AS · 81MM · 36-SLOT

⌀ 81.00 MM

SECTION A-A

REV — A.1

American Stator · 81 mm class

81 mm stator stack.

QDD actuator class — humanoid limbs, heavy-payload propulsion.

Coming Q4 2026

US Silicon Steel · Bonded

Outer dia.

81mm

Slots

36

Lam.

0.2mm

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Specification

Detailed spec.

Common to all 81 mm SKUs. Stack height, lamination grade, and bore tolerances are finalized with pre-launch partners.

Material: US Silicon Steel (M27 on request)
Lamination: 0.2 mm — Backlack bonded
Outer Ø: 81 mm (±0.05 mm typ.)
Slot count: 36
Stack height: TBD — selected with partner
Bore tolerance: H7 typical
MOQ: Single unit
Lead time: Catalog stock from Richmond, VA

Pairs with

Designed to pair with the matching rotor.

Rotor companion

81mm · 40-pole shell

Die-cast aluminum outrunner shell, magnet seats cast in. Bore and seats finish-machined.

P/N — RC-81-40

For

Where the 81 mm class lands.

01

Humanoid QDD

Knee, elbow, and shoulder quasi-direct-drive actuators.

02

Heavy multirotor

Group 3 UAS propulsion — 30+ kg AUW class.

03

Industrial AGV

Drive-wheel hub motors for mobile robotics.

Other sizes

The rest of the American Stator lineup.

Engage

Spec your motor program with us.

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