Rack Ends

A Rack End must have sufficient tensile strength to withstand var

ious external forces. Great Auto Parts’ Rack Ends can withstand an average pull force of 4 to 8 tons, which exceeds the OEM standard of 3.5 tons. For

example, the tensile strength varies based on the ball head diameter and housing thickness. We set inspection standards according to different part specifications. For passenger cars, the average pull-out strength is 4 to 6 tons, while 8 tons is suitable for heavy commercial vehicles.

Here is a table of our Ball Stud Pull-out Test and Qualification conditions:

Ball Size (mm)	≤24	φ25	φ28	φ30	φ32	≥φ34
Pull-out Force (KN)	≥25	≥30	≥35	≥40	≥45	≥50
(kg.f)	≥2550	≥3060	≥3570	≥4080	≥4590	≥5100

GAP Test

The fit between the housing and the ball rod is critical. The smaller the

clearance after assembly, the lower the wear rate of the Rack End ball head

during operation, which in turn extends its durability. As a result, our Rack Ends have a clearance of only 0.06mm after withstanding a pull force of 460kg. Even under harsh conditions, our Rack Ends can maintain vehicle stability, and their excellent durability reduces the likelihood of steering gear failure due to a loose Rack End ball head.

Here is a table of our GAP testing conditions:

Ball Diameter	<25mm	25-34mm	>34mm	Unit
F1 (Force)	±2,500	±4,500	±6,000	N
SR (GAP)	0.15	0.20	0.25	mm

The connection points of the Rack End must meet specific torque requirements to ensure a solid and stable connection. Great Auto Parts specifies a qualified torque range, tested with a torque wrench, for our Rack Ends.

Here is a table of our Rotational Torque Test conditions:

Ball Size (mm)	≤24	25	28	30	32	≥34
Rotational (Nm)	0.6 – 5.0	0.8 – 7	1.0 – 7	1.0 – 8	1.0 – 9	2.0 – 13
(kgf.cm)	6.1 – 51	8.1 – 71	10 – 70	10 – 80	10 – 90	20 – 130

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Beyond Testing: Our Commitment to Safety and Innovation

In addition to rigorous testing, our Rack Ends are meticulously designed to meet the needs of automotive manufacturers and repair shops. Our Rack Ends feature heat-treated ball head bolts, which offer unparalleled strength. These bolts are designed to bend upon impact rather than break, ensuring a critical safety feature.

However, safety isn’t our only focus—innovation complements it. Our Rack Ends comply with stringent safety standards while simultaneously enhancing vehicle performance. Whether you are pursuing improved performance, safety, or environmental friendliness, our Rack Ends can help you achieve your goals.