86 Stepper Motor + NMRV Worm Reducer-Full Size & Installation Guide
Pairing an 86 stepper motor with an NMRV worm reducer is one of the most cost-effective solutions for medium-torque positioning and transmission applications. This guide covers all matching dimensions, installation details and key notes to help you avoid common fit errors.
1. Core Matching Logic
The standard 86 stepper motor comes with an 86B5 mounting flange, which can be directly adapted to
NMRV050, NMRV063 and NMRV075 frame sizes with a custom input flange. No extra adapter plate
modification is needed, ensuring high coaxiality and low vibration during operation.
2. Full Size Matching Table
This table lists the exact dimensions for the most popular 86 stepper + NMRV combinations, which
you can use directly for your mechanical design:
| NMRV Frame Size | Custom Input Flange | Input Bore (mm) | Keyway Size | 86 Stepper Rated Torque Range |
| NMRV050 | 86B5 | 14 | 5mm × 5mm | 2.0 ~ 4.0 N·m |
| NMRV063 | 86B5 | 19 | 6mm × 6mm | 4.0 ~ 8.5 N·m |
| NMRV075 | 86B5 | 24 | 7mm × 7mm | 8.5 ~ 12.0 N·m |
.3.Installation Dimension Reference
●Total Length: The combined length of 86 stepper + NMRV063 is around 220mm, far more compact than a standard planetary reducer of the same torque level.
●Mounting Hole Pattern: The 86B5 flange has a 86mm square mounting hole pattern, which fully aligns with the custom input flange of the matched NMRV reducer.
●Output Shaft: The NMRV063 model uses a 25mm output shaft, which can directly connect to sprockets, couplings or drive wheels without extra reduction sleeves.
4. Key Installation Notes
1.Before mounting, clean the motor shaft and reducer input bore to remove any anti-rust oil, to avoid slipping during high torque output.
2.Tighten the set screw on the reducer input end at a 90° angle to the motor keyway, to ensure zero transmission gap.
3.For frequent start-stop positioning applications, select the low-backlash version with backlash ≤15 arc minutes, to prevent positioning accuracy loss.
4.The built-in self-locking feature of the NMRV reducer can hold the load in position after power off, no extra brake is required for most vertical or horizontal positioning scenarios.
✅ Free Resources You Can Get:
Full dimension PDF datasheet for 86 stepper + NMRV reducer combo
Downloadable 2D/3D CAD drawing for your selected model
1-on-1 technical support from our transmission engineer
Quick quotation within 24 hours for bulk orders