The Yamato LT-500A is an overhead (top-drive) laboratory stirrer main body in the higher-power LT-500 class — a 65 W drive (versus 35 W in the LT-400 series) for middle-viscosity mixing at 15–600 rpm, rated 0.9 N·m (9.0 kgf·cm). A maintenance-free DC brushless motor with sensitive feedback control holds the set speed as viscosity changes during a stir. Sold as the main body; the LT-500AA adds the stand, rod, shaft and propeller as a complete set.
Key Specifications
| SKU | LT-500A |
| Type | Overhead (top-drive) laboratory stirrer — main body only |
| Application | Middle-viscosity samples |
| Speed range | 15–600 rpm |
| Rated torque | 1.0 N·m (10.0 kgf·cm) |
| Motor | DC brushless, B-type insulation, 30 W output |
| Rotation control | Feedback control |
| Panel | 4-digit digital speed, overload indication, torque indicator (20% per scale) |
| Chuck | SUS drill chuck for ø8 mm shaft |
| Safety | Current-limiting circuit, thermal protector (motor coil 90 °C), safety cover |
| Power source | Single phase 100–120V ±10%, 50/60 Hz, 400VA |
| Power cord | 3-pin plug, 2 m |
| External dimensions | W146 x D154 x H165 mm |
| Weight | 2.4 kg |
| Included | Clamp holder, safety cover, chuck handle, operating manual, warranty card |
| Complete set SKU | LT-500AA (adds stand + rod + shaft + 60 mm propeller) |
| List price | $1,480.00 |
Spec-source note: figures here follow the LT400A/500B operating manual (the assigned source), which rates the LT-500A at 0.9 N·m (9.0 kgf·cm) with a 65 W motor. The separate LT/LR marketing brochure lists 1.0 N·m (10.0 kgf·cm) and a generic "30 W" motor. Confirm the exact torque with Yamato if that figure is load-bearing for a purchase.
Application Profile
- Middle-viscosity mixing with headroom — the 65 W LT-500 drive carries more sustained load than the 35 W LT-400 units at the same speed band.
- General-purpose overhead stirring — top-driven mixing for vessels a magnetic stir bar cannot serve.
- Quiet-bench operation — noise-prevention design for shared and instrument-sensitive labs.
- Longer / heavier stirring duty — the higher-power motor and 400VA supply suit more demanding routine runs.
Overhead vs magnetic — pick the LT-500A when overhead drive is needed for middle-viscosity samples with more power headroom than the LT-400 series; step to the LT-500B (25–1200 rpm) for thinner samples at higher speed.
Design Architecture
A 65 W DC brushless motor (B-type insulation) drives a ø8 mm SUS drill chuck through a feedback control loop that keeps the set speed steady as viscosity changes mid-stir. Speed and load appear on a 4-digit digital readout with overload indication and a torque indicator graduated in 20% steps.
Protection is layered: a current-limiting circuit throttles current when load exceeds maximum torque, and a thermal protector cuts motor current at a 90 °C coil temperature (lower than the LT-400's 110 °C threshold; recovery after ~30 min cooldown). A safety cover guards the rotating chuck. Housed in a 2.4 kg aluminum die-cast body (W146 x D154 x H165 mm) on 100–120V, 400VA.
Frequently Asked Questions
What speed and torque does the LT-500A deliver? 15–600 rpm with 0.9 N·m (9.0 kgf·cm) per the manual, from a 65 W DC brushless motor — a middle-viscosity drive with more headroom than the 35 W LT-400 series.
Is the LT-500A a complete stirrer? No — it is the main body only. A stand, rod, stirring shaft, and propeller are required to operate and are sold separately; the LT-500AA set includes them.
How does it differ from the LT-500B? The LT-500A runs 15–600 rpm for middle-viscosity samples; step to the LT-500B (25–1200 rpm) for thinner samples at higher speed.
How does feedback control help? It holds the set speed steady as viscosity changes mid-stir, with load shown on a 4-digit digital readout with overload indication and a 20%-graduated torque indicator.
What power does it require? Single-phase 100–120V ±10%, 50/60 Hz, 400VA. There is no 220V variant in the source.
Ordering & Configuration
In the box: LT-500A main body, clamp holder, safety cover, chuck handle, operating manual and warranty card. A stand, rod, stirring shaft and propeller are required to operate and are sold separately — order the LT-500AA set to include them, or add the accessories individually (Y-shaped rack 231086; ø8 x 500 mm shaft 231384; 60 mm 4-blade propeller 231076; other propeller sizes available).
At $1,480.00 the LT-500A is a direct add-to-cart benchtop unit. It is a main body only — confirm you have (or are ordering) a stand, rod, shaft and propeller. Supply is 100–120V only; no 220V variant in the source.
Warranty: one year from purchase per Yamato terms (repair-parts holding period 7 years after end of production).
LT-500 series: LT-500A (15–600 rpm, this product) · LT-500B (25–1200 rpm). Complete sets: LT-500AA / -BA. Lower-power siblings: LT-400A/B/C (35 W).
