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Rodless Positioners - R3 Large

R3 Series

R3 Series rodless actuators provide a robust design with an internal linear motion guide rail and built-in flexible seal to ensure reliable operation in industrial environments. Equipped for high loads or high acceleration with maximum duty cycle, the R3 Series is available with either belt drive for the most rapid moves or screw drive for the highest thrust capacity and repeatability.

Limited availability outside North America


Motors available for use with the R3 Series include:

  • Kollmorgen T22T and T31T Series hybrid stepper motors
  • Kollmorgen R3-AKM23C, 23D, 42E, and 42G Series AKM™ brushless servo motors
  • NEMA 23, 34 and custom motor mounts


  • Max length: 2,743 mm (108 in)
  • Max thrust: 1,335 N (300 lbf), screw models
  • Max speed: 3,000 mm/s (120 in/s), belt models
  • Lead screw, 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
  • Acme screw: 0.625" diameter alloy steel screw, lubricated bronze nut
  • Ball screw: 0.625" diameter hardened alloy steel screw; alloy steel, heat-treated ball nut
  • Helical gearing: alloy steel, case-hardened
  • Belt drive: 1.0" wide XL pitch polyurethane 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 or left side lube port
  • Single or dual carriages
  • Belt or helical gear, parallel or inline direct transmission
  • Water resistance protection
  • Magnetic home and limit sensors


MECHANICAL SPECIFICATIONS Ball Screw Drive Lead Screw Drive Belt Drive
Max. Stroke Length, mm (in) 2740 (108)
Profile, mm (in) 64 x 71 (2.5 x 2.8)
Guide Type Profile Rail
Screw Leads (in/rev) 0.5, 0.2 0.2, 0.125  
Screw Diameter (in/rev) 0.625 0.625  
Bearing 15 mm rail, 2 bearing blocks
PERFORMANCE SPECIFICATIONS Travel life standard: 25.4 km (1,000,000 in)
Max. Thrust Force, N (lbf) 1300 (300) 900 (200)
Max. Velocity, mm/s (in/s) 760 (30) 3000 (120)
Max. Carriage Load:  
Normal, N (lb) 440 (100)
Roll Moment, N-m (lb-in) 33.9 (300)
Pitch Moment, N-m (lb-in) 56.5 (500)
Repeatability, mm (in) +/-0.025 (0.001) +/-0.25 (0.010)
Max Duty Cycle (%) 100 60 100
Limit Sensors Optional Optional Optional
Std. Operating Temp Range, °C (°F) -28 to +60 (-20 to +140)
Environment IP 44 rated: Splash-proof, protected against ingress of 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
R3 Ball Screw Specs en-US English
Share URL /sites/default/files/public_downloads/R3_Ball_Screw_Specs_en-US.pdf
R3 Belt Drive Specs en-US English
Share URL /sites/default/files/public_downloads/R3_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
R3 Series English
Share URL

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