Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
When a motor stops running, the first instinct is to find the part that looks
Availability:
1 in stock
Thin section angular contact ball bearing, 4.500 in bore x 5.000 in outside diameter x 1/4 in wide, square 1/4 x 1/4 in cross section. Type A single row taking thrust in one direction only, open with a one-piece machined brass separator, ABEC 1.
List Price
$551.20
1 in stock
1 in stock
On the Shelf & Ready to Ship
On all orders
No Risk, No Hassle
Also Available From:
| MFR / Brand | FAG |
|---|---|
| Model | L15QA408 YP / KA045ARO |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 4.5 in |
| OD | 5 in |
| Width | 0.25 in |
| Condition | New |
|---|---|
| Base Number | L15QA408 |
| Industry Terms | thin section bearing, thin ring bearing, Reali-Slim, Silverthin, slim section bearing, large bore thin bearing, Type A angular contact, open thin section |
| Bore Shaft Size | 4.500 in |
| Mpn Variants | L15QA408YP, L15QA408-YP, L15QA408, L15 QA 408 YP, L15QA-408-YP |
| Manufacturer Status | FAG legacy thin section reference; no online Schaeffler datasheet. Equivalent Kaydon and Silverthin numbers are current. |
| Compatible With Replaces | Direct replacement for Kaydon KA045AR0 and Silverthin SA045AR0. NOT interchangeable with the CP0 (radial contact), XP0 (four-point), BR0 (duplex back-to-back), FR0 (duplex face-to-face) or the sealed JSA045CP0 / JSA045XP0 variants at the same bore - different internal designs. |
| Arrangement Configuration | Single row Type A, thrust in one direction. Reversing thrust is served by a duplex pair, BR0 back-to-back or FR0 face-to-face, or by a four-point contact bearing, XP0. |
| Precision Class | ABEC 1 |
| Additional Attributes | Square cross section 1/4 x 1/4 in, confirmed arithmetically: (5.000 - 4.500)/2 = 0.250 in wall per side = the 0.250 in width. This is the calculation that proved the old 1/2 in title width wrong. Land diameters L1 4.686 in, L2 4.814 in, L3 counterbore 4.865 in. Maximum fillet radius cleared 0.025 in - note this is small, respect it at both shoulders. Race width tolerance +0.000 / -0.005 in. Corners normally chamfered. Dynamic thrust load capacity 1,580 lbf; static thrust 4,810 lbf. Radial and thrust ratings are NOT additive. DESIGNATION DECODE: L15 = FAG thin section prefix; Q = cross-section code (Q = 1/4 x 1/4, R = 5/16, S = 3/8, T = 1/2, mapping to Kaydon A/B/C/D); A = Type A single-row angular contact; 408 = bore in whole inches plus sixteenths (4-08/16 = 4.500 in), NOT hundredths - corroborated by SKF using the identical digits in FPAA408; YP = one-piece machined brass circular-pocket separator. Note Kaydon's section letters differ from FAG's, so the correct Kaydon cross is KA045AR0. PROVENANCE: no published Schaeffler or FAG document giving the Q/R/S/T section table was located; the mapping is derived from independently verified dimensional data points plus the Silverthin interchange. Unlike the heavier sections in this family, SEALED variants are catalogued at this bore: JSA045CP0 and JSA045XP0. NOT PUBLISHED: ball count. |
| Item Weight | 0.210 lb |
| Cage Material | Brass |
| Number Of Rows | 1 |
| Contact Angle | Not specified |
| Design Units | Inch |
| Part Number | L15QA408YP |
| Cross Reference 1 | Kaydon KA045AR0 |
|---|---|
| Cross Reference 2 | Silverthin SA045AR0 |
| Cross Reference 3 | SKF FPAA408 |
| Cross Reference 4 | NSK NBA11406 |
| Cross Reference 6 | RBC KA045AR0 |
| Cross Reference 7 | SSB RA045AR0 |
| Cross Reference 8 | INA CSEA045 (Schaeffler in-house sibling, not a third-party substitute) |
A thin section angular contact ball bearing, 4.500 in bore x 5.000 in outside diameter x 0.250 in wide. It is the direct equivalent of Kaydon KA045AR0 and Silverthin SA045AR0 — open, single row, Type A angular contact, with 1/8 in balls in a one-piece machined brass pocket separator, ABEC Class 1.
Thin section bearings are built on a square cross section, so (outside diameter − bore) ÷ 2 equals the width. Here (5.000 − 4.500) ÷ 2 = 0.250 in of wall each side, matching the 1/4 in width. Silverthin’s datasheet for the equivalent SA045AR0 gives 4.500 x 5.000 x 1/4 in.
L15: FAG thin section series prefix.
Q: the cross-section code. Q, R, S and T are ascending sections mapping to Kaydon’s letters: Q = 1/4 x 1/4, R = 5/16 x 5/16, S = 3/8 x 3/8, T = 1/2 x 1/2. Q is the 1/4 in section.
A: Type A, single row angular contact, thrust in one direction.
408: bore in whole inches plus sixteenths, so 4 and 08/16 = 4.500 in. SKF uses the identical digits in its FPAA408 equivalent.
YP: one-piece machined brass circular-pocket separator.
Static radial load capacity: 1,660 lbf.
Dynamic radial load capacity: 637 lbf on the Kaydon method, 1,410 lbf on the ISO 281:1990 basis.
Static thrust load capacity: 4,810 lbf.
Dynamic thrust load capacity: 1,580 lbf.
Land diameters: L1 4.686 in, L2 4.814 in, L3 counterbore 4.865 in.
Ball diameter: 1/8 in.
Maximum fillet radius cleared: 0.025 in.
Race width tolerance: +0.000 / −0.005 in.
Precision: ABEC Class 1.
Weight: 0.210 lb.
Corners: normally chamfered.
Radial and thrust ratings are separate columns, and a combined load is checked against a combined-load calculation.
The ratings are small relative to the bearing’s diameter, at 637 lbf dynamic radial from a five-inch bearing. The section trades load capacity for a thin radial wall and a large open bore. The design driver is usually something passing through the middle, such as a hollow shaft, cable bundle, slip ring, laser path or coolant line. Typical uses are robotics joints, gimbals, rotary and index tables, medical imaging gantries, semiconductor wafer handlers and optical positioners. At 1/8 in ball diameter this is one of the finer sections in the range and a light-duty precision positioning bearing.
Maximum fillet radius cleared: 0.025 in.
Race width tolerance: +0.000 / −0.005 in.
Thin rings are flexible and adopt the form of the housing bore or shaft seat they are clamped into.
Type A carries thrust in one direction. Reversing thrust is served by a duplex pair, BR0 or FR0, or by a four-point contact bearing, XP0.
Direct equivalents: Kaydon KA045AR0, Silverthin SA045AR0, SKF FPAA408, NSK NBA11406, NTN KYA045, RBC KA045AR0, SSB RA045AR0, INA CSEA045, the INA reference being a Schaeffler in-house sibling.
Related designs at the same bore: SA045CP0 / KA045CP0 radial contact, SA045XP0 / KA045XP0 four-point contact, SA045BR0 duplex back-to-back, SA045FR0 duplex face-to-face, JSA045CP0 sealed radial contact, JSA045XP0 sealed four-point. Sealed variants are catalogued at this bore.
$53.53
48 in stock
$43.50
29 in stock
$141.11
255 in stock
A shipping cutoff banner measures a vendor’s dock. It tells
When a motor stops running, the first instinct is to find the part that looks
From Caligula’s luxury fleet to modern factories, this is the story of how a single
When sourcing a replacement bearing, you will often find both Timken and SKF options for
Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
Sort
Brand
Price
MPN
Categories
