FAGThin Section Angular Contact Ball Bearing, 4.250 x 4.750 x 0.250 in, 1/4 x 1/4 in Square Section, Open

Product Description

What this part is

FAG L15QA404YP, a thin section angular contact ball bearing. Bore: 4.250 in (107.95 mm). Outside Diameter: 4.750 in (120.65 mm). Width: 1/4 in (0.250 in, 6.35 mm). Cross Section: 1/4 x 1/4 in square. Contact Angle: 30°. Precision Class: ABEC 1. Cage Material: brass. Cage Type: one-piece machined circular pocket separator. Rolling Elements: 1/8 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 KA042AR0.

Decoding the designation

L — thin section bearing family.

15 — thin section series.

Q — 1/4 x 1/4 in square cross section, matching the Kaydon KA section.

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

404 — bore code, giving 4.250 in.

YP — one-piece machined pocket-type brass separator, the construction the trailing R0 denotes in Kaydon KA042AR0.

Published performance data

Dynamic Radial Load Rating: 616 lbf by the Kaydon method, 1,382 lbf calculated per ISO 281.

Dynamic Thrust Load Rating: 1,530 lbf.

Static Radial Load Rating: 1,580 lbf.

Static Thrust Load Rating: 4,550 lbf.

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

Mass: 0.200 lb (0.091 kg).

Mounting data

Land Diameter L1: 4.436 in. Land Diameter L2: 4.564 in. Counterbore Diameter L3: 4.615 in.

Maximum Shaft Or Housing Fillet Radius Cleared: 0.025 in.

Radial Section Thickness: 0.250 in (6.35 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 regardless of bore, so a large-diameter bearing stays shallow and light. That is why they dominate designs where a rotating joint has to pass a cable, shaft or optical path through the middle: robotic joints and rotary axes, index and rotary tables, medical imaging gantries, optical and radar mounts, semiconductor handling and aerospace actuation.

The 1/4 in section is the shallowest of the standard inch thin sections, running 1/8 in balls against the 5/32 in balls of the 5/16 in section, which is what puts its capacities below the L15RA range on a similar diameter.

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 or by a four-point contact execution.

Quantity and configuration

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

Interchange guidance

Direct equivalent: Kaydon KA042AR0. Also carried on the carton as INA CSEA042 and NSK NBA10706. FAG and INA are both Schaeffler Group brands. Searchable variants: L15QA404YP, L15QA404-YP, L15QA404 YP, L15QA404.

Related sizes with a different section or contact geometry: the 5/16 x 5/16 in section L15RA series, and the CP0 radial-contact and XP0 four-point executions on the same envelope.