Industrial conveyor systems require bearings that handle radial loads, moderate thrust, and variable speeds without frequent failure. The right deep groove ball bearing (DGBB) cuts downtime by 30% vs. mismatched parts, with key factors including load capacity, sealing type, and temperature rating. This guide walks through selecting the correct DGBB for conveyor applications to avoid premature wear.
Load Capacity Calculation for Conveyor DGBBs
To determine the required load capacity, start by measuring the total conveyor load: this includes the belt weight, material being transported, and idler roller mass. For a standard industrial conveyor, assume a belt load of 200kg per meter at a speed of 5m/s. Calculate the radial force per bearing using the formula F_r = (Total Load × 9.8) / Number of Bearings. For a 10-meter conveyor with 4 support bearings, F_r equals 2450N. Select a bearing with a dynamic load rating (C_r) at least 1.5 times this value to account for shock loads, so a 14kN C_r bearing like the MS Bearings 6205 series works perfectly. The 6205 model has an inner diameter of 25mm, outer diameter of 52mm, and width of 15mm, making it compatible with most standard conveyor idler shafts.Sealing Type Matching for Conveyor Environments
Seal selection depends on the operating environment, as dirt, moisture, and debris cause 60% of conveyor bearing failures. Two common seals are metal shields (ZZ) and rubber contact seals (2RS). ZZZ metal shields provide basic dust protection for dry, outdoor conveyor settings, while 2RS rubber seals offer better resistance to water and fine debris for wet or indoor applications. For food processing conveyors, choose MS Bearings 6205-2RS with FDA-compliant NBR seals to meet hygiene standards, preventing lubricant leaks that could contaminate products. Avoid mixed seals for extreme conditions; stick to one type per bearing to maintain consistent performance.Temperature and Speed Rating Adjustments
Conveyor bearings operate in temperatures ranging from -20°C (cold storage) to 120°C (near hot processing equipment). Select a bearing with a temperature rating matching your environment: standard grease-lubricated DGBBs work for -30°C to 120°C, while high-temperature variants handle up to 150°C. For speed, calculate idler RPM using (conveyor speed × 60) / (π × idler diameter). At 5m/s speed and 0.1m idler diameter, RPM equals ~955, which is well below the 12,000 RPM limit of the MS Bearings 6205 series. If your conveyor runs faster than 10m/s, upgrade to a 6305 series bearing for higher speed capacity.- Calculate total conveyor load (belt + material + idlers) to find required radial force
- Confirm bearing compatibility with shaft size (25mm for 6205 series)
- Match seal type to environment (ZZ for dry, 2RS for wet/dirty)
- Verify temperature and speed ratings fit your conveyor’s operating conditions
What is the most common DGBB for conveyor idlers?
The 6205 series is standard, with a dynamic load rating of 14kN, suitable for 200kg/m belt loads at 5m/s speed.
Should I choose ZZ or 2RS seals for outdoor conveyors?
ZZ metal shields are ideal for dry, dusty outdoor environments, while 2RS rubber seals work better in wet, dirty conditions.
For project-specific requirements, consult your bearing supplier or MS Bearings technical team. Contact MS Bearings for free technical support to confirm your DGBB selection for conveyor systems.
