838607A Agricultural Ball Bearing ── 16mm x 45mm x 18.64mm (0.630" Bore) | Heavy-Duty Sealed Planter Disc Opener & Gauge Wheel Bearing | Fits John Deere AA21480 | Replaces 204RY2, 204PY3, DG1645-2RS, 204FREN, 204FVMN

❖ Technical Specifications & OEM / Brand Matrix

• Bearing Part Number: 838607A / 204RY2 (Heavy-Duty Agricultural Ball Bearing)

• Precise Physical Dimensions:

  • Inner Diameter (Bore - d): 16 mm (0.630 in)

  • Outer Diameter (OD - D): 45 mm (1.772 in)

  • Inner Ring Width / Thickness (B): 18.64 mm (0.734 in)

• OEM Equipment Replacements:

  • John Deere OEM: AA21480

• Industry Standard Cross-References:

  • Industry Interchanges: 204RY2, 204PY3, DG1645-2RS

  • Manufacturer Cross-References: 204FREN, 204FVMN

⚡ Structural Advantages & Heavy-Duty Performance

• Extended Inner Ring Architecture: 18.64mm inner ring width distributes mechanical load over a wider shaft seating area, preventing shaft wear, fretting corrosion, and alignment wobble during high-speed field operations.

• Heavy-Duty Multi-Lip Sealing: High-efficiency contact rubber seals form an airtight defense against moisture, mud, fertilizer dust, and abrasive soil grit contamination.

• Maintenance-Free Synthetic Pre-Lubrication: Factory pre-filled with high-grade wide-temperature agricultural synthetic grease, eliminating daily field servicing and lubricant washout.

• Vacuum-Degassed GCr15 Chrome Steel: Premium high-carbon chromium steel construction provides maximum dynamic load capacity and exceptional fatigue resistance against heavy field shock.

🚜 Agricultural Machinery Deployment & Usage Scenarios

• Row Crop Planters & Disc Openers: Direct fit replacement for John Deere planter disc openers, seed drills, and gauge wheel assemblies requiring a 16x45x18.64mm bearing.

• Grain Drills & Coulters: Essential heavy-duty bearing unit for seed drills, rolling coulters, and soil preparation attachments.

• High-Speed Seeding Equipment: Designed for demanding agricultural seeding tools operating under continuous soil drag, wet slurry, and dust exposure.