Description
EP-KR40 / EP-KRV40 is the EVER POWER designation for the 40 mm nominal outside-diameter size in the KR/KRV stud type track roller family. It uses a M18x1.5 stud, an outer-ring width of 20 mm and a speed reference of 8,500 rpm. This size is a practical screening point for packaging, printing, machine-tool auxiliaries and robust automation.
Technical parameters
| Parameter | Value |
|---|---|
| Outside diameter D* | 40 mm |
| Outer-ring width C | 20 mm |
| D1 | 18 mm |
| Stud thread | M18x1.5 |
| Eccentric reference e | 0.35 mm |
| Basic load rating C* | 1,180 |
| Basic load rating C0* | 1,220 |
| Speed reference | 8,500 rpm |
| Mass | 247 g |
| IKO reference | CF18 |
| WERB KR legacy | NAKD40 |
| WERB KRV legacy | NAKD40V |
Dimensions and mounting interface
EP-KR40 sits immediately below the 47/52 mm M20 group. It can be a useful selection point when the mechanism needs a larger follower than EP-KR35 but cannot accept the M20 stud envelope.
| Dimension | Value |
|---|---|
| G1 | 19 mm |
| B max | 21.6 mm |
| B1 max | 58.2 mm |
| B2 | 36.5 mm |
| B3 | 8 mm |
| C1 | 0.8 mm |
| rs min | 1 mm |
For the M18 interface, check both the threaded engagement and the clearance around the mounting tool. The follower should seat against the intended shoulder while leaving the outer ring aligned with the working track.
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.
The working contact should remain radial and centered across the running surface. In printing or packaging mechanisms, side marking often points to track or frame alignment that should be corrected separately.
On printing or packaging machinery, note whether residue builds on the track and whether cleaning changes the lubricant condition. Those observations belong in the replacement discussion for this M18 size.
Size-specific selection perspective
Where EP-KR40 / EP-KRV40 fits
EP-KR40 / EP-KRV40 is the M18-thread step between the medium M16 size and the larger M20 group. It is relevant to robust packaging, printing and machine-tool auxiliary mechanisms where both rolling contact and mounting stiffness need attention. Before a retrofit, confirm the available axial space around the stud and the clearance required for tightening. Printing and packaging machines may also expose the follower to dust, ink, cleaning chemicals or rapid cyclic motion, so the lubricant and sealing requirement should be stated rather than assumed. Track condition matters as much as the new follower: a ridge, narrow wear band or local impact mark can shorten the life of a correctly dimensioned replacement.
Use the M18 stud and 40 mm ring to confirm physical fit first. Printing, packaging or machine-tool auxiliary duty can then be screened by cycle, contamination, track finish and support stiffness without assuming one application condition applies to all machines.
Replacement and cross-reference identification
IKO CF18 and WERB NAKD40 are useful identifiers for this nominal size. The KRV-family legacy row uses NAKD40V. 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-KR40 | CF18 | NAKD40 | Standard KR-family reference; confirm ordered outer-surface and lubrication details. |
| EP-KRV40 | CF18 | NAKD40V | KRV-family reference; confirm sealing/guide configuration for the order. |
| EP-KRE40 / EP-KRVE40 | — | — | Eccentric-family naming when an eccentric arrangement is required; confirm e and the complete interface. |
Selection and installation checks
Confirm D* 40 mm, C 20 mm, M18x1.5 thread, B/B1/B2 geometry and the available shoulder/corner clearance.
Inspect the mating track in the context of high-cycle cam motion. A displaced contact band, ridge or local impact mark can indicate an alignment or track problem that should be corrected before EP-KR40 / EP-KRV40 is installed.
The speed reference is 8,500 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-KR40 / EP-KRV40 against the real machine interface
Send the old marking, quantity, M18 interface, available axial/radial clearance, machine function and cycle. Printing or packaging enquiries should also note dust, ink/cleaning exposure and the desired lubricant or sealing arrangement.
