Is the QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 compatible with other instrumentation standard quick couplings?

Yes. The QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 is compatible with other instrumentation standard quick couplings. It is expressly described as compliant with the Instrumentation Standard and interchangeable with instrumentation standard quick couplings from other manufacturers. Made of AISI 316 stainless steel, fitted with a valve, available with external NPT, BSPT or BSP threads, factory-tested for tightness at 68 bar, and rated for working pressure up to 206 bar with Viton seals and an operating range of -26Â°C to +204Â°C, the QC4 is designed to mate with standard instrumentation quick couplings used across aviation, gas, medical, pharmaceutical and laboratory applications.

Does the QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 require special maintenance after factory testing at 68 bar?

No. QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 does not require special maintenance after factory testing at 68 bar. The factory test verifies tightness; the coupling is made of AISI 316 stainless steel, rated to 206 bar, with Viton seals and an operating range of â26Â°C to +204Â°C. Normal periodic inspections and standard maintenance (visual inspection, cleaning, seal checks/replacement as needed, and correct installation) are sufficient to ensure continued safe operation.

Can the QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 be used with gases requiring specific seals (e.g., fluorocarbon-free)?

QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 is supplied with Viton (fluorocarbon) seals according to the product description. If the gas service specifically requires fluorocarbon-free seals (e.g., for compatibility, regulatory or contamination reasons), the standard QC4 with Viton sealing is not suitable as delivered. Options: - If the manufacturer or supplier offers alternative seal materials (e.g., EPDM, PTFE, perfluoroelastomer, or other specified fluorocarbon-free elastomers) those must be specified at order and verified for compatibility with the gas, pressure (up to 206 bar working, 68 bar factory tightness test) and temperature range (â26Â°C to +204Â°C). - If no alternative seals are available from the vendor, do not use the standard QC-LOKÂ® quick connector socket with male thread, stainless steel, type QC4 for gases requiring fluorocarbon-free seals; select a coupling explicitly certified with approved non-fluorocarbon seal materials. Always confirm seal material certification with the manufacturer and perform compatibility testing for the specific gas, temperature and pressure conditions before use.

QC-LOK® quick connector socket with male thread, stainless steel, type QC4

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Additional information

Material	SS – stainless steel

Quick coupling socket QC4 compliant with Instrumentation Standard, with valve, with external thread NPT, BSPT or BSP. 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 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-MG-02-SS	QC4 quick coupling socket, GZ 1/8" BSP, SS	-	206	In stock	Enquiry
HM-QC4-B-MG-04-SS	QC4 quick coupling socket, GZ 1/4" BSP, SS	-	206	In stock	Enquiry
HM-QC4-B-MN-02-SS	QC4 quick coupling socket, GZ 1/8" NPT, SS	-	206	In stock	Enquiry
HM-QC4-B-MN-04-SS	QC4 quick coupling socket, GZ 1/4" NPT, SS	-	206	In stock	Enquiry
HM-QC4-B-MR-02-SS	QC4 quick connector socket, GZ 1/8" BSPT, SS	-	206	In stock	Enquiry
HM-QC4-B-MR-04-SS	QC4 quick coupling socket, GZ 1/4" BSPT, SS	-	206	In stock	Enquiry

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Quick coupling socket QC4 compliant with Instrumentation Standard, with valve, with external thread NPT, BSPT or BSP. 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 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.