High-Pressure Discharge Automotive AC Hose Assembly Steel End Fittings 13mm ID 4000 PSI Rated

The WNRLN HP-4000 is a heavy-duty high-pressure discharge AC hose assembly specifically engineered for the extreme conditions encountered on the compressor-to-condenser high-side circuit of automotive air conditioning systems. Constructed with a multi-layer reinforced synthetic rubber core, a braided steel wire reinforcement layer, and zinc-plated carbon steel end fittings, this hose assembly is rated for a maximum working pressure of 600 PSI with an impressive 4000 PSI burst pressure safety margin. The 13mm inner diameter is optimized for the mass flow rates typical of mid-size to full-size passenger car and light truck AC systems operating with R134a or R404A refrigerant. Each assembly is factory-crimped using a CNC-controlled hydraulic crimping station that guarantees consistent compression of the ferrule onto the hose body, eliminating the variability inherent in manual or field-crimped connections.

The steel end fittings are manufactured from cold-forged carbon steel and finished with a multi-layer zinc electroplating process that provides over 500 hours of neutral salt spray corrosion resistance per ASTM B117 testing. The fitting geometry incorporates a precision-machined O-ring gland that accepts standard HNBR O-rings compatible with R134a and PAG oil systems. The hose body itself features a four-layer construction: an innermost HNBR tube resistant to refrigerant and oil chemical attack, a braided steel wire reinforcement layer that provides hoop strength for pressure containment, a synthetic rubber cushion layer that isolates the braid from external abrasion, and an outermost EPDM cover compound formulated for heat resistance up to 150 C. This layered architecture has been validated through extensive thermal cycling tests that simulate decades of under-hood service, including rapid temperature transitions from -30 C cold-soak conditions to sustained 150 C compressor discharge gas exposure. Every completed assembly undergoes a hydrostatic proof test at 1200 PSI followed by a helium mass spectrometer leak check, ensuring zero-defect performance at installation.

• 4000 PSI Burst Pressure Rating: The braided steel wire reinforcement provides a nearly 7:1 safety factor over the 600 PSI maximum working pressure, ensuring robust protection against pressure spikes during compressor cycling and thermal expansion events.
• Zinc-Plated Steel End Fittings: Cold-forged carbon steel fittings with multi-layer zinc electroplating deliver 500+ hours of salt spray corrosion resistance, significantly outlasting standard zinc-plated or bare steel alternatives in humid and coastal environments.
• 150 C Continuous Temperature Rating: The EPDM outer cover and HNBR inner tube are formulated for sustained exposure to compressor discharge gas temperatures up to 150 C without hardening, cracking, or loss of mechanical properties.
• CNC Hydraulic Crimping Process: Factory crimping with closed-loop force feedback ensures every ferrule achieves the exact design compression ratio, eliminating the under-crimp blow-off and over-crimp hose damage failures common with manual crimping methods.
• Hydrostatic Proof Test at 1200 PSI: Every assembly is pressure-tested at twice the maximum working pressure, verifying both the hose body integrity and the crimped connection seal before leaving the factory.
• Four-Layer Hose Construction: The HNBR tube, steel braid reinforcement, rubber cushion layer, and EPDM cover work synergistically to provide chemical resistance, pressure containment, abrasion protection, and thermal durability in a single optimized assembly.
• HNBR O-Ring Compatible Gland Design: Precision-machined O-ring glands accept standard HNBR O-rings used across all major OEM AC connection standards, simplifying field service and reducing parts inventory complexity.

The HP-4000 high-pressure discharge hose assembly is purpose-designed for the compressor discharge to condenser inlet circuit, the most thermally and mechanically demanding segment of any automotive AC system. This assembly handles refrigerant gas at compressor outlet temperatures that can reach 120 C to 150 C under severe operating conditions such as extended idle in hot ambient temperatures, stop-and-go traffic with limited ram air flow, and high-speed highway cruising with maximum cooling demand. Vehicle applications span the full spectrum of Asian, European, and American passenger car platforms from 2000 to 2025 model years, including Toyota Camry and RAV4, Honda Accord and CR-V, Nissan Pathfinder and Murano, Ford F-150 and Explorer, Chevrolet Silverado and Tahoe, and BMW 3-Series and 5-Series. Professional AC repair facilities, mobile diagnostic technicians, and fleet service centers will find this assembly to be a reliable replacement part for failed original equipment discharge hoses, with the steel fittings providing a noticeable upgrade in corrosion resistance over original aluminum or zinc alloy alternatives. Compressor remanufacturers and AC kit assemblers can specify custom fitting orientations, O-ring sizes, and hose lengths to match specific vehicle platform requirements. The 4000 PSI burst rating makes this hose particularly suitable for heavy-duty truck and off-highway equipment AC systems where vibration amplitudes and pressure pulsation magnitudes exceed passenger car norms.

Each HP-4000 discharge hose assembly is fitted with protective plastic end caps on both fitting ports to prevent thread damage and contamination ingress during transit. The assembly is coiled in its natural bend radius, secured with non-abrasive Velcro straps, and sealed in a heavy-gauge PE sleeve with desiccant pack. Individual units are packed in custom-fit corrugated boxes with die-cut foam end blocks that immobilize the assembly and prevent fitting-to-fitting contact. Master cartons use export-grade triple-wall corrugated construction with internal layer separators, designed for up to four-high stacking in standard 40-foot sea containers. Our ISO 9001:2015 certified quality system enforces 100% hydrostatic proof testing at 1200 PSI, 100% helium leak testing at the crimped connections, and statistical sampling for burst pressure verification per AQL 1.0 C=0. Full batch traceability is maintained from rubber compound lot number and steel fitting heat number through to final inspection records and shipping documentation. A 12-month warranty covers manufacturing defects in materials and workmanship. Our applications engineering team provides rapid fitment verification, custom configuration support, and technical troubleshooting for volume buyers. OEM and private-label packaging programs with custom branding are available upon qualification.