NEMA 17 Stepper Motor L-Bracket Mounting Plate (Alloy Steel Bracket for 3D Printers & CNC Machines)

Securely mount your 42mm stepper motors with the NEMA 17 Stepper Motor L-Bracket Mounting Plate. Manufactured from high-strength $3 ext{mm}$ thick alloy steel with a black anti-rust finish, this heavy-duty mounting bracket provides rigid structural support to eliminate motor flex and vibration in 3D printers, CNC routers, and robotics platforms. Featuring precision-punched slot holes matching standard NEMA 17 motor dimensions ( $31 ext{mm}$ pitch), it allows smooth belt tension adjustments and effortless installation.

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Tags NEMA 17 Mounting Bracket NEMA 17 L Bracket Stepper Motor Mounting Plate 42mm Stepper Motor Bracket 3D Printer Motor Mount NEMA 17 Steel Holder CNC Stepper Motor Mount

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Product Details :

The NEMA 17 Stepper Motor L-Bracket is a high-rigidity structural mounting solution designed specifically for 42mm frame size (NEMA 17) stepper motors. Engine-cut from $3 ext{mm}$ cold-rolled alloy steel and treated with a protective black powder coating, this bracket resists bending, twisting, and mechanical fatigue even under heavy drive belt tensions or rapid acceleration forces.

Designed with universal slotted mounting holes, the L-bracket allows flexible axial alignment and easy GT2 belt tensioning on 3D printer X, Y, and Z axes. The precision-stamped $22.5 ext{mm}$ center cutout ensures the motor's front bearing hub seats flush against the bracket plate, maintaining true linear shaft alignment for lead screws and drive pulleys.

Key Features and Benefits

$3 ext{mm}$ Alloy Steel Construction: Built to withstand high torque loads without flexing or distortion.
Corrosion-Resistant Powder Coat: Durable black anodized coating guards against rust, wear, and scratch damage.
Integrated Belt Tensioning Slots: Elongated mounting slots make micro-adjusting belt tension straightforward.
Flush Motor Pilot Seating: $22.5 ext{mm}$ center recess accommodates the motor's front alignment boss for true shaft alignment.
Universal 3D Printer & CNC Fit: Compatible with standard NEMA 17 motors from NEMA 17 34mm, 40mm, 48mm, up to 60mm body lengths.

Technical Specifications

Feature Component	Specification Details
Bracket Type	L-Shaped Stepper Motor Mounting Plate
Supported Motor Frame	NEMA 17 ( $42 ext{mm} imes 42 ext{mm}$ Faceplate)
Material	High-Strength Alloy Steel
Surface Finish	Matte Black Powder Coating
Material Thickness	$3.0 ext{ mm}$
Motor Mounting Hole Distance	$31.0 ext{ mm}$ center-to-center
Base Mounting Hole Slots	M4 Slotted Screws / T-Nuts compatible

Installation & Wiring Guide

1. Screw Layout Diagram:

          [  Slot  ]      [  Slot  ]  <-- Base Mounts to 2020 Aluminum Extrusion
         ----------------------------
        |                            |
        |      (o)   22.5mm   (o)    |
        |             C / L          |  <-- NEMA 17 Faceplate Mounting
        |      (o)            (o)    |
         ----------------------------

2. Assembly Steps for 2020 Aluminum Profile / 3D Printer Frame:

Step	Hardware Used	Action
1. Motor Attachment	4 x M3 Screws ( $6 ext{mm} - 8 ext{mm}$ )	Fasten the NEMA 17 motor to the vertical face using M3 socket cap screws.
2. Frame Mounting	2 x M4 Screws + 2 x M4 T-Nuts	Insert M4 screws into base slots and secure to 2020 or 2040 V-slot aluminum extrusions.
3. Belt Tensioning	Hex Key Wrench	Slide the bracket along the base slots to set GT2 belt tension before tightening screws completely.

IMPORTANT INSTALLATION TIP: Ensure the M3 screws used to mount the motor into the bracket are no longer than $8 ext{mm}$ . Screws that are too long can push into the motor internal windings and cause electrical shorts or mechanical binding.

Applications

3D Printers: Mounting X, Y, and Z-axis drive motors on Creality Ender-3, CR-10, Prusa i3 clones, and Voron printers.
Desktop CNC Routers: Securing drive stepper motors on CNC 3018, 2418, and custom engraving machines.
Laser Engravers & Cutters: Motor mounting for high-speed gantry positioning.
Robotics & Linear Actuators: Mounting motors to linear guide rails, ball screw drives, and automated slider platforms.