JB N5-4 1/4" SAE Fitting Cap

The JB N5-4 1/4" SAE Fitting Cap is a critical component for any technician maintaining the integrity of HVACR refrigeration systems. Built from heavy-duty forged brass, this 1/4 inch flare cap is engineered to provide a positive seal on access valves and flare fittings, preventing refrigerant loss and protecting system components from moisture and non-condensables. Unlike lower-quality imports, these caps feature high-tensile C360 brass construction, ensuring they withstand the rigors of field service without cracking or thinning. These SAE J513 compliant fittings are rated for high-pressure ACR applications, handling vacuum and pressures up to 5,000 psi depending on environmental conditions. Whether you are sealing off a recovery tank or capping ductless mini-split lines, the precision-machined threads and dryseal taper minimize leakage. This fitting is versatile enough for use with copper, aluminum, steel, and plastic tubing, making it a staple in your refrigeration service bag for consistent, leak-free performance on every job site.

• Forged Brass Strength: Constructed from premium brass with 65% copper content for superior corrosion resistance and high-tensile strength.
• Universal Compatibility: Designed for 1/4" SAE flare connections across HVAC, hydraulic, and marine refrigeration systems.
• Leak Prevention: Precision threads and robust design ensure a secure, airtight seal to maintain system vacuum and pressure.
• Industrial Durability: Engineered to eliminate stress cracking, even in high-vibration applications when paired with appropriate tubing preparation.

What is the maximum pressure rating for this 1/4" flare cap?
The JB N5-4 is rated for vacuum and pressures up to 5,000 psi, though technical performance is typically limited by the specific system valve core or tubing material used.

Can these caps be used with all types of refrigerants?
Yes, the brass construction is compatible with standard CFC, HCFC, and HFC refrigerants, including R-410A, making them a versatile choice for modern cooling systems.

Do I need to use thread sealant with this fitting?
While the SAE flare is a mechanical seal, many veteran technicians recommend a drop of compatible refrigerant oil or Nylog on the mating surfaces to ensure a smooth, positive seat without over-torquing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.