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Planetary Roller Screw

Planetary Roller Screws Featured Image
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws
  • Planetary Roller Screws

Planetary Roller Screws

Planetary roller screws convert rotary motion into linear motion. The drive unit is a roller between the screw and the nut, the main difference with ball screws is that the load transfer unit uses a threaded roller instead of a ball. Planetary roller screws have multiple contact points and can withstand large loads with very high resolution.


Product Detail

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Planetary Roller Screw

Roller Screw VS Ball Screw

Planetary roller screws are able to withstand higher static and dynamic loads due to the high number of contact points, with static loads up to 3 times that of ball screws and a life expectancy up to 15 times that of ball screws.

The large number of contact points and the geometry of the contact points make planetary screws more rigid and shock resistant than ball screws, while also providing higher speeds and greater acceleration.

Planetary roller screws are threaded, with a wider range of pitches, and planetary roller screws can be designed with smaller leads than ball screws.

Roller

Classification and application of roller screws

Standard type planetary roller screws are a high precision, high load design that provides very stable drive torque. Screws are mostly used in high load, high speed and high acceleration applications. Special gears on the rollers and nuts allow the screws to maintain good motion even under the harshest conditions.

Recirculating planetary roller screws are a cyclic roller design in which the rollers are guided in a carrier whose movement is controlled by a set of cams.This design combines very high positioning accuracy resolution and stiffness and at the same time guarantees very high loading forces.This design is suitable for high precision, low to medium speed operation.

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Standard Planetary Roller Screws

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Reverse Planetary Roller Screws

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Recirculating Planetary Roller Screws

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Differential Planetary Roller Screws

Reverse planetary roller screws, where the rollers do not move axially along the screw, but their travelling motion is in the internal threads of the nut. This design achieves a higher minus rating through smaller lead distance, which reduces drive torque. The more compact dimensions make direct guidance possible. Gears are designed between the roller and the screw to provide a smoother and more stable synchronised rotary motion.

Differential planetary roller screws are characterised by their differential motion, which allows them to have a smaller lead than general planetary roller screws. When applied to electromechanical actuators, they can obtain a larger reduction ratio while other conditions remain unchanged, and their compact structure allows electromechanical actuators to have a higher power-to-volume ratio and power-to-mass ratio, which is more suitable for high-speed and heavy-duty applications.

KGG has established sufficient inventory of standard planetary roller screw products to greatly shorten delivery cycles for global customers. The full stock product lineup covers nominal diameters ranging from Ø15mm to Ø72mm, and is available with two mainstream standard nut structures: RSR cylindrical nut and RSS flange nut (without wiper). All stocked standard products adopt single-nut and right-hand thread configuration, and support zero-backlash preload customization to meet high-precision assembly demands.

The standard series offers three core lead specifications of 5mm, 10mm and 20mm, with outstanding comprehensive performance including high load capacity, ultra-high rigidity and maximum transmission efficiency of 89%. It can fully adapt to various precision and heavy-duty linear transmission scenarios.

Core Advantage: In-stock standard screw blanks support customized shaft end machining with a lead time of just one week.

Different from the traditional full-cycle production mode that requires long waiting time, KGG adopts stock blank reservation + rapid customized processing mode. Based on complete spot inventory, we quickly complete personalized shaft end machining according to customers’ actual installation and matching requirements, effectively shortening customer project debugging and launching cycle, and providing efficient and reliable supply solutions for precision linear drive equipment.

Product Core Technical Parameters

Nominal Diameter D

Lead P

Screw Thread Starts N

Helix Angle [°]

Single NutDynamic Load Ca(kN)

Single NutStatic Load Coa(kN)

Rigidity Coefficient Fk [N/μm]

Axial Clearance (mm)

Available Nut Type

Max. Shaft Length (mm)

Forward Efficiency

Reverse Efficiency

15

5

5

6.056

28.9

51.5

39.4

0.00–0.04

RSR/RSS

600

0.89

0.88

15

10

5

11.981

31.4

48.9

29.8

0.00–0.05

RSS

600

0.88

0.86

20

5

5

4.666

48.0

100.2

53.5

0.00–0.03

RSR

1000

0.88

0.87

21

10

5

8.619

63.5

92.2

35.6

0.00–0.05

RSS

1000

0.89

0.87

25

5

5

3.794

81.3

161.5

59.6

0.00–0.03

RSS

1200

0.87

0.85

25

10

5

7.555

89.6

148.1

43.6

0.00–0.05

RSR/RSS

1200

0.89

0.88

30

5

5

3.036

107.2

224.7

75.5

0.00–0.03

RSS

1500

0.86

0.83

30

10

5

6.056

126.3

226.5

52.9

0.00–0.04

RSS

1500

0.89

0.88

48

20

5

7.555

360.1

659.2

55.9

0.00–0.05

RSS

2000

0.89

0.88

56

20

6

6.486

308.6

589.1

61.4

0.00–0.04

RSS

2000

0.89

0.88

60

20

5

6.056

500.4

1057.1

68.4

0.00–0.04

RSS

2000

0.89

0.88

72

20

5

5.053

639.5

1666.1

82.7

0.00–0.04

RSS

2000

0.88

0.87

Supplementary Notes

  1. Nut types: RSR cylindrical nut & RSS flange nut (without wiper)
  2. Zero-backlash configuration available
  3. Stock models: single nut, right-hand thread only
  4. Screw shaft length & shaft end profile can be customized
  5. RSS planetary roller screws with shaft diameter Ø30–Ø72 are available upon inquiry for customized versions

Application Cases

  • Plastic Molding
  • Broaching
  • Electromechanical Presses
  • Factory Automation
  • Oil and Gas Industry
  • Aerospace
  • Railway
  • Steel Industry
  • Space and Telescopes
  • Flight Simulators

RS Type Planetary Roller Screws

Highest efficiency rolling motion (even in shallow lead designs).

Multiple contact points that carry large loads with very high resolution.

Small axial movement (even with very shallow leads).

Series List

RSI&RSD Inverted/Recirculating Planetary Roller Screws

An inverted roller screw works on same principle as a planetary roller screw. In order to reduce the overall actuator dimensions, either the nut or screw can be directly used as a push tube. 

An inverted roller screw has a high speed capability similar to a planetary roller screw, but the load acts directly on the translating push tube.

Series List

Planetary Roller Screws with Standard Nuts in Stock

Specifically designed to replace hydraulic cylinders and ball screw electric cylinders

RSR1505S

RSR1505S
Roller Screw Specifications 

Screw Mid-diameter:      Φ15
Screw Inner Diameter:   Φ14.6
Screw Lead:                       5
Number of Starts:            5
Screw Hand:                     RH
Roller Number:               10
Resulting Lead Angle:   6.056°
Surface Roughness:       Ra0.4
Surface Hardness:         HRC58-62
Screw Material:              GCr15 
Nut Material:                  GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2 
Anti-rust Treatment:     Anti rust oil

RSS1505S

RSS1505S
Roller Screw Specifications

Screw Mid-diameter:      Φ15
Screw Inner Diameter:   Φ14.6
Screw Lead:                       5
Number of Starts:            5
Screw Hand:                     RH
Roller Number:               10
Resulting Lead Angle:   6.056°
Surface Roughness:       Ra0.4
Surface Hardness:         HRC58-62
Screw Material:              GCr15 
Nut Material:                  GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2 
Anti-rust Treatment:     Anti rust oil

RSR2005S

RSR2005S
Roller Screw Specifications

Screw Mid-diameter:     Φ19.5
Screw Inner Diameter:   Φ19
Screw Lead:                       5
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                11
Resulting Lead Angle:    4.666°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSR2510S

RSR2510S
Roller Screw Specifications

Screw Mid-diameter:     Φ24
Screw Inner Diameter:   Φ23.1
Screw Lead:                       10
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                10
Resulting Lead Angle:    7.555°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSS2510S

RSS2510S
Roller Screw Specifications 

Screw Mid-diameter:     Φ24
Screw Inner Diameter:   Φ23.1
Screw Lead:                       10
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                10
Resulting Lead Angle:    7.555°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSR3010S

RSR3010S
Roller Screw Specifications

Screw Mid-diameter:     Φ30
Screw Inner Diameter:   Φ29.2
Screw Lead:                       10
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                10
Resulting Lead Angle:    6.056°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSS3010S

RSS3010S
Roller Screw Specifications

Screw Mid-diameter:     Φ30
Screw Inner Diameter:   Φ29.2
Screw Lead:                       10
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                10
Resulting Lead Angle:    6.056°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSR4820S

RSR4820S
Roller Screw Specifications
Screw Mid-diameter:     Φ48
Screw Inner Diameter:   Φ46.1
Screw Lead:                       20
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                 9
Resulting Lead Angle:    7.555°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSS4820S

RSS4820S
Roller Screw Specifications

Screw Mid-diameter:     Φ48
Screw Inner Diameter:   Φ46.1
Screw Lead:                       20
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                 9
Resulting Lead Angle:    7.555°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSR5620S

RSR5620S
Roller Screw Specifications 

Screw Mid-diameter:     Φ56
Screw Inner Diameter:   Φ56.7
Screw Lead:                       20
Number of Starts:            6
Screw Hand:                     RH
Roller Number:                 11
Resulting Lead Angle:    6.486°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSS5620S

RSS5620S
Roller Screw Specifications

Screw Mid-diameter:     Φ56
Screw Inner Diameter:   Φ56.7
Screw Lead:                       20
Number of Starts:            6
Screw Hand:                     RH
Roller Number:                 11
Resulting Lead Angle:    6.486°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSR6020S

RSR6020S
Roller Screw Specifications 

Screw Mid-diameter:     Φ60
Screw Inner Diameter:   Φ58.3
Screw Lead:                       20
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                 10
Resulting Lead Angle:    6.057°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

RSS6020S

RSS6020S
Roller Screw Specifications

Screw Mid-diameter:     Φ60
Screw Inner Diameter:   Φ58.3
Screw Lead:                       20
Number of Starts:            5
Screw Hand:                     RH
Roller Number:                 10
Resulting Lead Angle:    6.057°
Surface Roughness:        Ra0.4
Surface Hardness:          HRC58-62
Screw Material:               GCr15
Nut Material:                   GCr15
Roller Materialg:            GCr15/SUJ2
Lubricating System:      GHY NO.2
Anti-rust Treatment:     Anti rust oil

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