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

Description

Basic Dimensions & Geometry

• Module (m): 0.5 (tooth pitch of 0.5 mm)

• Rack Length: 125 mm total

• Tooth Height (H): 7 mm from root to tip

• Rack Thickness / Face Width (b): 4 mm

🔩 Mounting Features

• Pre-drilled Holes: Typically includes alternating small (~2.05 mm) and larger (~2.55 mm) 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 250 mm rack weighs ~6.8 g; the 125 mm version approx. 3–4 g)

🧰 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 (4 mm) matches the width of your gear or is slightly less for clearance.