Radium 4AN ORB Swivel Banjo to 5/16in SAE Male

The Low-Profile Solution for Tight Fuel and Oil Plumbing Runs

The Radium 20-1000-04313 is a precision-machined 4AN ORB swivel banjo fitting that converts a standard -4AN O-ring Boss port to a 5/16 inch SAE quick connect male outlet. Built from stainless steel and anodized aluminum with a sealing FKM O-ring, the RAD20-1000-04313 is engineered for high-pressure fuel and oil system applications including fuel rails, surge tanks, regulators, and custom fuel plumbing. The swiveling banjo body rotates 360 degrees even after installation, making routing adjustments straightforward in confined engine bays.

Key Features

• 360-degree swivel rotation even after installation for precise line routing
• Low-profile banjo design at 0.797 in (20.2 mm) installed height
• Inlet: 4AN ORB (7/16-20 O-ring Boss thread)
• Outlet: 5/16 in SAE quick connect male
• Compatible with gasoline, ethanol (E85), methanol, and oil
• Maximum rated pressure: 400 psi
• FKM O-ring seal for chemical resistance and leak-free operation
• Stainless steel and anodized aluminum construction
• Sold individually

Specifications

What's Included

• 1x Radium 20-1000-04313 4AN ORB swivel banjo to 5/16 in SAE quick connect male fitting
• FKM O-ring (pre-installed)

Frequently Asked Questions

The inlet is a 4AN ORB (O-ring Boss) port with 7/16-20 threads. This is a standard thread pitch found on most Radium Engineering fuel rails, surge tanks, and regulators, as well as many aftermarket fuel system components.

The outlet is a 5/16 inch SAE quick connect male. This size is commonly used on OEM fuel injection hard lines in many domestic and import vehicles. To confirm fit, measure the outside diameter of your female quick connect receptacle; a 5/16 SAE male fits a 0.3125 inch OD female port.

Yes. The banjo body retains full 360-degree swivel capability even after the fitting is torqued into the ORB port. This allows you to adjust the hose routing direction without loosening the fitting, which is useful in tight engine bays with limited clearance.

This fitting is compatible with gasoline, ethanol blends including E85, methanol, and petroleum-based oil. The FKM O-ring seal provides excellent resistance to these fuels and resists swelling over time.

The RAD20-1000-04313 is rated for a maximum of 400 psi. This makes it suitable for both return-style and returnless high-pressure fuel injection systems, as well as oil system plumbing.

The installed height from the bottom seating surface to the top of the banjo body is 0.797 inches (20.2 mm). This compact profile is ideal for routing in tight spaces where taller fittings would contact surrounding components.

Yes. Radium Engineering recommends lubricating the O-ring with engine oil, dedicated O-ring lubricant, or petroleum jelly before threading the fitting into the ORB port. This prevents the O-ring from pinching or tearing during installation and ensures a proper seal.

Radium Engineering does not publish a specific torque figure for this fitting, but standard practice for 4AN ORB fittings is to snug hand-tight and then an additional quarter turn with a wrench. Do not overtighten, as excess torque can damage the O-ring or the port threads. Always check for leaks after installation.

No. The outlet is a 5/16 inch SAE quick connect male, which is designed to engage a matching female SAE quick connect receptacle such as those found on OEM hard fuel lines. It is not compatible with push-lock, barb, or compression-style hose ends on the outlet side.

Installation Instructions

1. Verify the ORB port is clean and free of debris or old O-ring material.
2. Inspect the pre-installed FKM O-ring for any damage; replace if necessary.
3. Lubricate the O-ring with engine oil, O-ring lubricant, or petroleum jelly.
4. Thread the 4AN ORB body into the port by hand until it seats flush.
5. Tighten with a wrench approximately one quarter turn past hand-tight; do not overtighten.
6. Rotate the banjo swivel to the desired hose routing angle.
7. Connect the 5/16 inch SAE female quick connect line to the male outlet until it audibly clicks and locks.
8. Pressurize the system and inspect all connections for leaks before returning the vehicle to service.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.