Plastic Gear Rack Transmission Sprocket Toothed Track 7*4*125mm

Basic Dimensions & Geometry

• Module (m): 0.5 (tooth pitch of 0.5mm)
• Rack Length: 125mm total
• Tooth Height (H): 7mm from root to tip
• Rack Thickness / Face Width (b): 4mm

Mounting Features

• Pre-drilled Holes: Typically includes alternating small (~2.05mm) and larger (~2.55mm) through-holes for easy fastening Hole Pitch & Layout: Evenly spaced to allow mounting on custom frames or supports

Material & Construction

• Material: Commonly moulded from low-noise, low-wear plastics like nylon, acetal (Delrin), or standard thermoplastics
• Weight: Lightweight (a 250mm rack weighs ~6.8g; the 125mm version approx. 3—4g)

Typical Applications

Suited for:

• DIY CNC or robotic linear drives
• Miniature rack-and-pinion systems
• RC models, 3D printers, and educational projects
• Low-load automation and prototyping

Summary Table

Buying Tips & Compatibility

• Choose the 0.5 module if matching with brass or plastic pinions of the same module for smooth meshing.
• Check hole size/spacing to align with your mounting screws or standoffs.
• Ensure rack width (4mm) matches the width of your gear or is slightly less for clearance.