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R2A Series

The R2A Series offers a carriage bearing design that produces lower bearing friction, smoother operation and zero running clearance. A flexible seal prevents environmental contamination and ensures long life to provide an effective, industrial-grade solution. Belt-drive models offer the most rapid moves, while screw-drive designs offer the highest thrust capacity and repeatability.

Limited availability outside North America
Rodless Positioners - R2A Large


Motors available for use with the R2A Series include:

  • Kollmorgen T22T and T31T Series hybrid stepper motors (P7000 drive recommended)
  • Kollmorgen R2A-AKM23C, and 23D Series AKM™ brushless servo motors
  • NEMA 23, 34 and custom motor mounts


  • Lead screw, ball screw or timing belt drives
  • Max length: 1,829 mm (72 in)
  • Max thrust: 450 N (100 lbf), screw models
  • Max speed: 2,000 mm/s (80 in/s), belt models
  • Stepper, brushless servo and custom motor options
  • Internal guide bearings:4 angular contact bearings with a ground Gothic arch raceway running on dual precision rails
  • Bearing housing: Type 380 die-cast aluminum, epoxy coated
  • Carriage assembly: 6063-T6 aluminum, hard-anodized
  • Guide housing: 6063-T6 aluminum, hard-anodized, Teflon-impregnated
  • Acme screw: 0.625" diameter alloy steel screw, bronze nut
  • Ball screw: 0.625" diameter hardened alloy steel screw; alloy steel, heat-treated ball nut
  • Belt drive: 0.5" wide polyurethane with steel reinforcement cords
  • Helical gearing: alloy steel, case-hardened


  • Standard or custom lengths to 0.1 inches
  • English or metric carriage mount
  • Motor or screw brakes
  • Magnetic home and limit sensors
  • Single or dual carriages
  • Belt or helical gear, parallel or inline direct transmission
  • Water resistance protection


MECHANICAL SPECIFICATIONS Ball Screw Drive Lead Screw Drive Belt Drive
Max. Stroke Length, mm (in) 1830 (72)
Profile, mm (in) 51 x 51 (2 x 2)
Guide Type Roller Guides
Screw Leads (in/rev) 0.5, 0.2 0.2, 0.125  
Screw Diameter (in/rev) 0.625 0.625  
Bearing 4-Gothic arch raceway on dual precision rails
PERFORMANCE SPECIFICATIONS Travel life standard: 25.4 km (1,000,000 in)
Max. Thrust Force, N (lbf) 450 (100) 320 (72)
Max. Velocity, mm/s (in/s) 760 (30) 2000 (80)
Max. Carriage Load:  
Normal, N (lb) 22 (5)
Roll Moment, N-m (lb-in) 5.6 (50)
Pitch Moment, N-m (lb-in) 11.3 (100)
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.

Get Started

Count on Kollmorgen support to help you design and build a successful machine and keep it reliably productive, anywhere in the world. Our co-engineering experts will work with you to tailor a perfect-fit solution for your motion requirements.

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Title Language(s) Date Size
pdfR-Series-Perform-Curves en-US revA English 1021.18 KB Copy URL
pdfR2A/R3/R4 Series Rodless Actuators Operator's Manual English 01 Jul 1999 1.35 MB Copy URL
Title Language(s) Date Size
Kollmorgen R Series Linear Positioners Selection Guide English 01 Jan 2018 6.72 MB Copy URL

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 Language(s) Date Size
R2A Series English Copy URL