5204 Extended Inner Ring Double Row Ball Bearing ── 20mm x 47mm x 31mm (0.787" Bore) | Heavy-Duty Sealed Agricultural Disc Opener & Industrial Drive Assembly | Replaces SKF 5204-2RS, NTN 5204 LLU, NSK 5204 DDU, Koyo 5204 2RS

⚙️ Technical Specifications & Brand Interchange Matrix

Bearing Part Number: 5204 / 5204-2RS (Extended Inner Ring Double Row Unit)

Precise Physical Dimensions:

Inner Diameter (Bore - d): 20 mm (0.787 in)

Outer Diameter (OD - D): 47 mm (1.850 in)

Inner Ring Width / Overall Depth (B): 31 mm (1.220 in)

Major Brand Cross-References:

SKF / Peer Bearing: 5204-2RS / 5204-2RHD

NTN: 5204 LLU / 5204 LLU/3K

NSK: 5204 DDU

Koyo / JTEKT: 5204 2RS

⚡ Structural Advantages & Heavy-Duty Performance

31mm Extended Inner Ring Architecture: Oversized 31mm inner ring width provides significantly greater contact area along the shaft, minimizing shaft fretting, wear, and alignment wobble under continuous heavy field drag.

Double-Row Angular Contact High-Rigidity Design: High-precision internal double-row ball geometry allows for superior absorption of severe combined radial loads and heavy bidirectional axial forces.

Heavy-Duty Contact Rubber Sealing Barrier: High-efficiency contact rubber seals create an airtight defensive shield against moisture, mud, wet slurry, and fertilizer dust contamination.

Maintenance-Free Synthetic Pre-Lubrication: Factory pre-filled with high-grade wide-temperature agricultural synthetic grease, completely eliminating daily routine field maintenance and lube washout.

🚜 Agricultural & Industrial Machinery Deployment

Planters & Seed Openers: Direct fit replacement bearing for row crop planters, grain drills, opener discs, gauge wheels, and coulter hubs requiring a 20x47x31mm double-row bearing.

Agricultural Implements & Drives: Essential heavy-duty bearing unit for soil conditioning tools, rotary cutters, and auxiliary implement drives working under intense field shock.

Industrial Motors & Gearboxes: Designed for heavy-duty electric motors, industrial speed reducers, pumps, and material handling conveyor systems.