Mining

Liner Bolts & Large Diameter Hex Bolts – Essential Fastening Solutions for the Mining Industry

The mining industry is the backbone of modern civilization—supplying the raw materials that fuel construction, manufacturing, energy production, and technological innovation. From massive open-pit operations to deep underground shafts, every stage of mineral extraction relies on heavy-duty equipment built to endure extreme forces, abrasive materials, and harsh environments. At the core of this reliability are the fastening systems that hold these operations together.

The Role of Heavy-Duty Fasteners in Mining

Heavy-duty bolts and nuts are indispensable across mining operations. They secure crushers, conveyors, grinding mills, structural supports, and countless other components, ensuring machinery operates safely under continuous, high-load conditions. Made from high-strength carbon steel, alloy steel, or stainless steel, these fasteners are designed to resist shear, vibration, corrosion, and fatigue over long service cycles.

Liner Bolts – The Critical Connection Inside Grinding Mills

Within AG, SAG, ball, and rod mills, liner bolts are the vital fasteners that secure wear-resistant liners to the inner shell. As tons of ore or clinker are lifted and dropped for grinding, the liners shield the mill shell from impact and abrasion—but only if they are firmly anchored in place.

Liner bolt head designs are engineered to lock into liner recesses, preventing rotation during tightening and ensuring consistent seating. These bolts must be manufactured from high-strength materials like ASTM A354 Grade BD or ASTM A490 to withstand relentless impact, vibration, and corrosive slurry environments. A failed liner bolt isn’t just a bolt issue—it can lead to liner displacement, mill damage, and costly downtime.

Large Diameter Hex Bolts – Power for Structural and Equipment Assembly

Beyond mill liners, large diameter hex bolts are widely used throughout mining for securing structural frameworks, crusher housings, heavy-duty gearboxes, and conveyor systems. Their substantial size and tensile capacity make them ideal for applications where extreme clamping force is required to keep massive assemblies rigid under dynamic loading.

In critical operations—where machinery operates 24/7—large diameter hex bolts are often paired with heavy-duty nuts and hardened washers to maintain preload under vibration, thermal cycling, and shock loading. Selecting the correct material and coating is essential to resist corrosion in wet or chemically aggressive environments.

Coburn-Myers – Your Partner in Mining Reliability

For over 40 years, Coburn-Myers has been supplying the mining industry with custom-engineered fasteners built for the most demanding applications. Our complete line includes large-diameter hex bolts, liner bolts, high-strength nuts, and precision washers—all available in a range of grades, materials, and finishes to meet your operational needs.

Whether you’re replacing a single liner bolt or outfitting an entire crushing and grinding circuit, Coburn-Myers delivers not only the hardware but also the engineering insight to ensure your fasteners perform flawlessly in service.

Strong bolts build strong mines. Contact us today to discuss the right fastening solution for your mining operation.