KA050AR0 Inch Thin Section Angular Contact Ball Bearing – 127 × 139.7 × 6.35 mm
KA050AR0 thin section bearing reference: LYDL-A050 Type A, open angular contact.
Nominal d × D × B: 5 × 5.5 × 0.25 in (127 × 139.7 × 6.35 mm).
A five-inch opening with a quarter-inch angular-contact section.
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.
A five-inch opening with a quarter-inch angular-contact section
The KA050AR0 thin section bearing reference provides a 127 mm bore within a 139.7 mm outside diameter and 6.35 mm axial width. This open Type A envelope is relevant when a hollow rotary assembly needs a five-inch shaft interface and limited space outside it. Axial force direction and the opposing support matter as much as the opening size; this page separates those decisions from catalog reference loads. Dimensions · Load ratings · Brand names · Model FAQ
LYDL open Type A family reference photo used for the KA050AR0 size presentation; this is not a verified photograph of an individual KA050AR0 unit.
Allocate space beyond the hollow passage
The 127 mm dimension identifies the bearing bore, not the usable cable passage after a hollow shaft is installed. Shaft wall thickness, connectors and service clearance reduce the available opening. Reserve additional room for retaining hardware and external protection before committing to the 139.7 mm bearing outer diameter. A complete module will occupy more than the bearing envelope.
For this five-inch design, describe both normal operation and temporary assembly loads. Pulling cables or attaching a tool can reverse the axial force even when the normal operating load is unidirectional. Determine how that reversal is resisted. If an opposing bearing is used, its mounting position controls support spacing and influences the stiffness of the resulting assembly.
Kaydon KA050AR0 reference load ratings
Kaydon reference rating
lbf
kN (converted)
Dynamic radial — Kaydon method
676
3.007
Dynamic radial — ISO comparison
1,463
6.508
Dynamic thrust
1,690
7.517
Static radial
1,840
8.185
Static thrust
5,310
23.620
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-A050 Type A
Inquiry identity for KA050AR0; supply specification requires confirmation.
KAYDON
KA050AR0
Official open Type A model with dimensions and loads listed above.
INA / Schaeffler
CSEA 050
Same nominal angular-contact envelope in catalog 575; configuration must be checked.
NSK
NBA12706
NBA angular-contact catalog entry for the nominal envelope; tolerances and internals may differ.
SKF
Kaydon KA050AR0 within SKF range
SKF/Kaydon naming context, not a separately verified interchangeable SKF design.
Kaydon uses A for angular contact in KA050AR0; 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.
Hollow-shaft selection with service access
Consider a rotary cable-routing module as a design example. The large central interface can simplify routing, but the bearing itself does not manage cable twist, slip-ring clearance or electrical isolation. List rotational travel, starts and stops, allowable torque and heat sources around the seat. Continuous rotation and intermittent indexing need different duty descriptions. Suitability requires a review of these inputs; no speed limit or service-life promise is inferred from the five-inch size.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)
KA050AR0
5
5.5
0.25
KA040AR0
4
4.5
0.25
KA060AR0
6
6.5
0.25
KB050AR0
5
5.625
0.3125
KA040AR0 reduces the bore to 101.6 mm; KA060AR0 enlarges it to 152.4 mm while preserving the quarter-inch section. KB050AR0 maintains a 127 mm bore but needs a 142.875 mm housing seat and greater axial width. None changes into a duplex assembly simply by selecting a larger section.
Related model details: KA040AR0, KA060AR0, KB050AR0.
Browse the inch Type A size overview or the open angular-contact category. For the same nominal envelope with radial contact, review KA050CP0; changing contact type requires an arrangement review.
Preserve access to the axial adjustment
A compact housing may hide the retaining feature behind the cable assembly. Plan the installation sequence so axial adjustment and inspection remain accessible. Mark the intended thrust direction on the assembly drawing, then confirm the purchased configuration supports it. Specify the lubrication and any external seal arrangement before calculating the total axial stack. An open bearing has no integral sealing function to protect the cable compartment from lubricant or contaminants.
Supply identification, inspection and protection
For this size, identify whether shipment contains individual bearings or an agreed matched set. If paired, require the packing and labels to preserve set identity and orientation. The quotation can also define corrosion protection and storage instructions. Handling and test illustrations are general examples; a batch inspection report must be requested and tied to the actual supply order.Illustrative inspection and packing scenes, not an order-specific test report.
KA050AR0 selection questions
Is the full 127 mm bore available for cable routing?
Only before a shaft or sleeve is installed. The usable passage is determined by the hollow shaft wall, connectors and service clearances, not by the bearing bore alone.
Does KA050AR0 include a seal for the cable chamber?
The reference construction is open. Contamination control and lubricant separation require a suitable external protection system specified as part of the assembly.
Can I use the listed thrust rating as the permissible payload?
No. The table contains catalog reference capacities, not a direct working-load limit. Payload offset, duty cycle, preload, support stiffness and the combined load case must be evaluated.
What changes if I choose KB050AR0 instead?
The bore remains 127 mm, but the outside diameter grows by 3.175 mm and the width by 1.5875 mm. Recheck the housing and retention stack; it is not a size-identical substitution.
Which naming references belong with this five-inch inquiry?
Kaydon KA050AR0, INA CSEA 050 and NSK NBA12706 describe catalog references for the same nominal angular-contact envelope. SKF’s Kaydon range is a related brand context, not a separately verified fourth interchangeable design.
Request your KA050AR0 drawing and quotation
Identify the inquiry as LYDL-A050 Type A, KA050AR0 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.
