LDO
LDO NEMA 17 MOTOR LDO-42STH48-2504AH
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High-temp LDO NEMA 17 stepper for fast 3D printer motion. The LDO-42STH48-2504AH is a 48 mm-body, 1.8° two-phase stepper rated at 2.5A/phase with 55 N·cm holding torque and a 24 mm × 5 mm output shaft.
Why this motor
- Class H 180°C insulation for enclosed-printer and higher-current use where ordinary steppers run out of thermal headroom.
- 48 mm body / 55 N·cm torque gives a useful balance of speed, holding force, and compact NEMA 17 fit.
- 1.8° step angle and 200 steps/rev match common CoreXY and Voron motion setups.
- Ships as the high-temperature AH variant; for the non-high-temp AC sibling, see the LDO-42STH48-2504AC.
Specifications
- Manufacturer part number: LDO-42STH48-2504AH
- Frame size: NEMA 17
- Step angle: 1.8° ± 5%
- Rated current: 2.5A/phase
- Rated voltage: 3.0V/phase
- Phase resistance: 1.2Ω ± 20%
- Phase inductance: 1.5mH ± 20%
- Holding torque: 5.5 kgf·cm / 55 N·cm
- Body length: 48 mm
- Output shaft: 24 mm long, 5 mm diameter
- Insulation class: Class H, 180°C
- Connector lead: removable 4-wire motor harness
Use it for
- High-speed 3D printer motion systems, including Voron-style CoreXY builds and upgrades.
- Applications where a high-temperature NEMA 17 is preferred over a standard insulation-class motor.
- Builds using common 5 mm-bore motion hardware such as a 20T 5 mm-bore pulley and plug-in driver wiring.
Gotchas
- This is the 24 mm shaft AH version, not the long-shaft S55/S80 dual-shear variant.
- High-temp insulation improves thermal tolerance, but motor life still depends on current, cooling, and chamber temperature; tune current to the machine instead of blindly running the full rating.
- Use a real stepper driver and wiring harness; if you need drivers or connector service parts, see the BTT TMC2209 driver and JST-XH kit.
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.
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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:
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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.
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