Between the nut and the swivel box, which washer acts as a thrust bearing?

Between the nut and the swivel box, which washer acts as a thrust bearing?

• A. Phosphorous Bronze Washer
• B. Brass Washer
• C. Steel Washer
• D. Nylon Washer

Answer: (A)

A washer that serves as a thrust bearing must carry axial load between two moving parts while providing a smooth, low-friction sliding surface. Phosphorous bronze fits best because it offers a hard, wear-resistant bearing surface with low friction against steel, plus good corrosion resistance in marine environments. It resists galling and maintains a smooth surface under load, making it durable for the sliding contact between the nut and the swivel box. Brass is softer and wears faster under load, steel, while strong, can gall or seize against steel surfaces, and nylon, though low-friction, can creep or degrade under axial thrust and in marine conditions. So the phosphorous bronze washer is the most suitable thrust-bearing choice here.

A washer that serves as a thrust bearing must carry axial load between two moving parts while providing a smooth, low-friction sliding surface. Phosphorous bronze fits best because it offers a hard, wear-resistant bearing surface with low friction against steel, plus good corrosion resistance in marine environments. It resists galling and maintains a smooth surface under load, making it durable for the sliding contact between the nut and the swivel box. Brass is softer and wears faster under load, steel, while strong, can gall or seize against steel surfaces, and nylon, though low-friction, can creep or degrade under axial thrust and in marine conditions. So the phosphorous bronze washer is the most suitable thrust-bearing choice here.