TPI Wheel Bolts (10pcs), Conical Seat, 17mm Hex, M14×1.25, 28mm, Black

TPI locking bolts are used to securely fasten your wheels. This package contains 10 bolts with an M14 × 1.25 thread and a length of 28mm. They have a 60° conical seat and a specific 17mm “flower” type head, which is tightened with a standard spanner. The bolts are made of heat-treated steel, and their surface is protected by black chrome, which increases their corrosion resistance.

Material and Testing for Reliability

The bolts are made from heat-treated steel of ASTM 4140 or SCM 440 grade, which are chromium and molybdenum alloys, or vanadium. This treatment ensures strength and resistance to mechanical stress. The surface is treated with a layer of black chrome, which not only gives the bolts a specific look but, above all, protects them from corrosion and external influences. Their reliability and lifespan are also confirmed by tests – the bolts have passed a salt spray test, which verifies their corrosion resistance, and a tensile test to check the material's strength.