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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
Rodless Positioners - R4 Large


Motors available for use with the R4 Series include:

  • KollmorgenT32T and T41T Series hybrid stepper motors (P7000 drive recommended)
  • 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.
Title Language(s) Date Size Email
pdfR4 Ball Screw Specs en-US revA English 171.84 KB
pdfR4 Belt Drive Specs en-US revA English 171.77 KB
Title Language(s) Date Size Email
Kollmorgen R Series Linear Positioners Selection Guide English 01 Jan 2018 6.72 MB
Title Language(s) Date Size Email
R4 Series English