Most buyers ask: Why not just buy a standard NEMA 17?
This motor provides a balance of torque and size, making it a standard choice for X, Y, and Z-axis movements in hobbyist machines. Frame Size: NEMA 17 (42mm x 42mm). Body Length: 40mm (indicated by the "40" in 4240). Rated Current: 1.5A per phase. Step Angle: 1.8° (200 steps per full revolution). Holding Torque: Approximately 0.4 N.m (Newton-meters). Shaft Type: 5mm "D" shaft for secure pulley or coupler attachment. LA hobby guy Wiring and Connection bachin stepper motor 4240-15a
| Microsteps | Steps/rev | Smoothness | Torque loss | |------------|-----------|------------|-------------| | Full (1) | 200 | Low | None | | Half (2) | 400 | Medium | ~5% | | Quarter (4) | 800 | Good | ~10% | | 1/16 | 3200 | Excellent | ~20% | Most buyers ask: Why not just buy a standard NEMA 17
Example with :
| Parameter | Value | |-----------|-------| | | 4240-15A | | Type | Bipolar, 2-phase hybrid stepper | | Step Angle | 1.8° (200 steps/rev) | | Rated Voltage | 4.0 V DC | | Rated Current | 1.5 A/phase | | Resistance per phase | 2.7 Ω ±10% | | Inductance per phase | 3.2 mH ±20% | | Holding Torque | 0.44 N·m (approx. 62 oz·in) | | Rotor Inertia | 54 g·cm² | | Weight | ~350 g | | Body length | 40 mm | | Mounting pattern | NEMA 17 (31mm hole spacing, M3 threads) | Body Length: 40mm (indicated by the "40" in 4240)
void loop() // 200 steps = 1 revolution for(int i = 0; i < 200; i++) digitalWrite(STEP_PIN, HIGH); delayMicroseconds(1000); // 500 µs low + 500 µs high = 1 ms period = 1000 steps/sec = 300 rpm digitalWrite(STEP_PIN, LOW); delayMicroseconds(1000);
This is a 2-phase, 4-wire motor, making it compatible with standard drivers like the A4988 , DRV8825 , or the TMC2240 .