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AstraHP Coated Bits & Bits 425-SRB250 1/4" Ball Nose CNC Router Bit
AstraHP Coated Bits & Bits 425-SRB250 1/4" Ball Nose CNC Router Bit
AstraHP Coated Bits & Bits 425-SRB250 1/4" Ball Nose CNC Router Bit
AstraHP Coated Bits & Bits 425-SRB250 1/4" Ball Nose CNC Router Bit
AstraHP Coated Bits & Bits 425-SRB250 1/4
AstraHP Coated Bits & Bits 425-SRB250 1/4
AstraHP Coated Bits & Bits 425-SRB250 1/4
AstraHP Coated Bits & Bits 425-SRB250 1/4

1/4″ Ball Nose Spiral Bit

$40.99

Grab 4, pay for 3. Same shank, no funny business. 😎

In stock

Used for milling rounded slots, slopes and machining 2D/3D dimensional contours with a smooth finish.

  • AstraHP Coated
  • Solid Carbide
  • Tip diameter: 1/4″ (0.25″)
  • Shank Diameter: 1/4″
  • Length of cut: 1″
  • Overall Length: 2-1/2″
  • Previously SRB4-250UP
  • Made In USA
CNC-HandRouter-RouterTable

In stock

  • Standard Shipping starts at $6.75
  • FREE shipping on orders over $139
  • Eligible for return within 30 days.
    Exclusions apply. See our returns policy.
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SKU: 425-SRB250 Categories: , , Brand:
More Info

Solid Carbide 2 Flute 1/4″ Ball Nose Router Bit.

Used for milling rounded slots, slopes and machining 2D/3D dimensional contours with a smooth finish. Great for milling into all types of material including, wood, plastic, metal etc.

These tools are coated with a proprietary high performance *Astra coating* that allows higher speed & feed rates as well as extended tool life & increased lubricity in abrasive material.

 

What is a Ball Nose End Mill?

Ball nose end mills, also known as full radius end mills or ball mills, are cutting tools where the nose radius is equal to half of the diameter of the tool. This creates a constant single radius (or ball) at the tool end with no straight edge (sharp corners) in the profile. They are used for contour milling, shallow slotting, pocketing and contouring applications. Ball nose mills are ideal for 3D contouring because they are less prone to chipping and leave a nice rounded edge.

Tip: Use a Roughing end mill first to remove large areas of material then proceed with a ball nose end mill.

Similar to Whiteside RU2075RN.

  • Same-Day Shipping: Orders placed by 2:00 PM PST, Monday–Friday, ship the same day.

  • Custom Engraving Tools: Made to order and typically ship within 1–2 business days.

  • Standard U.S. Shipping: Starts at $7 and delivers in 3–10 business days.

  • Express Shipping: $10.99 with 2–3 business day delivery.

  • Next Business Day Shipping: Starts at $35.

  • International Shipping: Available via FedEx only. Rates calculated at checkout.

New, unused in-stock tools may be returned within 30 days of delivery for a full refund.
Made-to-order tools—such as custom engraving cutters—may be returned but are subject to a 25% restocking fee.

Customers are responsible for return shipping costs unless the return is due to our error (such as receiving an incorrect or defective item). After 30 days, refunds or store credit may be offered at our discretion, except for warranty-related issues. Start your return here.

Unused items may also be exchanged for other tools; shipping charges apply unless the exchange is required due to our mistake.

If your order arrives damaged, please email info@bitsbits.com

Speeds & Feeds

This data serves as a general guidance only.
Soft/Hard Woods/ MDF – Spindle Speed- RPM: 16-18K  – Feed Rate – IPM : 180-280″
Plastics / Aluminum – Spindle Speed- RPM: 16-18K  – Feed Rate – IPM : 120-200″
Max Cut depth per pass 1/4″