KC040AR0 Inch Thin Section Angular Contact Ball Bearing – 101.6 × 120.65 × 9.525 mm
KC040AR0 thin section bearing reference: LYDL-C040 Type A, open angular contact.
Nominal d × D × B: 4 × 4.75 × 0.375 in (101.6 × 120.65 × 9.525 mm).
Four-inch KC support: distinguish bearing capacity from overturning stiffness.
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.
Four-inch KC support: distinguish bearing capacity from overturning stiffness
The KC040AR0 thin section bearing reference has a 101.6 mm bore and a three-eighths-inch section, with a 120.65 mm outside diameter and 9.525 mm width. This open angular-contact size is a candidate for evaluating a thicker section around a fixed four-inch shaft. An offset payload introduces a separate question: how the complete bearing arrangement resists the resulting moment. Dimensions · Load ratings · Brand names · Model FAQ
LYDL open Type A family reference photo used for the KC040AR0 size presentation; this is not a verified photograph of an individual KC040AR0 unit.
Resolve an offset force through the support geometry
A radial or axial force applied away from the support center produces an overturning moment. Record both the force and its lever arm. For a pair of bearings, the spacing and arrangement affect the reaction forces and tilting behavior. A single catalog capacity does not supply an assembly moment rating, and a thicker section alone does not define pointing stiffness.
The KC envelope provides more section than the KA and KB alternatives at this bore, but the surrounding hardware still matters. Check housing wall stiffness, fastening and shaft support. If the housing flexes under the same offset load, a change of bearing size may not produce the expected system improvement. Review the mechanical structure alongside the bearing candidates.
Kaydon KC040AR0 reference load ratings
Kaydon reference rating
lbf
kN (converted)
Dynamic radial — Kaydon method
1,153
5.129
Dynamic radial — ISO comparison
2,520
11.210
Dynamic thrust
2,770
12.322
Static radial
2,550
11.343
Static thrust
7,360
32.739
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-C040 Type A
Inquiry identity for KC040AR0; supply specification requires confirmation.
KAYDON
KC040AR0
Official open Type A model with dimensions and loads listed above.
INA / Schaeffler
CSEC 040
Same nominal angular-contact envelope in catalog 575; configuration must be checked.
NSK
NBA10109
NBA angular-contact catalog entry for the nominal envelope; tolerances and internals may differ.
SKF
Kaydon KC040AR0 within SKF range
SKF/Kaydon naming context, not a separately verified interchangeable SKF design.
Kaydon uses A for angular contact in KC040AR0; 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.
Offset tooling on a rotary fixture
A rotary fixture carrying a tool away from its axis is an illustrative use case. Describe the tool mass, center of gravity, working forces and acceleration. Separate static holding conditions from motion and emergency stopping. If working force direction changes through the rotation, identify the worst combinations rather than providing only an average load. The application image is general; it is not a case study confirming this model in a particular fixture.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)
KC040AR0
4
4.75
0.375
KA040AR0
4
4.5
0.25
KB040AR0
4
4.625
0.3125
KC050AR0
5
5.75
0.375
KA040AR0 and KB040AR0 offer smaller four-inch outer envelopes, at 114.3 and 117.475 mm respectively. KC050AR0 preserves the three-eighths-inch section but increases the bore to five inches. Compare section and bore changes separately before evaluating the resulting support layout.
Related model details: KA040AR0, KB040AR0, KC050AR0.
Browse the inch Type A size overview or the open angular-contact category. For the same nominal envelope with radial contact, review KC040CP0; changing contact type requires an arrangement review.
Preserve the designed distance between reaction points
When an opposed arrangement is selected, show the support spacing and spacer tolerances on the drawing. Check face contact and the retaining hardware before applying the agreed adjustment procedure. A change in spacer length or bearing width can affect the whole arrangement. Request drawing confirmation when replacing a different series rather than assuming that a common four-inch bore preserves the support geometry.
Supply identification, inspection and protection
For a fixture build, the order can specify which dimensional checks and traceability records are required at acceptance. Keep the nominal bearing reference separate from the fixture’s own accuracy specification. Protective packaging should prevent contamination of the open construction and avoid contact damage to precision mounting faces.Illustrative inspection and packing scenes, not an order-specific test report.
KC040AR0 selection questions
Does KC040AR0 have a moment rating in this table?
No. The published reference rows are radial and thrust capacity values. A permissible assembly moment requires the bearing arrangement, reaction spacing, mounting stiffness and operating load case.
Will the thicker KC section guarantee better fixture accuracy?
Not by itself. Mounted accuracy and stiffness depend on bearing configuration, seats, preload, structure and inspection conditions. State the required fixture performance for an application review.
What are the official INA and NSK naming references?
The cited catalogs list INA CSEC 040 and NSK NBA10109 for the 101.6 × 120.65 × 9.525 mm angular-contact envelope. This supports a nominal comparison, not unconditional interchangeability.
Why must I give the tool’s distance from the bearing?
That offset determines the moment generated by a given force. Without it, an important part of the support loading may be missing from the selection inputs.
Can the KA040 retaining stack be reused with KC040?
The KC bearing is 3.175 mm wider and has a 6.35 mm larger outside diameter. Recheck the housing, spacers, shoulders and adjustment range using the final drawing.
Request your KC040AR0 drawing and quotation
Identify the inquiry as LYDL-C040 Type A, KC040AR0 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.
