1. The roller tube wall thickness: The roller tube wall thickness of 800 belt idler is usually made of seamless steel tube, its tube thickness is determined according to the design requirements, commonly 5-6mm.

2. The outer diameter of the roller: The outer diameter of 800 belt idler is usually 89mm or 108mm. The specific outer size should be selected according to the engineering design requirements and the actual use situation.

3. Roller width: The effective wide of 800 belt idler is generally 800mm. This refers to the distance between the roller tube and the roller end cover, also it is the required width for the belt to operate normally.

4. The length of the roller shaft: 800 belt idler shaft is commonly consisted of carbon steel or stainless steel, its length depends on the outer diameter of the roller and the installation method. In a generally speaking, the length of the roller shaft will be longer than the effective width of the roller idler by 50-100mm.

5. The thickness of the roller end cover: The end cover of the 800 belt idler is usually made of carbon steel or the polyurethane material, its thickness usually 4-6mm.

6. The diameter of the roller bearing hole: The diameter of 800 belt idler bearing hole is commonly 20mm or 25mm. It is hole size for installing roller bearing.

7. Roller weight: Weight of 800 belt idler is relevant to its size, material, usually between 10- 20kg. The specific weight need to be determined according to the roller specification and the materials.

8. In a summary, the detailed dimensions of 800 belt roller include roller tube wall thickness, outer diameter of roller, roller width, length of roller shaft, roller cover end thickness, diameter of roller bearing hole and the roller weight. When, selecting and using the 800 belt roller, need to choose the appropriate size according to the engineering design requirements and the actual using situation, ensure the quality and the performance of the roller that meet the relevant standard and regulations.