TB Woods 4JN Insert

The TB Woods 4JN Insert is a high-performance Sure-Flex Plus Neoprene solid sleeve designed for critical power transmission in size 4 coupling assemblies. Engineered with a one-piece solid construction, this 4JN neoprene sleeve provides a balance of high torque capacity and exceptional flame and oil resistance. Built for versatility, it is 100% compatible with existing Sure-Flex Plus flanges, allowing for straightforward retrofitting in industrial drive systems. This elastomeric member excels in dampening torsional vibration and absorbing 4-way flexing action, including parallel misalignment up to 0.010 inches and angular misalignment up to 1 degree.

Operating at speeds up to 7,600 RPM, the 4JN coupling insert is ideal for applications involving pumps, fans, and compressors where harsh environmental conditions are present. The neoprene material provides a temperature operating range from 0°F to 200°F. Because the teeth of the Sure-Flex Plus 4JN lock securely into the flange teeth without the need for clamps or screws, this insert facilitates lubrication-free operation and reduces overall maintenance requirements for the drive train.

• High Torque Capacity: Offers 30% higher torque ratings compared to previous generation sleeves, allowing for potential downsizing of coupling components.
• Chemical Resistance: Neoprene construction provides superior resistance to oil and is flame-retardant, making it suitable for volatile HVACR environments.
• Alignment Forgiveness: Absorbs shock, vibration, and end-float, protecting bearings and sensitive motor components from premature wear.
• Tool-Free Installation: The simple design allows for quick inspection and replacement using only a straightedge and calipers.

Is the 4JN insert interchangeable with EPDM sleeves?
While 4JN (Neoprene) and 4J (EPDM) sleeves share the same physical dimensions and torque ratings for size 4 flanges, Neoprene should be selected for applications requiring oil resistance. Do not use Hytrel inserts in the same flanges as rubber sleeves, as they have different torque ratings and alignment requirements.

What is the maximum operating speed for the 4JN?
The TB Woods 4JN is rated for a maximum speed of 7,600 RPM. Always verify that your system’s operational speed does not exceed the maximum rating of the specific sleeve material used.

Does this solid sleeve require a retaining ring?
No, the 4JN is a single-piece solid sleeve. Retaining rings are typically utilized with two-piece "split" (JNS) sleeves for installation without moving the connected equipment.

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.