Carbide Tipped Brad Point Boring Bit 70mm L TCT For Blind Hole Drill Bit

Need dowel and hinge holes that come out clean and start where the mark is? This carbide tipped brad point bit does both: tungsten carbide tip, 70 mm body, 10 mm shank, 2 mm to 8 mm in ten steps, left hand in orange and right hand in black. The point pilots the hole before the flutes cut, so the rim shears instead of tearing. One bit per plastic tube, export carton outside, custom diameters from 50 pcs.

A shop boring dowel and hinge holes meets the same three problems: a rim that tears out on coated board, holes that walk off the marked centre once the point skates, and an edge that is blunt before the batch ends. The TCT blind hole drill bit is built for all three. The brad point pilots the cut before the flutes engage, the cutting edges shear the rim instead of lifting it, and the tip doing the cutting is tungsten carbide.

It is a 70 mm TCT boring bit with a 10 mm shank, made for stopped holes and dowel joints. The size chart runs 2 mm to 8 mm in ten steps — 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 and 8 mm — and every diameter shares the same 10 mm shank, so one collet size covers the whole drawer. A 57 mm body is an alternative length.

Rotation is a part number difference, not a label. Left hand bits are orange, right hand bits are black, so a mixed set on a multi-spindle head cannot go in backwards, and both directions cover the whole range.

Each bit ships in its own plastic tube, then an export carton sized to the order. Non-standard diameters are made to buyer artwork from 50 pcs, so a machine-specific profile stays a stock item, not a project.

What separates a boring bit from a general drill is the point and the cutting material:

• Tungsten carbide tip — the cutting edge is TCT on a steel body, so the working geometry is carbide, hole after hole.
• Brad point pilot — the point engages the wood before the flutes, so the hole starts on the mark.
• Rim that shears, not tears — sharpened cutting edges cut the surface at the rim, which keeps coated board clean at the hole edge.
• 70 mm overall length — clears a pressure foot and hold-down on a boring head; a 57 mm body suits tighter heads.
• One 10 mm shank — every diameter from 2 mm to 8 mm shares the 10 mm shank, so sizes swap without a collet change.
• Left or right hand, colour coded — left hand orange, right hand black: the colour is the rotation check before the bit enters the chuck.
• Engineered flutes — the flute form lifts chips out of a stopped hole instead of packing them at the bottom.
• Blind hole duty — made for dowel seats, hinge cups and shelf pin holes, where the point stops at depth without breaking the face.
• Custom sizes from 50 pcs — non-standard dimensions are made to buyer artwork from 50 pcs, without a full container behind them.

The usual choice is between a cheap bit replaced every few thousand holes and a tooling account billed per piece. A carbide tipped boring bit sits between the two, and the numbers are on the bit itself:

• Holes that need no second pass. A sheared rim means a dowel seat that assembles without reaming or filling — one operation per hole, at whatever rate the head runs.
• One collet for the whole drawer. Every diameter from 2 mm to 8 mm shares the 10 mm shank, so changing a size is a bit swap instead of a collet change and a re-set.
• Rotation you can see. Orange for left hand, black for right hand: a mixed rack cannot be loaded backwards, which is the mistake that costs a panel, not a bit.
• Depth control at the point. The brad point gives the operator a fixed reference, so a blind hole stops where the dowel needs it and the face stays intact.
• Special sizes without a container. Custom diameters start at 50 pcs from your artwork, so a machine-specific profile is a stock line rather than a one-off project.
• Kept sharp in transit. One bit per plastic tube inside a sized export carton: the edge that arrives is the edge that was ground, so the first hole runs like the last.

Blind holes. It is a brad point boring bit for dowel joints, hinge seats and shelf pin holes in wood, where the point has to stop at depth without breaking the panel face.

Not at the rim. The cutting edges are ground to shear the surface before the flutes lift it, which is what keeps coated board and veneer clean at the hole edge.

70 mm overall. A 57 mm body is also available for boring heads with less clearance; both lengths use the same 10 mm shank.

2 mm to 8 mm, in ten steps: 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 and 8 mm. Non-standard diameters can be made to your artwork from 50 pcs.

Order by the direction your boring head drives. Left hand bits are orange, right hand bits are black, and both directions are available across the diameter range.

Yes. Every diameter from 2 mm to 8 mm uses a 10 mm shank, so a single collet setting holds the smallest and the largest bit in the set.

One bit per plastic tube, then an export carton sized to the quantity you order. Each bit is cushioned on its own, so edges do not chip against each other 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.