TB Woods 3JN Insert

The TB Woods 3JN Insert is a precision-engineered neoprene coupling sleeve designed for high-performance Sure-Flex Plus series assemblies. This size 3 coupling sleeve features a single piece solid design, ensuring maximum torsional rigidity and consistent power transmission in critical HVACR drive systems. Constructed from high-grade neoprene, the 3JN provides superior resistance to oil and chemical exposure compared to standard EPDM alternatives, making it the industry standard for centrifugal pumps, blowers, and reciprocating compressors. With a rated torque of 78 in-lb and a maximum speed of 9,200 RPM, this insert effectively manages angular misalignment up to 1° and parallel misalignment up to 0.01 inches. Its 4-way flexing action is specifically tuned to absorb shock loads and dampen damaging vibrations, protecting your motor and driven equipment from premature wear. This industrial elastomer insert is a direct drop-in replacement, providing a 30% increase in torque capacity over older 3J models while maintaining thermal stability between 0°F and 200°F.

Key Benefits

• Chemical and Oil Resistance: The neoprene material is ideal for environments where petroleum products or harsh chemicals are present.
• Shock Absorption: Advanced 4-way flexing action dampens vibration and handles end float to protect sensitive HVACR equipment.
• High Torque Density: The Sure-Flex Plus design allows for a 78 in-lb torque rating in a compact size 3 form factor.
• Zero Maintenance: Solid one-piece construction eliminates the need for lubrication or periodic adjustments.
• Operational Efficiency: Capable of handling speeds up to 9,200 RPM while maintaining precise synchronization.

Common Questions

What is the difference between the 3J and 3JN inserts?
The 3J is a standard EPDM insert, whereas the 3JN is manufactured from neoprene. The 3JN neoprene sleeve offers enhanced resistance to oils and chemicals and is rated for higher torque applications within the Sure-Flex Plus product line.

Can I use a solid sleeve if my flanges are already installed?
The single piece solid 3JN requires sliding the flanges off the shaft for installation. If the shafts cannot be moved or the flanges are fixed, a split-sleeve (3JNS) is usually required. However, the solid 3JN insert is preferred for new installations due to its superior structural integrity at high RPMs.

Is the TB Woods 3JN compatible with other brand flanges?
The TB Woods 3JN is specifically designed for Sure-Flex Plus flanges. While some "will-fit" imitators exist, using genuine TB Woods inserts ensures the 30% torque increase and 3X service life improvements are realized.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.