12MM X 1.25 1.38IN SPLINE NUT

12 mm x 1.25 Closed End Passenger Spline Acorn Nut. 1.38" Length. This professional grade closed end passenger spline acorn nut is specifically engineered for secure wheel mounting and long term performance. Manufactured from durable Q235 steel, each fastener measures 1.38" (35 mm) in total length and features a precision 6-tooth spline drive pattern for enhanced theft deterrence. The design includes a precision machined 60-degree conical seat to ensure maximum contact area and uniform pressure distribution against the wheel hub, with a strict coaxial tolerance of less than 0.2 mm between the tapered seat and internal threads. The exterior is treated with a high quality chroming surface treatment to provide exceptional resistance against rust and environmental corrosion. For precise technician reference, the nut features permanent external markings indicating the 12 x 1.25 thread specification in 2.5 mm tall lettering. This component is expertly designed with a 20 mm flange outer diameter to ensure optimal compatibility and fitment stability for high-torque automotive applications.