Core Application & Target User Demand
This catalog covers stock bearings universally compatible with mainstream drilling rig models (e.g., ZJ50, ZJ70, XJ35) and critical for the operation of core mechanisms such as drawworks, rotary tables, mud pumps, and top drives. Tailored for oilfield maintenance teams, drilling contractors, and rig spare parts warehouses, it addresses pain points like bearing seizure, premature wear, and mechanism failure caused by incompatible or low-quality bearings. The core value lies in ensuring stable rotation of transmission components, reducing unplanned downtime, and adapting to harsh drilling environments (high load, vibration, dust, and variable temperature).
1. Tapered Roller Bearings
Tapered roller bearings in this series are designed to withstand combined radial and axial loads, ideal for drilling rig drawworks and rotary table pinions. Their high load-carrying capacity and wear resistance prevent axial displacement of rotating components. A real on-site maintenance case: A ZJ70 rig's drawworks suffered sudden shutdown during hoisting. Inspection revealed that the 32244 tapered roller bearing was seized due to insufficient lubrication and dust contamination, damaging the shaft. After replacing the bearing (complying with ISO 307:2019 standard) and optimizing the lubrication and dust-proof system, the drawworks resumed normal operation.
Serial No. | Bearing Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | 32148 | Inner/outer ring & roller: High-carbon chromium bearing steel (GCr15SiMn); Cage: Machined brass (H62); Heat treatment: Quenched and tempered (hardness HRC 60-64) | 1. Roller wear due to long-term high radial load; 2. Cage deformation caused by excessive axial thrust | 1. Monitor bearing temperature in real time (avoid exceeding 80℃ during operation); 2. Ensure axial clearance is within 0.05-0.12 mm (adjust per API Spec 7K Clause 6.4.3) |
2 | 32128 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Nylon (PA66) with glass fiber reinforcement; Sealing ring: FKM rubber (compliant with ISO 6195:2018) | 1. Seal failure leading to dust and mud contamination; 2. Roller spalling due to uneven load distribution | 1. Replace the sealing ring every 600 operating hours; 2. Check the coaxiality of the shaft and bearing seat monthly (deviation ≤ 0.1 mm) |
3 | 32136 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Forged steel (40Cr); Surface treatment: Phosphating | 1. Fatigue wear of rollers due to frequent load changes; 2. Corrosion of inner ring caused by water ingress in lubricating oil | 1. Use anti-rust lubricating oil meeting API GL-4 standard; 2. Avoid sudden load increases (limit load change rate to ≤ 10%/s) |
4 | 32244 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Machined brass (H65); Roller surface: Superfinishing | 1. Seizure caused by insufficient lubrication under high load; 2. Outer ring damage due to bearing seat deformation | 1. Ensure lubricating oil supply pressure ≥ 0.2 MPa; 2. Inspect the bearing seat for deformation quarterly and rework if necessary |
5 | 32213 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Nylon (PA6); Sealing ring: Nitrile rubber (Shore hardness 70±5) | 1. Cage wear due to high-speed rotation; 2. Contamination caused by damaged sealing ring | 1. Limit the maximum operating speed to 3000 rpm; 2. Clean the bearing chamber before installing a new bearing |
2. Spherical Roller Bearings
Spherical roller bearings feature self-aligning capability, suitable for drilling rig mud pumps and top drive gearboxes where shaft misalignment may occur. Their excellent shock absorption and load-carrying capacity ensure stable operation under variable load conditions. All products comply with ISO 281:2019 (Rolling Bearings - Dynamic Load Ratings and Rating Life) and API Spec 7K Clause 6.4 (Rotating Components) standards.
Serial No. | Bearing Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | 22213 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Machined brass (H62); Rolling surface: Carburized (hardness HRC 58-62) | 1. Roller wear due to long-term shock load from mud pump operation; 2. Self-aligning failure caused by cage damage | 1. Install a shock absorber between the bearing and the mounting base; 2. Inspect the cage for cracks monthly |
2 | 53526 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Forged steel (35CrMo); Sealing ring: FKM rubber (high-temperature resistant up to 180℃) | 1. High-temperature oil degradation leading to lubrication failure; 2. Roller spalling due to excessive radial load | 1. Replace lubricating oil every 800 operating hours (use oil with viscosity index ≥ 140); 2. Avoid operating at more than 110% of rated radial load |
3 | 53530 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Nylon (PA66) with carbon fiber reinforcement; Surface treatment: Anti-rust plating | 1. Corrosion caused by salt spray in offshore drilling environments; 2. Cage deformation due to uneven temperature distribution | 1. Apply anti-corrosion coating to the bearing outer surface for offshore use; 2. Ensure uniform heat dissipation of the bearing mounting structure |
4 | 53532 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Machined brass (H65); Sealing ring: Perfluoroelastomer (chemical resistant) | 1. Chemical contamination from mud additives leading to seal failure; 2. Roller wear caused by abrasive particles in lubricating oil | 1. Install a 10-micron high-precision oil filter; 2. Verify compatibility of mud additives with bearing seals before use |
3. Cylindrical Roller Bearings
Cylindrical roller bearings are designed for high radial load and high-speed rotation, suitable for drilling rig electric motor shafts and mud pump crankshafts. Their simple structure and high rigidity ensure efficient power transmission. A real on-site maintenance case: An XJ35 rig's mud pump crankshaft vibrated violently during operation. Inspection found that the 3544 cylindrical roller bearing had worn rollers due to improper installation (excessive interference fit), causing shaft eccentricity. After replacing the bearing and adjusting the fit tolerance (complying with GB/T 275-2019), the vibration was eliminated.
Serial No. | Bearing Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | 3544 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Machined brass (H62); Roller surface: Superfinishing | 1. Roller wear due to excessive interference fit during installation; 2. Lubrication failure caused by oil channel blockage | 1. Control interference fit between bearing and shaft within 0.015-0.03 mm; 2. Clean the oil channel before installing the bearing |
2 | 3526 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Nylon (PA6); Sealing ring: Nitrile rubber (Shore hardness 70±5) | 1. Seal damage leading to dust contamination; 2. Cage wear due to high-speed rotation | 1. Inspect the sealing ring for damage every 300 operating hours; 2. Limit the maximum operating speed to 4000 rpm |
3 | 3534 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Forged steel (40Cr); Surface treatment: Phosphating | 1. Fatigue failure of rollers due to long-term continuous operation; 2. Corrosion caused by water ingress in the lubrication system | 1. Arrange regular shutdown maintenance every 1200 operating hours; 2. Install a water separator in the lubrication system |
4 | 3536 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Machined brass (H65); Sealing ring: FKM rubber | 1. High-temperature deformation of the outer ring; 2. Roller wear caused by uneven load distribution | 1. Ensure the bearing mounting surface is flat (flatness ≤ 0.02 mm/m); 2. Monitor bearing temperature and load distribution in real time |
5 | 3524 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Nylon (PA66) with glass fiber reinforcement; Sealing ring: Perfluoroelastomer | 1. Chemical corrosion from aggressive mud additives; 2. Cage cracking due to shock load | 1. Confirm compatibility of mud additives with bearing materials; 2. Avoid sudden startup/shutdown of the connected mechanism |
4. Double Row Angular Contact Ball Bearings & Other Special Bearings
This series includes double row angular contact ball bearings and other special bearings, suitable for drilling rig top drive motors and auxiliary transmission systems. Their high precision and stability prevent bearing skidding under high-speed rotation, ensuring precise power transmission.
Serial No. | Bearing Model | Material | Main Wear Reasons | Damage Prevention Notes |
1 | 37951K | Inner/outer ring & ball: GCr15 bearing steel; Cage: Machined brass (H62); Contact surface: Hardened (HRC 60-64) | 1. Ball wear due to high-speed rotation; 2. Seal failure leading to lubricating oil leakage | 1. Use high-speed lubricating grease (NLGI Grade 2); 2. Tighten the bearing end cap bolts evenly (torque: 80-100 N·m) |
2 | 7549436 | Inner/outer ring & ball: GCr15SiMn bearing steel; Cage: Forged steel (35CrMo); Sealing ring: FKM rubber | 1. Fatigue cracking of the outer ring due to high load; 2. Contamination caused by dust entering the bearing chamber | 1. Avoid operating at more than 105% of rated load; 2. Install a dust-proof cover with labyrinth seal |
3 | 19954EQ | Inner/outer ring & ball: GCr15 bearing steel; Cage: Nylon (PA66); Surface treatment: Anti-rust plating | 1. Cage deformation due to uneven temperature; 2. Ball spalling due to poor lubrication | 1. Ensure uniform heat dissipation of the bearing; 2. Inject lubricating grease every 500 operating hours |
4 | 2007140 | Inner/outer ring & ball: GCr15SiMn bearing steel; Cage: Machined brass (H65); Sealing ring: Nitrile rubber | 1. Corrosion caused by moisture in the air; 2. Ball wear due to misalignment | 1. Store spare bearings in a dry environment (humidity ≤ 60%); 2. Inspect shaft coaxiality monthly (deviation ≤ 0.1 mm) |
5 | 1681/800 | Inner/outer ring: GCr15 bearing steel; Roller: Tungsten carbide; Cage: Forged steel | 1. Roller wear due to abrasive particles; 2. Inner ring damage due to excessive interference | 1. Use a high-precision filter in the lubrication circuit; 2. Strictly control the fit tolerance between bearing and shaft |
6 | 91682/800 | Inner/outer ring: GCr15SiMn bearing steel; Roller: Ceramic composite; Cage: Machined brass | 1. Ceramic roller cracking due to shock load; 2. Seal failure leading to lubrication loss | 1. Avoid sudden load impacts; 2. Replace the sealing ring every 600 operating hours |
7 | 32630 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Nylon (PA6); Sealing ring: FKM rubber | 1. Roller wear due to long-term high load; 2. Cage wear due to high speed | 1. Monitor bearing load in real time; 2. Limit operating speed to below the rated maximum |
8 | 3630 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Forged steel; Surface treatment: Phosphating | 1. Corrosion caused by lubricating oil oxidation; 2. Roller spalling due to fatigue | 1. Replace lubricating oil regularly; 2. Arrange periodic maintenance to check for fatigue signs |
9 | 3053128 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Machined brass; Sealing ring: Nitrile rubber | 1. Seal damage leading to contamination; 2. Axial displacement causing wear | 1. Inspect seals regularly; 2. Ensure proper axial positioning of the bearing |
10 | 138 | Inner/outer ring & ball: GCr15 bearing steel; Cage: Nylon; Sealing ring: FKM rubber | 1. Ball wear due to low-quality lubricant; 2. Cage deformation due to overheating | 1. Use lubricant meeting API standards; 2. Monitor bearing temperature to avoid overheating |
11 | 8130 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Forged steel; Surface treatment: Anti-rust | 1. Roller wear due to uneven load; 2. Corrosion caused by harsh environment | 1. Optimize load distribution; 2. Apply anti-corrosion coating for harsh environments |
12 | 8144 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Machined brass; Sealing ring: Perfluoroelastomer | 1. Chemical corrosion from mud additives; 2. Lubrication failure due to oil contamination | 1. Verify additive compatibility; 2. Maintain clean lubricating oil |
13 | 8228 | Inner/outer ring & ball: GCr15SiMn bearing steel; Cage: Nylon with carbon fiber; Sealing ring: FKM rubber | 1. Cage cracking due to high speed; 2. Ball wear due to dust contamination | 1. Limit operating speed; 2. Enhance dust-proof measures |
14 | 3003136 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Forged steel; Heat treatment: Quenched and tempered | 1. Roller spalling due to fatigue; 2. Outer ring damage due to mounting surface irregularities | 1. Conduct periodic fatigue inspections; 2. Ensure mounting surface flatness |
15 | 3003148 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Machined brass; Sealing ring: Nitrile rubber | 1. Seal failure leading to lubrication loss; 2. Roller wear due to high load | 1. Replace seals regularly; 2. Operate within rated load range |
16 | 3644 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Nylon; Surface treatment: Phosphating | 1. Cage deformation due to temperature changes; 2. Corrosion caused by moisture | 1. Control temperature fluctuations; 2. Store and use in dry environment |
17 | 206 | Inner/outer ring & ball: GCr15 bearing steel; Cage: Nylon; Sealing ring: FKM rubber | 1. Ball wear due to misalignment; 2. Seal damage leading to contamination | 1. Correct shaft alignment; 2. Inspect seals regularly |
18 | 13536 | Inner/outer ring & roller: GCr15SiMn bearing steel; Cage: Forged steel; Sealing ring: Perfluoroelastomer | 1. Chemical corrosion; 2. Roller wear due to abrasive particles | 1. Use compatible lubricants and seals; 2. Filter lubricating oil effectively |
19 | 3053734 | Inner/outer ring & roller: GCr15 bearing steel; Cage: Machined brass; Surface treatment: Anti-rust plating | 1. Corrosion during storage; 2. Roller spalling due to fatigue | 1. Proper storage conditions; 2. Periodic fatigue checks during use |
20 | 1000944 | Inner/outer ring & ball: GCr15SiMn bearing steel; Cage: Nylon with glass fiber; Sealing ring: FKM rubber | 1. Cage wear due to high speed; 2. Seal failure leading to lubrication loss | 1. Limit operating speed; 2. Replace seals and lubricate regularly |
Procurement & Technical Reference Standards
All bearings in this catalog comply with international standards such as ISO 307:2019 (Rolling Bearings - Radial Bearings with Cylindrical Bores and Tapered Bores), ISO 281:2019 (Rolling Bearings - Dynamic Load Ratings and Rating Life), and API Spec 7K (Drilling Equipment), as well as domestic standards GB/T 275-2019 (Rolling Bearings - Tapered Roller Bearings - Boundary Dimensions) and GB/T 307.1-2015 (Rolling Bearings - Radial Bearings - Boundary Dimensions, General Plan). For procurement, key guidelines include: 1) Confirm the exact bearing model, application mechanism (drawworks/rotary table/mud pump), and rated load/speed to ensure compatibility with the drilling rig; 2) Prioritize batch procurement of frequently used models (e.g., 32148, 53526, 3544) to meet emergency maintenance needs; 3) Verify the supplier's quality certification (e.g., ISO 9001, API Q1) to ensure product reliability and traceability.
Technical maintenance reference: 1) Establish a preventive maintenance schedule based on operating hours: daily inspection of bearing temperature, vibration, and lubrication status; weekly inspection of sealing and fastening conditions; monthly measurement of bearing clearance and shaft coaxiality; semi-annual disassembly and inspection of internal components (replace bearings when wear exceeds 30% of original dimensions); 2) Use only OEM-compatible lubricants and seals (complying with API GL-4 or ISO 6195:2018) to avoid damaging the bearing's internal structure; 3) Maintain detailed maintenance records, including operating hours, inspection results, and replacement parts information, to achieve full-life cycle management; 4) Conduct pre-startup inspections before each drilling operation to ensure bearings are free of abnormalities (no abnormal noise, no overheating, no leakage).
Call to Action
Reliable bearings are critical for the stable and efficient operation of drilling rigs. Our catalog offers a comprehensive range of stock bearings compatible with mainstream drilling rig models, featuring high-quality materials, standard compliance, and tailored solutions for different core mechanisms. Combined with professional on-site maintenance experience, we provide comprehensive technical support including bearing selection, troubleshooting, and maintenance guidance. Whether you need emergency replacement bearings to resolve unplanned downtime, long-term spare parts supply agreements, or technical consulting on bearing maintenance, our team is ready to assist. Contact us today to discuss your specific needs and obtain personalized procurement plans that reduce maintenance costs, improve operational efficiency, and enhance the overall reliability of your drilling rigs.
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