What is the thread pitch of the shift knob on a 2012 WRX?
The stock thread pitch for the 2012 WRX shift knob is M12 x 1.25. This metric size is the standard for the model’s manual gear lever, and it matters when you replace the knob or add aftermarket equipment.
Understanding the specification
In automotive terms, the thread pitch describes how tightly the knob threads onto the shift lever. For the 2012 WRX, the common and widely documented specification is M12 with a 1.25 mm pitch. This means the knob screws onto a 12 mm diameter shifter with threads spaced 1.25 mm apart. Using a knob that matches this pitch helps ensure a proper fit, secure engagement, and predictable torque when tightening.
How to verify on your vehicle
If you want to confirm the exact fit on your specific car, you can verify through a few practical checks. Remove the current shift knob and measure the diameter of the shifter’s threaded portion with calipers to see if it aligns with roughly 12 mm. To confirm the pitch, you can use a thread pitch gauge or count the number of threads per millimeter on the shifter’s threads. If you lack access to measuring tools, consult Subaru’s official parts diagrams for your VIN or contact a Subaru dealer to confirm the exact knob-thread specification for your car.
What to do if your knob doesn’t match
Most aftermarket shift knobs are designed to fit the standard M12 x 1.25 thread found on many Subaru models from that era. If you encounter a different pitch or diameter, you have a few options: use an adapter kit designed for the WRX’s shifter, seek a knob that matches M12 x 1.25, or have the stub on the knob or lever re-threaded by a qualified machinist. Always ensure the final installation is secure and torqued to the manufacturer’s specifications to avoid cross-threading or looseness.
Practical notes for replacements
When shopping for a new knob, check the product specifications for the thread size and pitch. If the knob is advertised for “Subaru WRX” or “GR/GE chassis,” it is likely to be compatible with M12 x 1.25, but it is prudent to double-check the exact pitch. Some owners opt for adapters to accommodate non-standard knobs, while others prefer direct-fit replacements that match the OEM spec to minimize fitment issues and maintain a factory feel.
Summary
The 2012 Subaru WRX shift knob typically uses an M12 x 1.25 thread pitch. For replacements or upgrades, verify the exact fit for your VIN, measure the shifter’s threads, or consult a dealer or parts diagram. If a knob with a different thread is chosen, an appropriate adapter or re-threading solution can ensure a secure, proper installation.
