RC · 81MM · 40-POLE

⌀ 81.00 MM

SECTION B-B

REV — A.1

Rotor Castings · 81 mm class

81 mm rotor shell.

High-pole-count shells for QDD humanoid + heavy UAS class.

Coming Q4 2026

A380 · Die Cast

Outer dia.

81mm

Poles

40

Material

A380cast

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Specification

Detailed spec.

Common to all 81 mm SKUs. As-cast wall thickness, magnet seat geometry, and mounting features are finalized with pre-launch partners.

Material: A380 die-cast aluminum (A356-T6 on request)
Outer Ø: 81 mm (±0.05 mm typ.)
Pole count: 40
Format: Net-shape casting · finish-machined bore + seats
Features: Integral closed end · Mounting bosses · Magnet seats per profile
Wall thickness: TBD — as-cast, selected with partner
MOQ: Single unit
Lead time: Catalog stock from Richmond, VA

Pairs with

Designed to pair with the matching stator.

Stator companion

81mm · 36-slot stack

Bonded silicon-steel laminations. Catalog SKU, ships from Richmond.

P/N — AS-81-36

For

Where the 81 mm class lands.

01

Humanoid QDD

40-pole shells for knee, elbow, shoulder QDD modules.

02

Heavy UAS

Group 3 propulsion motor shells.

03

Hub drives

AGV wheel motor + industrial conveyor drives.

Other sizes

The rest of the Rotor Castings lineup.

Engage

Spec your motor program with us.

Send a letter of interest Email Mason directly