Click to zoom in
Precision Clutch Alignment for the Legendary RB26DETT
The OS Giken NS201-FB6 is a forged billet center alignment tool built specifically for the 26 tooth spline gearbox used behind the Nissan RB26/RB25 engine family. Every Nissan Skyline GT-R that left the factory with the iconic RB26DETT twin turbo inline six shares this same 26 spline input shaft pattern, and this tool is machined to match it exactly. Whether you are installing a new clutch disc, replacing a pressure plate, or servicing a transmission on an R32, R33, or R34 GT-R, the NS201-FB6 keeps the clutch disc centered on the pilot bearing and spline shaft so the transmission slides back into place without binding or misalignment. Chemically heat treated for long service life in professional shop environments, this alignment tool is a staple for any technician working on RB26 powered platforms.
Key Features
- Forged billet construction for durability across repeated clutch jobs
- Chemically heat treated finish resists wear in shop use
- Precision matched to the 26 spline gearbox used with the RB26/RB25 engine family
- Centers the clutch disc on the pilot bearing during installation
- Eliminates guesswork and reduces install time compared to improvised tools
- OS Giken NS201-FB6 part number laser marked for identification
- Compact design fits easily in a technician tool roll or shop drawer
- Reusable tool for shops servicing multiple RB26 equipped vehicles
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 1989-1994 | Nissan | Skyline GT-R (R32) |
| 1995-1998 | Nissan | Skyline GT-R (R33) |
| 1999-2002 | Nissan | Skyline GT-R (R34) |
Specifications
| Detail | Value |
|---|---|
| Brand | OS Giken |
| Part Number | NS201-FB6 |
| Tool Type | Center clutch alignment tool |
| Material | Forged billet, chemically heat treated |
| Spline Count | 26 tooth |
| Engine Compatibility | RB26 and RB25 with 26 spline gearbox |
| UPC | Not published by manufacturer |
| Country of Design | Japan |
What's Included
- 1x OS Giken NS201-FB6 center alignment tool
About OS Giken
OS Giken is a Japanese performance drivetrain manufacturer known for high end clutches, limited slip differentials, and precision service tools for import performance platforms. Their alignment tools are engineered to the same tolerances as their clutch kits, giving technicians a reliable way to install components correctly the first time on demanding engine platforms like the RB26DETT.
FAQ
What is the NS201-FB6?The NS201-FB6 is a forged billet center alignment tool from OS Giken designed for the 26 spline gearbox used with the Nissan RB26 and RB25 engine family. It centers a clutch disc during installation on RB26 powered Skyline GT-R models.
Which vehicles use this alignment tool?Any Nissan Skyline GT-R equipped with the RB26DETT engine and its 26 spline gearbox, covering the R32, R33, and R34 chassis.
Does this tool work on the RB25 engine too?Yes, OS Giken lists this part as compatible with both RB26 and RB25 applications that use the 26 spline gearbox pattern.
Is this tool a one time use item or reusable?This is a reusable shop tool built from forged billet material, intended for repeated use across multiple clutch installations.
Do I need this tool to install an aftermarket clutch on an RB26 platform?An alignment tool is strongly recommended for any clutch installation to keep the disc centered on the pilot bearing and prevent binding when mating the transmission to the engine.
What material is this alignment tool made from?It is manufactured from forged billet material and chemically heat treated for added durability in professional shop use.
Will this tool work with OEM Nissan clutches as well as OS Giken clutches?Yes, the tool matches the 26 spline gearbox pattern itself, so it works with OEM and aftermarket clutch discs sharing that spline count.
Is this alignment tool sold individually or as part of a kit?It is sold individually as a standalone alignment tool.
Install Instructions
- Remove the transmission and old clutch assembly per the vehicle service manual.
- Clean the flywheel surface and inspect the pilot bearing for wear.
- Position the new clutch disc against the flywheel with the OS Giken alignment tool inserted through the disc hub and into the pilot bearing.
- Center the disc using the tool and install the pressure plate, torquing bolts in a crisscross pattern to factory specification.
- Remove the alignment tool once the pressure plate is fully torqued.
- Reinstall the transmission, aligning the input shaft splines with the centered clutch disc.
- Reconnect all linkages, fluid lines, and the driveshaft before lowering the vehicle.
- Bleed the hydraulic clutch system if equipped and verify proper pedal engagement before road testing.
Prop 65 Warning
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
OS Giken
Shop OS Giken drivetrain parts, Super Lock LSD differentials, limited slip differentials, twin plate clutches, racing clutch kits, gear oil, differential covers, release sleeves, clutch alignment tools, and high-performance Japanese motorsport components at Black Ops Auto Works. OS Giken is known for precision-engineered drivetrain upgrades built in Japan for racing, track use, drifting, time attack, road racing, street performance, and high-horsepower applications. Whether you are upgrading a Nissan 350Z, 370Z, 240SX, Skyline RB26DETT, Toyota Supra, Toyota GT86, Scion FR-S, Mazda Miata, Mazda RX-7, Honda S2000, Honda Civic Type R, BMW M3, BMW M5, Porsche Cayman, Porsche Boxster, Ford 8.8 rear end, Mini Cooper S, or Datsun Z car, this OS Giken collection helps you find premium drivetrain parts designed for traction, durability, power transfer, and motorsport-level control. Shop OS Giken Parts by Category Browse OS Giken performance drivetrain upgrades across popular categories, incl...
View OS Giken Products