Is the QC-LOKÂ® quick-connect socket with tube connection, stainless steel, type QC4 compatible with other Instrumentation standard quick couplings?

Yes. The QC-LOKÂ® quick-connect socket with tube connection, stainless steel, type QC4 is compliant with the Instrumentation standard and is explicitly described as interchangeable with Instrumentation standard quick couplings from other manufacturers. It is built from AISI 316 stainless steel, uses a LET-LOKÂ® connection, is factory-tested to 68 bar (working pressure 206 bar), and features Viton sealing (operating temperature -26Â°C to +204Â°C), ensuring compatibility and reliable performance with other standard Instrumentation quick couplings.

Does the QC-LOKÂ® quick-connect socket with tube connection, stainless steel, type QC4 require special maintenance for viton seals?

No special maintenance beyond standard best practices is required for the viton seals in the QC-LOKÂ® quick-connect socket with tube connection, stainless steel, type QC4. Viton is compatible with the QC4âs operating temperature range (â26Â°C to +204Â°C) and the socket is factory-tested for tightness. Routine care: keep seals clean and free of debris, inspect periodically for wear, cuts or hardening, replace seals if damaged or after prolonged service, avoid exposure to incompatible chemicals outside vitonâs chemical compatibility, and lubricate with a compatible, non-reactive lubricant if needed. Follow general QC4 maintenance intervals and manufacturer guidance for replacement.

QC-LOK® quick-connect socket with tube connection, stainless steel, type QC4

Q: Can the QC-LOKÂ® quick-connect socket with tube connection, stainless steel, type QC4 be used at cryogenic temperatures?

No. The QC-LOKÂ® quick-connect socket with tube connection, stainless steel, type QC4 cannot be used at cryogenic temperatures. Its specified operating temperature range is from â26Â°C to +204Â°C and its sealing material is Viton, which is not suitable for cryogenic service. Using it below the minimum rated temperature risks seal hardening/failure, loss of leak-tightness and possible material embrittlement. For cryogenic applications select a coupling and seals specifically rated for the required low temperatures (e.g., low-temperature elastomers or metal-to-metal seals and materials certified for cryogenic service).

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QC-LOK® quick-connect socket with tube connection, stainless steel, type QC4

Additional information

Material	SS – stainless steel

QC4 quick coupling socket compliant with the Standard Instrumentation standard with a valve, featuring a LET-LOK® connection. QC4 is a high-quality quick coupling used in aviation, gas industry, medical, pharmaceutical, and laboratory applications. All quick couplings are factory tested at a pressure of 68 bar to check for tightness. Interchangeable with Instrumentation standard quick couplings from other manufacturers. 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-B-LC-02-SS	QC4 quick coupling socket, LET-LOK 1/8", SS	-	206	In stock	Enquiry
HM-QC4-B-LC-04-SS	QC4 quick coupling socket, LET-LOK 1/4", SS	-	206	In stock	Enquiry
HM-QC4-B-LM-06-SS	QC4 quick connector socket, LET-LOK 6 mm, SS	-	206	In stock	Enquiry

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QC4 quick coupling socket compliant with the Standard Instrumentation standard with a valve, featuring a LET-LOK® connection. QC4 is a high-quality quick coupling used in aviation, gas industry, medical, pharmaceutical, and laboratory applications. All quick couplings are factory tested at a pressure of 68 bar to check for tightness. Interchangeable with Instrumentation standard quick couplings from other manufacturers. Material: AISI 316 steel. Working pressure: 206 bar. Sealing: viton. Operating temperature: from -26°C to +204°C.