The Yamato LR-500AA is the complete-set configuration of the LR-500A overhead stirrer — the LR-500A digital main body plus the stand and rod needed to mount and run it, packaged together. It is the same high-torque, low-speed overhead stirrer (gearless direct-drive, 34–340 rpm, 1.96 N·m / 20 kgf·cm, 70 W brushless motor) delivered ready to operate rather than as a bare main body. The $315 premium over the LR-500A main body is the added stand and rod.
Key Specifications
| SKU | LR-500AA |
| Type | Overhead (top-drive) digital laboratory stirrer — complete set (main body + stand + rod) |
| Speed range | 34–340 rpm (no load) |
| Max torque | 1.96 N·m (20 kgf·cm) |
| Motor | Brushless DC, 70 W |
| Drive | Gearless direct-drive |
| Shaft diameter | ø10 mm |
| Speed control | Speed feedback control (holds set rate under changing load) |
| Display | Digital 3-digit speed / green-LED torque, 2 steps + overload display |
| Safety | Stops automatically when overloaded |
| Power source | AC 100–125V, 3A, 50/60 Hz |
| Included | LR-500A main body, stand, rod, stainless-steel stirring shaft (ø10 x 500 mm), 75 mm 4-blade propeller, clamp |
| Main-body-only SKU | LR-500A ($1,886.50) |
| Speed twin (set) | LR-500BA (100–1000 rpm, 0.98 N·m) |
| List price | $3,145.00 |
Author confidence note: the stirrer specifications are fully itemized in the LT/LR brochure. The stand and rod are listed there generically as an "operational accessory" without a dimensioned part number in this brochure — confirm exact stand/rod specification with Yamato at order.
Application Profile
- High-viscosity mixing — thick solutions, gels, slurries, polymers and resins where torque, not speed, is the limiting factor.
- Turn-key overhead stirring — arrives mounted-ready with stand and rod, so no separate stand purchase is needed.
- Overhead stirring of large / open vessels — top-driven stirring reaches volumes and geometries a magnetic stir bar cannot serve.
- Homogenization and blending — controlled low-speed shear for suspensions and emulsions.
Overhead vs magnetic — when to pick the LR-500AA: choose an overhead set when the sample is too viscous for a magnetic stir bar to hold coupling or the vessel is large/non-flat-bottomed, and you want a complete stand-mounted rig out of the box. The LR-500A drive targets the most viscous end; for higher-speed medium-viscosity work as a set, see the LR-500BA.
Design Architecture
The LR-500AA is the LR-500A drivetrain on a stand. A 70 W brushless DC motor turns the ø10 mm shaft directly (gearless direct-drive) at 34–340 rpm, delivering the full 1.96 N·m to the sample with no gear noise or gear wear. The brochure notes the brushless motor's safety advantage — no brushes, no sparks, no brush replacement.
Speed feedback control holds the set rate despite viscosity changes mid-stir (the brochure flags this as especially valuable for high-viscosity samples). Load appears on a green-LED two-step + overload torque display beside a 3-digit tachometer; exceeding maximum load lights the overload lamp and stops the motor automatically. The included stand and rod provide the mounting the bare main body lacks.
Frequently Asked Questions
What speed and torque does the LR-500AA deliver? 34–340 rpm with up to 1.96 N·m (20 kgf·cm) — a high-torque, low-speed stirrer built for viscous samples, driven by a 70 W gearless direct-drive brushless motor.
What comes in the complete set? The LR-500A main body, stand, rod, stainless-steel stirring shaft (ø10 x 500 mm), 75 mm 4-blade propeller, and clamp.
How does the LR-500AA differ from the LR-500A? The LR-500AA is the turn-key set including the stand and rod; the LR-500A is the bare main body. Choose the LR-500A only if a stand already exists.
When should I choose this over the LR-500BA? Pick the LR-500AA (34–340 rpm / 1.96 N·m) for the most viscous samples where torque limits; step to the LR-500BA (100–1000 rpm / 0.98 N·m) for higher-speed medium-viscosity work.
What power does it require? AC 100–125V (115V nominal), 3A, 50/60 Hz.
Ordering & Configuration
In the box: LR-500A main body, stand, rod, stainless-steel stirring shaft (ø10 x 500 mm), 75 mm 4-blade propeller, and clamp — a complete stand-mounted stirring rig.
Optional accessories: propellers in various types/sizes, vacuum adapter, extra-long stirring shaft (ø10 x 800 mm), glass stirring shaft.
At $3,145.00 the LR-500AA is quoted rather than added directly to cart. Confirm at quote:
- Set vs main body — LR-500AA (this SKU, includes stand + rod) vs LR-500A main body ($1,886.50) if a stand already exists.
- Speed/viscosity fit — 34–340 rpm / 1.96 N·m (this set) vs LR-500BA's 100–1000 rpm / 0.98 N·m.
- Shaft, propeller and stand — confirm the exact stand/rod specification and any long-shaft / alternate-propeller needs.
Warranty: per Yamato standard terms — confirm at quote.
LR-500 family: LR-500AA (34–340 rpm set, this product) · LR-500BA (100–1000 rpm set) · LR-500A / LR-500B (main bodies only).
