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HepcoMotion PRT2 bearings are available in five sizes to suit the five ring slide sections. Bearings can be used with more than one ring size.
The following bearing formats and fixing methods cater for most design requirements:
  • Twin Bearing type has the smoothest running quality, is easiest to adjust and offers some compliance to accommodate misalignment. It has two deep groove ball bearings on a single stud, and is the usual choice for many systems.
  • Double Row Bearing type (DR) incorporates a one-piece outer ring with two ball tracks. It offers more load capacity, life and stiffness, and copes better with debris. Dimensions are identical to the twin bearings type. DR bearings are more demanding of installation tolerances and it is recommended that they are specified with the CHK option*4.
  • Nitrile Sealed option (NS) available for both bearing formats, provides better sealing against water or debris than the metal shielded type. A small increase in friction may result
Through Hole Fixing type is available in two stud lengths covering most thicknesses of mounting plate, the short version being used in HepcoMotion carriages. Both are available in Concentric (C) which provides a datum for the system, and Eccentric (DE) to provide enough adjustment to permit disengagement of a carriage or ring encircled by bearings.
All bearings are available in a Controlled Height version (CHK) which minimizes variation in the B1 dimension*4. This is desirable in high precision applications and is recommended whenever Double Row Bearings are used.
Unit of Measure

Specifications

For use with Ring Slides

 N/A R25

For use with Ring Discs

 N/A RD25

For use with Curved Segments

 N/A RES, RIS

For use with Track System

 N/A TNS

Dimension A

 N/A 25 mm

Dimension B

 N/A 16.6 mm

Dimension B1

 N/A 9 in

Dimension C (RSJ)

 N/A 9.8 mm

Dimension C (RLJ)

 N/A 19 mm

Dimension C1 (RSJ)

 N/A 3.8 mm

Dimension C1 (RLJ)

 N/A 13 mm

Dimension C2 (RSJ)

 N/A 2.2 mm

Dimension C2 (RLJ)

 N/A 4.9 mm

Dimension Q

 N/A 3 mm

Dimension R

 N/A 1.5 mm

Dimension S

 N/A 7 in

Dimension S1

 N/A 9 mm

Dimension T

 N/A 12 mm

Dimension T1

 N/A 5 mm

Dimension T2

 N/A 10 mm

Dimension U ( ± 0.1)

 N/A 50 mm

Dimension U1

 N/A 72 mm

Dimension V

 N/A 14 mm

Dimension W

 N/A 32 mm

Dimension X

 N/A M5

Dimension Y

 N/A 8.5 mm

Dimension Z

 N/A 10 mm

Manufacturing Notes

N/A For 1: It is recommended that holes to suit bearing mounting studs should be reamed to tolerance F6 for a sliding fit.
For 2: Nuts and washers are supplied with both concentric and eccentric RSJ/RLJ type bearings.
For Dimension N & R: 'N' is the eccentric offset due to the double eccentric design (2 x N = total stroke). R dimension is both the eccentric offset of the adjusting nut and total stroke at the bearing centerline.
For Dimension B1: Controlled height (CHK) bearings are selected in ±0.010mm bands in respect of the B1 dimension. They are supplied in sets of up to 50 parts as standard, with larger sets on request.
For 5: For adjusting tool part numbers see table. For adjustment procedure and fixing nut tightening torques see 58.
For 6: Fasteners for the through fixing type bearings are black on the concentric version and bright zinc plated on the eccentric version for identification purposes, except stainless steel type.
For 7: Stainless steel bearings are only available nitrile sealed