Fafnir 311NPP Deep Groove Ball Bearing 55mm Bore 120mm OD 29mm Wide Torrington

Fafnir 311NPP Deep Groove Ball Bearing 55mm Bore 120mm OD 29mm Wide Torrington

The Fafnir 311NPP is a single-row deep groove radial ball bearing with a non-contact rubber seal (NPP designation), manufactured by Fafnir — the bearing division of Torrington, which was an Ingersoll-Rand company. Deep groove ball bearings of this series are designed to handle primarily radial loads while also accommodating moderate axial (thrust) loads in either direction. The rubber seal keeps grease in and contaminants out without contacting the inner ring, keeping friction low while providing good protection in typical industrial environments.

Specifications & What's Included

• Model / MPN: 311NPP
• Bearing Type: Single-Row Deep Groove Ball Bearing
• Inner Diameter (Bore): 55 mm
• Outer Diameter: 120 mm
• Width / Thickness: 29 mm
• Seal Type: Non-Contact Rubber Seal (NPP — both sides)
• Design: Radial, single row
• Brand: Fafnir (Torrington / Ingersoll-Rand)
• Includes: Bearing in original sealed plastic wrap, in original Fafnir/Torrington green box

Applications

Deep groove ball bearings in the 311 series are a standard industrial bearing size used across a wide range of rotating machinery. Common applications include electric motors, pumps, gearboxes, machine tool spindles, agricultural equipment, textile machinery, automotive components, and general-purpose industrial drives. The 55mm bore suits mid-to-large shaft assemblies. The NPP rubber seal makes this bearing particularly well-suited to moderately dirty or moist environments where a sealed bearing is preferred over an open or shielded design. Fafnir-branded bearings were produced in the United States and were widely specified in American industrial and OEM equipment from the mid-twentieth century onward; the Torrington and Fafnir names remain common in MRO and replacement-parts searches today.