Why Choose the Long Version?
The biggest advantage of FS6400-L is its extended length.
In some hydraulic installations, the connection point is recessed, positioned behind another component, or simply too far away for a standard adapter. The longer body gives the fitting additional reach while keeping the connection straight.
This can be useful when:
- More clearance is needed around a hydraulic port
- Components sit deeper inside equipment
- A standard adapter is too short
- You need additional space between connections
- Hydraulic lines need a longer inline transition
- Access around the connection is limited
The long configuration provides a practical solution without requiring an unnecessary elbow or additional adapter.
Male ORFS × Male ORB Connection
FS6400-L creates a direct transition between two hydraulic connection systems:
Male ORFS → Long Straight Body → Male ORB
The Male ORFS side uses an O-ring face seal, while the Male ORB side uses a straight O-ring boss thread.
This makes the adapter useful for hydraulic equipment that combines ORFS hose or tube connections with ORB ports on valves, manifolds, pumps and other hydraulic components.
ORFS O-Ring Face Seal
The ORFS end uses a flat-face sealing arrangement with an elastomeric O-ring.
ORFS connections are widely used in hydraulic systems where dependable leakage control is important. The flat-face seal is especially useful in systems exposed to vibration and pressure cycling.
Before installation, inspect the O-ring and sealing face for damage, contamination or incorrect positioning.
Male O-Ring Boss Connection
The opposite end is a Male ORB straight stud.
ORB connections use a straight thread with an O-ring positioned to seal against the port. When properly installed into a compatible ORB port, the O-ring provides the primary sealing interface.
This makes FS6400-L useful for connecting ORFS components directly into ORB ports without converting to tapered pipe threads.
Steel Construction for Demanding Hydraulic Systems
FS6400-L is available in steel, while comparable FS6400L specifications identify forged carbon steel construction with trivalent zinc plating.
The robust construction is suitable for hydraulic equipment exposed to:
- High operating pressure
- Continuous vibration
- Mechanical shock
- Pressure cycling
- Heavy equipment movement
- Industrial operating conditions
The protective zinc finish also provides additional corrosion resistance for demanding working environments.
High-Pressure Performance
Gear House Hydraulics lists FS6400-L for working pressures up to 6,000 PSI, depending on tube and fitting size, and specifically identifies it for applications containing continuous mechanical shock.
For systems operating at 5,000 PSI or above, the complete hydraulic assembly should be checked for compatibility, including the hose, tubing, fitting size, mating ports and seals.
Long Adapter for Better Port Access
FS6400-L can be particularly useful when a hydraulic port is difficult to reach.
The extended body can provide additional clearance between the equipment port and the connected ORFS assembly. This can make installation more practical when nearby components, brackets, guards or machine structures restrict access.
Instead of stacking multiple adapters to gain additional reach, the long straight configuration provides the required extension in a single fitting.
Where FS6400-L Is Used
FS6400-L ORFS to ORB long adapters are suitable for:
- Hydraulic manifolds
- Hydraulic valves
- Pumps
- Hydraulic cylinders
- Mobile equipment
- Construction machinery
- Agricultural equipment
- Industrial hydraulic systems
- OEM hydraulic assemblies
- Hydraulic hose connections
- Equipment repair and maintenance
They are especially useful when an ORFS connection must reach an ORB port positioned farther inside the equipment.
FS6400-L Features & Benefits
- Male ORFS × Male ORB
- Long straight configuration
- Extended adapter length
- ORFS O-ring face sealing
- ORB O-ring sealing
- Steel construction
- Forged design
- Trivalent zinc protective finish
- Working pressure up to 6,000 PSI, size dependent
- Suitable for continuous mechanical shock
- Multiple size combinations
- Useful for tight or recessed installations
- Helps eliminate unnecessary adapter stacking
FS6400 vs. FS6400-L
The key difference is the adapter length.
The standard FS6400 is used where a conventional straight adapter length is sufficient. The FS6400-L is the long version, designed when additional reach or clearance is required.
Choose FS6400-L when the connection point is recessed or when a standard adapter does not provide enough length for proper installation.
How to Select the Correct FS6400-L
Before ordering, verify the following:
ORFS Size:
Match the Male ORFS end with the correct Female ORFS connection.
ORB Size:
Confirm the Male ORB stud matches the hydraulic port.
Length:
Choose the long version when additional reach or clearance is required.
Configuration:
FS6400-L is a straight adapter and does not provide a directional change.
Pressure:
Confirm the selected size and complete hydraulic assembly meet the required working pressure.
Why Choose Gear House Hydraulics?
Gear House Hydraulics supplies FS6400-L long ORFS-to-ORB adapters for demanding hydraulic applications where standard adapter length may not provide the required reach.
The combination of Male ORFS sealing, Male ORB connection, extended straight design and steel construction makes FS6400-L a practical solution for recessed ports, limited-access installations and hydraulic assemblies requiring additional clearance.
Choose the correct size and configuration for your hydraulic system and verify the complete assembly before pressurizing.
Frequently Asked Questions
What is an FS6400-L fitting?
FS6400-L is a long straight hydraulic adapter connecting a Male ORFS connection to a Male O-Ring Boss (ORB) connection.
What is the difference between FS6400 and FS6400-L?
FS6400-L is the long version of the straight ORFS-to-ORB adapter. It provides additional length and reach where a standard adapter may be too short.
What does FS6400-L connect?
It connects a Female ORFS connection to a Female ORB hydraulic port.
What sealing systems does FS6400-L use?
The ORFS side uses an O-ring face seal, while the ORB side uses an O-ring boss seal.
What material is FS6400-L made from?
Gear House Hydraulics lists the collection as Steel. Comparable FS6400L specifications identify forged carbon steel construction with trivalent zinc plating.
What pressure can FS6400-L handle?
Gear House Hydraulics lists working pressures up to 6,000 PSI, depending on tube and fitting size.
Is FS6400-L suitable for high-pressure applications?
Yes. It is listed for high-pressure applications and applications involving continuous mechanical shock.
What sizes are available?
The collection includes configurations from 1/4" through 3/4", with equal and reducing combinations displayed on the Gear House Hydraulics page.
Why would I need a long ORFS-to-ORB adapter?
A long adapter is useful when the hydraulic port is recessed, when more clearance is needed, or when a standard-length fitting does not provide enough reach.
Is FS6400-L an elbow?
No. FS6400-L is a straight long adapter. It does not change the hydraulic line direction.
Can FS6400-L replace multiple adapters?
In some installations, yes. When additional reach is needed, the long design can eliminate the need to stack extra straight adapters, provided the fitting size and system requirements are correct.
What should I check before buying FS6400-L?
Confirm the ORFS size, ORB size, required adapter length, port compatibility, and pressure requirements before ordering.
