Nema 23 Stepper Motor

• $40 - 425 oz in, 3Nm (27 in lb)- [1]
• $30 for 1.9Nm - (17 in lb) [2]
• Note: 20 tooth pulley = 1/4" radius - so multiply above values by 4 for actual force

Issue

Most motors come with 6.35 mm shaft, not 8. 10 mm are common as well. 8 mm is the unique one.

10 mm Shaft

• 425 oz in - [3]
• $32 - [4]

8 mm Shaft

• $48 on prime - [5]
• Long ship - https://www.robotdigg.com/product/89/8mm-shaft-high-torque-nema23-Stepper-Motor
• Long ship - [6]
• Not Nema 23 but Nema 17 with geardown - [7].

Shaft stepping

• Coupler from 6.35 to 10 mm - [8]