Eaton 155S5-8D - Self-Sealing QD Half Coupling, -8

The Eaton Aeroquip 155S5-8D is a -8 size, Style I self-sealing quick-disconnect half coupling engineered for MIL-H-5606 and MIL-H-83282 red oil aircraft hydraulic systems. The hose attaching (female) half of the legendary Aeroquip 145/155 Series, the 155S5-8D delivers more than six decades of proven performance in aircraft hydraulic servicing, military ground support equipment, and MRO facility operations worldwide.

Product Overview

Rated to 3,000 PSI operating pressure and compliant with MIL-DTL-25427A, MIL-C-5502, and SAE AS5440, the 155S5-8D is the -8 tube size variant of the Style I flared hose attaching half — conforming to AS4395 — and is sized for 1/2" nominal hydraulic line applications. Its self-sealing poppet valve mechanism ensures zero fluid loss upon disconnection, preventing hydraulic fluid spills on the flightline and protecting internal sealing surfaces from contamination whenever the coupling is broken. The 155S5-8D ships with a dust cap included and is fully interchangeable with all fielded Eaton Aeroquip 145/155 Series couplings. Compatible replacement accessories include the 155S7-8D dust cap assembly and 155S9-8D dust plug assembly, available separately for in-service maintenance.

Key Features

• Style I flared hose attaching (female) half — AS4395 configuration for MIL-H-5606/MIL-H-83282 red oil systems
• -8 tube size (1/2" nominal) — ideal for medium-flow aircraft hydraulic circuit and GSE applications
• 3,000 PSI operating pressure rating per MIL-DTL-25427A
• Temperature range: -65°F to +275°F — qualifies for Type II hydraulic system use per SAE AS5440
• Self-sealing poppet design ensures zero fluid loss on disconnection — critical for flightline fluid control
• Thread: 0.750-16 — quick-lead blunt start threads connect/disconnect by hand with a simple turning motion
• Ratchet lock mechanism on union nut provides positive locking under vibration with automatic release on disconnection
• Ships with dust cap included ("D" suffix) — protects internal sealing surfaces during storage and ground handling
• Compatible dust cap: 155S7-8D | Compatible dust plug: 155S9-8D (both sold separately)
• Fully interchangeable with all fielded Eaton Aeroquip 145/155 Series couplings
• Meets MIL-C-5502 ground service quick-disconnect requirements
• Lightweight at 0.409 lbs (0.185 kg) — rugged aerospace-grade construction

Applications

• Aircraft hydraulic system ground servicing and fluid replenishment via hydraulic mule carts and service carts
• Military aviation maintenance units (AMUs, AMXSs) and flightline hydraulic servicing operations
• Hydraulic test stands and ground support equipment (GSE) requiring -8 size coupling connections
• MRO facility hydraulic circuit connections, component replacement, and bench test setups
• FBO and contract maintenance hydraulic service operations on U.S. military and civilian aircraft
• Depot-level maintenance (DLM) hydraulic plumbing and GSE reconditioning

Specifications

• Part Number: 155S5-8D
• Series: Aeroquip 145/155 Self-Sealing
• Style: Style I — Flared, Female/Hose Attaching Half
• Tube Size: -8 (1/2" Nominal)
• Fluid Compatibility: MIL-H-5606, MIL-H-83282 (Red Oil)
• Operating Pressure: 3,000 PSI
• Temperature Range: -65°F to +275°F (-54°C to +135°C)
• Thread: 0.750-16
• AS Standard: AS4395 (Female Half)
• Compliance: MIL-C-5502, SAE AS5440, MIL-DTL-25427A
• Dust Cap (Included): 155S7-8D configuration
• Compatible Dust Cap: 155S7-8D (replacement, sold separately)
• Compatible Dust Plug: 155S9-8D (sold separately)
• Weight: 0.409 lbs (0.185 kg)
• Manufacturer: Eaton Aerospace (Aeroquip Brand)
• CAGE Code: 00624