FAGThin Section Angular Contact Ball Bearing, 4.500 x 5.000 x 1/4 in, Square 1/4 x 1/4 in Section, Type A Single Row, Open, Brass Separator

Product Description

What this part is

A thin section angular contact ball bearing, 4.500 in bore x 5.000 in outside diameter x 0.250 in wide. It crosses to Kaydon KA045AR0 and Silverthin SA045AR0 — open, single row, Type A angular contact, with 1/8 in balls in a one-piece machined brass pocket separator, ABEC Class 1.

Cross section

Thin section bearings are built on a square cross section, so (outside diameter − bore) ÷ 2 equals the width. Here (5.000 − 4.500) ÷ 2 = 0.250 in of wall each side, matching the 1/4 in width. Silverthin’s datasheet for SA045AR0 gives 4.500 x 5.000 x 1/4 in.

Decoding the designation

L15: FAG thin section series prefix.

Q: the cross-section code. Q, R, S and T are ascending sections mapping to Kaydon’s letters: Q = 1/4 x 1/4, R = 5/16 x 5/16, S = 3/8 x 3/8, T = 1/2 x 1/2. Q is the 1/4 in section.

A: Type A, single row angular contact, thrust in one direction.

408: bore in whole inches plus sixteenths, so 4 and 08/16 = 4.500 in. SKF uses the identical digits in its FPAA408.

YP: one-piece machined brass circular-pocket separator.

Published ratings and dimensional data

Static radial load capacity: 1,660 lbf.

Dynamic radial load capacity: 637 lbf on the Kaydon method, 1,410 lbf on the ISO 281:1990 basis.

Static thrust load capacity: 4,810 lbf.

Dynamic thrust load capacity: 1,580 lbf.

Land diameters: L1 4.686 in, L2 4.814 in, L3 counterbore 4.865 in.

Ball diameter: 1/8 in.

Maximum fillet radius cleared: 0.025 in.

Race width tolerance: +0.000 / −0.005 in.

Precision: ABEC Class 1.

Weight: 0.210 lb.

Corners: normally chamfered.

Radial and thrust ratings are separate columns, and a combined load is checked against a combined-load calculation.

Thin section characteristics

The ratings are small relative to the bearing’s diameter, at 637 lbf dynamic radial from a five-inch bearing. The section trades load capacity for a thin radial wall and a large open bore. The design driver is usually something passing through the middle, such as a hollow shaft, cable bundle, slip ring, laser path or coolant line. Typical uses are robotics joints, gimbals, rotary and index tables, medical imaging gantries, semiconductor wafer handlers and optical positioners. At 1/8 in ball diameter this is one of the finer sections in the range and a light-duty precision positioning bearing.

Mounting data

Maximum fillet radius cleared: 0.025 in.

Race width tolerance: +0.000 / −0.005 in.

Thin rings are flexible and adopt the form of the housing bore or shaft seat they are clamped into.

Type A carries thrust in one direction. Reversing thrust is served by a duplex pair, BR0 or FR0, or by a four-point contact bearing, XP0.

Interchange guidance

Crosses: Kaydon KA045AR0, Silverthin SA045AR0, SKF FPAA408, NSK NBA11406, NTN KYA045, RBC KA045AR0, SSB RA045AR0, INA CSEA045, the INA reference being a Schaeffler in-house sibling.

Related designs at the same bore: SA045CP0 / KA045CP0 radial contact, SA045XP0 / KA045XP0 four-point contact, SA045BR0 duplex back-to-back, SA045FR0 duplex face-to-face, JSA045CP0 sealed radial contact, JSA045XP0 sealed four-point. Sealed variants are catalogued at this bore.