Is the QC-LOKÂ® quick connector plug with tube connection, stainless steel, type QC4 compatible with other Instrumentation standard quick couplings from different manufacturers?

Yes. The QC-LOKÂ® quick connector plug with tube connection, stainless steel, type QC4 is compatible with other Instrumentation standard quick couplings from different manufacturers. It is designed compliant with the Instrumentation standard and stated as interchangeable with quick couplings of that standard. QC4 is factory tested (68 bar), rated to 206 bar working pressure, made of AISI 316, with Viton seals and operating range â26Â°C to +204Â°C; available with or without a valve.

Can the QC-LOKÂ® quick connector plug with tube connection, stainless steel, type QC4 be used in medical and pharmaceutical applications?

Yes. The QC-LOKÂ® quick connector plug with tube connection, stainless steel, type QC4 is suitable for medical and pharmaceutical applications. It is expressly listed for use in aviation, gas industry, medical, pharmaceutical, and laboratory environments; constructed from AISI 316 stainless steel, uses Viton sealing, and is factory-tested to 68 bar for leakage (working pressure 206 bar), with an operating temperature range of -26Â°C to +204Â°C. Versions with and without valve are available and it is interchangeable with instrumentation-standard couplings from other manufacturers.

Does the QC-LOKÂ® quick connector plug with tube connection, stainless steel, type QC4 require special maintenance or inspection intervals?

QC-LOKÂ® quick connector plug with tube connection, stainless steel, type QC4 does not require any special maintenance beyond standard good-practice inspection and care appropriate for high-pressure stainless-steel instrumentation fittings. Recommended routine actions: - Visual inspection before use: check for external damage, corrosion, nicks or deformation to the body, coupling surfaces and tube connection. - Seal check: inspect the Viton sealing for cuts, hardening, swelling or contamination; replace seals if any damage or aging is detected. - Functional check: operate the coupling (connect/disconnect) to ensure smooth action; verify valve (if fitted) opens/closes properly and is leakâtight. - Leak test: periodically perform a pressure/leak test in-line in accordance with system safety proceduresâfactory test was 68 bar and working pressure is 206 bar, so follow your facilityâs interval and pressure-test protocol (e.g., after installation, after maintenance, or at scheduled inspection intervals). - Cleaning: keep the coupling clean from debris and aggressive chemicals; use compatible cleaning agents to avoid damaging Viton or stainless steel. - Documentation and intervals: follow your organizationâs risk-based maintenance schedule; critical applications (aviation, medical, pharma, gas labs) typically require documented periodic inspections and leak testingâfrequency depends on operating conditions and regulatory requirements. If used under extreme conditions (abrasive media, frequent cycling, corrosive environments, or near temperature limits â26Â°C to +204Â°C), increase inspection frequency and replace seals more often. For specific regulatory or industry-mandated intervals consult applicable standards and your quality/safety department.

QC-LOK® quick connector plug with tube connection, stainless steel, type QC4

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Additional information

Material	SS – stainless steel

QC4 quick coupling plug compliant with Standard Instrumentation, with LET-LOK® connection. QC4 is a high-quality quick coupling used in aviation, gas industry, medical, pharmaceutical, and laboratories. All quick couplings are factory tested at a pressure of 68 bar to check for leakage. Interchangeable with quick couplings of Instrumentation standard from other manufacturers. The plug is available in versions without a valve and with a valve. Material: AISI 316 steel. Working pressure: 206 bar. Sealing: viton. Operating temperature: from -26°C to +204°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HM-QC4-D-LC-04-SS	QC4 quick coupling plug, LET-LOK 1/4", SS, with valve	-	206	In stock	Enquiry
HM-QC4-D-LM-06-SS	QC4 quick connector plug, LET-LOK 6 mm, SS, with valve	-	206	In stock	Enquiry
HM-QC4-S-LC-02-SS	QC4 quick coupling plug, LET-LOK 1/8", SS, without valve	-	206	In stock	Enquiry
HM-QC4-S-LC-04-SS	QC4 quick coupling plug, LET-LOK 1/4", SS, without valve	-	206	In stock	Enquiry
HM-QC4-S-LM-06-SS	QC4 quick coupling plug, LET-LOK 6 mm, SS, without valve	-	206	In stock	Enquiry

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QC4 quick coupling plug compliant with Standard Instrumentation, with LET-LOK® connection. QC4 is a high-quality quick coupling used in aviation, gas industry, medical, pharmaceutical, and laboratories. All quick couplings are factory tested at a pressure of 68 bar to check for leakage. Interchangeable with quick couplings of Instrumentation standard from other manufacturers. The plug is available in versions without a valve and with a valve. Material: AISI 316 steel. Working pressure: 206 bar. Sealing: viton. Operating temperature: from -26°C to +204°C.