B17-99 Open Deep Groove Ball Bearing | 17×52×17 mm for Automotive Alternators & Transmissions

• High-output alternators and starter motors
  
• Air conditioning (A/C) compressor clutches
  
• Water pumps and automotive tensioner pulleys
  
• Manual transmission gearboxes and differentials

• Heavy-duty electric motor shafts (stators/rotors)
  
• Industrial air compressors and fluid pumps
  
• Conveyor belt drive systems and reduction gears
  
• Commercial-grade ventilation and exhaust fans

• Tractor power take-off (PTO) assemblies
  
• Harvester and tiller drive mechanisms
  
• Earth-moving equipment gear systems
  
• Heavy hydraulic pump assemblies

• Large-scale industrial rotary tools
  
• Commercial lawncare machinery
  
• Heavy-duty textile processing equipment
  
• Automated machining center components

01. Open Architecture for Maximum Lubrication

Manufactured without side closures, the open design permits free-flowing oil or grease to continuously wash over the rolling elements. This ensures optimal hydrodynamic lubrication, radically reducing internal operating temperatures and friction during high-speed, sustained operations.

02. Heavy-Duty Geometric Profile

With an expanded 52mm outer diameter and a thick 17mm cross-section, this bearing provides exceptional structural rigidity. The specialized deep-groove pathways and enlarged steel balls allow the B17-99 to absorb heavy shock loads, high radial forces, and moderate bi-directional axial loads with ease.

03. Automotive-Grade Chrome Steel (GCr15)

Forged from premium vacuum-degassed 52100/GCr15 chrome steel, both the inner/outer rings and the precision-grade balls undergo advanced thermal treatments. This process achieves uniform structural hardness, providing superior resistance to metal fatigue, wear, and mechanical deformation under immense rotational stress.

Interchange Part Numbers

Directly replaces the following equivalent manufacturer parts:

• NSK: B17-99
• SKF: 17X52X17 Open (Custom Automotive)
• KOYO: B17-99
• NTN: B17-99
• Nachi: B17-99
• FAG: 17x52x17 Unsealed

Design & Configuration

The B17-99 Open bearing is supplied with a light preventative anti-rust oil coating, ready to be integrated directly into your equipment's existing lubrication system. For high-heat engine compartment applications, we frequently supply this model with a C3 internal radial clearance to safely accommodate thermal expansion without risking bearing seizure. If your assembly requires pre-lubricated protection against heavy dust or water exposure, please inquire about our B17-99 variants with rubber contact seals (2RS/DDU) or steel shields (ZZ/ZZX).

"Combining rugged structural integrity with a friction-eliminating open architecture, the B17-99 ensures maximum mechanical efficiency and longevity for the world's most demanding automotive powertrains."