LDO
LDO NEMA 17 MOTOR LDO-42STH48-2504AC (DFH)
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High-torque 48mm LDO NEMA 17 stepper for CoreXY motion systems. LDO's official LDO-42STH48-2504AC spec identifies this as a 2-phase, 1.8° stepper rated at 2.5A/phase with 0.55 N·m holding torque and a 48mm body.
Why use this motor
- More torque than a short NEMA 17: the 48mm body and 0.55 N·m holding torque make it a good fit for higher-load printer motion axes.
- Standard printer ecosystem fit: 5mm shaft, 4-lead wiring, and NEMA 17 mounting make it easy to pair with common pulleys and stepper drivers.
- LDO part-number grounded: manufacturer model LDO-42STH48-2504AC; this part is also commonly sold as 42STH47-2504AC.
Specifications
- Manufacturer / MPN: LDO LDO-42STH48-2504AC
- Motor type: 2-phase NEMA 17 stepper motor
- Step angle: 1.8° ± 5%
- Rated voltage: 3.0V/phase
- Rated current: 2.5A/phase
- Phase resistance: 1.2Ω ± 20%
- Phase inductance: 1.5mH ± 20%
- Holding torque: 0.55 N·m / 5.5 kgf·cm
- Body length: 48mm
- Approximate weight: 0.35kg
- Leads: 4
- Insulation class: Class B, 130°C
Fitment and pairings
- Useful for Mercury One.1 / Zero G-style CoreXY motion work; pair it with the Zero G Mercury One.1 Motion Kit if you are building that conversion.
- For a typical 5mm-shaft belt drive, match it with a 20T 5mm-bore pulley and compatible GT2 belt.
- Drive it with a properly configured stepper driver such as the BTT TMC2209 v1.2 Stepper Driver; set current from your controller and printer configuration, not from the product page alone.
Gotchas
- This is the AC model, not the high-temperature AH variant.
- Confirm shaft length, connector, and cable routing against your printed parts before ordering for a non-Mercury/non-Voron build.
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.
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