Flat Bottom Counterbores with Slow Spiral, HSS M2 Fully Ground Drill Bits

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Counterbore D In.Counterbore D mmCountersink Dia.Drill Bit Dia. InchReplacement DrillShank In.Shank mmWood Screw SizeBrandTool NoOur PriceWish ListReady To Buy
0.39410.0mm5/324.0mm630-2025/16"8.0mm6-8
Timberline 630-200 Flat Bottom Carbide Tipped Counterbore 10mm D x 5/32 Drill D x 5/16 SHK for Wood Screw Size #6-8More infoTimberline630-200$34.15$23.91
Qty:
0.39410.0mm11/644.4mm630-3025/16"8.0mm8-9
Timberline 630-300 Flat Bottom Carbide Tipped Counterbore 10mm D x 11/64 Drill D x 5/16 SHK for Wood Screw Size #8-9More infoTimberline630-300$37.20$26.04
Qty:
3/89.5mm1/83.2mm630-1025/16"8.0mm4-6
Timberline 630-100 Flat Bottom Carbide Tipped Counterbore 3/8 D x 1/8 Drill D x 5/16 SHK for Wood Screw Size #4 - 6More infoTimberline630-100$35.45$24.82
Qty:
1/212.7mm3/164.8mm630-4023/8"9.5mm10
Timberline 630-400 Flat Bottom Carbide Tipped Counterbore 1/2 Dx 3/16 Drill D x 3/8 SHK for Wood Screw Size #10More infoTimberline630-400$37.20$26.04
Qty:
1/212.7mm7/325.6mm630-5023/8"9.5mm12
Timberline 630-500 Flat Bottom Carbide Tipped Counterbore 1/2 D x 7/32 Drill D x 3/8 SHK for Wood Screw Size #12More infoTimberline630-500$38.05$26.64
Qty:
1/212.7mm15/646.0mm630-6023/8"9.5mm14
Timberline 630-600 Flat Bottom Carbide Tipped Counterbore 1/2 D x 15/64 Drill D x 3/8 SHK for Wood Screw Size #14More infoTimberline630-600$38.05$26.64
Qty:
1/212.7mm1/46.3mm630-7023/8"9.5mm16
Timberline 630-700 Flat Bottom Carbide Tipped Counterbore 1/2 D x 1/4 Drill D x 3/8 SHK for Wood Screw Size #16More infoTimberline630-700$38.25$26.78
Qty:
Flat Bottom Counterbores with Slow Spiral, High-Speed Steel (HSS) M2 Fully Ground Drill Bits. For use in handheld drill, drill press & CNC machine when used with CNC Spring Collet*.

CNC Countersink

CNC Countersink Bits

Drilling countersinks with these bits on the CNC machine is a great way to save time and have your pieces look great every time!

With the adjustable depth drill bit you can adjust them for whatever size material you’re working with. They are best used with a drilling toolpath, utilizing the peck drill option at 0.25” per pass with a 0.125” retract height.

For best results run at 3,000 RPM with a 30 Inches Per Minute (IPM) plunge rate. No feed rate needs to be set with these as they only move up and down with the Z axis, not side to side. If your software doesn’t allow a 0 feed rate, you can enter 1 IPM in the feed rate as a placeholder.

*For 5/16" dia. round shank use a 7-8mm Spring Collet. For 3/8" dia. round shank use 9-10mm Spring Collet.


WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.
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