Premium CNC & Router Bits for Precision Cutting

82° Countersink Bit for CNC – Bits&Bits (425-CS582)

Get perfect countersinks every time! Solid carbide 82° countersink bit with 3 flutes, 1/2″ cut diameter, 1/4″ shank. Designed for most screw heads to sit flush. Made in the USA for precision and durability. Solid Carbide Shank: 1/4″ Diameter: 1/2″ 3 Flute 82° matches common screw heads Length of Cut: 0.40″ Overall Length: 2-1/2 inches Made in USA #row-47224333 > .col > .col-inner { padding: 20px 0px 20px 0px; } #section_1963073800 { padding-top: 45px; padding-bottom: 45px; } @media (min-width:550px) { #section_1963073800 { padding-top: 65px; padding-bottom: 65px; } } @media (min-width:850px) { #section_1963073800 { padding-top: 2px; padding-bottom: 2px; } }

82° Countersink Bit for CNC – Bits&Bits (425-CS582) - Main image
$36.03 $52.99 In stock

Category: V-Groove Router Bits

Achieve precise, professional countersinks every time with the Bits & Bits 82° countersink bit. Crafted from solid carbide and featuring three sharp flutes, this bit provides smooth, accurate cuts with minimal tear-out. The 1/2″ cut diameter and 82° angle are ideal for most common screw heads, allowing them to sit snugly and fully contact the sides of the countersink hole. With a 1/4″ shank, this countersink bit is compatible with most CNC machines and is built to last, offering long-lasting performance and reliability. Proudly made in the USA, it delivers the quality and precision you expect from Bits & Bits.

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 (4.6 / 5 · 5 reviews)

Sofia E. ★★★★★

The three flutes on this 82° bit cut so smoothly that my countersinks came out glass-like on the first try. I've had issues with chatter on other bits, but this one just glides right through.

Leo U. ★★★★★

Using this bit in my CNC for the first time, the three flutes cut buttery smooth through walnut without any chattering. It leaves a perfectly clean countersink that makes screw heads sit flush every time.

John ★★★★★

The three flutes make a world of difference—cuts are noticeably smoother than my old two-flute bit, and the 82° angle seats screws perfectly flush without any chatter. Solid carbide has held up through a dozen hardwood jobs so far.