KC050AR0 Inch Thin Section Angular Contact Ball Bearing – 127 × 146.05 × 9.525 mm
KC050AR0 thin section bearing reference: LYDL-C050 Type A, open angular contact.
Nominal d × D × B: 5 × 5.75 × 0.375 in (127 × 146.05 × 9.525 mm).
Five-inch angular contact: separate intermittent motion from static holding.
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.
Five-inch angular contact: separate intermittent motion from static holding
The KC050AR0 thin section bearing reference measures 127 × 146.05 × 9.525 mm in an open Type A construction. For an indexing assembly, selecting this five-inch size requires both a motion-duty description and a holding-load description. Dynamic reference capacities, static capacities and preload serve different purposes; this page keeps them distinct so an inquiry can address the actual operating cycle. Dimensions · Load ratings · Brand names · Model FAQ
LYDL open Type A family reference photo used for the KC050AR0 size presentation; this is not a verified photograph of an individual KC050AR0 unit.
Describe the entire indexing cycle
State the angular travel, move time, acceleration, dwell and number of cycles. Add any process force applied while the mechanism is stopped. A low average rotational speed can hide significant peak forces or repeated short movements. The dynamic rating is based on a catalog life convention; it is not a direct guarantee for an intermittent or oscillating application.
Static holding also needs a load distribution assessment. Include the direction of axial thrust and whether it changes between acceleration and braking. The single Type A bearing supports one axial direction, while the machine may require reactions in both. Identify the opposing support and any locking mechanism instead of assuming the static thrust figure defines the whole machine’s holding capacity.
Kaydon KC050AR0 reference load ratings
Kaydon reference rating
lbf
kN (converted)
Dynamic radial — Kaydon method
1,313
5.841
Dynamic radial — ISO comparison
2,746
12.215
Dynamic thrust
3,200
14.234
Static radial
3,180
14.145
Static thrust
9,170
40.790
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-C050 Type A
Inquiry identity for KC050AR0; supply specification requires confirmation.
KAYDON
KC050AR0
Official open Type A model with dimensions and loads listed above.
INA / Schaeffler
CSEC 050
Same nominal angular-contact envelope in catalog 575; configuration must be checked.
NSK
NBA12709
NBA angular-contact catalog entry for the nominal envelope; tolerances and internals may differ.
SKF
Kaydon KC050AR0 within SKF range
SKF/Kaydon naming context, not a separately verified interchangeable SKF design.
Kaydon uses A for angular contact in KC050AR0; 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.
Index-and-hold motion with a process load
A five-inch rotary indexing fixture can illustrate the difference between moving and holding. During indexing, inertia may dominate; during dwell, a process tool may impose a different force and moment. Supply these cases separately, together with the required positioning behavior. The bearing assessment should consider the most relevant combinations rather than combining unrelated maxima into an unexplained single load number.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)
KC050AR0
5
5.75
0.375
KA050AR0
5
5.5
0.25
KB050AR0
5
5.625
0.3125
KC060AR0
6
6.75
0.375
KA050AR0 and KB050AR0 provide narrower sections at the same 127 mm bore. KC060AR0 preserves the KC section but moves to a larger six-inch shaft. A housing chosen for the 146.05 mm KC050 outer seat cannot be evaluated from the bore code alone.
Related model details: KA050AR0, KB050AR0, KC060AR0.
Browse the inch Type A size overview or the open angular-contact category. For the same nominal envelope with radial contact, review KC050CP0; changing contact type requires an arrangement review.
Set the axial condition before validating repeatability
Position repeatability should be checked on the assembled mechanism after its axial setting, lubrication and retention are established. Preload may affect stiffness and friction, so it must be an agreed configuration rather than a field adjustment made until the mechanism feels tight. If the machine uses a matched pair, state its arrangement and orientation on the procurement drawing and preserve set identity during assembly.
Supply identification, inspection and protection
For repeated machine builds, ask the quotation to identify the approved drawing revision and inspection scope. Incoming checks should distinguish bearing interface dimensions from machine-level indexing results. Protect the open raceways from contamination between receiving and installation; the general testing illustration does not certify a particular batch or assembled positioning result.Illustrative inspection and packing scenes, not an order-specific test report.
KC050AR0 selection questions
Does a low average speed make KC050AR0 selection straightforward?
No. Acceleration, braking, short-angle motion and dwell forces can dominate an indexing cycle. Provide the full duty sequence and relevant peak loads.
Can the static thrust value be used as the fixture’s clamp force limit?
It is a bearing reference capacity under catalog assumptions, not an allowable machine clamp force. The actual load distribution, support arrangement and surrounding components require evaluation.
Is INA CSEC 050 a radial-contact bearing?
In the cited Schaeffler catalog, CSEC belongs to the CSE angular-contact family. Its designation should not be confused with the CSC radial-contact series.
What does NSK NBA12709 mean for the width?
The official table gives a 9.525 mm width for NBA12709. The abbreviated 09 identifies its naming series; it is not an instruction to machine a 9 mm axial seat.
What cycle information should be included in a quotation request?
List travel angle, move time, acceleration, dwell duration, cycles per hour and forces during each phase. Add the proposed support arrangement and required positional behavior.
Request your KC050AR0 drawing and quotation
Identify the inquiry as LYDL-C050 Type A, KC050AR0 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.
