Overview

This document provides detailed technical specifications, model coding, dimensional data, and performance parameters for various types of ball screws manufactured by STAF. The focus is on compact design, low noise, and high precision ball screws suitable for diverse industrial applications.

1. Ball Screw Types and Models

The document lists multiple ball screw types including FSC, FSU, RSY, FDU, RSH, FSB, FSE, FDI, RSK, FSK, FSI, FSS, and RSU. Each type is characterized by specific dimensions, load capacities, speed ratings, and mounting options.

Key Parameters per Model:

• Speed (rpm): Ranges from hundreds to several thousands depending on model.
• Buckling Load: Critical axial load capacity varies by diameter and lead.
• Critical Speed: Maximum rotational speed before instability.
• Dimensions: Detailed shaft diameters, thread sizes, mounting distances, and flange types are provided in millimeters.

2. End Support Types and Mounting Distances

End support configurations include Fixed-Fixed, Fixed-Free, Fixed-Supported, and Supported-Supported. Mounting distances are specified in millimeters and vary by model and support type, affecting the critical speed and buckling load.

3. Model Number Coding System

The document explains the coding system for ball screw and nut model numbers, which includes:

• Nominal Diameter (Size)
• Lead (distance the nut moves per screw revolution)
• Circulation Type: Internal, Large lead, Low noise, EU standard, Cylindric, Miniature
• Thread Direction: Right hand (R) or Left hand (L)
• Number of Nut Circuits: Single or double
• Surface Treatments: Trivalent chromium, Fluoride chrome coating, Black oxide, or none
• Mounting Type: Flanged, Non-flanged, Special flange
• Axial Clearance & Preload Codes: Backlash or various preload levels
• Accuracy Grades: C5 (0.018 mm), C7 (0.05 mm), C10 (0.21 mm)

4. Dimensional Data and Notes

Extensive tables provide dimensions such as shaft diameter, thread pitch, nut width, flange size, and thread length. Notes clarify that some models can be produced with left-hand helix and that the shaft thread is typically 3.5 mm.

5. Performance and Application Recommendations

The data includes critical speed and buckling load values essential for selecting the appropriate ball screw for high-speed or high-load applications. The document emphasizes the importance of choosing the correct end support type and mounting distance to optimize performance and durability.

6. Additional Information

Contact details for STAF Taiwan and certification information (ISO9001 by SGS) are provided. The document also references compliance with DIN69051 standards for certain circulation types.

Summary of Critical Information

• Ball screws are available in multiple types with varying diameters (6 mm to 63 mm) and leads (0.8 mm to 20 mm).
• Mounting and end support types significantly influence mechanical performance.
• Model coding is comprehensive, allowing precise specification of screw and nut features.
• Surface treatments and preload options enable customization for specific environmental and operational conditions.
• Accuracy grades ensure suitability for precision applications.

This document serves as a comprehensive technical reference for engineers and purchasers selecting ball screws for precision mechanical systems.