KHK
KHK DG0.5-40R1, Module 0.5, 40 Tooth, Single Start, Right Hand, Acetal Worm Wheels
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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.
Shipping & Returns
Returns:
Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.
Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.
Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.
Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.
To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.
Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.
Order alterations and cancellations:
Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.
Shipping:
US Shipping is via UPS or USPS. The way it is set up shows the least expensive options for standard, priority and express shipping. I can not take special requests for specific carriers at this time.
International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs.
I require a telephone and email with international orders and you must make yourself available to the carrier or your customs, should they require more information. If you are unreachable and the package is discarded or rerturned, I will not be responsible for rerturning your shipping cost.
If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement.
Addresses are verified through Shopify, but the customer is still responsible for inputting their address in the correct format. Any returns or lost shipments, due to incorrectly addressed packages, are the responsibility of the customer.
