49-001 Onsrud 1/4" HSS Downcut Router 2 Flute .250" Diameter .5625" Flute 2.75" Length .250" Shank

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LMT Onsrud 49-000 Series: High-Speed Steel (HSS) Aircraft Downcut Spiral Router Bits

The Industry Standard for Precision Hand-Held & CNC Trimming

Originally engineered to meet rigorous aerospace manufacturing specifications as "Aircraft Throwaway" tools, the LMT Onsrud 49-000 Series has become a trusted industry staple for fast, high-efficiency trimming and routing.

Constructed from premium-grade High-Speed Steel (HSS), these uncoated, bright-finish bits deliver maximum toughness, exceptional resistance to shock loads, and a fine-grain edge structure that maintains razor-sharp performance under demanding production conditions.

Advanced Geometry for Clean, Splinter-Free Finishes

The 49-000 Series combines two distinct design elements to maximize edge finish quality and tool versatility:

-  Double-Flute Downcut Spiral: Pushes chips downward and into the cut, forcing the material firmly against the machine bed or fixture. This actions completely eliminates top-surface lifting, tearing, and chip-out on sensitive laminates, veneers, and thin materials.

-  Specialized Drill-Type Point: Unlike standard square end mill configurations, the integrated drill point allows for immediate, low-resistance plunge entries, making this series highly adaptable for pocketing, blind routing, and complex profile trimming.

Versatile Application Across Materials

While engineered for aerospace-grade trimming, the structural rigidity and balance of the 49-000 Series make it exceptionally versatile across a broad spectrum of commercial fabrication materials:

-  Laminates, Melamine, & Veneers: Eliminates micro-chipping on delicate surface layers.

-  Pre-Finished Plywoods & Wood Composites: Ensures crisp, seamless top edges.

-  Non-Ferrous Metals & Thin Aluminum: Provides excellent stability and clean cuts in sheet and profile routing.

-  Plastics & Advanced Composites: Prevents material lifting or melting during high-speed manual operations.

Optimized for Hand Routers & CNC Machining Centers

Thanks to their dual-flute geometry, 49-000 Series router bits offer superior dynamic balance at high RPMs. This drastically reduces tool vibration, making them the premier choice for hand-held manual routing operations where operator control and smooth finishes are critical. They are equally productive when running production tool paths on lightweight industrial CNC routers.