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For decades, KAMAX has been one of the leading international manufacturers of wheel studs for the truck and automotive industry. The most frequently used coatings for these fasteners are phosphate & oil and zinc flake coatings like Dacromet™ or Geomet™. The latter ones are used where increased corrosion protection is needed. Depending on the design of the wheel hub and customer specific requirements, various concepts are available.
The knurled wheel stud has a tried and proven design. It features a knurled shaft for both tolerance fit and protection against twisting during tightening. The knurled wheel stud is manufactured entirely by cold forming.
A press fit ensures that the stud is safely seated in the hub. The protection against twisting is achieved by a flat surface at the bolt head. The tight fitting tolerance (<20µm) on the stud shaft is produced by a grinding process.
The KAWEX™ wheel stud developed by KAMAX is a highly refined product, offering numerous advantages in assembly and function at a reduced price. KAWEX™ studs have decisive advantages over other wheel studs. In particular, the tolerance fit of customary ground wheel studs must be produced using expensive grinding processes. The KAWEX™ stud can be produced as a high volume production part entirely by cold forming at a favorable price. After the parts have been forged, a raw profile for the helical section is rolled into the shaft and then calibrated and processed to the required tolerance fit diameter (= 20 µm) using modern, precision rolling machines. The result is a smooth and work hardened surface for tolerance fit. The inlet geometry of the helical profile also makes it easier to press the bolt into the bore during assembly. Chamfering of the hub bore is not necessary due to an undercut, that occurs underneath the head while rolling the shaft section. Like ground wheel studs, KAWEX™ studs can be press fitted and removed a number of times without damaging the hub bore. Therefore it is not necessary to maintain special oversized parts for the service market, as it is the case with knurled studs. The tolerance fit surface area can be produced in such a way, that the seating pressure remains constant even after repeated press fittings and removals. The KAWEX™ stud can be used to good advantage in modern aluminium hubs. |
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KAMAX
wheel studs are manufactured in various geometrical designs, thread forms
and surface finishes for steel and light alloy wheels.