Hydraulic Union Adaptor, 3/8"MJ X 1/4" MJ

Hydraulic Union Adaptor, 3/8"MJ X 1/4" MJ

The 2403X0604 Hydraulic Union Adaptor is a straight hydraulic union fitting designed to connect two male 37° JIC flare hydraulic lines of different sizes—3/8" MJ to 1/4" MJ. Built from durable zinc-plated carbon steel, this adapter provides a reliable, leak-resistant connection for hydraulic systems while stepping down line size. Designed to meet SAE J514 specifications, it offers strong pressure capability and dependable performance in demanding hydraulic applications—because hydraulic oil belongs inside the hose, not decorating the shop floor.

Country of Origin
Varies by production batch

Key Features / Specifications

• Part Number: 2403X0604
• Product Type: Hydraulic union adaptor / straight reducer
• Connection Type: Male JIC x Male JIC (37° flare)
• End Size 1: 3/8" Male JIC — 9/16"-18 thread
• End Size 2: 1/4" Male JIC — 7/16"-20 thread
• Configuration: Straight union adapter
• Material: Zinc-plated carbon steel
• Standards: SAE J514 hydraulic fitting specification
• Working Pressure: Up to 6,000 PSI (typical rating depending on manufacturer)
• Burst Pressure: Up to 24,000 PSI (4:1 safety factor)
• Corrosion Protection: Clear zinc trivalent plating
• Typical Length: Approximately 1.40 in
• Hex Size: Approximately 5/8 in

Ideal For

• Connecting two hydraulic hoses or components with 37° JIC flare fittings
• Reducing line size from 3/8" hydraulic line to 1/4" line
• Hydraulic systems on tractors, loaders, and farm equipment
• Industrial hydraulic assemblies and hose builds
• Mechanics who appreciate fittings that seal properly the first time, saving them from playing hydraulic whack-a-mole with leaks later.