Carbide Tipped Brad Point Bits For Blind Holes Woodworking Boring Bits Drill Bits

Need blind dowel holes that come out clean and start on the mark? The CRN-BH70 is a carbide tipped brad point bit for blind holes: 5–15 mm in eleven diameters, 57 mm or 70 mm overall, one 10 mm round shank, left hand in orange and right hand in black. A four-slot chip removal design clears waste as the point pilots the cut, so the inner hole stays round and the panel face stays intact. One bit per individual package, export carton outside, custom diameters from 50 pcs.

A shop boring dowel seats meets three problems: a hole wall that comes out out-of-round, a rim that tears on a faced panel, and a spindle loaded with the wrong hand. Each one turns a machined part into rework. The CRN-BH70 crown dowel bit removes all three at the point where they start.

It is a crown blind hole bit with a tungsten carbide tip. The special cutting edge shears the surface instead of lifting it, so there is no breakout around the hole, and the four-slot chip removal design carries waste out of a stopped hole. The point pilots before the edges engage.

The range runs 5 mm to 15 mm in eleven diameters: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15 mm. Diameters 5, 6, 7, 8, 10 and 12 mm come in both 57 mm and 70 mm length; 9, 11, 13, 14 and 15 mm come in 70 mm. Every one uses the same 10 mm round shank.

Rotation is a part number difference, not a label: left hand is orange, right hand is black, so a mixed rack cannot go in backwards. Use is on drilling machines and CNC machining centres. Each bit ships in its own package inside an export carton sized to the order; custom diameters from 50 pcs.

A blind hole drill bit either holds the wall of the hole or it does not. These are the parts that decide it:

• Tungsten carbide tip — carbide on the cutting edge, so the edge lasts hole after hole.
• Special cutting edge — grinding follows the rim, so the surface is sheared with no breakout on the panel face.
• Four-slot chip removal — four slots lift waste out of a stopped hole as the bit advances, so drilling stays smooth.
• Point that pilots first — the brad point enters before the cutting edges, so the hole starts on the mark and the wall stays round.
• One 10 mm shank — every diameter from 5 mm to 15 mm shares the 10 mm round shank, so a size change is a bit swap.
• Two lengths — 57 mm and 70 mm overall, for a boring head with a pressure foot close to the panel and one with more clearance.
• Rotation colour code — left hand orange, right hand black: the colour is the rotation check before the bit enters the chuck.
• Wear resistance — carbide at the working edge keeps the profile stable through a batch, so no mid-order resharpening.
• Custom OEM from 50 pcs — non-standard diameters are made to your artwork from 50 pcs, so a machine-specific profile stays a stock line.

The choice is between a low-cost bit replaced mid-batch and an outside sharpening bill per piece. A carbide crown bit sits between the two:

• Dowel joints that assemble as drilled. A round, on-size inner hole from the 5–15 mm range means the dowel seats without reaming — one operation per hole.
• Rims that survive inspection. The cutting edge shears the surface with no breakout, so faced board comes off the table clean, not sorted into reject.
• Rotation you can see. Orange for left hand, black for right hand: a mixed rack cannot be loaded backwards, and that mistake costs a panel.
• One collet for the whole set. Eleven diameters from 5 mm to 15 mm all sit on the 10 mm shank, so changing size is a bit swap.
• A length for the head you have. 57 mm and 70 mm cover a tight boring head and a spindle with more clearance on the same machine floor.
• Chips out, not packed in. The four-slot design moves waste out of a stopped hole as the bit advances, so a deep seat needs no peck cycle.
• Special sizes without a container. Custom diameters start at 50 pcs from your artwork, so a machine-specific profile is a stock line.
• The edge that arrives is the edge that was ground. One bit per package inside a sized export carton keeps the tip cushioned.

Blind holes. It bores dowel seats and other stopped holes in wood, where the point has to stop at depth and the hole wall has to stay round. It runs on drilling machines and CNC machining centres.

No breakout at the rim. The special cutting edge shears the surface before the flutes lift it, so coated board and veneer stay clean at the hole edge.

From 5 mm to 15 mm, in eleven diameters: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15 mm. All of them use the same 10 mm round shank.

Take 70 mm where the head needs reach over the panel, and 57 mm where clearance is tight. Diameters 5, 6, 7, 8, 10 and 12 mm are available in both; 9, 11, 13, 14 and 15 mm come in 70 mm only.

Order by the direction your spindle drives. Left hand bits are orange, right hand bits are black, and both directions are available across the range, so the colour is the check before the bit goes in the chuck.

Yes. Every diameter from 5 mm to 15 mm uses the 10 mm round shank, so a single collet setting holds the smallest and the largest bit in the set.

One bit per individual package, then a standard export carton sized to the quantity you order, so each carbide tip is cushioned on its own in transit.

Yes, from 50 pcs. Send the artwork with the profile and dimensions you need; the drawing is what keeps a custom bit on spec through the run.