Description
EP-KR19 / EP-KRV19 is the EVER POWER designation for the 19 mm nominal outside-diameter size in the KR/KRV stud type track roller family. It uses a M8x1.25 stud, an outer-ring width of 11 mm and a speed reference of 20,000 rpm. This size is a practical screening point for test-socket actuators, compact transfer mechanisms and smaller food/automation equipment.
Technical parameters
| Parameter | Value |
|---|---|
| Outside diameter D* | 19 mm |
| Outer-ring width C | 11 mm |
| D1 | 8 mm |
| Stud thread | M8x1.25 |
| Eccentric reference e | 0.25 mm |
| Basic load rating C* | 300 |
| Basic load rating C0* | 210 |
| Speed reference | 20,000 rpm |
| Mass | 28 g |
| IKO reference | CF8 |
| WERB KR legacy | NAKD19 |
| WERB KRV legacy | NAKD19V |
Dimensions and mounting interface
The 19 mm size is a useful bridge between miniature followers and the M10-thread group. Check that the 11 mm outer-ring width and M8×1.25 stud match the existing mechanism.
| Dimension | Value |
|---|---|
| G1 | 10 mm |
| B max | 12.2 mm |
| B1 max | 32.2 mm |
| B2 | 20 mm |
| B3 | — |
| C1 | 0.6 mm |
| rs min | 0.3 mm |
With the M8 stud, the mounting check should include the threaded depth and the transition at the shoulder. In a retrofit, verify that the outer ring reaches the intended track position after the stud is fully seated.
Construction and configuration choices
The family can use a cylindrical or spherical outer surface depending on design. Confirm the mating-track geometry and edge-contact requirement.
When eccentric adjustment is required, use the KRE / KRVE naming as the enquiry reference and confirm the eccentric value and mounting orientation.
If the mechanism needs a particular KRV sealing arrangement, grease specification, clean-production lubricant or washdown resistance, state it as an ordered requirement.
Keep the working force directed through the intended radial track contact. If the actuator geometry introduces side load, review guide alignment and support geometry before selecting the follower.
This size can be identified efficiently by combining the M8 stud with the 19 mm running diameter and the measured outer-ring width. That three-point check reduces ambiguity when the old marking is damaged.
Size-specific selection perspective
Where EP-KR19 / EP-KRV19 fits
EP-KR19 / EP-KRV19 sits between miniature followers and the larger M10-thread group. That makes it useful for compact actuators and transfer mechanisms where the designer wants more track diameter without the mounting envelope of the next family. The M8 stud and 11 mm outer-ring width should be checked against the real bracket or moving member, including the corner radius at the shoulder. In test-socket or compact automation service, inspect whether the follower sees reversing motion, edge contact or an offset load path. For maintenance replacement, a worn track can create the same symptoms as a worn follower, so condition of the mating surface belongs in the inspection before ordering a new part.
First match the M8 interface and the 19 mm track diameter, then verify the available axial space and the way the actuator reverses direction. That gives a clearer selection basis for small transfer or test mechanisms than a catalogue reference on its own.
Replacement and cross-reference identification
IKO CF8 and WERB NAKD19 are useful identifiers for this nominal size. The KRV-family legacy row uses NAKD19V. Use these references to narrow the search, then verify the physical interface and ordered configuration before treating the parts as interchangeable.
| EP reference | IKO reference | WERB legacy | Replacement note |
|---|---|---|---|
| EP-KR19 | CF8 | NAKD19 | Standard KR-family reference; confirm ordered outer-surface and lubrication details. |
| EP-KRV19 | CF8 | NAKD19V | KRV-family reference; confirm sealing/guide configuration for the order. |
| EP-KRE19 / EP-KRVE19 | — | — | Eccentric-family naming when an eccentric arrangement is required; confirm e and the complete interface. |
Selection and installation checks
Confirm D* 19 mm, C 11 mm, M8x1.25 thread, B/B1/B2 geometry and the available shoulder/corner clearance.
Inspect the mating track in the context of compact precision motion. A displaced contact band, ridge or local impact mark can indicate an alignment or track problem that should be corrected before EP-KR19 / EP-KRV19 is installed.
The speed reference is 20,000 rpm. Real operating suitability still depends on load, lubrication, temperature, contamination and cycle pattern.
State KR/KRV/KRE/KRVE preference, outer-surface geometry, lubricant/sealing requirement and any inspection/documentation needs in the RFQ.
Related sizes
Quote EP-KR19 / EP-KRV19 against the real machine interface
Send the old CF/NAKD or EP marking if available, plus quantity, M8 interface dimensions, track width, motion pattern and an installation photo. If the mechanism reverses frequently or runs in contamination, include that duty information.
