Designations of CF and CFH series inch cam followers

Single Row Full Complement Needle Rollers
The needle roller diameter, length, and number have been optimized to provide a high dynamic and static load rating, contained within industry standard bearing envelope dimensions.

Heavy Section Outer
The heavy section outer helps support radial loading and provide proper rolling element support.

Cylindrical or Crowned Outside Diameter (OD)
The cylindrical OD can improve performance in certain applications such as improved track capacity by maximizing the contact area with the track.A crown on the OD of a cam follower bearing can increase bearing life versus a standard cylindrical cam follower. The crown achieves this performance by helping to distribute the stress on the outer ring and rolling elements resulting from misalignment due to mounting inaccuracy or stud deflection. The crown also helps reduce outer skidding in turntable or rotary applications. Not all applications may see the benefit of a crowned OD, consult Application Engineering for guidance for your application.

Zone Hardened Raceways
Heat treatment used to precisely harden working surfaces of the raceway and flange. The hardened surfaces provide support for the rolling element contact stresses, while keeping the core of the inner ductile to help absorb shock loads.

Hardened Endplate
Similar to the flange, the endplate must provide a seal surface for the seal and resist wear from incidental contact with the outer or rollers. The hardened and ground endplate provides a sealing surface with seal option.

Factory Grease Fill
The cam follower and cam yoke roller bearings are factory lubricated with a medium temperature grease. Contact Application Engineering when application conditions require special lubricants.

Lubrication Holes
Depending on mounting option, C&H stud type bearings may include a lubrication hole to accept a standard drive fitting or an included oil hole plug. The oil hole plug is recommended for closing unused holes to help protect against bearing contamination or lubrication loss.

Oil Hole Plugs
All  C&H stud type Cam followers include 1-2 (depending on # of holes) oil hole plugs to help provide proper lubrication path to the rolling elements and prevent contamination from entering the bearing through an unused oil hole.

Black Oxide Finish
Bearings have a black oxide finish on all external surfaces.

Seal
The standard for seals, the seal helps keep contaminants out and lubrication in the bearing, with an integral back plate to separate the metal to metal contact between the outer ring and endplate(s) or flange. The back plate feature reduces friction resulting in lower operating temperatures which can extend grease life and allowing for higher operating speeds. The seal also includes vents to help prevent seal blowout during relubrication, while the outer raceway is machined with a reservoir for additional lubricant capacity. The seal option has a good balance of sealing, lubricant capacity, and low drag operation essential to a precision cam follower suited for most industrial applications.

Screw Driver Slot or Hex Hole (Broached)
The hex hole can aid in the installation and removal of stud-type cam followers by increasing the holding power over a standard screw driver slot. The hex feature is identified with a “B” since it is produced using a broach process. Bearing relubrication from flange end must be considered for sizes under 3”.

Eccentric Stud
Eccentric stud option provides a means of adjusting the radial position of the bearing which can improve the load sharing of inline bearing combinations. Cam follower load sharing helps reduce operation costs by reducing premature failures due to overloaded bearings, the need of precise mounting hole location tolerances and providing ability to realign bearing due to track wear. Eccentric bushing is press fit on stud and unhardened to permit dowel or setscrew for permanent locking.

Bushing Type
Non-Metallic bushing provides load support with a sliding motion that reduces the need for bearing lubrication for non-food applications where relubrication is not convenient or grease contamination in the process is not acceptable. Max allowable continuous operating temperature up to 200°F (80°C). Bushing bearings are intended to be used in the self lubricated mode. However, continuous feed oil lubrication can be used to provide reduced wear rates. Grease lubrication should not be used.

Corrosion Resistance
C&H inch cam followers are available in 400 series corrosion resistant components for improved resistance to both external and internal corrosion. CRES bearings are dimensionally interchangeable with standard bearings and easily identifiable with “CR” designation. 

The permissible operating temperature for cam followers can be limited by:

• the stud, the outer ring and rollers
• the cage
• the seals
• the lubricant
• the other components

When temperatures outside the permissible range, please contact us.

Stud, outer ring and rollers

Cam followers are heat stabilized up to at least:

• 140 °C (280 °F) for designs based on a cylindrical roller bearing
• 120 °C (250 °F) for designs based on a needle roller bearing

Cages

The permissible operating temperature for cages depends on the seal material:

• steel cages can be used at the same operating temperature as the stud, the outer ring and rollers
• 120 °C (248 °F) for polyamide 66 cages

Seals

The permissible operating temperature for seals depends on the seal material:

• NBR: –40 to +100 °C (–40 to +210 °F)
  Temperatures up to 120 °C (250 °F) can be tolerated for brief periods
• PP: –20 to +80 °C (–5 to +185 °F)
  PTFE: -196 to +260 °C (–320 to +500°F)  * continuous working temperature had better below +200 °C ( +392°F)
• Sheet metal angle rings can be used at the same operating temperatures as the stud, the outer rings and rollers

Lubricants

Lithium Soap Grease NLGI #2 

• SINOPEC Hangu 2# :  –20 to +120 °C (–4 to +248 °F)
• Shell Alvania EP2: –20 to +120 °C (–4 to +248 °F)

Other components

Eccentric collars and pressed-on flange rings can be used at the same operating temperature as the stud, the outer ring and rollers.

Bearing tolerances and clearances

• Tolerances: Normal, Other, Cam followers
• Radial Internal clearance: Cam followers

Fit:

• Fit
• Dimensional tolerances of mounting hole