KHK DG0.5-40R1, Module 0.5, 40 Tooth, Single Start, Right Hand, Acetal Worm Wheels
$14.00
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KHK DG0.5-40R1 is a small-module polyacetal worm wheel for compact worm-drive mechanisms. It is a module 0.5, 40-tooth, right-hand wheel with a 5 mm plain bore, commonly used where a quiet, lightweight reduction stage matters.
Why this wheel
- 40:1 reduction with a single-start worm: KHK lists this wheel for a 40 reduction ratio when paired with the matching single-start worm.
- Polyacetal construction: lighter and quieter than metal worm wheels for low-load motion and extrusion mechanisms.
- Compact geometry: 21 mm outside diameter, 5 mm face width, and 12 mm total length for tight assemblies.
Specifications
- Manufacturer: KHK / KHK USA
- MPN: DG0.5-40R1
- Type: worm wheel, plain bore, shape HA
- Module: 0.5
- Teeth: 40
- Hand: right hand
- Material: polyacetal / acetal resin
- Bore: 5 mm
- Pitch diameter: 20.02 mm
- Outer diameter: 21 mm
- Face width: 5 mm
- Total length: 12 mm
- Pressure angle: 20°
- Lead / helix angle: 2°36'
- Backlash: 0–0.16 mm
- KHK precision grade: W 002 grade 5
Fitment and pairing
- Used in compact worm-drive extruder projects including the Double Folded Ascender Extruder Kit.
- For DFA-style gearing, pair it with the matching KHK SW0.5-R2 steel worm when your build calls for the double-lead 20:1 configuration.
Gotchas
- This is the worm wheel only, not a full gear pair or extruder kit.
- It has a plain 5 mm bore; verify your shaft retention method before ordering.
- Do not substitute a different module or hand unless the mating worm and printed parts are designed for it.
