Parts for your 2009 Subaru Outback-Wheel studs nuts

2009 Subaru Outback wheel studs and nuts

Based on the Subaru Factory Service Manual for 2005–2009 Outback/Legacy (Wheels and Tyres section) and the Subaru Genuine Parts catalogue, the 2009 Subaru Outback uses hub-mounted wheel studs with separate wheel nuts (M12 x 1.25 thread, five per wheel, 5x100 PCD). It does not use wheel bolts. That means wheel studs and nuts are directly relevant to this model.

On the 2009 Outback, wheel studs and nuts provide the clamping force that keeps the wheel tight against the hub and brake rotor hat. When torqued correctly, they maintain even clamp load, protect the wheel bearing, and help prevent brake rotor distortion. Subaru specifies tightening the wheel nuts to 120 N·m (about 88.5 ft·lb), using a star pattern. Final tightening should be with a torque wrench—not a rattle gun—and it’s smart to re-check torque after 50–100 km, especially after a wheel or tyre service.

Studs are a press-in design, if one gets stretched, cross-threaded, or shears, it should be replaced. Replacements must match the original spec: M12 x 1.25 thread, correct knurl diameter and length. The nuts are 60-degree tapered-seat type to suit the factory alloys/steels, using the wrong seat style can loosen the wheel. The FSM advises keeping threads clean and dry—no oil or anti-seize on the threads or seats—as lubrication can over-tension the stud at the specified torque.

When replacing a stud, the brake caliper and rotor are removed for access. Many techs can draw a new stud into the hub with a sacrificial nut and spacers, but pressing is kinder to the hub and bearing. If a stud spins in the hub, the knurl bore may be worn and the hub could need replacement. Over-torquing can stretch studs and warp rotors, under-torquing risks wheel movement and damage.

• Inspect at each tyre rotation or brake service: look for damaged or rusty threads, swollen caps on aftermarket nuts, or any missing studs.
• Replace any nut that doesn’t run on by hand, don’t force it with a gun.
• Tighten in a star pattern to 120 N·m, and re-check after a short drive.

Look after the studs and nuts and the Outback’s wheels will stay safely planted, the brakes will stay happier, and roadside dramas stay at bay.

Popular questions about 2009 Subaru Outback wheel studs and nuts

What’s the correct wheel nut torque for a 2009 Subaru Outback?

Subaru specifies 120 N·m (about 88.5 ft·lb). Tighten in a star pattern with a torque wrench on clean, dry threads and seats. Avoid using a rattle gun for final torque and re-check after 50–100 km following any wheel-off work.

What size are the studs and what’s the bolt pattern?

The 2009 Outback (BP/BL) in Australia and New Zealand uses five M12 x 1.25 studs per hub with a 5x100 PCD. The nuts use a 60-degree tapered seat to match OEM wheels.

Can wheel studs be replaced without removing the hub?

Often yes. With the caliper and rotor off, there’s usually enough clearance to draw a new stud in from behind. Some positions may be tight and safer with the hub removed and a press. If a stud spins in the hub, the hub may need replacing.