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2-1/2″ Surfacing Bit Kit – Whiteside SB25-2KIT (AstraHP Coated)

Whiteside’s SB25-2 spoilboard surfacing Kit comes with 10pak of inserts, Torx driver and extra Insert Screw. 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″ Surfacing Bit Kit – Whiteside SB25-2KIT (AstraHP Coated) - Main image
T-15 torx wrench for flattening bitAstraHP Coated Inserts
$324.29 $469.99 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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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

Victoria ★★★★★

The AstraHP coating is what sold me — after flattening a full sheet of MDF, the bit still looks nearly new, no pitch buildup at all. The up-shear design leaves a clean surface with zero chatter marks, and the 1/2″ shank gave me zero deflection even at 18,000 rpm.

Ruby ★★★★★

The up-shear geometry cleared chips so cleanly that my spoilboard came out glassy smooth with zero burn marks, even on a fast pass. The AstraHP coating has held up through three flattening jobs so far without any visible wear on the cutting edges.

William ★★★★★

I was worried about tear-out on my MDF spoilboard, but this bit's up-shear design leaves a clean, flat surface every time. The 1/2" shank fits solidly in my router collet, and it handled a full sheet resurfacng in about 15 minutes without any heat buildup.

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