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86S closed-loop stepper motor series

Manufacturer catalogue image · Series illustration

Stepper motors

86S closed-loop stepper motor series

SYN-TRON logoSYN-TRONView manufacturer →
Control
Closed-loop; compatible driver required
Insulation
Class B
Step Angle
1.8°
Holding Torque Options
3.6 / 4.6 / 8 N·m

Catalogue series · Exact configuration and availability confirmed by the manufacturer.

Replacing an 86S motor? Keep the winding suffix and drive revision in the comparison

The July 2026 86S sheet lists AS, BS and DS versions with 3.6, 4.6 and 8.0 N·m holding torque. All three are two-phase 1.8° motors, but BS is listed at 5.5 A while AS and DS are 6.0 A. An older driver manual’s abbreviated motor name is not enough to identify the current winding or approve a replacement.

Match one complete motor row to the proposed move

The references below come from the current motor sheet. Its typical driver is SS-20806, but motor and driver revisions still need to agree. Holding torque is a static value, not the torque guaranteed at your operating speed.

AS · 86SBYG250AS-SAKSML-0601Catalogue code 033310: 3.6 N·m holding torque, 6.0 A static phase current, 0.33 Ω resistance and 2.48 mH inductance. Its mass is 2.15 kg, rotor inertia 1000 g·cm² and drawing length L 84 mm. The AS curve printed in the same sheet is labelled with a 0551 ending, whereas this selection row ends 0601. Ask for the curve matching the offered winding rather than assuming they describe the same configuration.
BS · 86SBYG250BS-SAKSML-0551Catalogue code 033300: 4.6 N·m holding torque, 5.5 A, 0.46 Ω and 4 mH. Mass is 2.65 kg, inertia 1400 g·cm² and L 96.4 mm. Its plotted curve is labelled 48 V and a 0.9° command step, with normal and overload lines. Use the normal operating envelope for sustained motion. The old standard driver manual describes its adapted 86 motor as 6 A, so confirm the setup for this 5.5 A winding instead of copying an old cabinet setting.
DS · 86SBYG250DS-SAKSML-0601Catalogue code 033320: 8.0 N·m holding torque, 6.0 A, 0.44 Ω and 3.73 mH. Mass rises to 3.95 kg, inertia to 2700 g·cm² and L to 136 mm. That extra size and inertia matters in a rapid start/stop axis. The sheet does not supply a DS running curve, so request one for the actual drive and supply before treating its larger holding torque as a solution to a high-speed load problem.

A practical fit check for the keyed metric versions above

These checks use the 86S outline drawing and naming diagram. Include an old nameplate photograph, coupling details and the actual move profile with the inquiry. A matching family label does not settle the fit.

CheckWhat the current drawing or code saysWhat to compare on the machine
Motor face and holes 85 mm face; 69.6 mm hole spacing; four Ø6.5 mm holes Existing flange pattern and fastener clearance
Shaft interface 14 mm nominal shaft with keyway for these SAKSML versions Coupling bore, key detail and shaft projection against the drawing
Locating register 73 mm nominal register; manufacturer requires register location Register fit and motor/load shaft alignment, not just bolt alignment
Length and harness clearance L is 84 / 96.4 / 136 mm for AS / BS / DS Space behind the flange and room for both motor and feedback cables
Feedback identification S after 86 denotes a 1000-line incremental encoder Complete connector/pin definition and the delivered harness method
Drive approval Current sheet names SS-20806; winding current varies by exact row Driver hardware/revision, current configuration, supply and requested speed/acceleration

CATALOGUE OVERVIEW

About this motor series

The SYNTRON 86S family combines a two-phase hybrid stepper motor with feedback for use in a compatible closed-loop drive system. Published holding-torque options are 3.6 / 4.6 / 8 N·m, depending on the motor length and winding. The catalogue specifies a 1.8-degree step angle and class B insulation.

Provide the required running torque, speed, inertia and positioning cycle when requesting a quotation. Confirm encoder compatibility, cable pinout and the chosen driver together with the motor; feedback does not remove the need to size the axis mechanically.

Model / series reference: 86S

Published specifications

Specifications describe a series range; confirm which ratings apply together to the quoted model.

Control
Closed-loop; compatible driver required
Insulation
Class B
Step Angle
1.8°
Holding Torque Options
3.6 / 4.6 / 8 N·m
Power
Confirm configuration
Voltage
Confirm supply
Speed
Model dependent
Catalogue Type
Product series

Confirm mounting and shaft dimensions against the drawing for the quoted configuration.

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