- Catalogs
- NSK Europe Ltd.
- ROLLED BALL SCREWS & SUPPORT UNITS
ROLLED BALL SCREWS & SUPPORT UNITS
ROLLED BALL SCREWS & SUPPORT UNITS
NSK's R Series rolled ball screws are categorized by nut model, offering a variety of configurations for different applications. The series is standardized for quick delivery and features interchangeable screw shafts and ball nuts, sold separately. It includes 128 types of nut assembly combinations with multiple screw shaft lengths.
- Standardization allows for short delivery times.
- Interchangeable components with specified maximum axial play.
- Cost-effective due to rolled processing.
- Extensive series with numerous combinations.
- Lead accuracy is Ct10 grade.
- Axial play varies with internal specifications.
- Run out of screw shaft center is Ct10 grade.
Detailed procedures for inserting the ball nut into the rolled screw shaft and machining the shaft end are provided. Rust prevention is applied at delivery, with additional treatments available upon request.
Reference numbers are provided for ordering and inquiries. Combinations of shaft diameter and lead are detailed in tables, indicating nut model codes and relevant page numbers.
Support units are classified and detailed with reference numbers, components, and load capacities. Installation instructions for ball nuts and screws are provided, along with lubrication guidelines.
Detailed specifications and dimensions for rolled ball screw shaft ends and support units are provided. Key dimensions include screw shaft diameter, bearing journal, retaining ring groove, and hexagonal hole measurements.
Support units are categorized based on application and shape, such as fixed support with angular contact ball bearings and simple support with deep groove ball bearings. Features include short delivery times, suitable bearings, high dust prevention, and low friction torque.
The product coding system for support units is explained, detailing nominal size codes, mounting codes, and bearing combination codes. Examples are provided for both light and heavy load applications.
Details on the components of support units, including bearing housing, spacer, locknut, and snap ring, are provided. Disassembling fixed support side units is advised against due to precise preloading and adjustment.
The installation section covers the centering of units, installation of ball nuts, and support bearings. It emphasizes alignment for optimal performance and provides a flowchart for installation procedures.
For heavy load applications, thrust angular contact ball bearings with high rigidity and accuracy are described. Specifications include preload, axial rigidity, and starting torque.
- Installation of Bearings: Use a special sleeve to avoid direct impact on bearings. Tighten the lock nut with specified torque while checking the run-out of the screw shaft end.
- Lubrication: Replenish lubrication grease as shown in the procedure. If grease is not used, NSK applies antirust oil to ball screws during shipping.
- Motion Smoothness Check: Use a torque wrench to measure the starting torque of the ball screw for the full stroke of the table.
- Trial Operation: Operate the machine slowly, then at medium and high speeds, checking for noise and vibration.
- Two types of lubrication methods are available: grease and oil. Choose the method that best suits the operational conditions and purpose.
- Grease lubrication is preferred for its simplicity, not requiring special oil supply systems.
- NSK offers precision ball screws, rolled precision ball screws, linear guides, linear bushings, monocarriers, and megatorque motors.
- A table is provided for converting units such as force, torque, and length between different measurement systems.
- NSK provides contact details for its offices worldwide, including locations in Africa, Asia, Europe, and the Americas.
Catalog excerpts
MOTION & CONTROL NSK ROLLED BALL SCREWS
Open the catalog to page 1
Table of Contents Rolled Ball Screw R Series - Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2 Rolled Ball Screws - Reference Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3 Rolled Ball Screws RNFTL - Flanged Nut (fine, medium lead) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pages 4 to 7 Rolled Ball Screws RNFTL - Flanged Nut (high helix lead) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Open the catalog to page 3
Rolled Ball Screw R Series (1) Product classification NSK rolled ball screws are classified by nut model as shown in Table 1. Table 1 Classification of rolled ball screws Nut model Recirculation system Nut shape RNFTL Flanged, Tube projecting type Lead classification Page Return tube type Fine, medium lead 6 High helix lead 8 RNFBL Flanged Circular Return tube type Fine, medium lead 10 RNCT V-thread (no flange) Projecting tube type Return tube type Fine lead 12 RNSTL Square type Return tube type Small, medium leads 14 End cap type High helix lead 16 RNFCL Flanged Circular Ultra high helix lead...
Open the catalog to page 4
Rolled Ball Screws Reference number of rolled ball screw is described below. Please use reference number to order, or for a price inquiry. Product code (rolled nut) Screw shaft diameter (mm) Screw shaft (example) Product code (Rolled screw shaft) Screw shaft diameter (mm) Seal code S: With seal No code: Without seal Effective turns of balls (turns of _balls x number of circuit) Internal design code Screw shaft length (x 100 mm) Internal design code (8) Combinations of shaft diameter/lead Combinations are shown below in Table 2. The table also indicates nut model codes and page numbers to refer...
Open the catalog to page 5
R Series: Rolled Ball Screws Tube type: Flanged nut (fine, medium lead) Ball nut dimensions Outside dia. D RNFTL 1003A3.5 RNFTL 1006A2.5S RNFTL 1208A2.5S RNFTL 1404A3.5S RNFTL 1405A2.5S RNFTL 1610A2.5 RNFTL 1610A2.5S RNFTL 1808A3.5 RNFTL 1808A3.5S RNFTL 2005A2.5 RNFTL 2005A2.5S RNFTL 2010A2.5 RNFTL 2010A2.5S RNFTL 2505A5 RNFTL 2505A5S RNFTL 2510A2.5 RNFTL 2510A2.5S RNFTL 2510A5 RNFTL 2510A5S Lead Ball diameter Ball circle diameter Root diameter Effective turns of balls d Ball nut no. Shaft diameter l Dw dm dr Turns x circuits Dynamic Ca Static C oa 10 10 12 14 14 3 6 8 4 5 2.381 2.381 2.778 2.778...
Open the catalog to page 6
R Series: Rolled Ball Screws Tube type: Flanged nut (fine, medium lead) RNFTL 2806A2.5 RNFTL 2806A2.5S RNFTL 2806A5 RNFTL 2806A5S RNFTL 3210A5 RNFTL 3210A5S RNFTL 3610A2.5 RNFTL 3610A2.5S RNFTL 3610A5 RNFTL 3610A5S RNFTL 4010A7 RNFTL 4010A7S RNFTL 4512A5 RNFTL 4512A5S RNFTL 5010A7 RNFTL 5010A7S RNFTL 5016A5 RNFTL 5016A5S Lead Ball diameter Ball circle diameter Root diameter Effective turns of balls d Ball nut no. Shaft diameter l Dw dm dr Turns x circuits Dynamic Ca Static C oa 2.5 x 1 7430 20300 28 6 3.175 28.5 25.0 Basic load rating (N) 6.35 33.75 27.0 36 10 6.35 37 13500 2.5 x 2 35700 92200...
Open the catalog to page 8
R Series: Rolled Ball Screws Tube type: Flanged nut (high helix lead) Ball nut dimensions Outside dia. D RNFTL 1212A3 RNFTL 1616A3 RNFTL 1616A3S RNFTL 2020A3 RNFTL 2020A3S RNFTL 2525A3 RNFTL 2525A3S RNFTL 3232A3 RNFTL 3232A3S RNFTL 4040A3 RNFTL 4040A3S Lead Ball diameter Ball circle diameter Root diameter Effective turns of balls d Ball nut no. Shaft diameter l Dw dm dr Turns x circuits Dynamic Ca Static C oa 12 12 2.381 12.65 10.1 1.5 x 2 3360 6270 0.10 24 16 16 2.778 16.65 13.6 1.5 x 2 4880 9650 0.10 30 20 20 3.175 20.75 17.3 1.5 x 2 7010 15400 0.10 35 25 25 3.969 26 22.0 1.5 x 2 10500 24100...
Open the catalog to page 10
R Series: Rolled Ball Screws Return tube type, nut with V-thread (fine lead) Ball nut dimensions Outside dia. D RNCT 1003A3.5 RNCT 1404A3.5S RNCT 1405A2.5S RNCT 1808A3.5 RNCT 1808A3.5S RNCT 2005A2.5 RNCT 2005A2.5S RNCT 2505A5 RNCT 2505A5S RNCT 2510A5 RNCT 2510A5S RNCT 2806A5 RNCT 2806A5S RNCT 3210A5 RNCT 3210A5S RNCT 3610A5 RNCT 3610A5S RNCT 4010A7 RNCT 4010A7S RNCT 4512A5 RNCT 4512A5S RNCT 5010A7 RNCT 5010A7S RNCT 5016A5 RNCT 5016A5S Lead Ball diameter Ball circle diameter Root diameter Effective turns of balls d Ball nut no. Shaft diameter l Dw dm dr Turns x circuits Dynamic Ca Static C oa...
Open the catalog to page 14
R Series: Rolled Ball Screws End cap type, flanged nut (high helix lead) Ball nut dimensions Outside dia. D RNFCL 1212A3 RNFCL 1212A6 RNFCL 1520A3 RNFCL 1520A3S RNFCL 1616A3 RNFCL 1616A3S RNFCL 1616A6 RNFCL 1616A6S RNFCL 2020A3 RNFCL 2020A3S RNFCL 2020A6 RNFCL 2020A6S RNFCL 2525A3 RNFCL 2525A3S RNFCL 2525A6 RNFCL 2525A6S RNFCL 3232A3 RNFCL 3232A3S RNFCL 3232A6 RNFCL 3232A6S RNFCL 4040A3 RNFCL 4040A3S RNFCL 4040A6 RNFCL 4040A6S RNFCL 5050A3 RNFCL 5050A3S RNFCL 5050A6 RNFCL 5050A6S Shaft diameter Lead Ball diameter Ball circle diameter Root diameter Effective turns of balls d Ball nut no. l Dw...
Open the catalog to page 18
R Series: Rolled Ball Screws End cap type, flanged nut (ultra high helix lead) RNFCL 1632A2 RNFCL 1632A2S RNFCL 1632A3 RNFCL 1632A3S RNFCL 1632A6 RNFCL 1632A6S RNFCL 2040A2 RNFCL 2040A2S RNFCL 2040A3 RNFCL 2040A3S RNFCL 2040A6 RNFCL 2040A6S RNFCL 2550A2 RNFCL 2550A2S RNFCL 2550A3 RNFCL 2550A3S RNFCL 2550A6 RNFCL 2550A6S RNFCL 3264A3 RNFCL 3264A3S RNFCL 3264A6 RNFCL 3264A6S RNFCL 4080A3 RNFCL 4080A3S RNFCL 4080A6 RNFCL 4080A6S Shaft diameter Lead Ball diameter Ball circle diameter Root diameter Effective turns of balls d Ball nut no. l Dw dm dr Turns x circuits Dynamic Ca Static C oa 0.7 x 4 4600...
Open the catalog to page 20
Ball Screw Support Units - Classification Table 5 Support unit categories Application Bearing bore Bearing seat diameter Page Angular contact ball bearing ø6~ø25 26 Simple support side Deep groove ball bearing ø6~ø25 28 Support side Bearing in use WBK**-01 Fixed support side WBK**S-01 Small equipment, light load Shape Square Small equipment, light load Angular contact ball bearing 30 WBK**-11 Fixed support side ø6~ø25 Round Machine tools, heavy load Thrust angular contact ball bearing 32 WBK**DF*-31 Fixed support side ø17~ø40 Round Features • Short delivery time: Standardized items in stock....
Open the catalog to page 24All NSK Europe Ltd. catalogs and technical brochures
Ball Screws - BSS Series1 Page
BNEQARTET Bearings1 Page
TF Series Bearings1 Page
HMS series1 Page
Archived catalogs
ROBOT MODULE™ MR SERIES44 Pages
Precision Machine Components55 Pages
Disc Harrow Bearings2 Pages
ROLLING BEARINGS707 Pages
TECHNICAL INSIGHT2 Pages
Hub unit bearings23 Pages
CONDITION MONITORING6 Pages
BEARING MOUNTING TOOLS28 Pages
Automotive Products48 Pages
NSK IN EUROPE6 Pages
Linear Guides Standard Items62 Pages
Bearings for the Steel Industry44 Pages
Corporate Brochure24 Pages
Molded Oil™- Bearings9 Pages
Bearing Replacement Guide264 Pages
Bearing Doctor44 Pages
Self-Lube Hand book160 Pages
ROLLING BEARINGS283 Pages
Bearings for the Cement Industry20 Pages
Added Value Training12 Pages
Authorised Distributor7 Pages
Bearings for Quarry and Mining20 Pages
Handling Instructions48 Pages
Double Row Ball Bearing44 Pages
Pocket Guide Linear Motion44 Pages
Deep Groove Ball Bearings12 Pages
Plummer Blocks52 Pages
Guide to RHP Self-Lube12 Pages
Corporate Precision Components24 Pages
Agri Disc Hub1 Page
Troubleshooting poster1 Page
Super Precision Bearings120 Pages
Ball Screw Support Bearings44 Pages
Asset improvement programme6 Pages
Bearings for Pumps & Compressors24 Pages
