Studio view of the 4 inch bi-metal segmented saw blade displaying the Starlock interface and Bosch branding.
Infographic diagram showing the blade dimensions of 4 inches wide by 3 inches tall and highlighting the segmented bi-metal cutting edge.
Close-up action shot of the blade attached to a multi-tool performing a flush cut on a wooden door jamb.
Action shot of the blade cutting a rectangular opening in laminate flooring for a vent installation.
Front view of the retail blister packaging for the Bosch Starlock blade series displaying compatibility and durability features.
Graphic titled Change Blades in 3 Seconds showing a blue multi-tool head engaging with a Starlock blade.Graphic titled Change Blades in 3 Seconds showing a blue multi-tool head engaging with a Starlock blade.
Graphic illustrating the quick-change mechanism of the Starlock interface with a blade ready to be snapped into place.
Infographic titled How to Change Starlock Blades demonstrating the two-step lever pull and snap-in process.
Graphic titled Fits Multiple Brands listing compatible manufacturers such as Fein, Milwaukee, Makita, and Ridgid connected to the Starlock interface diagram.
Bosch GOP18V-28 Product Video promotion
Studio view of the 4 inch bi-metal segmented saw blade displaying the Starlock interface and Bosch branding.
Infographic diagram showing the blade dimensions of 4 inches wide by 3 inches tall and highlighting the segmented bi-metal cutting edge.
Close-up action shot of the blade attached to a multi-tool performing a flush cut on a wooden door jamb.
Action shot of the blade cutting a rectangular opening in laminate flooring for a vent installation.
Front view of the retail blister packaging for the Bosch Starlock blade series displaying compatibility and durability features.
Graphic titled Change Blades in 3 Seconds showing a blue multi-tool head engaging with a Starlock blade.Graphic titled Change Blades in 3 Seconds showing a blue multi-tool head engaging with a Starlock blade.
Graphic illustrating the quick-change mechanism of the Starlock interface with a blade ready to be snapped into place.
Infographic titled How to Change Starlock Blades demonstrating the two-step lever pull and snap-in process.
Graphic titled Fits Multiple Brands listing compatible manufacturers such as Fein, Milwaukee, Makita, and Ridgid connected to the Starlock interface diagram.
Bosch GOP18V-28 Product Video promotion
BOSCH

Bosch Oscillating Multi Tool Blade OSL400F 4 Inch Starlock Bi Metal Segmented Flush Cut Saw Accessory Fits Wood Nails PVC Sheetrock Plaster

In stock
SKU: OSL400F
$20.97 USD

Description

Bosch Promtional Logo Logout

High-Torque Segmented Oscillating Blade for Flush Cutting Wood and Metal Assemblies

The Bosch OSL400F Starlock 4-Inch Bi-Metal Segmented Oscillating Multi-Tool Blade delivers structural flush cuts and straight linear paths through dense hardwood, PVC, and wood embedded with fasteners. Featuring the premium three-dimensional Starlock interface, this accessory ensures absolute power transmission and reduced operational vibration by forming a tight mechanical bond with the driver. The bi-metal tooth geometry maintains structural integrity under rapid oscillation, avoiding thermal wear when making plunge or perimeter cuts against subfloors, walls, and baseboards. This Swiss-made blade is backward compatible with standard Oscillating Interface System (OIS) configurations for versatile application.

Best Used For:

  • Door Jamb Undercutting: Executing flat flush cuts at the base of interior door frames during new flooring installations.
  • Demolition and Remodeling: Slicing through structural wall baseboards, flooring boards, and concealed framing nails seamlessly.
  • Plumbing Utility Routing: Making straight linear adaptations in PVC drain pipes and plastic electrical conduits inside tight wall cavities.

Key Performance & Safety Features

  • Starlock Interface Connection: Three-dimensional rigid anchor profile yields maximum torque transfer and protects mechanical hardware from slipping.
  • Bi-Metal Blade Configuration: Hardened teeth engineered specifically to maintain a sharp edge while penetrating nail-embedded timber materials.
  • Flat Segmented Geometry: Circular outer arc allows continuous straight cutting lines while the flat side permits precision flush trims.
  • Universal System Fitment: Integrates directly into next-generation Starlock power tools and remains fully backward compatible with legacy OIS machinery.
  • Swiss-Made Manufacturing: Precision manufacturing standards guarantee extended blade longevity and low vibration under deep loading conditions.

What's Included

  • (1) 4 In. Starlock® Bi-Metal Segmented Saw Blade

Technical Specifications

Brand Bosch
Model Number OSL400F
Sub Brand Starlock
Blade Diameter 4 in.
Blade Material Bi-Metal (BIM)
Blade Type Segmented Flush Cut
Primary Application Wood, Hardwood, Wood w/ Nails, PVC
Interface Type Starlock (OIS Compatible)
Country of Origin Switzerland
Package Quantity 1

Pro-Tip: When undertaking long linear flush cuts, allow the multi-tool to oscillate at its maximum speed while applying very light forward pressure. Moving the blade slightly back and forth along the cut path helps clear fine debris from the bi-metal teeth, keeping thermal buildup to a minimum.