Does the QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 require special maintenance due to its AISI 316 construction and viton sealing?

No. The QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 does not require special maintenance solely because it is AISI 316 and uses Viton sealing. Standard maintenance practices for stainless steel fittings and Viton seals apply: keep the coupling clean, inspect regularly for wear, damage or contamination, replace seals if hardened, cracked or leaking, and avoid exposure to incompatible chemicals or temperatures beyond -26Â°C to +204Â°C. Follow normal inspection intervals for your application and ensure proper installation. The product is factory pressure-tested (68 bar) and rated to 206 bar; adherence to these limits and basic care will ensure reliable service.

Can the QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 be used with aggressive media beyond the stated temperature range?

QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 uses AISI 316 stainless steel body and Viton (FKM) seals, with an operating temperature range of â26Â°C to +204Â°C and working pressure up to 206 bar. Whether it can be used with aggressive media beyond the stated temperature range depends on two factors: 1. Chemical compatibility of Viton and AISI 316 with the specific aggressive media at the actual operating temperature and pressure. Viton resists many oils, fuels, and some chemicals, but is attacked by certain ketones, esters, hot acids, and some amines. AISI 316 is corrosion-resistant but can suffer pitting/crevice corrosion in chloride-rich or strongly oxidizing environments. 2. Temperature-driven degradation of the seal: operating above +204Â°C or below â26Â°C can cause loss of seal integrity (swelling, hardening, cracking or extrusion), leading to leaks and possible rapid failure when exposed to aggressive chemicals. Conclusion: Do not use QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 outside the specified temperature range without prior validation. For aggressive media beyond that range, consult the manufacturer for alternative seal materials (e.g., PTFE, EPDM, Kalrez) and confirm compatibility tests or select a coupling specifically rated for the higher/lower temperatures and chemical exposure. If in doubt, perform compatibility testing under actual service conditions.

QC-LOK® bulkhead socket with connection for tube, stainless steel, type QC4

Q: Is the QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 compatible with other manufacturers' instrumentation standard quick couplings?

Yes. The QC-LOKÂ® bulkhead socket with connection for tube, stainless steel, type QC4 is compatible with other manufacturers' instrumentation standard quick couplings. The QC4 is described as compliant with the Instrumentation standard, interchangeable with instrumentation standard quick couplings from other manufacturers, and factory tested for leaks (68 bar). Its AISI 316 construction, Viton sealing, and wide temperature and pressure ratings (working pressure up to 206 bar, operating temperature -26Â°C to +204Â°C) support reliable interchangeability in typical instrumentation applications.

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QC-LOK® bulkhead socket with connection for tube, stainless steel, type QC4

Additional information

Material	SS – stainless steel

Quick coupling socket QC4 compliant with Standard Instrumentation with valve, with LET-LOK® connection, for panel mounting. 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 leaks. 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	Price	Quantity	Actions	Catalogue
HM-QC4-B-LBC-04-SS	Quick-connect bulkhead socket QC4, LET-LOK 1/4", SS	-	206	In stock	0 zł		Enquiry
HM-QC4-B-LBM-06-SS	Quick-connect bulkhead socket QC4, LET-LOK 6 mm, SS	-	206	In stock	0 zł		Enquiry

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Quick coupling socket QC4 compliant with Standard Instrumentation with valve, with LET-LOK® connection, for panel mounting. 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 leaks. 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.