Conveyor Roller Core Accessories – Bearing Housing, Seal, Shaft & Circlip Guide

conveyor roller accessories are composed of five core components: bearing housings, bearings, seals, shafts, and circlips. Each component directly impacts roller service life and belt conveyor reliability. As a professional bulk material handling solution provider, ZOOMRY manufactures complete conveyor rollers and idlers for mining, cement, and port applications. This guide explains each roller component in detail and how to select quality accessories for maximum service life.

1. Roller Bearing Housing – Stamping vs Cast Iron

There are two types of idler bearing housings:

Housing Type	Manufacturing Method	Characteristics
Stamping Bearing Housing	Welded with steel pipes	Good sealing, strong overall bearing capacity — preferred for heavy-duty applications
Cast Iron Bearing Housing	Extruded with steel pipes	High concentricity but lower bearing capacity than stamping — suitable for lighter-duty applications

2. Roller Bearings – The Most Critical Component

Bearings are the most important part of rollers — their quality directly determines roller service life. Common bearing types include 6204, 6205, 6305, 6306, 6307, 6308, and 6309, selected based on roller diameter and belt width. For a complete compatibility chart, refer to our roller diameter and bearing selection guide. ZOOMRY uses precision-grade bearings with rotation resistance ≤2N and 50,000+ hour service life.

3. Roller Seals – Material and Type Selection

Roller seal materials are divided into two types:

Seal Material	Cost	Wear Resistance	Best For
Polyethylene	Low	Moderate	Standard applications, dry environments, budget-sensitive projects
Nylon	Higher	High	Heavy-duty, abrasive, and wet environments — longer service life

Roller seals are also classified by roller type into nearly ten standard designs: TD75, DTII, TR, TK, QD80, SPJ, and others. Each seal type is engineered to match specific roller dimensions and operating conditions. ZOOMRY's HDPE rollers combine nylon seals with corrosion-resistant roller bodies for extreme environments.

4. Roller Shaft – Tolerance is Critical

Roller shafts are divided into cold-drawn steel shafts and stepped shafts. The shaft tolerance must be maintained between +0.002 mm and +0.019 mm — any deviation outside this range causes bearing misalignment, increased rotation resistance, and premature failure. ZOOMRY uses precision-ground shafts with strict quality control to ensure consistent fit with bearings and seals.

5. Circlip – Axial Fixing and Retention

The circlip (retaining ring) is made of spring steel and prevents axial movement of the roller assembly. Inferior spring steel circlips have poor elasticity and can deform under external forces — failing to restrain roller movement and leading to belt mistracking. ZOOMRY uses high-quality spring steel circlips that maintain consistent retention force throughout the roller's service life. The fixing of parts on the shaft is divided into axial fixing and circumferential fixing — both are essential for stable roller operation.