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

KB040CP0 Thin Section Bearing Reference – Open Type C

KB040CP0 thin section bearing reference: LYDL-B040 Type C, open radial-contact thin section bearing.
Nominal d × D × B: 4 × 4.625 × 0.3125 in (101.6 × 117.475 × 7.9375 mm).
KB family with 0.3125-inch radial section and axial width; housing and retainers require separate space.
Four-inch bore with a five-sixteenths-inch section.
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.

Four-inch bore with a five-sixteenths-inch section

The KB040CP0 thin section bearing reference identifies an open radial-contact design with a 4 × 4.625 × 0.3125 in envelope. The metric dimensions are 101.6 × 117.475 × 7.9375 mm. LYDL-B040 Type C provides the full supply inquiry identity when accompanied by the KB040CP0 reference and required configuration.

Dimensions · Reference loads · Model comparison · FAQ

KB040CP0 thin section bearing dimensions

Parameter	Symbol	in	mm
Bore diameter	d	4	101.6
Outside diameter	D	4.625	117.475
Axial width	B	0.3125	7.9375
Radial section	(D − d) / 2	0.3125	7.9375

A section change while retaining the four-inch shaft

The KB family occupies more radial and axial space than KA at the same bore. For the four-inch comparison, the outer diameter grows by 3.175 mm and width by 1.5875 mm. A shaft drawing might remain nominally four inches while the housing and retention details need substantial revision. Do not hide that difference by rounding the width to 8 mm on a machining document. The exact conversion, 7.9375 mm, identifies the nominal inch size; tolerance and measurement uncertainty belong in separate specifications. This prevents purchasing shorthand from becoming an unintended drawing change.

Kaydon KB040CP0 reference load ratings

Reference rating	lbf	kN (converted)
Dynamic radial — Kaydon method	825	3.670
Dynamic radial — ISO comparison	1,827	8.127
Static radial	1,750	7.784

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-B040 Type C	Supply inquiry identity
Kaydon	KB040CP0	Open radial-contact reference
Silverthin	SB040CP0	Same nominal size and contact family
INA / Schaeffler	CSCB040	CSC catalog radial-contact reference

KB040CP0, SB040CP0 and CSCB040 identify brand-specific references for the 4 × 4.625 × 0.3125 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 KB040CP0, 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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A stepped radial-support cartridge

In a cartridge redesign, an engineer may retain the existing shaft but change the ring section to suit a revised support concept. Check available housing-wall thickness after enlarging the seat to 117.475 mm. Fastener engagement, shoulder support and nearby cavities can limit that change even when the overall housing diameter is unchanged. The cartridge example is an engineering scenario rather than a verified installation. Actual radial loads and life targets must be evaluated with the chosen configuration. A larger section and a higher reference capacity do not automatically validate the original housing structure.

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)
KB040CP0	4	4.625	0.3125
KA040CP0	4	4.5	0.25
KC040CP0	4	4.75	0.375
KB050CP0	5	5.625	0.3125

KA040CP0 and KC040CP0 keep the four-inch bore with smaller and larger sections respectively. KB050CP0 keeps the KB section while increasing the bore by one inch. The table separates a section revision from an aperture revision. Compare the installation dimensions of KA040CP0, KC040CP0, KB050CP0. Explore the open Type C size table and radial-contact bearing category. For another contact arrangement, see the KB040XP0 four-point contact reference.

Control the cartridge interfaces as a matched drawing set

Issue the shaft, housing and retaining-cover details together so the workshop can identify which dimensions changed from a KA design. Pay particular attention to the bearing seat depth and the surfaces that locate the ring axially. An outer diameter adjustment alone is insufficient. For final checks, state the temperature, support arrangement and allowable running behavior. Avoid using a fit chosen for a much thicker conventional bearing without evaluating the thin-ring assembly. The supplier should review the proposed configuration against the actual operating conditions.

Inspection, handling and packing

Label this five-sixteenths-inch section clearly in mixed-size shipments. Four-inch KA, KB and KC rings can be confused when unpacked together, so preserve model-specific separators and paperwork through incoming inspection.

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

Questions about this model

Can I keep the four-inch shaft when changing from KA040CP0?

The nominal bore agrees at 101.6 mm, but the actual shaft fit still needs review for the selected configuration. The outer seat and axial stack definitely change because the KB section is thicker.

Is 7.9375 mm an unusually tight width tolerance?

It is an exact conversion of the nominal 0.3125-inch width, not a tolerance statement. The permitted deviation must come from the agreed drawing and inspection specification.

How much larger is the housing seat than for KA040CP0?

The nominal outside diameter increases from 114.3 to 117.475 mm, a 3.175 mm diameter increase. Assess the remaining housing wall and support features before enlarging an existing seat.

Does the higher Kaydon reference rating approve my old housing?

No. The capacity data carries assumptions about support and loading. The old housing must still be checked for geometry, deformation and the revised load case; a catalog number cannot certify the surrounding parts.

How do I prevent mix-ups in a four-inch bearing kit?

Keep KA, KB and KC items identified by full reference and width. Retain individual labels during inspection and assembly, since a shared bore can make different sections appear interchangeable at first glance.

Request a quote for KB040CP0

Include “LYDL-B040 Type C, KB040CP0 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.