The Yamato LT-400B is a compact overhead (top-drive) laboratory stirrer main body with a well-balanced speed/torque profile for middle-viscosity work — 15–600 rpm at a rated 0.5 N·m. 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-400BA adds the stand, rod, shaft and propeller as a complete set.
Key Specifications
| SKU | LT-400B |
| Type | Overhead (top-drive) laboratory stirrer — main body only |
| Application | Middle-viscosity samples |
| Speed range | 15–600 rpm |
| Rated torque | 0.5 N·m (5.0 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 110 °C), safety cover |
| Power source | Single phase 100–120V ±10%, 50/60 Hz, 200VA |
| 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-400BA (adds stand + rod + shaft + 60 mm propeller) |
| List price | $1,225.00 |
Torque note: the operating manual prints the LT-400B torque as "0.5 N·m (6.0 kgf·cm)," a value that is internally inconsistent (0.5 N·m ≈ 5.1 kgf·cm); the marketing brochure prints "0.5 N·m (5.0 kgf·cm)." The 0.5 N·m figure agrees across both sources and is used here; confirm the kgf·cm rating with Yamato if that unit is required.
Application Profile
- Middle-viscosity mixing — the balanced speed/torque LT-400B suits everyday solutions and moderate suspensions.
- 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.
- Routine synthesis and prep — a light, economical overhead unit for daily stirring.
Overhead vs magnetic — pick the LT-400B when overhead drive is needed at a balanced speed/torque point. Step to the LT-400A (10–300 rpm, 0.9 N·m) for thicker samples, or the LT-400C (25–1200 rpm) for thinner samples at higher speed.
Design Architecture
A 35 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 110 °C coil temperature (recovery after ~30 min cooldown). A safety cover guards the rotating chuck. The brushless motor has no brushes to spark or replace. Housed in a 2.4 kg aluminum die-cast body (W146 x D154 x H165 mm) on 100–120V, 200VA.
Frequently Asked Questions
What speed and torque does the LT-400B provide? 15–600 rpm at a rated 0.5 N·m, tuned for middle-viscosity samples.
Is the LT-400B ready to use out of the box? No — it is the main body only. A stand, rod, stirring shaft, and propeller are required to operate; order the LT-400BA set to include them, or add the accessories individually.
Does it hold speed as viscosity changes? Yes — a 35 W DC brushless motor with feedback control keeps the set speed steady as viscosity changes mid-stir.
What shaft size does the chuck accept? A SUS drill chuck for a ø8 mm shaft.
Is a 220V version available? No — the LT-400B is 100–120V only; no 220V variant exists in the source. For other ranges, the LT-400A covers 10–300 rpm and the LT-400C 25–1200 rpm.
Ordering & Configuration
In the box: LT-400B 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-400BA 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 $1,225.00 the LT-400B 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-400 series: LT-400A (10–300 rpm) · LT-400B (15–600 rpm, this product) · LT-400C (25–1200 rpm). Complete sets: LT-400AA / -BA / -CA.
