Flange Bearing Units

4-bolt square (UCF200/UCF300): four corner bolts on a square plate — highest housing rotation resistance, suits vertical frame faces. 3-bolt bracket (UCFB200): one top-centre and two lower-corner bolts at 45° — more rotation resistance than 2-bolt, suits corner locations where only three fixing points are available. 2-bolt oval (UCFL200/UCFL300): two bolts on the long axis of an oval plate — lowest material and installation cost, adequate for most light to medium duty applications. Choose based on available bolt positions and required housing rotation resistance.

Yes. The UC series wide inner ring insert is identical for equivalent bore sizes across all standard-duty UC-family housings: UCP200 (pillow block), UCF200 (4-bolt square), UCFL200 (2-bolt oval), and UCT200 (take-up unit). Stocking one UC insert type covers all four housing formats for the same bore on the same machine, reducing spare parts inventory and simplifying in-service housing format changes.

Choose UCFS300 when the bearing position requires repeatable reinstallation without re-centring after each bearing replacement, or when the machine frame specifies a piloted flange for assembly-line positional repeatability. The precision pilot on the back face of the UCFS300 housing locates the housing concentrically in a matching frame bore independently of the bolt-tightening sequence, to an H7-fit tolerance. For standard installations where reinstallation precision is not a design requirement, UCF300 is sufficient.

Both use a taller housing that fully encloses the NA series wide inner ring insert within the housing profile, preventing the inner ring from protruding beyond the flange face. NAFS200 is for 4-bolt square flange positions; NAFLU200 is for 2-bolt oval flange positions. Inner ring protrusion becomes a concern at larger bore sizes where the standard NAF200/NAFL200 housing height is insufficient to contain the wide NA insert — it creates interference with adjacent couplings, guards, and covers. The extended housing eliminates this without changing any mounting bolt positions.

UCFT200 and UEFT200 use housing dimensions derived from inch fractions (H, J, A2, A1, A, L in inch-fraction equivalents). When an existing machine frame has bolt holes drilled to inch-standard positions, fitting a metric UCFL200 would require slot-drilling or re-drilling to close a gap of typically 0.3–1.5 mm between metric and inch-fraction hole positions. UCFT200/UEFT200 drop into the existing inch-standard holes without modification. For new machines designed in metric, UCFL200/UEFL200 are the standard choice.

The UCFA200 slotted bolt holes provide approximately ±30° of housing rotation about the shaft axis (exact range depends on bore size — check N2 slot arc length in the specification table). This adjustment corrects angular misalignment between the shaft axis and the panel face without re-drilling or shimming. It is most needed on field-erected steel structures, welded fabrication frames, and retrofit positions where the mounting panel face cannot be guaranteed perpendicular to the shaft. On machined or precision-located panels, standard UCFL200 is sufficient.