SEALMASTER

SEALMASTER pillow block bearings use set screw locking to secure the bearing to the shaft. The set screws are positioned on the inner ring and engage directly with the shaft surface. This method is suitable for applications with moderate speeds and loads where shaft positioning is stable. For higher torque or reversing loads, alternative locking methods such as eccentric collars may be preferred, but SEALMASTER standard units are designed for set screw retention.

Yes, SEALMASTER flange bearings are available in two-bolt configurations, as seen in the SFT series. These units have a cast iron housing with two mounting bolt holes. The bolt size varies by model, ranging from 3/8 in to 9/16 in, depending on the bore size and load rating. The flange design allows for direct mounting on flat surfaces, making them suitable for applications where space is limited or where a pillow block cannot be used.

SEALMASTER bearings are pre-lubricated with NLGI #2 equivalent grease. This is a standard lithium-based grease suitable for general industrial operating temperatures. The bearings are double-sealed to retain the grease and prevent ingress of dust and moisture. Relubrication is not typically required for the service life of the bearing under normal conditions, but the seals allow for regreasing if the application demands it.

The NP series is a general-purpose pillow block with standard base height, while the NPL series is a low-base pillow block with a reduced shaft height. For example, the NP-23 has a shaft height of 1 7/8 in, whereas the NPL-24 has a shaft height of 1 15/16 in for a similar bore size. The low-base design is used when vertical space is constrained or when the shaft centerline must be closer to the mounting surface. Both series use cast iron housings and set screw locking.

Yes, SEALMASTER ER series insert bearings are designed for mounting into customer-fabricated housings or existing equipment. These are retaining-ring cylindrical insert bearings with a radial deep-groove ball design. They have a double-sealed closure and set screw locking. The outer ring width and OD are standardized, allowing them to fit into housings machined to accept the bearing. They are commonly used in conveyor rollers, idlers, and other machinery where a separate housing is not required.

For SEALMASTER bearings with set screw locking, the shaft should be machined to a tolerance of h6 or j6 for inch shafts. The set screws exert a clamping force that requires a clean, burr-free shaft surface. Shaft hardness should be sufficient to prevent indentation under the set screws, typically a minimum of Rockwell C 20. For shafts with a diameter of 1 in or less, a keyway is not required, but for larger bores, a keyway may be specified to prevent rotation under heavy loads.