The Yamato LT-500B is an overhead (top-drive) laboratory stirrer main body in the higher-power LT-500 class — a 65 W drive for middle-viscosity mixing at higher speed, 25–1200 rpm, rated 0.5 N·m (6.0 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-500BA adds the stand, rod, shaft and propeller as a complete set.
Key Specifications
| SKU | LT-500B |
| Type | Overhead (top-drive) laboratory stirrer — main body only |
| Application | Middle-viscosity samples (higher speed) |
| Speed range | 25–1200 rpm |
| Rated torque | 0.6 N·m (6.0 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-500BA (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-500B at 0.5 N·m (6.0 kgf·cm) with a 65 W motor. The separate LT/LR marketing brochure lists 0.6 N·m (6.0 kgf·cm) and a generic "30 W" motor. The kgf·cm figure (6.0) agrees; the N·m value differs — confirm with Yamato if that figure is load-bearing.
Application Profile
- Higher-speed middle-viscosity mixing — the 65 W LT-500 drive at 25–1200 rpm for solutions and moderate suspensions that benefit from more speed.
- 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 — higher-power motor and 400VA supply for demanding routine runs.
Overhead vs magnetic — pick the LT-500B when overhead drive is needed at higher speed for middle-viscosity work; step to the LT-500A (15–600 rpm, 0.9 N·m) when a thicker sample needs more torque at lower 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 (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 does the LT-500B include? The main body only — clamp holder, safety cover, chuck handle, manual and warranty card. A stand, rod, shaft and propeller are required to operate and are sold separately (or order the LT-500BA complete set).
What speed and torque does it deliver? 25–1200 rpm at 0.5 N·m (6.0 kgf·cm) from a 65 W DC brushless motor with feedback control, for higher-speed middle-viscosity mixing.
Main body or complete set — which do I need? Choose the LT-500B main body if you already have a stand and accessories; order the LT-500BA to include the stand, rod, shaft and 60 mm propeller.
When should I choose the LT-500A instead? Step to the LT-500A (15–600 rpm, 0.9 N·m) when a thicker sample needs more torque at lower speed.
What voltage does it use? 100–120V only — there is no 220V variant in the source.
Ordering & Configuration
In the box: LT-500B 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-500BA 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-500B 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) · LT-500B (25–1200 rpm, this product). Complete sets: LT-500AA / -BA. Lower-power siblings: LT-400A/B/C (35 W).
