This Spyraflo BFM-4M-NN steel flanged non-aligning needle roller bearing unit with two bolt holes and a 4mm bore diameter is suitable for applications with medium loads, high speeds, and rotational motion only (no oscillation or linear motion). The ready-to-mount flanged housing is made of steel for strength, resistance to shock loads, and lighter weight than cast iron. Its low profile, two bolt-hole design is suitable for applications with limited space. The bearing insert in the housing contains through-hardened, drawn-cup needle rollers retained by a cage. The cage spaces the needle rollers for even load distribution and prevents contact to minimize friction, vibration, and noise. Instead of rolling on an inner raceway, the rollers run directly against the shaft. Suitable shafts must be hardened to Rockwell C-58 to C-64, and have a 16 RMS (root mean square) finish. This electrically conductive, self-aligning bearing compensates for static misalignments and comes prelubricated with lithium-complex grease. This flanged bearing is suitable for use in various applications including electrical switchgear, document handling machines, and motors, among others.

Specifications

Shaft requirements Rockwell C-58 to C-64 hardness rating, with a minimum surface finish of 16 RMS Static misalignment +/- 5 degrees Temperature range -22 to +212 degrees F (-30 to +100 degrees C)

Mounted bearings combine a bearing mounted inside a housing unit. The bearing housing replaces the need for a casting or weldment to position the bearing securely for reliable operation, and its design determines the type of insert bearing. Insert bearings use rolling elements (ball, cylindrical, spherical, barrel, needle, spindled, or tapered) to maintain the separation between moving parts to reduce rotational friction, and to support radial and axial loads. Available in a variety of materials and mounting configurations, mounted bearings can be one- or two-piece, they can have an extended inner ring and locking device, and they can have seals and end caps that retain lubrication and protect the working parts of the bearing from environmental debris. Mounted bearings support shafts in a variety of mounting configurations (flange block, hanger, pillow block, and take-up block), and are used in a range of applications from light duty shaft guidance on conveyors to road building equipment and crushers.

Spyraflo manufactures bearings and bearing accessories. The company, founded in 1961 and headquartered in Peachtree City, GA, meets International Organization for Standardization (ISO) standard 9001:2008.