The Timken Company STO-12-ZZ Needle Roller Bearing

Description:

The Timken STO-12-ZZ needle roller bearing is used to support cam, track, and guide roller applications requiring high radial load capacity and smooth rolling performance in industrial machinery. Commonly installed in conveyor systems, packaging equipment, automated machinery, material handling equipment, and cam-driven mechanisms where compact, heavy-duty track rollers are required. Maintenance teams, OEMs, and system integrators use this bearing for replacement, repair, retrofit, and equipment overhaul to restore reliable rolling motion and minimize equipment downtime.

Applications:

The Timken STO-12-ZZ is a crowned outside diameter yoke-type needle roller bearing with double shields that provides excellent rolling characteristics, accommodates slight misalignment, and protects against contamination. It is widely used in conveyor guide rails, cam followers, indexing equipment, automation systems, textile machinery, and industrial processing equipment where high radial loads and compact bearing designs are essential.

Technical Specifications:

• Manufacturer: Timken
• Manufacturer Part Number (MPN): STO-12-ZZ
• Product Type: Yoke-type needle roller bearing
• Bearing Type: Needle roller track roller
• Bore Diameter (ID): 12 mm
• Outside Diameter (OD): 32 mm
• Overall Width: 16 mm
• Roller Width: 15.8 mm
• Outside Diameter Style: Crowned OD
• Closure Type: Double shielded (ZZ)
• Rolling Elements: Needle rollers
• Dynamic Load Rating: 9.13 kN
• Static Load Rating: 11.7 kN
• Maximum Grease Speed: 8,100 rpm
• Application: Cam followers, guide rollers, and track roller systems

Common Replacements:

• Timken NAST-12-ZZ
• Koyo STO12ZZ
• INA STO12