Description
Product Description
KR19 stud type track roller
EP-KR19 stud type cam follower bearing with 19 mm outside diameter, M8 x 1.25 metric stud thread and CF8 cross-reference designation.
EP-KR19 keeps an 11 mm roller width but increases the running diameter to 19 mm and the stud interface to M8 x 1.25. That combination makes it a distinct compact-series step rather than simply a wider version of KR16.
The listed B1 maximum length is 32.2 mm and the row mass is 28 g. These dimensions are useful when the machine pocket gives enough radial room for 19 mm but has a tightly controlled axial envelope around the mounting face.
EP-KR19 is listed with D = 19 mm, C = 11 mm, stud diameter 8 mm and M8 x 1.25 thread. The legacy WERB references shown for this row are NAKD19 and NAKD19V.
Key Specifications
EP-KR19 uses the M8 x 1.25 stud interface shown above. Its C and C0 entries remain in the rating table without an added load unit because that unit is not printed in the project size table.
Full Dimension Table
Use the drawing for EP-KR19 to locate D, C, the stud diameter, thread and axial lengths before measuring the removed part. Those interfaces are the primary replacement checks; the cross-reference code should agree with the dimensions rather than override them.
The running-surface note for EP-KR19 allows cylindrical or spherical execution depending on design. Confirm which surface profile the machine requires before choosing between the KR and KRV routes.
| Model | D* (mm) | C (mm) | d1 stud (mm) | Thread | G1 (mm) | B max (mm) | B1 max (mm) | B2 (mm) | B3 (mm) | C1 (mm) | rs min (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| EP-KR19 | 19 | 11 | 8 | M8 x 1.25 | 10 | 12.2 | 32.2 | 20 | — | 0.6 | 0.3 |
Rating and Cross-Reference Data
| Model | Eccentric e (mm)* | Dynamic C** | Static C0** | Limit speed (rpm) | Mass (g) | WERB old | WERB V old | IKO reference |
|---|---|---|---|---|---|---|---|---|
| EP-KR19 | 0.25 | 300 | 210 | 20000 | 28 | NAKD19 | NAKD19V | CF8 |
Eccentric value e = 0.25 mm belongs to the related KRE/KRVE execution for EP-KR19. The C/C0 columns are reproduced without a unit because none is printed in the table; confirm the unit convention before calculation.
Selection and Replacement Notes
Use EP-KR19 and CF8 to locate the candidate row, then verify the dimensions that matter on this machine. For this size, thread M8 x 1.25, roller diameter and roller width should agree with the removed follower or drawing before running-surface and lubrication details are reviewed.
Inspect the contact band while EP-KR19 is still in the mechanism if access allows. A centred, even band supports the size check; edge polishing or grooving is a reason to examine the rail, bracket and stud alignment instead of assuming a new follower alone will resolve the wear.
M8 Interface Before the KR22 Step
For KR19, check the 8 mm stud diameter before comparing cross-reference codes. The M8 x 1.25 thread, 19 mm outside diameter and 11 mm C width create a three-point identification that can be measured with ordinary workshop tools. CF8 then becomes a useful search reference rather than the sole reason for selecting the part.
The jump to KR22 changes several interfaces at once: D rises to 22 mm, C becomes 12 mm and the stud thread becomes M10 x 1.25. That means a machine built around KR19 cannot be evaluated from thread pitch alone, because the pitch value 1.25 continues even though the nominal thread diameter and roller geometry change.
The row lists 20,000 rpm as its limit-speed value and e = 0.25 mm for the eccentric counterpart. For a high-cycle indexing mechanism, record actual cycle speed and dwell behavior in the enquiry. That information is more meaningful than simply asking whether the listed limit-speed value can be reached in service.
During inspection, look at the outer-ring contact band. A band concentrated near one edge may indicate that the track or mounting face deserves attention before a new follower is installed. On an M8 stud, also check that the supporting structure has not elongated or fretted around the mounting hole.
Applications for EP-KR19
Industrial robots & compact automation
Small cam paths, transfer mechanisms and fixture motion where a compact stud-mounted follower fits the available envelope.
Semiconductor & electronics equipment
Wafer, inspection and precision handling mechanisms where compact geometry and controlled lubrication access matter.
Machine-tool auxiliary mechanisms
Compact indexing, guide and tool-handling functions where the follower interface must match a defined machine drawing.
Packaging and labelling machinery
Light cam-driven feed, timing and indexing stations with frequent cycles.
Inspection and indexing equipment
Repeatable cam or track motion in gauges, test fixtures and small indexing assemblies.
Linear track and transfer modules
Stud-mounted rolling contact along a rail where track alignment and contact width can be inspected.
The EP-KR19 application set emphasizes compact equipment that has moved beyond the M5/M6 stud sizes. Confirm the M8 x 1.25 interface, the 19 mm track envelope and the actual contact-band position before treating a robot, machine-tool or packaging application as a size match.
Related Products and Nearby Sizes
EP-KR19 is a useful transition point between the compact KR16 geometry and the M10-based KR22 row. Compare all three cards when the removed part has an 11–12 mm roller width or an incomplete marking.
EP-KR16 Cam Follower Bearing | CF6 Cross Reference | Needle Roller
EP-KR16 stud type cam follower bearing with 16 mm outside diameter, M6 x 1 metric stud thread and CF6 cross-reference designation.
View specificationsEP-KR19 Stud Type Cam Follower | CF8 Cross Reference
EP-KR19 stud type cam follower bearing with 19 mm outside diameter, M8 x 1.25 metric stud thread and CF8 cross-reference designation.
View specificationsEP-KR22 Cam Follower Bearing | CF10 Metric Stud Type
EP-KR22 stud type cam follower bearing with 22 mm outside diameter, M10 x 1.25 metric stud thread and CF10 cross-reference designation.
View specificationsFAQ
What IKO reference is shown for EP-KR19?
The cross-reference table shows CF8 on the same size row as EP-KR19. Use that designation as a cross-reference search aid and verify D, C, stud thread, running-surface profile and any suffix-specific execution before replacement.
What thread does EP-KR19 use?
The listed stud thread for EP-KR19 is M8 x 1.25.
What is the related KRV or eccentric designation?
The paired KRV designation is EP-KRV19. If the machine is designed for eccentric adjustment, the naming convention for the corresponding eccentric executions is EP-KRE19 / EP-KRVE19; the table lists e = 0.25 mm for the size row.
What information should I send for a quote?
For EP-KR19 selection, send the CF8 or other marking, 19 mm D measurement, 11 mm C width, M8 x 1.25 thread, quantity, mounting-hole condition and photographs of both the stud side and running surface.
Get a Quote for EP-KR19
Send EP-KR19 enquiries with the M8 x 1.25 thread and 19 mm roller diameter confirmed. If edge wear is visible on the running surface, include a track photo as well so the replacement review can separate bearing identification from alignment concerns.
