Full Complement Needle Rollers

No cage — needles fill the full bearing circumference, maximising the number of load-carrying rollers and delivering the highest possible radial load capacity for a given envelope size.

Cylindrical vs Crowned Outer Race

KR: cylindrical for accurate parallel tracks. KRV: crowned convex surface accommodates angular misalignment up to ±0.5° and eliminates edge loading on misaligned tracks.

Sealed Both Ends

NBR contact seals on both stud ends retain factory NLGI-2 grease and exclude dust and splash contamination. Re-lubrication via hex socket or grease nipple on the stud.

Eccentric Stud Option (KRE/KRVE)

The stud centreline is offset from the outer race centreline by eccentricity e. Rotating the stud shifts the outer race position by ±e for precise preload adjustment without relocating the mounting hole.

GCr15 Chrome Steel

Outer race and stud manufactured from GCr15 (AISI 52100), through-hardened to HRC 58–64. Needle rollers are precision-ground to ISO tolerance class.

Hexagonal Torque Socket

Hex socket at the stud end for tightening the stud into the mounting thread and for applying the locking wrench when adjusting the eccentric position on KRE/KRVE variants.

WERB / IKO Cross-Reference

Direct dimensional equivalents to WERB NAKD series and IKO CF series cam followers. Stud threads and flats are interchangeable with these standards.

16 Sizes

KR13 to KR90 covering the full range of industrial cam follower applications from light-duty instrument mechanisms to heavy press and transfer line drives.

GCr15 Chrome Steel Outer Race

AISI 52100 equivalent. HRC 58–64 throughout. Thick wall for rigidity under concentrated cam loads. Cylindrical (KR) or crowned (KRV) outer surface ground to Ra 0.2 µm.

Hardened Stud

Same GCr15 material, HRC 58–64. Stud thread manufactured to 6g tolerance for reliable engagement. Hex socket for tightening and eccentric adjustment on KRE/KRVE.

NBR Contact Seals

Contact seals on both stud ends rated −20°C to +110°C. Compatible with lithium-complex and polyurea greases. FKM seals available for high-temperature duty above +110°C.

Cam & Indexing Mechanisms

KR/KRV followers run directly on hardened cam plates in rotary indexing tables, Geneva mechanisms, and barrel cam drives in assembly automation, eliminating separate housing design.

Transfer Line Guides

Used as track rollers on linear cam channels in automotive transfer line pallet systems, where the stud mounting simplifies the carriage structure and allows rapid roller replacement.

Packaging Machinery

Folding, sealing, and cartoning mechanisms use cam followers extensively for intermittent motion profiles. KRV crowned variants accommodate the slight track misalignment that develops as packaging machine frames flex under cyclic loads.

Textile Machinery

Rapier and gripper drive cams in weaving looms operate at high cycle rates — KR/KRV bearings provide the speed capability and shock resistance required in these high-frequency applications.

Printing Presses

Impression cylinder control cams and form roller cams in offset and flexographic presses use stud-type cam followers because the stud mounts directly to the cylinder frame without a housing.

Agricultural Equipment

Baler knotter mechanisms, combine header drives, and seeder metering drives use KR/KRV followers for their dirt tolerance, self-contained stud mounting, and field-replaceable design.

🔎 Mounting Thread & Torque

Thread the stud into the mounting hole using the hex socket. Apply thread-locking compound (Loctite 243 or equivalent) if vibration is present. Tighten to the torque specified for the stud thread size — do not overtighten, which can distort the outer race.

🔧 Cam Track Specification

Cam track must be hardened to HRC 58 minimum, surface roughness Ra 0.4 µm or better. Recommended track material is GCr15 (100Cr6) or case-hardened 20CrMnTi. Soft tracks indent rapidly under needle contact loads.

🔁 KRV Alignment Tolerance

KRV crowned outer surface accommodates angular misalignment up to ±0.5° between the stud axis and the cam track running surface. For misalignment exceeding ±0.5°, use a spherical-seat washer under the stud flange or re-align the mounting structure.

⚙ Eccentric Adjustment (KRE/KRVE)

Loosen the locking nut. Rotate the stud body using a spanner on the flats — rotating 180° shifts the follower position by 2e. Apply light preload against the track (just enough to eliminate detectable play). Tighten the locking nut without rotating the stud.

📈 Lubrication

Factory fill is NLGI-2 lithium-complex grease. Re-lubricate via the hex socket or grease nipple at intervals of 500 km of cam travel or 500 hours. Apply grease until slight resistance is felt — overfilling pressurises the seals and accelerates seal wear.

🔒 Seal Inspection

At each re-lubrication, inspect the NBR seals for cracking, extrusion, or contamination ingress. Replace bearings with damaged seals immediately — contaminated grease rapidly accelerates needle roller and outer race wear.

①

KR vs KRV

Select KR for accurate parallel cam tracks. Select KRV (crowned outer surface) when track parallelism cannot be guaranteed within ±0.5° or when the cam follower must accommodate track deflection under load.

②

Standard vs Eccentric (E)

Select KRE/KRVE when in-situ preload adjustment is required — the eccentric stud shifts the outer race position by ±e without relocating the mounting hole. Essential for zero-backlash cam mechanisms.

③

Calculate Load & Life

Calculate equivalent radial load P from the cam force and geometry. Verify L = (C/P)³ × 10⁶ rev meets the target maintenance interval. If insufficient, select the next larger OD for higher C.

④

Contact Us

MOQ 100 units. Contact our team with cam geometry, load case, speed, and target service life. Eccentric (KRE/KRVE) and special configurations on request.

📞 Ready to Order?

MOQ is 100 units per model. Please provide cam geometry, radial load, operating speed, required service life, and mounting thread specification. Eccentric (KRE/KRVE), high-temperature, and stainless steel configurations available on request. All catalogue data is for reference only.