3304 Double Row Angular Contact Ball Bearing ── 20mm x 52mm x 22.2mm (0.787" Bore) | Heavy-Duty Agricultural & Industrial Drive Bearing | Replaces 5304, SKF 3304 A, FAG NTN 3304 B, 3304-2RS

✦ Technical Specifications & Brand Interchange Matrix

• Bearing Part Number: 3304 / 5304 / 3304-2RS (Heavy-Duty Double Row Bearing)

• Precise Physical Dimensions:

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

  • Outer Diameter (OD - D): 52 mm (2.047 in)

  • Overall Width / Thickness (B): 22.2 mm (0.874 in)

• Industry & Brand Cross-References:

  • American / Industry Standard: 5304

  • SKF Standard Designation: 3304 A (No filling slot design)

  • FAG / NTN Variant Suffixes: 3304 B

⚡ Structural Advantages & Heavy-Duty Performance

• No Filling Slot Angular Contact Design: High-precision internal ball geometry provides an ultra-rigid arrangement capable of supporting heavy radial loads and bi-directional axial forces simultaneously.

• Superior Seal & Contamination Barrier: High-efficiency contact seals create an airtight defensive shield against moisture, mud, slurry, and fertilizer dust.

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

• Vacuum-Degassed GCr15 Chrome Steel: Premium high-carbon chromium steel construction offers maximum dynamic load capacity and superior fatigue resistance under severe field vibration.

🚜 Agricultural & Industrial Machinery Deployment

• Agricultural Implements & Seeders: Direct fit replacement bearing for planter openers, gauge wheels, coulter hubs, and soil conditioning machinery requiring a 20x52x22.2mm unit.

• Industrial Gearboxes & Pumps: Essential heavy-duty bearing unit for agricultural speed reducers, electric motors, hydraulic pumps, and conveyor drives.

• Severe Duty Power Transmission: Designed for demanding machinery operating under heavy continuous soil drag and harsh environment exposure.