Description
EP-KR90 / EP-KRV90 is the EVER POWER designation for the 90 mm nominal outside-diameter size in the KR/KRV stud type track roller family. It uses a M30x1.5 stud, an outer-ring width of 35 mm and a speed reference of 5,000 rpm. This size is a practical screening point for large machine-tool/ATC mechanisms and heavy-duty track-following equipment.
Technical parameters
| Parameter | Value |
|---|---|
| Outside diameter D* | 90 mm |
| Outer-ring width C | 35 mm |
| D1 | 30 mm |
| Stud thread | M30x1.5 |
| Eccentric reference e | 0.5 mm |
| Basic load rating C* | 2,830 |
| Basic load rating C0* | 3,700 |
| Speed reference | 5,000 rpm |
| Mass | 1950 g |
| IKO reference | CF30-2 |
| WERB KR legacy | NAKD90 |
| WERB KRV legacy | NAKD90V |
Dimensions and mounting interface
EP-KR90 is the largest listed outside diameter in the current range. Confirm the full 90 mm track envelope, 35 mm outer-ring width and available machine clearance before selecting it for a replacement or new design.
| Dimension | Value |
|---|---|
| G1 | 32 mm |
| B max | 37 mm |
| B1 max | 100 mm |
| B2 | 63 mm |
| B3 | 15 mm |
| C1 | 1 mm |
| rs min | 1 mm |
For the largest listed size, direct stud mounting depends on a rigid support and adequate access. Confirm the full M30 shoulder stack, tightening clearance and the 90 mm ring position against the machine layout before fitting the follower.
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.
Use the largest listed follower only with a defined radial track reaction and adequate structural support. Any recurring axial or edge load should be addressed in the machine guidance and track geometry before installation.
With the largest ring in the range, machine envelope and handling space become practical constraints. Plan installation and removal access at the same time as the dimensional fit check.
Size-specific selection perspective
Where EP-KR90 / EP-KRV90 fits
EP-KR90 / EP-KRV90 is the largest outside-diameter option listed in this KR/KRV range. Its M30×1.5 stud and wide outer ring place the emphasis on available machine envelope, track width and support stiffness. Large tool-changing or heavy track-following mechanisms may have enough space for the nominal diameter but still lack adequate tightening access or shoulder support, so the axial dimensions must be checked as carefully as D*. For replacement work, photograph the installation before removal and measure the old follower after cleaning the contact surfaces. For a new design, review deflection, lubrication access and the shape of the cam path with the bearing dimensions so the outer ring is supported across the intended contact zone.
Use the 90 mm outer ring, wide C dimension and M30 axial stack as the geometry gate. Only after those fit checks should the heavy mechanism be reviewed for track stiffness, deflection, lubrication access and the real speed/cycle pattern.
Replacement and cross-reference identification
IKO CF30-2 and WERB NAKD90 are useful identifiers for this nominal size. The KRV-family legacy row uses NAKD90V. 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-KR90 | CF30-2 | NAKD90 | Standard KR-family reference; confirm ordered outer-surface and lubrication details. |
| EP-KRV90 | CF30-2 | NAKD90V | KRV-family reference; confirm sealing/guide configuration for the order. |
| EP-KRE90 / EP-KRVE90 | — | — | Eccentric-family naming when an eccentric arrangement is required; confirm e and the complete interface. |
Selection and installation checks
Confirm D* 90 mm, C 35 mm, M30x1.5 thread, B/B1/B2 geometry and the available shoulder/corner clearance.
Inspect the mating track in the context of machine-tool or heavy cam motion. A displaced contact band, ridge or local impact mark can indicate an alignment or track problem that should be corrected before EP-KR90 / EP-KRV90 is installed.
The speed reference is 5,000 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-KR90 / EP-KRV90 against the real machine interface
For the largest listed size, provide the old marking, quantity, 90 mm diameter and C-width check, full M30 axial stack, track width, support details and machine cycle. A drawing or photo should show the available service space around the follower.
