LYDL bearing assortment with thin section, geared and flanged bearing designs

KA050CP0 Thin Section Bearing Reference – Open Type C

KA050CP0 thin section bearing reference: LYDL-A050 Type C, open radial-contact thin section bearing.
Nominal d × D × B: 5 × 5.5 × 0.25 in (127 × 139.7 × 6.35 mm).
KA family with 0.25-inch radial section and axial width; housing and retainers require separate space.
Five-inch opening for a hollow rotary spindle.
Kaydon reference dynamic and static radial loads are separately identified in the detail table; LYDL ratings require supply confirmation.
Request a quote with quantity, application and destination; provide mounting requirements for drawing review.

Five-inch opening for a hollow rotary spindle

The KA050CP0 thin section bearing reference combines a 127 mm nominal bore with a 139.7 mm outside diameter and 6.35 mm width. It belongs to the open radial-contact Type C range. Specify LYDL-A050 Type C together with KA050CP0 when asking for a quotation for a hollow spindle or comparable radial-support arrangement.

Dimensions · Reference loads · Model comparison · FAQ

KA050CP0 thin section bearing dimensions

Parameter	Symbol	in	mm
Bore diameter	d	5	127
Outside diameter	D	5.5	139.7
Axial width	B	0.25	6.35
Radial section	(D − d) / 2	0.25	6.35

Preserving width while enlarging the central opening

Relative to the four-inch KA size, the bore and outer diameter both increase by one inch, while the axial bearing width remains unchanged. This can help when the central route needs more room for a shaft, service tube or optical path. The clear passage through the finished mechanism will still depend on the shaft wall, shoulders and components inside it. A five-inch bore does not automatically require the thicker KB, KC or KD section. Those options retain the nominal shaft diameter but enlarge the outer seat and axial stack. Select the available installation volume first, then check the actual reactions and motion requirements against the proposed supply configuration.

Kaydon KA050CP0 reference load ratings

Reference rating	lbf	kN (converted)
Dynamic radial — Kaydon method	648	2.882
Dynamic radial — ISO comparison	1,394	6.201
Static radial	1,590	7.073

Source: Kaydon official model table, referenced below. These are Kaydon reference capacities, not verified LYDL supply ratings. Dynamic values use a one-million-revolution L10 basis; the ISO column is a comparison rating calculated per ISO 281:1990. Static values assume rigid shaft and housing support. Ratings are not additive or simultaneous permissible loads. Conversion: 1 lbf = 0.0044482216152605 kN; displayed kN values are rounded.

Brand designations for this nominal envelope

Brand	Designation	Scope
LYDL	LYDL-A050 Type C	Supply inquiry identity
Kaydon	KA050CP0	Open radial-contact reference
Silverthin	SA050CP0	Same nominal size and contact family
INA / Schaeffler	CSCA050	CSC catalog radial-contact reference

KA050CP0, SA050CP0 and CSCA050 identify brand-specific references for the 5 × 5.5 × 0.25 in radial-contact envelope. INA / Schaeffler uses CSC for the Conrad radial family; its following letter identifies the section. Compare the complete specification before interchange. Brand names remain with their owners; this LYDL offer does not imply brand authorization. Catalog references do not guarantee current availability.

Discuss your size and configuration

Send KA050CP0, quantity and the application to begin a quotation. Where an existing assembly must be preserved, identify its fixed interfaces and include the available drawing. A complete analysis is not required to start the commercial inquiry.

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Routing services through a rotating mechanism

A hollow rotating spindle can carry cables or pneumatic tubing through its center, provided the surrounding design manages bending, clearance and relative motion. Keep the service bundle away from moving retention parts. The bearing’s nominal hole size is only one boundary in that routing study. If the outer ring rotates with a pulley or drum, explain that explicitly in the inquiry. The rotating load relationship affects mounting decisions, and a drawing should identify which parts remain stationary. This application discussion describes a design possibility rather than evidence that a particular machine uses this LYDL size.

Illustrations of thin-section-bearing application contexts — General application illustration; suitability of this model depends on the actual machine design.

Related sizes and installation envelopes

Reference	Bore d (in)	Outside D (in)	Width B (in)
KA050CP0	5	5.5	0.25
KA040CP0	4	4.5	0.25
KB050CP0	5	5.625	0.3125
KC050CP0	5	5.75	0.375

KA040CP0 narrows both bearing diameters. KB050CP0 and KC050CP0 retain the five-inch nominal bore but add section thickness. Their housing seats are therefore different even when the same shaft diameter appears in every quotation. Compare the installation dimensions of KA040CP0, KB050CP0, KC050CP0. Explore the open Type C size table and radial-contact bearing category. For another contact arrangement, see the KA050XP0 four-point contact reference.

Review shoulders before machining the housing

The 139.7 mm outside diameter is the bearing envelope, not a finished housing tolerance. The housing drawing also needs support shoulders and corner relief appropriate to the actual bearing drawing. Treat a shoulder rubbing against a rotating part as a geometry problem, not as something to solve by changing grease. After the assembly layout is settled, agree the required clearance, lubrication and accuracy. For repeated start-stop duty, provide acceleration and cycle frequency as well as rotational speed. A maximum speed copied from a differently configured bearing would not resolve this duty specification.

Inspection, handling and packing

A five-inch ring should be protected from edge contact during stacking and unpacking. Specify corrosion protection compatible with the planned cleaning and lubrication procedure, so the receiving team does not have to guess whether a protective coating may remain in service.

General bearing inspection and protective packaging illustration — Illustrative packing and inspection scenes; order-specific protection and records are agreed separately.

Questions about this model

Is the entire 127 mm bore available for cables?

Only if the surrounding assembly leaves it clear. A hollow shaft, retaining hardware and cable guides consume some of that opening. Use the bearing bore as an envelope dimension, then calculate usable passage from the complete section drawing.

Can the outer ring rotate in a pulley?

Describe the pulley, stationary shaft and load direction when requesting selection support. The bearing reference alone does not define the necessary ring fits, retention or clearance for that rotating arrangement.

Is KA050CP0 6.35 mm wide including its cover?

The 6.35 mm value is the bearing width. A separate cover, retaining ring or external seal adds to the axial stack; none is included in that nominal dimension.

Can a KB050CP0 be installed in the same 139.7 mm housing seat?

Its nominal outside diameter is 142.875 mm, so it needs a different seat. It is also 7.9375 mm wide. Sharing a 127 mm bore does not make the installation envelopes interchangeable.

What information helps with start-stop operation?

Include acceleration, stopping frequency, radial force and operating temperature. Also describe how lubricant reaches the raceways during the cycle. A single rotational-speed number cannot describe the full operating duty.

Request a quote for KA050CP0

Include “LYDL-A050 Type C, KA050CP0 reference,” quantity and delivery destination. Add the required load case, speed and installation drawing when available. Ask for a drawing review if the shaft, housing or retention geometry must match an existing assembly.