NTN NBLM12749 Tapered Roller Bearing Cone for Manual Transmission Main Shaft

The NTN NBLM12749 is a precision tapered roller bearing cone designed for demanding manual transmission applications. This tapered roller bearing features conical rollers and raceways arranged so the rollers and raceways meet at a common apex, providing high capacity for radial and single thrust loads. Manufactured by NTN, a leading bearing manufacturer, this cone is engineered to meet the rigorous requirements of manual transmission main shafts.

Key Specifications:

• Bore Diameter: 0.8656 inches (21.986mm)
• Cone Width: 0.655 inches (16.637mm)
• Maximum Shaft Fillet Radius: 0.050 inches
• Compatible Cups: LM12710, LM12711
• Material: Case-hardened chrome steel
• Operating Temperature Range: -65°F to +250°F

Construction and Quality:

NTN offers premium tapered roller bearings featuring case-carburized components with cups, cones, and rollers made from case-hardened alloy steel of "Bearing Quality" to provide superior fatigue life and reliability. The precise control of heat treatment, dimensions, and surface finish ensures consistent performance in critical drivetrain applications.

Applications:

This bearing cone is commonly used in 6-speed manual transmission main shafts and countershafts in automotive applications. Tapered roller bearings are sold as separate components (cone and cup), allowing for optimal preload adjustment during assembly. When replacing bearings, both the cone and cup should be replaced together to ensure proper fit and maximum service life.