum test pressure of 50 bar, while SAE J514 JIC37 (UNF/UN) models are rated up to 350 bar. The reference leakage rate is 10⁻³ mbar·L/s, equivalent to 10⁻⁴ Pa·m³/s. Lower leakage rates can be achieved depending on the test method, operating temperature and pressure, and the surface quality of the supplied sample, including seal surface treatment, roughness, and dimensional tolerances.

Technical Specifications for OTHM External Quick Connectors

OTHM Series Detail Table

According to the SAE J514 JIC37 standard

Operating Steps for OTHM Quick Connectors

Align the OTHM connector with the externally threaded test piece.

Screw the connector onto the thread by hand until the O-ring is properly compressed.

Connect the test medium supply line and apply the required test pressure.

After testing is complete, fully release the test pressure before unscrewing and removing the connector.

Applications of OTHM External Quick Connectors

OTHM external quick connectors serve automotive component manufacturing, hydraulic and pneumatic system assembly, plumbing and valve production, and industrial equipment testing where externally threaded ports require pressure decay, vacuum decay, or flow verification. The hand-tight design reduces per-piece connection time compared with tool-dependent threaded fittings, supporting higher throughput on semi-automated and manual test stations. The through-type and plug configurations allow the same connector body to be used for both pressurized testing and port blanking.

Ordering Information for OTHM Quick Connectors

To specify a suitable connector, please provide the following when requesting a quote: part number or thread specification, required pressure range, test medium and target leakage rate, operating temperature range, available installation space, and the test piece dimensions or CAD drawing. If a standard catalog model does not match your application, custom configurations can be evaluated based on sample submission.

FAQ About OTHM External Quick Connectors

What thread standards are available for OTHM connectors?

The OTHM series covers metric (M), G (BSPP), NPT, and SAE J514 JIC37 (UNF/UN) external thread types.

What is the maximum test pressure?

Metric, G, and NPT models are rated up to 50 bar. SAE J514 JIC37 models support up to 350 bar.

Can OTHM connectors be used for vacuum testing?

Yes. The OTHM series is designed for both positive pressure and vacuum (negative pressure) testing applications.

What seal material is fitted as standard?

Nitrile rubber (NBR) is the standard seal. Alternative materials are available on request for specific temperature or chemical compatibility requirements.

Are custom sizes available?

Yes. Dimensions and seal configurations marked as available upon request can be customized based on customer specifications and sample evaluation.