The method used to attach liner plates significantly affects cost and performance. Threading is the most expensive option, primarily useful for very thick materials. Conical countersinking is the most common choice today. This method hides the bolt head within the wear plate, protecting it from wear. For plates installed in critical areas, it is recommended to countersink deeply to prevent the bolt head from being exposed. Additionally, using higher strength class bolts, such as 10.9, provides better resistance to wear compared to 8.8 bolts. Recommendations for drilling and countersinking Hardox^® steel are available in the “Machining Hardox^®” brochure on the SSAB website. Alternative methods for countersinking include using advanced equipment such as 5-axle plasma, waterjet or laser machines. There are three types of countersunk holes: round conical, designed for hex bolts; round conical with a rectangular self-locking hole for added stability; and round conical with a wedge track, which helps lock the bolt securely. 

Stud welding is the most cost-efficient method, since it eliminates the need for drilling holes. Beyond cost savings, it offers the added benefit of maintaining a continuous surface against abrasives without any holes, which enhances wear resistance by minimizing points of weakness. However, stud welding has some drawbacks. During transport, stacking the liners can be challenging and there is a risk of thread damage if the studs are not protected. For applications exposed to dynamic loads, it is vital to achieve good welding quality of the studs to ensure highest possible fatigue resistance.

Different methods for bolting liner plates.