{"product_id":"lab-stirrer-digital-main-body-100-1000-rpm-stainless-shaft-75mm-4-blade-propeller-lr-500b","title":"Yamato LR500B Lab Stirrer Digital Main Body (100~1000 rpm), Stainless Shaft \u0026 75Mm 4-Blade Propeller","description":"\u003ch2\u003eLab Stirrer Digital Main Body (100~1000 rpm), Stainless Shaft \u0026amp; 75Mm 4-Blade Propeller Overview\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eLab Stirrer Digital Main Body (100~1000 rpm), Stainless Shaft \u0026amp; 75Mm 4-Blade Propeller\u003c\/strong\u003e (model LR500B) is a digital overhead laboratory stirrer from Yamato Scientific, supplied by LabSupplies.com as an authorized dealer. This unit drives medium-viscosity samples across a 100–1000 rpm range with up to 0.98 N·m (10 kgf·cm) of torque.\u003c\/p\u003e\u003cp\u003eA gearless direct-drive design transmits power through a ø10 mm stainless shaft, removing gear backlash. The 100 W DC brushless motor pairs with speed feedback control, holding the set speed as sample viscosity shifts. Readouts come from a digital 3-digit speed display, while an LED indicator flags torque load and overload conditions.\u003c\/p\u003e\u003cp\u003eOperation runs on a standard 115V supply. Each SET ships with the stirring shaft (ø10 × 500 mm), a 75 mm 4-blade propeller, and a clamp, so the assembly arrives ready to mount. Footprint, weight, and country of origin are listed as Contact for specification.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed range:\u003c\/strong\u003e continuous 100–1000 rpm for medium-viscosity samples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed feedback control:\u003c\/strong\u003e maintains the set speed despite viscosity change during a run.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor and torque:\u003c\/strong\u003e 100 W DC brushless motor delivering up to 0.98 N·m (10 kgf·cm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGearless direct drive:\u003c\/strong\u003e ø10 mm shaft transmits power directly, eliminating gear backlash.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital display:\u003c\/strong\u003e 3-digit speed readout with an LED torque\/overload indicator.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety devices:\u003c\/strong\u003e overload stop, current-limit circuit, and thermal motor protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to Choose the Right Stirrer\u003c\/h2\u003e\u003cp\u003eMatching an overhead stirrer to your workflow comes down to torque, speed behavior, and the control and safety features your protocol requires. Use the criteria below to confirm fit .\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorque and motor:\u003c\/strong\u003e higher torque handles thicker media; the LR500B 100 W brushless motor provides up to 0.98 N·m for medium-viscosity work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed range and control:\u003c\/strong\u003e verify the rpm window covers your protocol; speed feedback control holds the setpoint as viscosity shifts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive type:\u003c\/strong\u003e gearless direct drive reduces backlash and maintenance versus geared transmissions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e confirm the 115V supply matches your bench circuit before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety devices:\u003c\/strong\u003e overload stop, current-limit, and thermal protection guard the motor and sample during long runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft and impeller:\u003c\/strong\u003e match shaft length and propeller style to your vessel; this set includes a ø10 × 500 mm shaft and 75 mm 4-blade propeller.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e115V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed Range\u003c\/td\u003e\n\u003ctd\u003e100–1000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Torque\u003c\/td\u003e\n\u003ctd\u003e0.98 N·m (10 kgf·cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor\u003c\/td\u003e\n\u003ctd\u003eDC brushless, 100 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSample Viscosity\u003c\/td\u003e\n\u003ctd\u003eMedium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eDigital overhead laboratory stirrer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed Control\u003c\/td\u003e\n\u003ctd\u003eSpeed feedback control — maintains set speed despite viscosity change\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eDigital 3-digit speed display with LED torque\/overload indicator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Devices\u003c\/td\u003e\n\u003ctd\u003eOverload stop; current-limit circuit and thermal motor protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive\u003c\/td\u003e\n\u003ctd\u003eGearless direct drive, ø10 mm shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003eStirring shaft (ø10 × 500 mm), 75 mm 4-blade propeller, clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eAvailable Sizes and Configurations\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003cth\u003ePack\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLR-500B\u003c\/td\u003e\n\u003ctd\u003eSET\u003c\/td\u003e\n\u003ctd\u003eSET\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eMore in This Series\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lab-stirrer-digital-main-body-34-340-rpm-stainless-shaft-75mm-4-blade-propeller-lr-500a\"\u003eLab Stirrer Digital Main Body (34~340 rpm), Stainless Shaft \u0026amp; 75mm 4-Blade Propeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lr-500a-set-main-body-stand-rod-stainless-steel-shaft-and-75mm-4-blade-propeller-lr-500aa\"\u003eLR-500A Set Main Body, Stand, Rod, Stainless Steel Shaft And 75mm 4-Blade Propeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lr-500b-set-main-body-stand-rod-stainless-steel-shaft-and-75mm-4-blade-propeller-lr-500ba\"\u003eLR-500B Set Main Body, Stand, Rod, Stainless Steel Shaft And 75mm 4-Blade Propeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lt-500a-set-main-body-stand-rod-stainless-steel-shaft-and-60mm-4-blade-propeller-lt-500aa\"\u003eLT-500A Set Main Body, Stand, Rod, Stainless Steel Shaft And 60mm 4-Blade Propeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lt-500b-set-main-body-stand-rod-stainless-steel-shaft-and-60mm-4-blade-propeller-lt-500ba\"\u003eLT-500B Set Main Body, Stand, Rod, Stainless Steel Shaft And 60mm 4-Blade Propeller\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/strong-magnetic-stirrer-with-hot-plate-50-to-1600-rpm-mfh-800\"\u003eStrong Magnetic Stirrer With Hot Plate, 50 To 1600 rpm\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/laboratory-stirrers\"\u003eView all Laboratory Stirrers →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eWhy Buy From LabSupplies.com\u003c\/h2\u003e\u003cp\u003eLabSupplies.com sells the Yamato Scientific LR500B as an authorized dealer, so every unit is a genuine factory product backed by the manufacturer warranty. Our lab-equipment specialists answer spec questions directly and ship from USA inventory.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorized Yamato Scientific dealer:\u003c\/strong\u003e genuine unit with full manufacturer warranty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn stock:\u003c\/strong\u003e ready to order now, no backorder wait.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShips from USA inventory:\u003c\/strong\u003e domestic fulfillment for faster delivery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLab-equipment specialists:\u003c\/strong\u003e direct support for configuration and spec questions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the speed range of the LR500B stirrer?\u003c\/h3\u003e\u003cp\u003eThe LR500B runs continuously from 100 to 1000 rpm. Speed feedback control maintains your setpoint even as sample viscosity changes during a run.\u003c\/p\u003e\n\u003ch3\u003eHow much torque does the LR500B deliver?\u003c\/h3\u003e\u003cp\u003eMaximum torque is 0.98 N·m (10 kgf·cm), produced by a 100 W DC brushless motor. This output suits medium-viscosity samples.\u003c\/p\u003e\n\u003ch3\u003eDoes the LR500B run on a standard 115V circuit?\u003c\/h3\u003e\u003cp\u003eYes, the LR500B operates on 115V. Confirm that your bench outlet matches this voltage before installation.\u003c\/p\u003e\n\u003ch3\u003eWhat accessories are included with the LR500B?\u003c\/h3\u003e\u003cp\u003eEach set includes a stirring shaft (ø10 × 500 mm), a 75 mm 4-blade propeller, and a clamp. The unit arrives ready to mount.\u003c\/p\u003e\n\u003ch3\u003eWhat drive system does this stirrer use?\u003c\/h3\u003e\u003cp\u003eThe LR500B uses a gearless direct drive with a ø10 mm shaft. Direct transmission eliminates gear backlash and reduces maintenance.\u003c\/p\u003e\n\u003ch3\u003eWhat safety features protect the motor during long runs?\u003c\/h3\u003e\u003cp\u003eSafety devices include an overload stop, a current-limit circuit, and thermal motor protection. An LED indicator also signals torque load and overload.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/labsupplies.com\/products\/lab-stirrer-digital-main-body-100-1000-rpm-stainless-shaft-75mm-4-blade-propeller-lr-500b#product\",\n      \"name\": \"Yamato LR500B Lab Stirrer Digital Main Body (100~1000 rpm), Stainless Shaft \u0026 75mm 4-Blade Propeller\",\n      \"sku\": \"LR-500B\",\n      \"mpn\": \"LR-500B\",\n      \"brand\": {\n        \"@type\": \"Brand\",\n        \"name\": \"Yamato Scientific\"\n      },\n      \"manufacturer\": {\n        \"@type\": \"Organization\",\n        \"name\": \"Yamato Scientific\"\n      },\n      \"url\": \"https:\/\/labsupplies.com\/products\/lab-stirrer-digital-main-body-100-1000-rpm-stainless-shaft-75mm-4-blade-propeller-lr-500b\",\n      \"dateModified\": \"2026-06-29\",\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"USD\",\n        \"price\": \"2695.00\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"url\": \"https:\/\/labsupplies.com\/products\/lab-stirrer-digital-main-body-100-1000-rpm-stainless-shaft-75mm-4-blade-propeller-lr-500b\",\n        \"seller\": {\n          \"@type\": \"Organization\",\n          \"name\": \"LabSupplies.com\"\n        }\n      },\n      \"image\": \"https:\/\/dl.dropboxusercontent.com\/scl\/fo\/02jn6wbbh1yhzaqkcyplw\/h\/LR500.png?rlkey=wtjo5lqeg5sku9a3506qrpssx\",\n      \"description\": \"LR500B digital overhead stirrer: 100–1000 rpm, 0.98 N·m torque, 100 W brushless motor. 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