KA030AR0 Inch Thin Section Angular Contact Ball Bearing – 76.2 × 88.9 × 6.35 mm
KA030AR0 thin section bearing reference: LYDL-A030 Type A, open angular contact.
Nominal d × D × B: 3 × 3.5 × 0.25 in (76.2 × 88.9 × 6.35 mm).
Three-inch cartridge planning for controlled axial positioning.
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.
Three-inch cartridge planning for controlled axial positioning
The KA030AR0 thin section bearing reference is the three-inch open angular-contact size with a 76.2 mm bore, 88.9 mm outside diameter and 6.35 mm width. Its selection question is often the bearing cartridge: how a small axial stack is retained, adjusted and removed. This LYDL inquiry page provides dimensions, attributed load data and brand nomenclature while keeping cartridge performance subject to the installation drawing. Dimensions · Load ratings · Brand names · Model FAQ
LYDL open Type A family reference photo used for the KA030AR0 size presentation; this is not a verified photograph of an individual KA030AR0 unit.
Design the cartridge around the seating surfaces
A cartridge outer diameter is not the bearing outside diameter. Allow housing wall thickness, fastening features and machining access beyond the 88.9 mm seat. At the inner ring, check that the shaft shoulder supports the intended ring face without touching the cage. The nominal width alone does not define the required shoulder geometry or corner radius; obtain the proposed supply drawing.
Axial positioning depends on the full stack of shaft, bearing, spacers, retainers and housing faces. Describe the allowable assembled movement and measurement load rather than requesting an unexplained ‘zero play’ condition. Excessive clamping may change preload and friction. A factory-adjusted pair, if required, should be specified as a separate configuration with its orientation and inspection basis.
Kaydon KA030AR0 reference load ratings
Kaydon reference rating
lbf
kN (converted)
Dynamic radial — Kaydon method
507
2.255
Dynamic radial — ISO comparison
1,225
5.449
Dynamic thrust
1,230
5.471
Static radial
1,140
5.071
Static thrust
3,290
14.635
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-A030 Type A
Inquiry identity for KA030AR0; supply specification requires confirmation.
KAYDON
KA030AR0
Official open Type A model with dimensions and loads listed above.
INA / Schaeffler
CSEA 030
Same nominal angular-contact envelope in catalog 575; configuration must be checked.
NSK
NBA7606
NBA angular-contact catalog entry for the nominal envelope; tolerances and internals may differ.
SKF
Kaydon KA030AR0 within SKF range
SKF/Kaydon naming context, not a separately verified interchangeable SKF design.
Kaydon uses A for angular contact in KA030AR0; 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.
Serviceable support for an instrument cartridge
An instrument rotor is an example where assembly repeatability may matter more than maximum catalog capacity. Record the speed range, radial load, one-way thrust and permitted warm-up drift. Include how often the cartridge is removed for service. A removable sleeve may simplify maintenance, but each additional mating interface introduces its own tolerance contribution. Select the arrangement from the assembled accuracy target, not from the AR0 suffix alone.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)
KA030AR0
3
3.5
0.25
KA020AR0
2
2.5
0.25
KA040AR0
4
4.5
0.25
KA050AR0
5
5.5
0.25
KA020AR0 uses a smaller two-inch shaft interface, while KA040AR0 moves to four inches; both preserve the KA section. For a five-inch opening, KA050AR0 requires a new cartridge envelope. These bore steps are geometry choices, not sequential precision grades or ready-made performance upgrades.
Related model details: KA020AR0, KA040AR0, KA050AR0.
Browse the inch Type A size overview or the open angular-contact category. For the same nominal envelope with radial contact, review KA030CP0; changing contact type requires an arrangement review.
Make disassembly possible without raceway damage
Provide access for the extraction tool to act on the fitted ring. Pulling a press-fitted ring through the rolling elements can damage an otherwise serviceable bearing. Before final assembly, clean the seats and check burrs near the retention groove. After fitting, compare rotation with the agreed acceptance method. A tight spot can originate in a distorted housing or uneven clamping, so do not assume a change in bearing precision class alone will correct it.
Supply identification, inspection and protection
A spare cartridge program benefits from labels that separate the bearing reference from the finished cartridge revision. Ask LYDL to identify the supplied configuration and traceability documentation in the quotation. Keep bearings protected until the clean assembly stage. Any measurement record should distinguish unmounted bearing results from the final instrument’s system-level accuracy.Illustrative inspection and packing scenes, not an order-specific test report.
KA030AR0 selection questions
Is KA030AR0 the right nominal size for a 75 mm shaft?
The catalog bore is 76.2 mm. A 75 mm seat is a different nominal size; its suitability cannot be established by treating the 1.2 mm diameter difference as clearance.
Does the final 0 guarantee my instrument’s assembled accuracy?
It is part of Kaydon’s reference coding, not a LYDL system-accuracy guarantee or an ISO P0 claim. Specify allowable mounted runout and the agreed inspection conditions separately.
Can two KA030AR0 bearings be clamped until all movement disappears?
Uncontrolled clamping is not a preload specification. Define the arrangement, preload or clearance target and measurement procedure so friction, heat and ring deformation can be assessed.
What is the NSK angular-contact designation for this envelope?
NSK catalog 1153 lists NBA7606 with 76.2 × 88.9 × 6.35 mm dimensions. NBC and NBX are different contact families and should not be substituted solely because a size appears similar.
Which cartridge information is most useful for a quotation?
Send a section drawing showing shoulders, spacers, retainers and extraction access, together with the permitted axial movement. State whether the inquiry is for single bearings or a matched arrangement.
Request your KA030AR0 drawing and quotation
Identify the inquiry as LYDL-A030 Type A, KA030AR0 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.
