Stainless Steel Restricted Single Banjo Bolts

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Copper Crush Washers +£0.44

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Stainless Steel Single Restricted Banjo Bolts – Precision Oil Flow Control for Turbochargers

Managing oil flow is critical for turbocharger performance and longevity. Our precision-engineered stainless steel restricted banjo bolts help regulate oil pressure, preventing excessive flow that can lead to turbo seal leaks and smoke issues. Manufactured in the United Kingdom from high-grade stainless steel, these banjo bolts offer superior durability, corrosion resistance, and a precision fit for high-performance applications.

Why Choose Our Stainless Steel Restricted Banjo Bolts?

Optimised Oil Flow

Each banjo bolt features a 1.5mm internal restriction to regulate oil pressure, reducing the risk of turbo seal leaks and excessive smoke.
Durable & Corrosion-Resistant

Machined from high-quality stainless steel, these bolts offer exceptional corrosion resistance, making them ideal for long-term use in turbo oil feeds.
Essential for Turbo Upgrades

Especially useful when switching from a journal-bearing turbo to a ball-bearing turbo, which requires lower oil flow.
Precision Fit for High-Performance Applications

CNC-machined threads ensure a secure, leak-free connection for turbo oil feeds in motorsport, automotive, and industrial applications.
Available in Multiple Sizes

Choose the correct thread size for your setup:
- M10 x 1.5 (1.5mm restriction)
- M12 x 1.5 (1.5mm restriction)
- 7/16"-24 UNF (1.5mm restriction)

What is a Restricted Banjo Bolt?

A restricted banjo bolt is designed to limit oil flow to sensitive components like turbochargers, preventing excess pressure that can force oil past seals and into the exhaust. This is particularly beneficial for ball-bearing turbos, which require lower oil volume compared to journal-bearing turbos.

Installation

To ensure a proper seal, you will need two copper crush washers per banjo bolt (not included). These washers help create a tight, leak-free connection between the banjo bolt, banjo fitting, and component.

Engineered for Performance, Trusted by Experts

From high-performance turbocharged engines to motorsport applications, our stainless steel restricted banjo bolts provide the precise oil flow control needed for reliability and efficiency. Upgrade today for optimised turbo performance and long-lasting durability.

Bolt Type: Single Banjo Bolt Designed for use with a single banjo fitting
Head Type: Hex Head Standard spanner installation
Material: 303/304 Stainless Steel Excellent strength and durability
Finish: Natural Stainless Steel Corrosion-resistant
Manufactured In: United Kingdom Precision CNC machined

Flow Design: Restricted Limits fluid flow through the bolt
Restriction Size: 1.5mm Internal flow restriction
Seal Type: Crush Washers Two required for installation

Available stainless steel restricted single banjo bolt sizes and dimensions
Product Code	Thread	Restriction	Thread Length	Bolt Length Below Hex Head	Spanner Size
BLT-SGL-RES-SS-M10X15-15	M10 x 1.50	1.5mm	11mm	20mm	14mm
BLT-SGL-RES-SS-M12X15-15	M12 x 1.50	1.5mm	14mm	23mm	16mm
BLT-SGL-RES-SS-716X24-15	7/16"-24	1.5mm	9mm	18mm	14mm

Turbo Oil Feeds
Oil Feed Systems
Performance Engines
Motorsport Applications
Hydraulic Oil Systems

Engine Oil
Lubricating Oil
Hydraulic Oil

Copper Crush Washers

Two crush washers are required for installation, one either side of the banjo fitting.

Free repair or replacement for two years from the date of purchase. Learn more

Frequently Asked Questions

What is a stainless steel single restricted banjo bolt?
A stainless steel single restricted banjo bolt is a specialised fastener designed to connect a banjo fitting to a component while regulating fluid flow. The built-in restriction helps control oil pressure, making it ideal for applications like turbocharger oil feeds where precise oil flow is crucial.
Why would I need a restricted banjo bolt for my turbocharger?
Turbochargers, especially ball-bearing types, require controlled oil flow to prevent seal leaks and excessive smoke. A restricted banjo bolt limits the oil flow to the turbo, ensuring optimal lubrication without over-pressurising the seals.
What sizes are available for these restricted banjo bolts?
We offer the following thread sizes, each with a 1.5mm internal restriction:
- M10 x 1.5
- M12 x 1.5
- 7/16"-24 UNF
This range ensures compatibility with various turbo oil feed setups.
Are these banjo bolts compatible with your custom braided hoses?
Yes, our stainless steel single restricted banjo bolts are fully compatible with our range of custom braided hoses, including those used for turbo oil feeds. They ensure a secure, leak-free connection in high-performance applications.
Do I need additional components for installation?
For a proper seal, we recommend using two copper crush washers (not included) with each banjo bolt—one on each side of the banjo fitting. These washers help create a tight, leak-free connection between the banjo bolt, banjo fitting, and component.