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The Makita USA Inc. 419566-3 Switch Knob (also designated as KNOB SWCH 9553NB, 4195663, or 419566 3) is an Original Equipment Manufacturer (OEM) industrial component designed and manufactured by Makita Corporation. Positioned structurally as Item 049-1 or schematic reference 49, this mechanical interface element serves as the physical slider button mounted to the exterior of the tool's motor housing to actuate the internal link mechanics required to cycle the power of industrial-grade handheld rotating equipment.
Features
Tactile Continuous-Run Lock: Features an ergonomic stepped forward lip that hooks onto the primary motor housing cutout, removing the requirement for sustained operator hand-pressure during long grinding cycles.
Integrated Safety Quick-Release: Designed with a balanced fulcrum point where pressing the rear edge of the knob causes the locked front tab to immediately disengage from the tool body frame, snapping back via the internal machine compression spring to default OFF.
Textured High-Friction Top Ridge: Molded with integrated cross-grooves or raised geometric checkering to ensure positive traction and direct mechanical manipulation when operating with thick industrial leather welding gloves or when surfaces are coated in metalworking fluids, slate dust, or oil.
Integrated Hook Sub-Assembly: Employs a downward-facing catch-hook engineered to seat firmly into the matching notch of the interior link bar, eliminating loose mechanical play and ensuring responsive machine startup.
Specifications
Manufacturer: Makita USA Inc.
Part Number: 419566-3
Alternate Part Numbers: 4195663, 419566 3, KNOB SWCH 9553NB
Schematic Reference: Item 049-1 / Item 49
Net Weight: ~18.14 grams (0.04 lbs)
Gross Packed Weight: 0.05 lbs
Physical Envelope (Imperial Nominal): 0.80" (L) x 0.80" (W) x 0.80" (H)
Physical Envelope (Maximum Dynamic Clearance): 1.00" Length x 0.75" Width x 0.50" Height
Metric Form Factor: 25.0 mm x 25.0 mm x 25.0 mm
Actuator Typology: Mechanical Slide / Push Button Lock-On Type
Kinematic Travel Profile: Dual-position bistable switch matrix. Linear forward translation initiates the ON circuit state; downward orthogonal compression on the leading lip locks the switch into continuous-run profile. Rear-ward downward pivot unlocks the retention mechanism and returns the spring-loaded assembly to the default OFF state.
Enclosure / Environmental Ingress Resistance: Designed to interface with tool housings meeting IP54 International Protection Ratings when correctly installed over internal gaskets
Compatible Metal Nibblers & Power Shears: BJN160, BJN161, DJN160, DJN161, BJS160, BJS161, DJS160, DJS161
Compatible Drywall / Cut-Out Tools: DCO180
Field Replacement Protocol: 1. Isolation of Energy Sources: Disconnect AC power cord or extract Lithium-Ion battery pack. 2. Fastener Disassembly: Remove single casing screw (Tapping Screw 4x18, Item 055) retaining the rear motor housing cover. 3. Cover Extraction: Slide rear protective cover (Rear Cover, Item 054) backward. 4. Linkage Alignment: Locate internal spring-loaded polymer switch actuator bar (Switch Lever C, Item 053) and push forward into ON position. 5. Old Knob Removal: Push old switch knob backward against spring load to snap catch-hook clear of lever notch, then lift vertically. 6. New Component Seating: Insert down-facing hook of new 419566-3 Switch Knob straight down through housing slot and snap into linkage notch. 7. Kinematic Testing: Verify manual slide forward to lock and rear edge press to quick-release. 8. Final Assembly: Re-install rear cover shell and tighten 4x18 tapping screw.
Applications
Structural Steel Fabrication: Utilized on angle grinders within heavy manufacturing facilities for weld bead blending, beveling, slag removal, and surface conditioning.
Masonry & Brick Construction: Installed on tools utilized for cutting stone, scoring bricks, and routing mortar channels in high-dust environments.
Industrial Marine & Shipbuilding: Deployed in high-corrosion, intensive paint and rust stripping tasks using wire wheels or thick abrasive discs.
Power Tool Maintenance and Repair: Used as an OEM replacement part to restore switch functionality on compatible Makita corded and cordless power tools.
