Parts for your 2006 Subaru Impreza-Wheel studs nuts

2006 Subaru Impreza wheel studs and nuts — what they do and how to look after them

Based on the Subaru 2006MY Impreza Factory Service Manual (Wheels and Tyres section) and the official Subaru parts catalogue, the 2006 Subaru Impreza is built with hub-mounted wheel studs (M12 x 1.25) and separate wheel nuts, not wheel bolts. The FSM specifies a wheel nut torque of 120 N·m (approximately 88–90 ft‑lb), applied to clean, dry threads. Non‑STI 2006 Impreza models generally use a 5×100 PCD, while the 2006 WRX STI uses 5×114.3 — all with studs and nuts. So wheel studs and nuts are absolutely relevant to this model.

On this Impreza, the studs are the fixed threaded pins pressed into the hub, and the wheel nuts clamp the wheel and brake rotor hat firmly to the hub face. Their job is straightforward but critical: provide consistent clamping force, keep the wheel centred on the hub, and handle the loads of braking, cornering, and rough Kiwi and Aussie roads without working loose.

During regular servicing, a quick once‑over of the wheel studs and nuts goes a long way. Nuts should run on smoothly by hand, the threads should be clean and sharp, and there shouldn’t be any rust blooms or metal flaking. Any stud that’s cross‑threaded, stretched (look for a slightly “necked” shank), or has damaged threads should be replaced — they’re a press‑fit into the hub and can be swapped with the hub on‑car in many cases, though access varies with brake setup. Likewise, replace wheel nuts that are rounded, swollen, or corroded.

Good practice for this Subaru includes:

• Always start nuts by hand to avoid cross‑threading, spin freely for several turns.
• Tighten in a star pattern and finish with a torque wrench to 120 N·m on dry threads.
• Avoid lubricants or anti‑seize on threads or seats unless a procedure specifically calls for it.
• Re‑torque after 50–100 km whenever wheels have been off.
• Match nut seat type to the wheel (most OEM and many aftermarket are 60° taper) and stick with M12 x 1.25 thread only.

If fitting new wheels or doing a brake job, this is the perfect time to check stud length, nut seating, and hub‑face cleanliness. A clean, flat mounting face and the correct torque are what keep this Impreza feeling tight and safe, lap after lap or commute after commute.

Popular questions about 2006 Subaru Impreza wheel studs and nuts

What’s the correct torque for the wheel nuts?
The 2006 Impreza service manual specifies 120 N·m (about 88–90 ft‑lb) on clean, dry threads. Using a torque wrench and tightening in a star pattern helps avoid rotor distortion and keeps clamping force even.

How can someone tell if a stud needs replacing?
Red flags include cross‑threading, visible thread gouging, a slightly “necked” look from stretch, or if a nut won’t run on smoothly by hand. Any stud that pulled a nut loose or was over‑torqued with a rattle gun is a candidate for replacement.

Are WRX and STI wheel studs the same on 2006 models?
Both use M12 x 1.25 studs and wheel nuts, but the STI runs a different hub/PCD (5×114.3). Stud dimensions and part references can differ between trims. When ordering, match by VIN or build/trim to ensure correct length and knurl size.