Which kit has more torque?

B, at 12 Nm (1699 oz-in) versus 9 Nm (1274.5 oz-in) for A. That is about 33% more holding torque.

Is the extra $10 worth it for B?

Yes if your machine needs the torque and can carry a 187.6mm, 5.0kg motor. If 9 Nm is enough, A saves money and space.

Do both kits use the same driver?

Yes. Both include the CL86T V4.1 driver with 18-80VAC or 24-110VDC input and 0-200kHz pulse input. B lists a slightly higher 8.2A peak output.

Which is better for a small CNC router?

A is usually the better fit. Its 137mm body is easier to mount, and 9 Nm is plenty for most hobby and light industrial routers.

Which motor holds torque better at high speed?

A, on paper. Its lower inductance (3.6mH versus 7.3mH) means current rises faster, so it keeps more torque as step rate climbs.

What comes in each box?

Both include the motor, the CL86T V4.1 driver, 1.7m motor and encoder cables, and an RS232 debugging cable.

Closed Loop NEMA 34 Stepper Motor (1274 oz-in 14mm single shaft) and Mating Driver vs Closed Loop NEMA 34 Stepper Motor (1699 oz-in 14mm single shaft) and Mating Driver

Buy the 1274 oz-in kit (A) for smaller machines, tight budgets, or builds where a 137mm motor body fits and 9 Nm is enough. Buy the 1699 oz-in kit (B) when you need maximum torque and can carry a longer, heavier motor. Both use the same CL86T V4.1 driver, so the real difference is the motor. Prices are close: $144.99 at Amazon for A and $155.00 at Amazon for B, both as of November 4, 2026.

Today the Closed Loop NEMA 34 Stepper Motor (1274 oz-in 14mm single shaft) and Mating Driver costs $10.01 less at its best price.

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