{"publisher":"Xirkit — the structured parts marketplace","canonical":"https://www.xirkit.io/products/pololu-20-4-1-25d-lp-12v-gearmotor-ccf2","markdown":"https://www.xirkit.io/products/pololu-20-4-1-25d-lp-12v-gearmotor-ccf2/data.md","mcp":"https://www.xirkit.io/mcp","note":"Every value is traced to a cited source (see sources and per-value src). Null means unknown, never zero.","record":{"id":"ccf2ac3f-fd71-56be-a3f8-bdb6f1a58e6a","mpn":"3251","name":"Pololu 20.4:1 25D LP 12V Gearmotor","manufacturer":"Pololu","family":"motor","summary":"A 12 V, 20.4:1 brushed DC gearmotor with 280 RPM no-load speed.","schema_version":"3.0","revision":null,"tags":["12V","brushed DC","20.4:1","4mm shaft","robotics","LP"],"sources":[{"other":{},"id":"pololu-product","url":"https://www.pololu.com/product/3251","title":"Pololu 3251 product specifications","publisher":"Pololu","kind":"manufacturer","retrieved_at":"2026-09-15T12:01:25Z","field_paths":["spec.rated_voltage_v","spec.motor_type","spec.stall_torque_nm","spec.no_load_speed_rpm","spec.no_load_current_a","spec.stall_current_a","spec.gear_ratio","spec.offers"],"notes":"Stall values are extrapolated at 12 V, not continuous operating limits. Torque conversion uses 1 kgf·cm = 0.0980665 N·m."},{"other":{},"id":"pololu-specs","url":"https://www.pololu.com/product/3251/specs","title":"Pololu 3251 dimensions and performance","publisher":"Pololu","kind":"manufacturer","retrieved_at":"2026-09-15T12:01:25Z","field_paths":["spec.dimensions","spec.shaft_diameter_mm","spec.body_diameter_mm","spec.body_length_mm","spec.encoder"],"notes":"Body is nominal 25D x 50L mm, excludes protruding shaft; do not use as complete assembly envelope."}],"assets":[{"other":{},"kind":"documentation","url":"https://www.pololu.com/product/3251/resources","label":"Manufacturer datasheet and dimension drawing","verification":"manufacturer","notes":""},{"other":{},"kind":"datasheet","url":"https://www.pololu.com/file/0J1829/pololu-25d-metal-gearmotors.pdf","label":"25D gearmotor family datasheet","verification":"manufacturer","notes":"Select the exact 20.4:1 LP 12 V row."}],"offers":[{"other":{},"supplier":"Pololu","url":"https://www.pololu.com/product/3251","currency":"USD","unit_price":29.95,"stock_status":"unknown","region":"US","minimum_quantity":1,"checked_at":"2026-09-15T12:01:25Z","lead_time_days_min":null,"lead_time_days_max":null,"destination":"US","destination_postal_code":null,"notes":"US quantity-one price. Backorders are allowed; stock quantity and delivery ETA were not established. Destination postal code has not been supplied."}],"best_for":[{"other":{},"label":"Small robot drive systems","reason":"Metal reduction gears and a D-shaft suit wheel drives; calculate required torque and duty cycle.","basis":"engineering_inference"},{"other":{},"label":"Lower current mechanisms","reason":"The LP version has a lower 12 V stall-current demand.","basis":"engineering_inference"}],"children":[],"spec":{"usage":{"requirements":{"rated_voltage_v":12,"stall_current_a":0.9,"no_load_current_a":0.05}},"geometry":{"cad":{"bbox":{"width_mm":25,"height_mm":70,"length_mm":25},"features":[],"mesh_path":"pololu_25d_204_lp_12v.stl","step_path":"pololu_25d_204_lp_12v.step","assumptions":[],"verification":"generated","envelope_complete":false,"footprint_svg_path":null},"other":{"review_status":"reviewed","torque_test_condition":"12 V; extrapolated stall, not continuous","assembly_envelope_complete":false},"dimensions":{"other":{},"width_mm":25,"height_mm":25,"length_mm":50},"shaft_profile":"D","body_length_mm":50,"body_diameter_mm":25,"shaft_diameter_mm":4,"shaft_extension_mm":12.5},"provides":{"feedback":"none","gear_ratio":20.4,"motor_type":"brushed_dc_gearmotor","stall_torque_nm":0.2353596,"no_load_speed_rpm":280},"compliance":{},"constraints":{"thermal":{"notes":null,"other":{},"case_temp_max_c":null,"case_temp_min_c":null,"junction_temp_max_c":null,"operating_temp_max_c":null,"operating_temp_min_c":null,"thermal_resistance_c_per_w":null}}},"other":"Stall torque/current cannot be used as continuous ratings. Body dimensions exclude 12.5 mm projecting shaft and terminal protrusions. No encoder; encoder-equipped siblings are different products.","source_type":"url","source_ref":"https://www.pololu.com/product/3251","design":{"assets":[{"other":{},"kind":"documentation","url":"https://www.pololu.com/product/3251/resources","label":"Manufacturer datasheet and dimension drawing","verification":"manufacturer","notes":"","resolved_url":"https://www.pololu.com/product/3251/resources"},{"other":{},"kind":"datasheet","url":"https://www.pololu.com/file/0J1829/pololu-25d-metal-gearmotors.pdf","label":"25D gearmotor family datasheet","verification":"manufacturer","notes":"Select the exact 20.4:1 LP 12 V row.","resolved_url":"https://www.pololu.com/file/0J1829/pololu-25d-metal-gearmotors.pdf"}],"cad":{"verification":"generated","envelope_complete":false,"assumptions":[],"step_path":"pololu_25d_204_lp_12v.step","mesh_path":"pololu_25d_204_lp_12v.stl","footprint_svg_path":null,"bbox":{"length_mm":25,"width_mm":25,"height_mm":70},"features":[],"step_url":"https://wlrumvsjnliyuuvzwnrt.supabase.co/storage/v1/object/public/geometry/pololu_25d_204_lp_12v.step","mesh_url":"https://wlrumvsjnliyuuvzwnrt.supabase.co/storage/v1/object/public/geometry/pololu_25d_204_lp_12v.stl","footprint_svg_url":null},"limitations":["Generated geometry is an approximate mechanical envelope; inspect original manufacturer CAD when available.","Generated footprint_svg_path is an outline, not a verified electrical land pattern.","Xirkit does not run fit checks; download step_url and test fit against your own enclosure."]}}}