NSK B17-99D Alternator Bearing – 17x52x17mm Drive End Replacement

NSK B17-99D is a specialized deep groove ball bearing (single row) designed primarily for automotive alternator applications, particularly the drive end (DE) side. It is commonly used in Bosch, Valeo (e.g., A14Vi/A15Vi series), Ford 6G series, and alternators found in vehicles from manufacturers such as Audi, BMW, Ford, Jaguar, Land Rover, Mercedes, Saab, VW, and others.

This is a non-standard size bearing (not part of common 62/63 series catalogs), optimized for high reliability under high-speed rotation, elevated temperatures, belt-driven loads, vibration, and sealed protection in automotive engine environments.

Key Specifications

• Bearing Type: Deep Groove Ball Bearing (Single Row, Radial)

• NSK Designation: B17-99D (common full variants include B17-99D, B17-99T1XDDG8CG16E, B17-99 DDW8CG16E, B17-99 T1XDDG8CM, B17-99DDW, etc.)

• Bore Diameter (d): 17 mm

• Outer Diameter (D): 52 mm

• Width (B): 17 mm

• Seals: Double rubber seals (2RS / DD / DDU) — contact-type seals on both sides for dust, water, and contaminant protection

• Material: High carbon chrome bearing steel ( GCr15)

• Cage: Pressed steel cage

• Clearance: Usually normal (CN) or specially optimized for alternator conditions (some variants use C3 or application-specific clearance)

• Lubrication: Pre-lubricated with high-temperature grease (lithium-based or special alternator-grade; suffix codes like G8C, G16E, CG16E indicate heat-resistant grease for extended life in hot engine bays)

• Weight (approximate): 0.16 – 0.179 kg

• Main Application: Automotive alternator drive end bearing (DE side) — handles pulley/belt loads, high RPM, and temperature variations.

• Common Cross-References / OEM Numbers: Bosch 1120905012, Bosch F00M990415, Valeo 592905 / 592936 / 593674, FAG 806078 / 565007, NTN SC0352LLU / SC03ASSLVA equivalents, Cargo 140263 / 140958, and others like 9947676.