Parts for your 2015 Subaru Outback-Wheel studs nuts

2015 Subaru Outback wheel studs and nuts

Wheel studs and nuts are absolutely used on the 2015 Subaru Outback. The 2015 Subaru Outback Owner’s Manual (wheels and tyres section) specifies tightening the “wheel nuts” to 120 N·m (88.5 ft‑lb), and the factory Service Manual for the BS-series Outback details pressed-in wheel studs on the hubs. So they’re relevant to this model.

On a 2015 Outback, the wheel studs (typically M12 × 1.25 thread) and matching tapered wheel nuts clamp the wheel securely to the hub. Their whole job is to deliver consistent clamping force so the brake rotor stays true and the wheel runs without wobble. Subaru’s five-stud hub (5 × 114.3 mm pitch circle) relies on correct torque and clean, undamaged threads to do this safely every day, whether it’s the school run or a ski trip over the Kaimanawa Ranges.

For servicing, they’re a simple setup but worth a bit of care. Always start nuts by hand, then torque to 120 N·m in a star pattern on the ground. Keep threads dry—no oil or anti-seize—as Subaru’s guidance assumes dry threads and lubrication can result in over‑torque. After a tyre rotation or wheel-off job, recheck torque after 50–100 km.

• Inspect at each service for: damaged or cross‑threaded nuts, “necked” or stretched studs, heavy rust scaling, or spinning studs in the hub.
• Replace any suspect studs or nuts immediately. A single bad stud can concentrate load onto the rest and lead to failures.
• Match the nut seat to the wheel. OEM alloys use a 60° tapered (cone) seat closed‑end nut, the wrong seat style won’t clamp correctly.

Replacing a damaged stud is straight‑forward workshop work: the brake calliper and rotor come off, the old stud is pressed or driven out from the back, and a new stud is pulled in squarely. It’s wise to renew the matching nut, and if several studs show corrosion or stretching, do the set on that hub. Clean the hub face so the wheel sits flat, and never chase damaged threads with the nut—use a die or replace the stud.

With a bit of attention, the Outback’s studs and nuts last for years, keep tyres wearing evenly, and protect wheel bearings and brakes from vibration and heat.

• What’s the correct wheel nut torque for a 2015 Subaru Outback?
  It’s 120 N·m (88.5 ft‑lb) on clean, dry threads. Tighten in a star pattern and re‑torque after 50–100 km any time a wheel has been off.
• What size are the studs, and what’s the PCD?
  The factory studs are M12 × 1.25, and the Outback runs a 5 × 114.3 mm bolt pattern. Always confirm seat style and nut type to suit your wheels.
• Can anti‑seize or lubricant be used on wheel studs?
  Best not. Subaru torque specs assume dry threads. Lubrication changes friction, which can over‑stretch studs and reduce clamping force. If threads are rusty, clean them or replace the stud.