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2-1/2″ Up-Shear Surfacing Bit w/ Replaceable Carbide Insert – Whiteside SBU25-2 (AstraHP Coated)

This Up-Shear spoilboard surfacing bit measures 2-1/2″ wide and comes with 2 carbide inserts that can be used on all four cutting edges. AstraHP Coated 1/2″ Shank 2-1/2″ Large Diameter 3″ Overall length 2 wing body Recommended RPM: 10,000 Made in USA

2-1/2″ Up-Shear Surfacing Bit w/ Replaceable Carbide Insert – Whiteside SBU25-2 - Main image
Whiteside SBU25-2 Spoilboard flattening bit
$319 $436.99 In stock

Category: Flattening, Surfacing, & Planing CNC Router Bits

Improve your CNC cutting abilities with the Whiteside Up-Shear CNC Spoilboard Surfacing Router Bit. This 1/2″ shank bit clears the surface of your spoilboard, creating a base surface that is perpendicular to the router motor. It also excels at slab flattening as shown in the video below. This tool measures 2-1/2″ wide and comes with 2 carbide inserts installed.

Recommended RPM: 10,000-12,000 (max 12,000)

Watch @jaybates86 from Jay’s Custom Creations take the SB25-2 for a spin on Osage Orange on his Avid CNC!

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Customer Reviews (4.8 / 5 · 5 reviews)

Kevin T. ★★★★★

The replaceable carbide insert is the reason I picked this over cheaper solid bits, and it paid off immediately—swapped it out in under a minute after a nick. Surfaced a full sheet of MDF spoilboard with zero tear-out and the AstraHP coating kept the pitch from sticking. Cleanest flattening pass I'v

Emma ★★★★★

Spent the weekend flattening a bowed oak panel for a tabletop and this bit left a glass-smooth surface with zero tear-out. The 1/2" shank ran true in my router table and the replaceable insert means I won't be tossing the whole thing when it dulls.

John ★★★★★

The AstraHP coating really makes a difference—chips flew off clean and the cut stayed crisp across a full spoilboard pass. The 1/2″ shank held steady in my spindle, and swapping the insert took under two minutes.

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