Overview: This document outlines the specifications and guidelines for selecting and using KHK stock screw gears, detailing materials, modules, configurations, and providing application hints and cautions for assembly and secondary operations.

Specifications: Screw gears are available in four materials: S45C (steel), SUS303 (stainless steel), CAC702 (aluminum-bronze), and MC901 (plastic). They come in modules from 1 to 4, with teeth numbers ranging from 10 to 30. Designed for offset shafts, they accommodate skewed and parallel shafts based on helix hands.

Material Characteristics:

• S45C: Known for strength, suitable for general applications.
• SUS303: Rust-resistant, ideal for food machinery.
• CAC702: Offers excellent wear resistance.
• MC901: Lightweight, usable without lubrication.

Selection and Usage:

• Specify correct helix hand (R or L) when ordering.
• Consider material combinations to prevent abrasion.
• Adhere to guidelines for allowable torque and backlash values.
• Select proper bearings to manage axial thrust forces.

Application Hints:

• Use the Niemann formula for calculating allowable surface strength.
• Ensure proper backlash by following specified center distances and tolerances.
• For parallel shaft applications, consult KHK Helical Gears guidelines.

Cautions:

• Avoid mating gears of the same material to prevent wear.
• Follow secondary operation guidelines to maintain gear integrity.
• Consider thrust force directions based on helix hand and rotation.

Tables and Data: The document includes tables listing catalog numbers, modules, number of teeth, helix direction, and dimensions for each gear type, along with allowable torque values, backlash ranges, and weight for each configuration.