KA020AR0 Inch Thin Section Angular Contact Ball Bearing – 50.8 × 63.5 × 6.35 mm
KA020AR0 thin section bearing reference: LYDL-A020 Type A, open angular contact.
Nominal d × D × B: 2 × 2.5 × 0.25 in (50.8 × 63.5 × 6.35 mm).
Compact two-inch angular contact selection with external protection.
Single-bearing thrust support is directional; pairing and preload are separate specifications.
Kaydon reference loads are shown with attribution; LYDL supply capacities require confirmation.
Request the proposed drawing and quotation with quantity and application details.
Compact two-inch angular contact selection with external protection
The KA020AR0 thin section bearing reference measures 50.8 × 63.5 × 6.35 mm and represents an open Type A bearing for a two-inch nominal shaft. Within this batch it offers the smallest bore. Selection should focus on axial force direction, limited installation space and how the surrounding mechanism protects an open bearing, rather than assuming a small ring can be treated as a sealed general-purpose bearing. Dimensions · Load ratings · Brand names · Model FAQ
LYDL open Type A family reference photo used for the KA020AR0 size presentation; this is not a verified photograph of an individual KA020AR0 unit.
Small envelope, complete load path
Sketch the force path from the moving component through the bearing rings to the housing. In a compact mechanism, a retaining clip or thin cover may become the limiting element before the catalog bearing capacity is reached. Include those parts in the review. The 6.35 mm bearing width excludes cover thickness and assembly clearance, so leave room for the complete retention system.
One Type A unit supports axial load in a specified direction. If a handle, belt adjustment or transport shock reverses the thrust, the opposing reaction must be supplied by the complete design. The rating table cannot decide whether a second bearing is needed. Avoid replacing a bidirectional arrangement with a single angular-contact bearing simply to shorten the axial stack.
Kaydon KA020AR0 reference load ratings
Kaydon reference rating
lbf
kN (converted)
Dynamic radial — Kaydon method
405
1.802
Dynamic radial — ISO comparison
1,065
4.737
Dynamic thrust
960
4.270
Static radial
790
3.514
Static thrust
2,280
10.142
These figures are Kaydon catalog reference capacities, not verified LYDL supply ratings. Dynamic ratings use a one-million-revolution L10 basis; the radial ISO comparison follows ISO 281:1990. Static values assume rigid supporting members. Do not add these ratings, treat them as simultaneous permissible loads or double them to rate a pair. Conversion: 1 lbf = 0.0044482216152605 kN; displayed values are rounded.
KAYDON, INA, NSK and SKF naming comparison
Brand
Reference or naming context
What is established
LYDL
LYDL-A020 Type A
Inquiry identity for KA020AR0; supply specification requires confirmation.
KAYDON
KA020AR0
Official open Type A model with dimensions and loads listed above.
INA / Schaeffler
CSEA 020
Same nominal angular-contact envelope in catalog 575; configuration must be checked.
NSK
NBA5006
NBA angular-contact catalog entry for the nominal envelope; tolerances and internals may differ.
SKF
Kaydon KA020AR0 within SKF range
SKF/Kaydon naming context, not a separately verified interchangeable SKF design.
Kaydon uses A for angular contact in KA020AR0; R identifies a circular-pocket ring cage code, and the final 0 is a separate reference precision code. It is not an LYDL ISO P0 claim. INA uses the CSE angular-contact family, while NSK uses NBA. NSK nominal widths may be rounded in its metric table. SKF/Kaydon documentation also shows the KDN. brand-prefix format; the complete order designation and suffixes require confirmation. Equal nominal dimensions do not prove identical contact geometry, preload, cage, tolerances or life. Brand references do not imply authorization or current availability.
Protection choices for a compact positioning mechanism
A small positioning module may operate close to dust from nearby components. The open construction gives the designer responsibility for lubricant retention and contamination exclusion. Select guards or seals from the exposure, allowable drag and maintenance interval. Seals can consume space and add friction, so they should be considered before the module envelope is frozen. The photograph is a Type A family illustration and does not show an installed protection system.General application examples; suitability and performance require review of the actual machine.
Compare related Type A mounting envelopes
Reference
Bore d (in)
Outside D (in)
Width B (in)
KA020AR0
2
2.5
0.25
KA030AR0
3
3.5
0.25
KA040AR0
4
4.5
0.25
KA050AR0
5
5.5
0.25
KA030AR0 adds a larger three-inch interface without changing the quarter-inch section. KA040AR0 and KA050AR0 require still larger shaft and housing seats. Moving upward through this group preserves the contact family, but it does not preserve the cartridge, available through-space or reference load capacities.
Related model details: KA030AR0, KA040AR0, KA050AR0.
Browse the inch Type A size overview or the open angular-contact category. For the same nominal envelope with radial contact, review KA020CP0; changing contact type requires an arrangement review.
Avoid tool contact with the cage
Use an installation sleeve that contacts the appropriate ring face and clears the cage. Keep the ring square to the seat while applying the specified fit procedure. Do not use the cage as a convenient gripping surface. For a small assembly, document how the axial orientation remains visible after insertion so a technician cannot reverse the intended support direction during maintenance.
Supply identification, inspection and protection
Request individual clean packaging if bearings will be issued to assembly stations one at a time. Specify storage duration and destination conditions so protection can be agreed. Inspection requirements may include the nominal interface dimensions and an agreed rotational check; they should not be inferred from a generic packing photograph or an unverified stock description.Illustrative inspection and packing scenes, not an order-specific test report.
KA020AR0 selection questions
Is KA020AR0 a 50 mm metric bearing?
No. Its two-inch bore converts to 50.8 mm, with a 63.5 mm outside diameter. Confirm the actual nominal shaft size before considering tolerances.
Can this small Type A bearing carry thrust both ways by itself?
A single unit is a one-direction axial support. Reverse thrust needs an appropriate opposing support or another deliberately selected arrangement.
Does a protective shipping coating replace operating lubrication?
Do not assume that it does. Confirm the lubricant supplied, whether cleaning is required and the lubrication specified for the actual application before installation.
Which INA designation matches the two-inch angular-contact envelope?
The cited Schaeffler catalog lists CSEA 020 at 50.8 × 63.5 × 6.35 mm. The corresponding reference dimensions alone do not certify compatibility of preload, cage or tolerances.
How should I describe a dust-exposed KA020AR0 application?
State the contaminant, operating motion, available seal space and maintenance interval. Include external protection in the drawing review because the open bearing contains no integral seal.
Request your KA020AR0 drawing and quotation
Identify the inquiry as LYDL-A020 Type A, KA020AR0 reference. Send quantity, destination and the available assembly drawing. Specify single-bearing or matched-set requirements, load directions and any acceptance documentation needed. LYDL supply loads, contact geometry, accuracy, cage and delivery conditions must be confirmed for the quoted configuration.
