Hartmann lug bolts are made in Italy to the highest standards and meet QS-9000 quality certification standards as well as ISO/TS 16949 and ISO 9001 TUV certification.
All Porsche vehicles as well as the Audi 4L chassis Q7 and VW Touareg use a 14mm diameter bolt with a 1.5 thread pitch. OEM wheels use a R14 ball seat bolt, aftermarket wheels typically use a cone seat bolt however some use a ball seat.
Hartmann Lug Bolt Specifications:
Shaft Diameter: 14mm
Bolt Head: 19mm Hex
Thread Pitch: 1.50
Seat Type: Floating R14 (14mm radius) Ball
Hartmann Lug Bolt Manufacturing: Hartmann bolts are constructed from high grade steel and are nickel plated for corrosion resistance.
Determining Lug Bolt Length for Spacers:
Remove one lug bolt and measure the length from the end of the threads to the bottom of the seat, add the spacer thickness to the bolt length. (Stock length + spacer thickness = new bolt length)
Hartmann Lug Bolt Install:
Confirm the lugs are the proper length by threading a single bolt in by hand and counting the rotations until seated, you should get 7 rotations. Once seated rotate the wheel slowly to ensure the lug is not contacting any components on the inside of the hub.
Install wheels in the air, using the brakes to stop the wheel from turning and torque the lugs to the vehicle manufacturers specified value first in a star pattern, followed by a circle.
Re-torque the lugs after 1 week on brand new wheels.