Wheel bolt for original Fiat, Opel, Alfa Romeo and Lancia wheels M12x1.25 conical seat / 17 mm hex – 22 mm

M12x1.25 wheel bolt / conical seat / 22 mm / 17 mm hex / Geomet – Carbonado

For original Fiat, Opel, Alfa Romeo and Lancia wheels

The bolt is designed for mounting original alloy and steel wheels on selected models including Fiat, Opel, Alfa Romeo and Lancia that use bolts with an M12x1.25 thread and a conical seat.

It has a threaded length of 22 mm, and the bolt head is designed for a 17 mm wrench.

Before purchase, make sure that the bolt specifications match the requirements of the specific vehicle and wheel model, in particular:

• M12x1.25 thread,
• thread length 22 mm,
• conical seat,
• wrench size 17 mm.

Conical seat

The bolt has a conical seat designed for wheels with a correspondingly shaped bolt seat.

The shape of the seating surface is an important mounting parameter – a conical-seat bolt should not be replaced with a ball-seat bolt or a bolt with any other seat type.

Geomet coating

The bolt surface is protected with a Geomet coating used to protect steel fasteners. It is a zinc- and aluminium-flake-based coating that forms a thin, uniform protective layer.

The bright, silver-colored finish complements original alloy and steel wheels.

Property class 10.9

The bolt has a property class of 10.9, suitable for connections requiring high mechanical strength. The 10.9 marking is stamped on the bolt head.

The mechanical properties of the bolt ensure adequate connection strength when the wheel is installed correctly.

Correct wheel mounting

During installation, use the tightening torque specified by the vehicle or wheel manufacturer.

For final tightening, the use of a torque wrench is recommended. It allows the correct torque to be applied and reduces the risk of both insufficient and excessive tightening of the bolt.

Carbonado – wheel mounting accessories

The bolt belongs to the Carbonado range of accessories, which includes wheel bolts and nuts, wheel security products and hub centric rings.

Carbonado products are designed for wheel installation and accessories, with an emphasis on manufacturing precision and correct matching of technical specifications.