Hydraulic Male Adaptor, 3/8"MJ X 1/4"MB

Hydraulic Male Adaptor, 3/8"MJ X 1/4"MB

The 6400X0604 Hydraulic Male Adaptor is a straight hydraulic fitting designed to connect a 3/8" male JIC flare fitting to a 1/4" male SAE O-ring boss (ORB) port, providing a dependable transition between common hydraulic connection styles. Constructed from durable carbon steel and rated for up to 5,000 PSI, this adaptor delivers strong, leak-resistant performance in demanding hydraulic systems. It’s a simple but critical component that helps different hydraulic standards play nicely together—because a well-chosen adaptor can prevent a lot of head-scratching in the shop.

Country of Origin
Varies by production batch

Key Features / Specifications

• Model / Part Number: 6400X0604
• Product Type: Hydraulic male adaptor fitting
• Fitting Shape: Straight
• End 1 Type: Male JIC
• End 1 Size: JIC 6 — 9/16"-18 (37° flare)
• End 2 Type: Male SAE O-Ring Boss (ORB)
• End 2 Size: SAE 4 — 7/16"-20 ORB
• Connection Size Description: 3/8" MJ × 1/4" MB
• Material: Carbon steel
• Working Pressure: Up to 5,000 PSI
• Design Purpose: Connects JIC flare fittings to SAE ORB hydraulic ports
• Construction Benefit: Steel body provides strength and durability in high-pressure systems

Ideal For

• Hydraulic systems requiring JIC to SAE ORB connections
• Agricultural, construction, and industrial equipment repairs
• Hydraulic line installations and component adaptations
• High-pressure systems needing durable steel fittings
• Installations where the right adaptor keeps hydraulic lines working together instead of arguing about thread standards