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Rodless Positioners - R4 Large

R4 Series

The R4 Series is our most powerful rodless actuators system, built for the heaviest loads, high acceleration and maximum duty cycle. The robust design incorporates an internal linear motion guide rail with a built-in flexible seal to ensure reliable operation in industrial environments. Belt-drive models offer the most rapid moves while screw drives offer the highest thrust capacity and repeatability.

Limited availability outside North America


Motors available for use with the R4 Series include:

  • KollmorgenT32T and T41T Series hybrid stepper motors
  • Kollmorgen AKM42E, 42G, 52G, and 52H Series AKM™ brushless servo motors
  • NEMA 34and 42 custom motor mounts


  • Max length: 2,743 mm (108 in)
  • Max thrust: 3,114 N (700 lbf), screw models
  • Max speed: 3,000 mm/s (120 in/s), belt models
  • Ball screw or timing belt drives
  • Stepper, brushless servo and custom motor options
  • Internal bearings: recirculating on a precision ground rail
  • Bearing housing: 6063-T6 aluminum, hard-anodized
  • Carriage assembly: 6063-T6 aluminum, hard-anodized
  • Guide housing: 6063-T6 aluminum, hard-anodized
  • Helical gearing: alloy steel, case-hardened
  • Ball screw: 1.0" diameter hardened alloy steel screw; alloy steel, heat-treated ball nut
  • Belt drive: 1.5" wide L pitch urethane with steel reinforcement cords
  • Flexible seal: stainless steel band, elastomeric seal


  • Standard or custom lengths to 0.1 inches
  • English or metric carriage mount
  • Motor or screw brakes
  • Right/left side lube port
  • Magnetic home and limit sensors
  • Single or dual carriages
  • Belt or helical gear, parallel or inline direct transmission
  • Water resistance protection
  • Right/left breather vent/tubing


Max. Stroke Length, mm (in) 2740 (108)
Profile, mm (in) 91 x 108 (3.6 x 4.25)
Guide Type Profile Rail
Screw Leads (in/rev) 1, 0.25  
Screw Diameter (in/rev) 1  
Bearing 20 mm rail, 2 bearing block
PERFORMANCE SPECIFICATIONS Travel life standard: 25.4 km (1,000,000 in)
Max. Thrust Force, N (lbf) 3100 (700) 1300 (300)
Max. Velocity, mm/s (in/s) 1000 (40) 3000 (120)
Max. Carriage Load:  
Normal, N (lb) 1300 (300)
Roll Moment, N-m (lb-in) 67.8 (600)
Pitch Moment, N-m (lb-in) 113 (1000)
Repeatability, mm (in) +/-0.025 (0.001) +/-0.25 (0.010)
Max Duty Cycle (%) 100 100
Limit Sensors Optional Optional
Std. Operating Temp Range, °C (°F) -28 to +60 (-20 to +140)
Environment IP 44 rated: Splash-proof, protected against ingress solid particles greater than 0.040 <1 mm> diameter.

Media & Downloads

Title File Language Date Share URL
R2A/R3/R4 Series Rodless Actuators Operator's Manual English
Share URL /sites/default/files/public_downloads/Rseries_Users_Manual_en-US_rev1_0.pdf
R4 Ball Screw Specs en-US English
Share URL /sites/default/files/public_downloads/R4_Ball_Screw_Specs_en-US.pdf
R4 Belt Drive Specs en-US English
Share URL /sites/default/files/public_downloads/R4_Belt_Drive_Specs_en-US.pdf
Title Language Date Share URL
Kollmorgen R Series Linear Positioners Selection Guide English Share URLview

These 3D models are intended to guide your design activities and may be used as reference information. Be sure to consult a Kollmorgen expert to ensure you have the most current and accurate information for critical aspects of design work.

Title File Language Date Share URL
R4 Series English
Share URL

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