Timken 99312 Redi-Sleeve Precision Shaft Repair Sleeve

Description:

The Timken National Redi-Sleeve 99312 is a precision-engineered stainless steel shaft repair sleeve designed to restore worn, grooved, or damaged shaft sealing surfaces without requiring shaft replacement or machining. Installed directly over the existing shaft, it creates a smooth, wear-resistant, and corrosion-resistant sealing surface for standard radial shaft oil seals, extending seal life while reducing maintenance costs and equipment downtime. The 99312 Redi-Sleeve is widely used in industrial gearboxes, pumps, compressors, electric motors, conveyors, mining equipment, and other heavy-duty rotating machinery. Maintenance teams, OEMs, and system integrators rely on this shaft repair sleeve for equipment repair, retrofit, replacement, expansion, and preventive maintenance to restore sealing performance and maximize equipment reliability.

Applications:

The Timken National Redi-Sleeve 99312 is designed to repair worn shaft seal contact surfaces while allowing continued use of the original shaft and standard oil seal size. Its precision thin-wall stainless steel construction provides a hardened sealing surface with minimal impact on shaft dimensions, making it ideal for industrial gearboxes, pumps, compressors, electric motors, wheel-end assemblies, conveyors, agricultural machinery, mining equipment, and other rotating equipment where shaft wear has caused lubricant leakage or premature seal failure.

Technical Specifications:

• Manufacturer Part Number (MPN): 99312
• Manufacturer: Timken National
• Product Type: Shaft Repair Sleeve (Redi-Sleeve®)
• Product Series: Redi-Sleeve® 99000 Series
• Material: Stainless Steel
• Design Units: Inch (Imperial)
• Shaft Size Range: 3.120–3.126 in (79.248–79.400 mm)
• Nominal Shaft Diameter: 3.125 in (79.38 mm)
• Flanged Outside Diameter: 3.531 in (89.687 mm)
• Width on Shaft (Seal Running Surface): 0.813 in (20.65 mm)
• Overall Width: 1.000 in (25.40 mm)
• Installation Depth: 2.000 in (50.80 mm)
• Construction: Precision Thin-Wall Stainless Steel Sleeve with Installation Flange
• Surface Finish: Precision Ground, Lead-Free Running Surface
• Function: Restores worn shaft sealing surfaces without shaft replacement or machining
• Compatible Components: Standard radial shaft oil seals for approximately 3.125 in shaft diameters
• Typical Applications: Pumps, gearboxes, compressors, electric motors, conveyors, mining equipment, agricultural machinery, wheel hubs, and industrial power transmission systems.

Common Replacements:

• SKF Speedi-Sleeve 99312
• National Redi-Sleeve 99312 Equivalent
• CR Shaft Repair Sleeve for 3.125 in Shaft Diameter