Article Summary: Agricultural machinery operates in some of the most challenging mechanical environments, where mud, dust, moisture, vibration, impact loads, and long working cycles can place significant demands on rotating components. GW208PPB5 Square Bore Agricultural Bearings are designed for agricultural equipment requiring secure shaft engagement, dependable load support, effective contamination protection, and stable operation. With a 28.575 mm square bore, 80 mm outer diameter, heavy-duty housing, triple sealing system, wide-temperature lubrication, and agricultural-focused construction, this bearing configuration provides a practical solution for equipment such as disc harrows, cultivators, and seed drills. This guide explains its specifications, design advantages, applications, installation considerations, and purchasing factors.
Table of Contents
- What Are GW208PPB5 Square Bore Agricultural Bearings?
- What Are the Key Technical Specifications?
- Why Does the Square Bore Matter in Agricultural Machinery?
- What Performance Features Support Agricultural Applications?
- Where Can These Agricultural Bearings Be Used?
- How Should Buyers Select the Right Agricultural Bearing?
- How Should GW208PPB5 Bearings Be Installed and Maintained?
- Why Consider Demy for Agricultural Bearing Sourcing?
- Frequently Asked Questions
What Are GW208PPB5 Square Bore Agricultural Bearings?
For agricultural equipment manufacturers and maintenance teams, Demy provides GW208PPB5 Square Bore Agricultural Bearings designed around the practical requirements of demanding farm machinery. Unlike conventional round-bore arrangements, a square-bore bearing is designed to engage with a matching square shaft, creating a positive shaft-to-bearing connection for torque transmission.
This configuration is particularly useful in machinery exposed to vibration, impact, changing loads, soil contamination, water, and fertilizer residue. The GW208PPB5 model is listed with a 28.575 mm shaft size, making accurate shaft compatibility an important consideration during both original equipment design and replacement bearing procurement.
The bearing is associated with agricultural equipment such as disc harrows, cultivators, seed drills, and other rotating implements. Its design combines a robust housing, sealed bearing construction, lubrication provisions, and a square-bore interface intended for demanding field conditions.
For buyers comparing different agricultural bearing configurations, the GW208PPB5 product specifications provide a useful reference for checking dimensions and application requirements.
What Are the Key Technical Specifications?
Correct dimensional matching is essential when selecting a replacement or OEM agricultural bearing. A bearing should not be chosen solely according to its model number. Shaft size, outer diameter, width, load requirements, and mounting configuration should all be checked against the machinery design.
| Specification | GW208PPB5 | Importance for Buyers |
|---|---|---|
| Type | Square Bore Agricultural Bearing | Designed for agricultural shaft applications |
| Type Number | 1 | Identifies the bearing configuration |
| Shaft Size | 28.575 mm | Must match the corresponding square shaft |
| Dimension A | 29.972 mm | Useful for installation verification |
| Outer Diameter D | 80 mm | Important for housing compatibility |
| Be | 21 mm | Relevant to mounting geometry |
| Bi | 36.525 mm | Supports dimensional replacement checks |
| Dynamic Load Rating | 7,340 | Indicates dynamic load-carrying capability |
| Static Load Rating | 3,650 | Relevant to stationary and impact loading |
These values give engineers and purchasing teams a practical starting point for compatibility checks. Actual bearing selection should also consider equipment speed, load cycles, shaft condition, environmental exposure, installation tolerances, and the machinery manufacturer's specifications.
Why Does the Square Bore Matter in Agricultural Machinery?
Agricultural machinery frequently needs to transmit torque while operating under fluctuating loads. Soil resistance, uneven terrain, crop material, stones, and repeated starting and stopping can create mechanical conditions that are different from those found in many indoor industrial applications.
The square-bore design is intended to provide a direct mechanical interface with a compatible square shaft. This positive engagement can help reduce rotational slippage and support consistent torque transmission without relying on additional shaft adapters for the basic square connection.
- Direct shaft engagement: The square bore is designed to match a corresponding square shaft.
- Reduced slippage risk: Flat shaft surfaces provide a positive drive interface.
- Efficient torque transmission: The shaft and bearing interface is designed for agricultural drive applications.
- Practical replacement: Correct dimensional matching can simplify bearing selection and maintenance.
- Field-oriented construction: The design addresses common agricultural exposure to dirt, moisture, and vibration.
What Performance Features Support Agricultural Applications?
Reliable agricultural bearings require more than accurate dimensions. The surrounding environment can strongly influence service performance. GW208PPB5 is designed with several features intended to support operation in demanding field conditions.
Heavy-Duty Structural Design
The bearing uses a high-strength cast iron housing and hardened steel liner structure. This construction is intended to provide mechanical strength and resistance to impact and deformation during demanding equipment operation.
Triple Sealing Protection
Agricultural machinery can encounter mud, fertilizer, moisture, and airborne dust. The specified triple sealing system is designed to limit contamination entering the bearing while helping retain lubrication inside the bearing assembly.
Wide-Temperature Lubrication
The specified synthetic grease supports operation across a broad temperature range of -35°C to 130°C. Actual operating limits should always be evaluated together with the complete machinery system and service conditions.
Micro-Alignment Capability
The bearing design provides limited accommodation for shaft misalignment. This can help reduce the impact of small alignment deviations during operation, although proper shaft and housing alignment remains essential.
Anti-Corrosion Protection
Humid agricultural environments can accelerate corrosion on exposed mechanical components. Additional surface protection is intended to improve resistance to such conditions and support longer operating service.
Where Can These Agricultural Bearings Be Used?
GW208PPB5 is suited to rotating agricultural equipment where a square shaft connection and dependable bearing support are required. Common application areas include:
- Disc harrows and tillage equipment
- Cultivators and soil preparation machinery
- Seed drills and agricultural planting equipment
- Rotating shafts on agricultural implements
- Heavy-duty farm machinery exposed to vibration and contamination
- Replacement bearing applications for compatible agricultural equipment
For OEM applications, engineers should verify shaft dimensions, housing geometry, operating speed, load conditions, and environmental requirements before finalizing the bearing specification.
How Should Buyers Select the Right Agricultural Bearing?
Purchasing agricultural bearings requires a combination of dimensional verification and application analysis. A suitable bearing should fit the equipment mechanically while also meeting the expected operating conditions.
- Verify the shaft size: Confirm that the square shaft corresponds precisely with the bearing bore.
- Check the outer dimensions: Compare the 80 mm outer diameter and relevant width dimensions with the existing mounting arrangement.
- Evaluate loading: Consider both continuous operating loads and occasional shock loads.
- Review environmental exposure: Mud, dust, water, fertilizer, and temperature changes should be considered.
- Confirm lubrication requirements: Follow the bearing manufacturer's recommendations and the equipment service schedule.
- Check installation conditions: Shaft condition, alignment, tightening torque, and mounting cleanliness can affect bearing performance.
- Consider supply capability: For OEMs and distributors, production consistency, quality systems, inspection procedures, and technical support are important purchasing factors.
How Should GW208PPB5 Bearings Be Installed and Maintained?
Correct installation is essential for obtaining the expected performance from any agricultural bearing. Before installation, the shaft end and mounting surfaces should be clean and free from contaminants. The square bore should fit correctly onto the corresponding square shaft without forcing an incompatible component into position.
For the installation procedure specified by BMT, the bearing should be positioned securely against the square shaft and the lock nut tightened within the recommended 20–30 Nm torque range. The specified maximum allowable angular misalignment is ≤1°, while the listed temperature limit for operation is below 90°C.
Routine maintenance should include inspection for abnormal noise, vibration, excessive play, overheating, seal damage, and contamination. BMT recommends applying NLGI No. 2 grease every 250 operating hours. However, the actual service interval should be coordinated with equipment operating conditions and the original machinery maintenance schedule.
- Inspect the bearing and shaft during scheduled maintenance.
- Check for unusual noise or vibration during operation.
- Maintain the recommended lubrication schedule.
- Keep sealing surfaces clean and inspect them for damage.
- Store replacement bearings in a dry environment.
- Replace bearings when severe wear, overheating, abnormal play, or damage is detected.
Why Consider Demy for Agricultural Bearing Sourcing?
Demy (D&M) Bearings Co., Ltd. has more than 20 years of bearing manufacturing experience and supplies automotive, industrial, motorcycle, and agricultural bearing products. Its publicly stated manufacturing capabilities include automated grinding and assembly production lines, inspection and testing equipment, and quality management systems including ISO 9001 and IATF 16949.
For agricultural machinery manufacturers, distributors, and replacement-parts suppliers, these capabilities can support more consistent production and quality control. Demy's agricultural bearing portfolio also includes different bore configurations, allowing buyers to evaluate square-bore, round-bore, and other agricultural bearing solutions according to equipment requirements.
When sourcing from a China agricultural bearing manufacturer, buyers should look beyond unit price and evaluate dimensional consistency, quality management, inspection capability, production capacity, technical communication, packaging, and long-term supply stability.
Learn more about Demy's manufacturing capabilities and review the BMT agricultural bearing range to compare suitable configurations for different agricultural machinery applications.
Frequently Asked Questions
What is the shaft size of GW208PPB5 Square Bore Agricultural Bearings?
The listed shaft size is 28.575 mm. This dimension should be verified against the actual square shaft before purchasing or installing a replacement bearing.
What is the difference between GW208PPB5 and GW208PPB6?
The primary dimensional difference is the square bore size. GW208PPB5 is listed with a 28.575 mm shaft size, while GW208PPB6 is listed with a 25.4 mm shaft size. Both models have an 80 mm outer diameter and the same listed dynamic and static load ratings, making shaft compatibility an important selection factor.
Can GW208PPB5 be used in demanding agricultural environments?
Yes. The bearing is designed for agricultural applications and incorporates a triple sealing system intended to protect against contaminants such as mud, dust, moisture, and fertilizer. Actual service performance depends on correct installation, lubrication, operating conditions, and equipment design.
How often should GW208PPB5 bearings be lubricated?
BMT specifies NLGI No. 2 grease at 250-hour operating intervals. Buyers and maintenance teams should also consider actual load, speed, contamination, temperature, and the machinery manufacturer's maintenance requirements.
What should buyers verify before ordering GW208PPB5?
Buyers should verify the square shaft size, outer dimensions, mounting configuration, load requirements, operating environment, lubrication requirements, and compatibility with the target equipment. For OEM or bulk procurement, technical drawings and samples can also help confirm compatibility before mass production.
Conclusion
GW208PPB5 Square Bore Agricultural Bearings are designed for agricultural machinery that demands secure shaft engagement, reliable load support, contamination protection, and stable operation in challenging field environments. Its 28.575 mm square bore, 80 mm outer diameter, heavy-duty structural design, sealing system, and agricultural-oriented features make dimensional and application verification central to successful bearing selection.
For OEM manufacturers, agricultural machinery distributors, maintenance teams, and replacement-parts suppliers, choosing the right bearing can help create a more reliable and maintainable rotating system. If you are sourcing GW208PPB5 Square Bore Agricultural Bearings for agricultural machinery, evaluating bulk purchasing requirements, or looking for a reliable China bearing manufacturer, contact us to discuss product specifications, compatibility, samples, OEM requirements, and bulk supply solutions.
