Premium CNC & Router Bits for Precision Cutting

2-1/2″ Up-Shear Surfacing Bit Kit – Whiteside SBU25-2KIT (AstraHP Coated)

This Up-Shear 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″ Up-Shear Surfacing Bit Kit – Whiteside SBU25-2KIT (AstraHP Coated) - Main image
Whiteside SBU25-2 Spoilboard flattening bitWhiteside SBU25-2 Spoilboard flattening bitT-15 torx wrench for flattening bitAstraHP Coated Inserts
$359.99 $499.99 In stock

Category: Flattening, Surfacing, & Planing CNC Router Bits

NOTE: If you’re flattening epoxy tables or slabs, we have found that the up-shear bit can cause pitting in the epoxy; we recommend the Whiteside SB25-2 surfacing bit. 

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!

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (5.0 / 5 · 5 reviews)

Emily U. ★★★★★

Cutting through some gnarly white oak for a tabletop, and this bit chewed through it with zero burning or chattering. The Astra coating really helps keep it clean, and the finish after surfacing was nearly ready for sanding.

Daniel ★★★★★

I was worried about tear-out on maple, but the up-shear geometry left an almost glassy surface on my test pass. The AstraHP coating is holding up well after a solid afternoon of flattening walnut slabs.

Miles B. ★★★★★

The AstraHP coating on this bit is a game-changer—chip evacuation stayed clean even on a dense hardwood flattening pass, and the finish came out smooth enough to skip sanding. I’ve used cheaper up-shear bits that gummed up mid-job, but this one held its edge the entire session.

Related Products