What size thread is a Subaru 5mt shift knob?
The standard thread size for a Subaru 5-speed manual (5MT) shift knob is M12 x 1.25. In other words, a 12-millimeter diameter with a 1.25-millimeter pitch.
Across many Subaru models that used the 5MT transmission, both OEM and aftermarket knobs thread onto the lever using this metric specification. While this size covers the vast majority of Subarus from the late 1990s through the 2010s and into newer iterations, there are occasional variations due to model-year specifics, aftermarket adapters, or non-direct-thread designs that require a different fit. Always confirm with the exact vehicle year and trim if you plan a knob swap.
Understanding the implications for knob swaps
Knowing the thread size helps you pick a replacement knob or an adapter kit without trial-and-error fitting. If a knob does not thread on cleanly, you may be dealing with a non-M12 x 1.25 fit, or you might need a direct-thread adapter or a set-screw knob that clamps onto the lever.
How to verify your exact thread size
Before buying a new shift knob, verify the thread on your specific car using one of these methods:
- Use calipers to measure the outer diameter of the shifter thread and count the pitch with a thread gauge.
- Consult the vehicle’s service manual or parts diagrams for the exact knob-thread specification for your model-year.
- Ask a Subaru dealer or a reputable aftermarket parts retailer, providing your model, year, and transmission type to confirm compatibility.
Most aftermarket sellers label direct-thread knobs as M12 x 1.25 for Subarus with a 5MT, and adapters are available if your knob uses a different standard.
Common caveats and practical tips
Some trims or aftermarket arrangements may use non-threaded mounting, or a knob with a set-screw design that requires no direct threading. If you are upgrading, consider whether you want a direct-thread knob for the best fit, or a set-screw or adapter-based option that accommodates different thread standards.
Summary
In practical terms, most Subaru 5MT shift knobs are designed for an M12 x 1.25 thread (12 mm diameter, 1.25 mm pitch). This makes replacement straightforward for the vast majority of owners. Always verify your exact model-year and check for any adapters if your knob deviates from the standard.
