The HKS restrictor type turbocharger banjo bolt (1408-RA020) is a critical component for ensuring correct oil supply when installing or servicing Garrett-based ball bearing turbochargers. Designed specifically for use with small-to-medium frame Garrett turbochargers, this precision-engineered fitting helps regulate oil flow to maintain optimal lubrication and prevent over-oiling, which can compromise turbocharger performance and longevity.

This restrictor-style banjo bolt was originally supplied with HKS GT Series turbochargers—units that were manufactured by Garrett exclusively for HKS. As such, it maintains OEM-level compatibility and is an ideal replacement or upgrade when working with these turbo systems.

Particularly relevant for enthusiasts and professional tuners working with Nissan RB and SR engine platforms, this banjo bolt is considered an essential component when fitting Garrett-based ball bearing turbochargers. Proper oil control is crucial in these applications, especially given the increased demands placed on turbo systems in modified engines.

Key Features:

• Designed for Garrett small-to-medium frame ball bearing turbochargers featuring an SAE J512 7/16"-24 (0.4375"-24) inverted flare oil feed connection
• Restrictor-type design ensures correct oil flow and pressure
• Genuine HKS component, originally included with HKS GT Series turbos
• Ideal for Nissan RB and SR engine applications
• Helps protect turbocharger seals and bearings from excessive oil pressure

Important Note:

A restrictor-type oil feed bolt is generally not required if your setup utilises a turbocharger oil pressure regulator, such as the unit offered by Turbosmart. In these configurations, oil pressure is already controlled upstream, eliminating the need for an additional restriction at the turbocharger inlet.