NLHB (Ningbo Shuanghua Bearing Co., Ltd.) manufactures agricultural ball bearings and ball bearing assemblies in both industry-standard and custom-designed configurations. Our agricultural bearing range covers disc harrow bearings, flanged disc bearings, and agricultural specials including round, square bore and hex bore designs, available in both inch and metric sizes.
Why Choose NLHB Agricultural Bearings?
Every NLHB agricultural bearing is engineered to deliver optimum performance in the harsh, contaminated environments typical of farm machinery. Key engineering features include:
- Seals: Specialized nitrile seal material bonded to heavy-gauge steel shrouds provides superior protection against abrasive dust, mud, and corrosive contaminants.
- Steel: High-cleanliness, through-hardened bearing steel is heat treated and precision machined for increased accuracy and long service life.
- Grease: Premium polyurea-thickened grease offers corrosion resistance and extended relubrication intervals.
- Housings: Full line of housing styles including standard housings, flange disc units and trunnions, in ductile iron and cast iron.
- HUB units: HUB bearing units designed specifically for tillage applications.
- Drop-in replacement: Pre-assembled bearing-and-housing offerings enable quick drop-in installation and field replacement.
Technical Specifications
NLHB agricultural bearings are produced to the following standard product offering. Custom configurations are available on request.
- Bore Size: 12mm and larger in round, square and hex bore designs
- Outer Diameter: up to 160mm
- Closures: Single lip, double lip, triple lip
- Ring Material: 52100 chrome steel (SAE52100 / ISO 100Cr6 / GB/T GCr15)
- Seal Material: Elevated-temperature formula NBR (Nitrile; Polyacrylate and FKM also available)
- Retainer (Cage): Riveted steel, glass-filled and non-glass-filled polymer
- Precision Class: ABEC1 (ABEC3 and ABEC5 available for precision series)
- Radial Internal Clearance: C3, C4 (C2, C0 and C5 available for precision series)
- Heat Stabilization: S0, S1, S2, S3 (precision series)
For precision deep groove and angular contact versions, the extended product offering covers:
- Bore Size: 2mm – 150mm
- Outer Diameter: 15mm – 150mm
- Closures: Open, non-contact metallic shields, non-contact seals, contact seals
- Ring Material: SAE52100 (ISO 100Cr6, GB/T GCr15)
- Seal Material: Nitrile, Polyacrylate, FKM
- Retainer: Riveted steel, crimped steel, crowned steel, crowned nylon
- Precision Class: ABEC1, ABEC3, ABEC5
- Radial Internal Clearance: C2, C0, C3, C4, C5
- Heat Stabilization: S0, S1, S2, S3
Standard Bearing Series Available
- Single Row Deep Groove Ball Bearings: R Series (inch), 1600 Series (inch), 600 Series, 6800 Series, 6900 Series, 6000 Series, 16000 Series, 6200 Series, 6300 Series, 6400 Series
- Cartridge Series: W6200 / W6300 (U.S.), 62200 / 62300 (Europe), 63000
- Double Row Angular Contact Ball Bearings: 5200 Series, 5300 Series, W5200 Series, W5300 Series
Featured Agricultural Part Numbers
- 203KRR2 – insert bearing with extended inner ring, single lip seal
- 203KRR2R3 – 203KRR2 with triple-lip seal upgrade
- 203KRR5 – heavy-duty wide-inner-ring agricultural insert
- 6203 2RST – sealed deep groove ball bearing
- 6205 2RST – sealed deep groove ball bearing
- Z9504 – agricultural disc harrow bearing
- 99502H-2RST – wide-inner-ring insert bearing
- B9600378 / B9600410 – agricultural HUB bearing units
How to Choose the Right Agricultural Bearing
- Match the bore to the shaft: Confirm round, square or hex bore and the exact shaft size. Hex and square bores are common on disc harrows and tillers where high torque is transmitted.
- Select the right seal for the environment: Single-lip seals suit general-purpose loads; double- and triple-lip seals are recommended for high-contamination conditions such as mud, dust and crop residue.
- Pick the correct housing: Choose standard pillow blocks, flange disc units or trunnions based on the mounting arrangement of the implement.
- Check load and speed: Verify radial and axial load ratings against the application. HUB units are preferred for tillage applications that see heavy radial and impact loads.
- Specify clearance and precision: C3 or C4 internal clearance is standard for agricultural applications to accommodate thermal expansion; ABEC1 precision is typical for cost-effective field use.
Typical Applications
NLHB agricultural bearings are widely used in farm and agricultural machinery, including:
- Disc harrows and disc ploughs
- Rotary tillers and cultivators
- Seeders and planters
- Combine harvesters, balers and forage equipment
- Tractors, agricultural HUB assemblies and implements
- Conveyors and material-handling attachments on farm equipment
Cross-Reference and Interchangeability
NLHB agricultural insert bearings follow widely used industry part-number conventions and are dimensionally interchangeable with equivalents from major global suppliers such as SKF, NSK, NTN, FAG, INA and Timken. For example, the 203KRR-style wide-inner-ring insert, 6203 / 6205 sealed deep groove bearings, and the 99502H wide-inner-ring insert map to corresponding insert and ball-bearing part numbers from these brands. To guarantee a correct drop-in replacement, always confirm the bore size, outer diameter, width, seal type and bore shape (round / square / hex) before substituting. Contact NLHB with your current part number and we will confirm the matching NLHB equivalent.
Installation and Maintenance Tips
- Clean the shaft and housing bore thoroughly before mounting; debris is the leading cause of premature agricultural bearing failure.
- For pre-assembled bearing-and-housing units, use the drop-in design and torque mounting hardware to the implement manufacturer’s specification.
- Avoid applying force to the seals during installation; press on the ring taking the interference fit only.
- Relubricate at intervals appropriate to the seal type and operating conditions; premium polyurea grease is recommended for NLHB sealed units.
- Inspect seals regularly during the season — replace bearings immediately if a seal is damaged and contamination has entered the bearing.
Frequently Asked Questions
1. What sizes of agricultural bearings does NLHB offer?
NLHB offers agricultural bearings with bore sizes from 12mm upward in round, square and hex bore designs, with outer diameters up to 160mm. Both inch and metric sizes are available, and custom configurations can be produced on request.
2. What seal types are available for agricultural bearings?
Single-lip, double-lip and triple-lip seals are available. Triple-lip seals provide the highest level of protection against dust, mud and abrasive contaminants and are recommended for the most demanding field conditions.
3. Are NLHB agricultural bearings interchangeable with SKF, NTN, Timken or INA parts?
Yes. NLHB agricultural insert bearings follow standard industry part-number conventions (for example 203KRR, 99502H, 6203 2RST) and are dimensionally interchangeable with the corresponding equivalents from SKF, NSK, NTN, FAG, INA and Timken. Always confirm bore, OD, width, seal type and bore shape before substitution.
4. What materials are used in NLHB agricultural bearings?
Rings are produced from high-cleanliness through-hardened 52100 chrome steel (SAE52100 / ISO 100Cr6 / GCr15). Seals use an elevated-temperature NBR compound bonded to heavy-gauge steel shrouds, and bearings are factory-filled with premium polyurea-thickened grease for corrosion resistance and extended life.
NLHB — Ningbo Shuanghua Bearing Co., Ltd.