IKO CFE20-1BUU Eccentric Cam Follower, M20 thread, 47 mm OD, Sealed, Cylindrical

This page covers 15 IKO CFE Series eccentric cam followers (CFE6BUU to CFE30-2BUU, M6 to M30 thread): a hexagon hole in the stud head, needle rollers in a cage, sealed type construction and a cylindrical outer ring. Choose the size in the options above; each variant has its own dimensions and ratings in the Model Details.

The CFE series is the eccentric type: an eccentric collar on the stud lets you turn the stud to set the outer ring position and spread the load evenly across the outer ring surface, with an eccentricity of 0.4 to 1.5 mm across the range. A cam follower is a bearing with a stud, with needle rollers inside a thick-walled outer ring. The outer ring rotates and runs directly on the mating track (cam guide surface), so cam followers suit cam mechanisms and linear motions and are used in machine tools, industrial robots, electronic devices and office automation (OA) equipment.

In the part number, the number is the stud size (thread diameter G) in mm; B is the hexagon hole in the stud head, V is the full complement type (no V is with cage), UU is the sealed type (no UU is the shield type), and R is the crowned outer ring (no R is cylindrical). Every model on this page is sealed type, with cage, cylindrical outer ring.

Where this product is used

• Cam mechanisms, with the outer ring running directly on the cam track
• Linear motion and follower applications
• Machine tools and industrial robots
• Electronic devices and office automation (OA) equipment

Features

• Eccentric type with an eccentric collar and a hexagon hole in the stud head: turn the stud with a hex key to set the outer ring position, then fix it with the nut and spring washer; eccentricity 0.4 to 1.5 mm
• Needle rollers in a cage: a small coefficient of friction and suited to high speed rotations
• Sealed type: seals fitted in the narrow clearances keep foreign substances out
• Cylindrical outer ring: a large contact area on the mating guide surface, suited to large loads or a low hardness guide surface
• Prepacked with grease
• Supplied with a nut and, on the larger studs, a grease nipple (see the Model Details for each size)
• Basic dynamic load rating C 3,660 to 45,400 N and static load rating C0 3,650 to 85,100 N (each size in the Model Details)
• Track capacity 3,400 to 59,300 N on a 40 HRC mating surface

Key specifications

Available sizes

Length B1 is the overall length with the stud; where marked max it is a maximum. C is the basic dynamic load rating and C0 the basic static load rating. Mass is for the product body only: the nut, grease nipple and other accessories are not included.

Selecting the right option

Pick the outside diameter of the outer ring (dimension D, in mm) in the options above: the stud size, thread and ratings follow from the model number shown in the Model Details. All sizes on this page are stud types with a hexagon hole in the stud head and a cage.

Some stud sizes come with more than one outer ring, so check the diameter against your cam track: 22 mm OD and 26 mm OD (CFE10BUU and CFE10-1BUU); 30 mm OD and 32 mm OD (CFE12BUU and CFE12-1BUU); 47 mm OD and 52 mm OD (CFE20-1BUU and CFE20BUU); and others in the size table.

The thread diameter G is the size that goes into your mounting hole. The eccentric collar (outside diameter de in the Model Details) sits in the hole, so the hole must also take the collar, and its length must be at least dimension S (B2 - G1 + 0.5 mm), which is worked out for each model in the Model Details.

This page is the cylindrical outer ring type. A cylindrical ring has a large contact area with the mating guide surface and suits applications where the applied load is large or the guide surface hardness is low.

Every model here has a cage, which gives a small coefficient of friction and suits high speed rotations.

Fitting and use

Make the centre axis of the mounting hole perpendicular to the direction of travel and match the stud shoulder accurately with the seating surface given by dimension f (min.) in the Model Details. Keep the chamfer on the mounting hole as small as possible (C0.5 or so), and do not hit the flange head directly with a hammer, because that can lead to irregular rotation or cracking.

The eccentric type is mounted with the mark on the stud head as the reference position. Turn the stud with a screwdriver or hex key in the hexagon hole to adjust the outer ring position, then fix it with a nut and spring washer; do not exceed the maximum tightening torque. Where shock loads are applied and the adjusted eccentricity has to be kept, a dowel pin through the housing, stud and eccentric collar is recommended (not practical for studs under 8 mm).

The mark on the flange head shows the oil hole position on the raceway: keep the oil hole out of the loading zone. The recommended mounting hole tolerance for the stud is H7.

Lubrication: the models on this page are prepacked with grease.

Track capacity is the load that can be applied continuously on a steel cam guide surface of 40 HRC without deforming or indenting it.

Related products

Other IKO CFE series pages (other outer ring, rolling element, seal or material types): CFE series eccentric cam followers, with cage, sealed, crowned, M6 to M30 thread, CFE20VBUU eccentric cam follower and CFE series eccentric cam followers, full complement, sealed, crowned, M18 to M30 thread. Related stud types: CF series cam followers, with cage, sealed, cylindrical, 3 to 30 mm stud and NUCF series cylindrical roller cam followers, full complement, shield type, crowned, 10 to 30 mm stud.