FRW155zz is a flanged extended-inner-ring ball bearing. Its confirmed configuration is single row, shielded, and specified for radial loading. Selection depends on the interaction of its contact geometry, dimensional interfaces, component materials, enclosure, internal condition, and published operating data rather than on the model code or catalog family alone.
How the Bearing Carries Load
FRW155zz combines a radial ball-bearing load path with an outer-ring flange that provides a positive housing-side axial locating interface. The confirmed flange geometry is 0.359″ outside diameter and 0.036″ thickness. The flange locates the bearing; the main outside diameter remains the primary radial seating surface.
The housing should support the cylindrical outer-ring surface uniformly and provide clearance for the flange. Uneven clamping or force concentrated at the flange edge can tilt or distort the outer ring, so mounting-face flatness and shoulder geometry remain part of the bearing installation.
Dimensions That Control Installation
The principal envelope for FRW155zz is defined by bore 0.15625″, outside diameter 0.3125″, and width 0.125″. These dimensions must agree with the shaft, housing, shoulders, and available axial space as a coordinated set. They are interface controls, not isolated values to be matched independently.
The specified interface limits include bore tolerance -0.0003″ to 0″, outside diameter tolerance -0.0003″ to 0″, and width or height tolerance -0.005″ to 0″. These limits support fit and stack-up evaluation but do not prescribe the finished shaft or housing fit. Ring rotation relative to load, mating-part material and stiffness, temperature change, and the required installed condition must be considered together.
Installation Interfaces
Installation of FRW155zz should use clean, burr-free shaft and housing seats and apply force through the ring being fitted. Assembly force should not pass through the rolling elements, and the selected fit should account for ring rotation relative to load, mating-part stiffness, and temperature.
Shoulder squareness, seat roundness, concentricity, and uniform housing support influence alignment and running clearance. After mounting, free rotation, torque, noise, and temperature behavior can help identify binding, contamination, distortion, or unintended preload.
Material Configuration
The fixed component specifications for FRW155zz identify rings as Chrome Steel, rolling elements as Chrome Steel, cage as Stainless Steel, and shield as 300 Series Stainless Steel. Each value remains tied to its component role; ring material does not define ball, cage, seal, or shield material, and different materials may legitimately be specified for different components.
Component materials influence contact behavior, stiffness, thermal response, wear, lubricant compatibility, and environmental suitability. Those effects depend on the actual material pair, heat treatment, surface condition, lubricant, fits, load, speed, temperature, and exposure; no corrosion, electrical, chemical, food, medical, marine, or other application qualification is implied without explicit supporting data.
Tolerance and Clearance Considerations
The listed internal-condition data for FRW155zz include precision notation ABEC1, clearance designation MC3, and radial clearance 0.00008″ to 0.0005″. The notation is retained exactly as supplied; no unsupported equivalence between ABEC, ISO, P-class, or manufacturer-specific terms is introduced.
Initial clearance and catalog precision do not describe the complete installed condition. Interference fits, ring temperature difference, shaft and housing geometry, shoulder runout, cleanliness, mounting force, and operating load can alter running clearance, alignment, torque, and contact distribution.
Ratings, Speed, and Temperature
The published radial ratings for FRW155zz are 69 lbf dynamic and 27 lbf static. These values belong to different engineering checks: the dynamic rating supports rotating-fatigue evaluation, while the static rating is relevant to permanent-deformation risk under stationary, peak, or slowly moving load.
The operating data also provide maximum-speed entry 53 under the published ×1,000 rpm convention and temperature entry -86 to 230 °F. These are selection inputs, not independent guarantees of assembled performance. Fit, load, lubrication, closure drag, heat removal, alignment, and duty cycle determine whether the complete application can operate within the published conditions.
Seal, Shield, and Lubrication Condition
FRW155zz is specified as shielded. The recorded shield material is 300 Series Stainless Steel. A shield provides a non-contact barrier that assists lubricant retention and limits direct entry of larger particles; it is not equivalent to a contact seal or proof of liquid exclusion.
The lubrication entry for FRW155zz is Required. The application must establish lubricant type, quantity, delivery, and maintenance. This entry does not identify a particular grease or oil and must not be interpreted as a prelubricated condition.
Configuration-Level Selection Guidance
FRW155zz may be considered for compact housings that benefit from a positive outer-ring axial locating face. These are general engineering contexts rather than certifications or guarantees of suitability. Final selection should verify load magnitude and direction, duty cycle, speed, temperature, lubrication, contamination exposure, required life, fits, and structural support.
The practical identity of FRW155zz comes from the way its dimensions, contact geometry, component materials, closure, internal condition, and published operating data work together. A bearing with the same bore can behave differently when its width, outer diameter, row arrangement, enclosure, clearance, material configuration, or ratings differ.
