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3/8″ Up-Cut Flush Trim Router Bit – 1/2″ Shank – AstraHP Coated – Bits&Bits (540-SRF375FT)
46 reviews
$119.99
Stronger than a 1/4″, tighter than a 1/2″—this solid carbide 3/8″ up-cut flush trim router bit hits the routing sweet spot. With a 3/8″ cutting diameter for tighter curves and a 1/2″ shank for pro-level stability, it’s perfect for template work, sign making, and detail trimming. The up-cut spiral design clears chips fast and leaves crisp edges—ideal for router table use, but just as capable handheld.
Recommended RPM: 16,000
In stock
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The Sweet Spot Between Strength and Precision
Designed for projects where 1/2″ bits are too bulky and 1/4″ bits fall short, this 3/8″ up-cut flush trim router bit delivers unmatched versatility. Built from solid carbide, it offers superior strength, heat resistance, and edge retention—ideal for repeated use in dense hardwoods, plywood, and composite panels.
The 1/2″ shank minimizes deflection and vibration, while the 3/8″ cutting diameter allows for tight-radius template routing without compromising on control or cut quality. A 1-1/2″ cutting length gives you plenty of reach, and the up-cut spiral geometry ensures fast chip removal and a clean finish on the bottom edge.
Whether mounted in a router table or guided by hand, this bit brings a rare combination of agility, power, and long-term durability to your workflow.
Specifications:
- Material: Solid Carbide
- Cut Diameter: 3/8″
- Shank Size: 1/2″
- Cut Length: 1-1/2″
- Flute Type: Up-Cut Spiral
- Recommended RPM: 16,000
- Applications: Sign routing, pattern work, laminate trimming, curved templates
- Router Compatibility: Table-mounted and handheld routers
Why It’s a Shop Essential:
- Navigate tight curves without compromising strength
- Smoother, stronger alternative to 1/4″ bits
- Ideal for high-precision template work
- Built to last under demanding use with solid carbide durability
| Weight | 0.345 lbs |
|---|---|
| Shank | 1/2" |
| Cut Diameter | 3/8" (.375") |
| Cut Length | 1-1/2" |
| Cut Style | Up-Cut |
New, unused in-stock tools may be returned within 30 days of delivery for a full refund. Made-to-order tools such as engraving cutters with custom tip sizes are subject to a 20% restock fee if returned. The buyer is responsible for return shipping costs unless the return is the result of our error (i.e. you received an incorrect or defective item). Beyond 30 days, we reserve the right to offer refunds or store credit at our discretion, with the exception of warranty related requests. You can also exchange any unused item for one of our other tools. You will be responsible for shipping charges on any exchanges unless in error on our part.
If your order arrives damaged in any way, please email us as soon as possible at info@bitsbits.com with your order number and a photo of the condition.
For more information, see our Returns and Refunds page.
For more information see our returns and refunds page..
Defective Items
We are committed to ensuring all of our products are of high quality and will replace or refund items that we determine to be defective. In the event you believe you have a defective tool, please call us or email us at info@bitsbits.com. Include your order number and as much info as you can about your setup, i.e., CNC, router, speeds and feeds, material you’re cutting, etc. In most cases of what seemed to be a defective tool, we have been able to help a customer with proper settings or techniques for efficient use. A
Anonymous The bit cut super smooth edges on 3 pieces of 1/2 inch maple plywood that I was duplicating a pattern from a template on the top of the stack. I was very pleased with the results but the bit was pretty pricey. If you're a pro woodworker then it's worth the cost.
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Bogdan Racu The best bit I have ever owned.
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Monty Daniel It's so pretty I was to afraid use it. Super smooth and alot quieter. 👍👍👍
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Chris Murphy Good bit. Mounted in my Bosch 1617. Much cleaner cuts than what I'm used to.
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