FAGThin Section Angular Contact Ball Bearing, 4.000 x 4.625 x 0.3125 in, 5/16 x 5/16 in Square Section, Open

Product Description

What this part is

FAG L15RA400YP, a thin section angular contact ball bearing. Bore: 4.000 in (101.60 mm). Outside Diameter: 4.625 in (117.48 mm). Width: 5/16 in (0.3125 in, 7.94 mm). Cross Section: 5/16 x 5/16 in square. Contact Angle: 30°. Precision Class: ABEC 1. Cage Material: brass. Cage Type: one-piece machined circular pocket separator. Rolling Elements: 5/32 in balls, single row. Closure Type: open. It is the Type A angular contact execution of the inch thin section envelope, and the direct equivalent of Kaydon KB040AR0 and Silverthin SB040AR0.

Decoding the designation

L — thin section bearing family.

15 — cross-section code for the 5/16 x 5/16 in square section, matching the Kaydon KB and Silverthin B sections.

R — open, with a retainer.

A — Type A angular contact, single row, thrust-capable in one direction.

400 — bore in hundredths of an inch, giving 4.000 in.

YP — one-piece machined pocket-type brass separator, the construction the trailing R0 denotes in Kaydon KB040AR0.

Published performance data

Dynamic Radial Load Rating: 865 lbf by the Kaydon method, 1,934 lbf calculated per ISO 281.

Dynamic Thrust Load Rating: 2,100 lbf.

Static Radial Load Rating: 2,040 lbf.

Static Thrust Load Rating: 5,890 lbf.

All four capacities are per bearing and are not simultaneous. Combined radial and thrust loading is checked against a combined-load calculation.

Mass: 0.300 lb (0.136 kg).

Mounting data

Land Diameter L1: 4.231 in. Land Diameter L2: 4.393 in. Counterbore Diameter L3: 4.460 in.

Maximum Shaft Or Housing Fillet Radius Cleared: 0.040 in.

Radial Section Thickness: 0.3125 in (7.94 mm).

Bearing corners are normally chamfered. Thin rings take the form of whatever they are clamped into, so housing bores and shaft seats are machined round and flat to a tighter standard than a conventional bearing seat, the surrounding structure is rigid, and clamping load is applied uniformly around the circumference.

What these specs mean in practice

Thin section bearings hold the ring section constant as the bore grows, so a large-diameter bearing stays shallow and light. That is why they dominate designs where a rotating joint has to pass a cable, hollow shaft or optical path through the middle: robotic joints and rotary axes, index and rotary tables, medical imaging gantries, optical and radar mounts, packaging machinery and semiconductor handling.

Static radial capacity above dynamic radial capacity is normal in large thin-section geometry. The static figure is a non-brinell limit under rigid shaft and housing support; the dynamic figure is an L10 rating at one million revolutions.

Type A angular contact carries thrust in one direction and requires applied thrust to establish its contact angle. Reversing thrust is served by a duplex pair, BR0 back-to-back or FR0 face-to-face, or by a four-point contact XP0.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing, open both faces.

Interchange guidance

Direct equivalents: Kaydon KB040AR0, Silverthin SB040AR0, INA CSEB040. FAG and INA are both Schaeffler Group brands. Searchable variants: L15RA400YP, L15RA400-YP, L15RA400 YP, L15RA400.

Related sizes with a different section or contact geometry: the 1/4 x 1/4 in section L15QA series, and the CP0 radial-contact and XP0 four-point executions on the same envelope.