Overview

This document provides detailed technical specifications, characteristics, and dimensional data for Stainless Steel Fairloc Hub Spur Gears, specifically modules 0.5, 0.8, and 1.0 made from SUS303 stainless steel. These gears conform to JIS precision grades and are designed for use in mechanical power transmission applications.

Specifications

• Material: SUS303 stainless steel
• Precision Grade: JIS grade N8 (JIS B1702-1: 1998) and JIS grade 4 (JIS B1702: 1976)
• Gear Teeth: Standard full depth
• Pressure Angle: 20°
• Heat Treatment: None
• Tooth Hardness: Less than 187 HB

Product Characteristics and Cautions

• Allowable torque values are calculated based on assumed usage conditions; users should refer to detailed notes (Page 31) for application-specific considerations.
• Backlash values provided are theoretical for a pair of identical gears in mesh, measured in the normal direction.
• Fairloc Hub Gears attach to shafts via friction coupling; recommended shaft tolerances are g6, h6, and h7. Torque slippage must be considered during selection.
• Clamping screws must not be tightened without a shaft inserted to avoid permanent bore deformation.
• Some gears (SUSL0.5 with ≥96 teeth, SUSL0.8 with ≥60 teeth, SUSL1 with ≥48 teeth) are press-fitted into hubs, which may have slight shape variations.
• Secondary machining operations should be performed carefully to avoid distortion of the clamping groove.

Dimensional and Mechanical Data

The document includes extensive tables listing gear catalog numbers, module sizes, number of teeth, bore diameters, hub diameters, pitch diameters, outside diameters, face widths, hub widths, total lengths, and cap screw dimensions. Key mechanical parameters include:

• Allowable Torque: Provided in Newton-meters (N·m) and kilogram-force meters (kgf·m) for bending strength and surface durability.
• Backlash: Typically ranges from 0 to 0.10 mm.
• Weight: Specified per gear, ranging from a few grams to several kilograms depending on size.
• Fastening Torque vs. Slipping Torque: Charts and data illustrate the relationship between clamping screw torque and the slipping torque of the gear on the shaft, highlighting that slipping torque can be less than gear strength and must be considered carefully during design.

Design and Usage Recommendations

• Ensure proper shaft tolerance and friction coupling to prevent slippage.
• Do not overtighten clamping screws without shaft insertion to maintain bore integrity.
• Select gears considering the allowable torque and slipping torque relationship to avoid mechanical failure.
• Refer to provided dimensional data for precise gear selection and integration into assemblies.
• Use DXF files available from the Web Catalog for accurate gear drawings and CAD integration.

Summary

This technical document serves as a comprehensive guide for selecting and applying Stainless Steel Fairloc Hub Spur Gears made from SUS303. It emphasizes precision standards, mechanical limits, and installation cautions to ensure reliable performance in mechanical systems. The detailed tables and charts support engineers in making informed decisions regarding gear size, torque capacity, and mounting requirements.