Woodworking Machine Tool D5-15mm Tungsten Carbide Through Hole Drill Bit

Need a through hole that stays round in hardwood and softwood without stopping the drilling machine? This is a through hole drilling head with a carbide blade, supplied from D5 mm to D15 mm on one 10 mm shank and a 70 mm body. Rotation comes right or left, so the bit follows the spindle you already turn. The body is red / black. It is a woodworking machine tool — a spare that drops into the head already bolted to the machine.

Drilling through-holes in wood turns up the same three problems in most shops: the bit walks on the entry face in hardwood, chips stay in the hole and heat the wall in softwood, and the bit bought for one head will not go into the next. This through hole drilling head is built around those three.

It is a tungsten carbide through hole drill bit for woodworking machine tools, sized from D5 mm to D15 mm in one series, so a single part family covers the common dowel and joinery holes. Body length is 70 mm and the shank is 10 mm at every diameter in the range — the head is set once and only the cutting diameter changes.

Rotation is supplied both ways, right and left, and the body is red / black. The carbide blade is the part that meets the wood: that edge has to hold its form in hardwood and softwood on a cutting machine running at production speed, while the 10 mm shank carries the load back into the chuck.

Chip removal is designed into the head, so debris leaves the hole instead of being re-cut at the bottom and heating the wall. Easy installation matters for the same reason: a spare that changes in minutes keeps a boring head producing, where a bit that needs a fixture change stands the machine down.

What makes this bit different on a boring head, in numbers:

• Carbide blade. The cutting edge is tungsten carbide on a steel body, so the part meeting abrasive hardwood wears as a blade, not as a 10 mm shank.
• D5 mm to D15 mm in one series. The whole range shares one 10 mm shank and one 70 mm body, so the head is set once and only the hole diameter changes.
• 70 mm body. 70 mm reaches through standard panel builds without an extension between chuck and cut.
• Right and left rotation. Both directions are supplied, so a spindle turning the other way gets the matching bit.
• Through hole geometry. The head cuts right through the board, so the hole is open on both faces and no second operation opens the back.
• Chip removal built in. Debris leaves the hole as the bit turns instead of being re-cut at the bottom, which heats the wall.
• Heat kept off the edge. Because chips clear, friction heat stays off the carbide, and a cool edge holds its form longer in softwood.
• Red and black body. Two-colour bodies make a wrong diameter obvious on the tool board before the bit goes into the chuck.
• Easy to install. It goes into the head with the same chuck as the previous bit: no adapter, no fixture change.

A shop drilling through-holes has two options: a low-cost bit that gives up in hardwood, or a special order that will not fit the head already bolted to the machine. This bit closes that gap.

• One shank, every head on the floor. The 10 mm shank is identical across D5 mm to D15 mm: no adapter to buy, no re-setup when the bit moves head.
• One series instead of five part numbers. 5 mm to 15 mm from one series keeps the spares shelf small and still covers the common dowel and joinery holes.
• Rotation is chosen, not adapted. Both L and R are supplied, so a spindle turning the other way needs no modified bit or reversed head.
• The carbide is the wear part. Tungsten carbide meets the wood directly, so cost lands on a replacement blade instead of on reworked panels.
• Chips leave, the wall stays cool. Debris out of the hole means less rubbing at the bottom, where a through hole starts to burn in softwood.
• Change it in minutes. Nothing to modify, nothing to align: the bit goes into the 10 mm chuck, so a spare does not stop the head for a shift.
• Size is visible at arm's length. Red and black bodies mean a wrong diameter is spotted on the board before it is chucked and scrapped through a panel.

Yes, if the head takes a 10 mm shank. That single number decides the fit: the shank is 10 mm on every diameter from D5 mm to D15 mm, and rotation is supplied right or left, so the machine make does not have to change.

Order by the hole you drill, not by the machine. The series runs D5 mm to D15 mm and every size sits on the same 10 mm shank and 70 mm body, so several diameters can share one head without a re-setup.

It cuts right through the board, so the hole is open on both faces. That is the difference from a blind bit: nothing is left to open at the back, and the head is ground for a clean exit as well as a clean entry.

Match the direction your spindle turns. Both L and R are supplied; running the wrong one turns the edge backwards, which scorches the hole wall and takes the carbide off in a single panel.

Yes in hardwood and in any abrasive board. The carbide is what holds the edge while a cutting machine runs at production speed, so the cost per hole lands on a blade instead of on a re-cut panel.

A sharp carbide edge enters cleanly; splintering on the face comes from a dull edge, not from the bit type. With chips clearing the hole, the edge stays cooler and stays sharp longer, which is what keeps the entry face whole.

70 mm of body on a 10 mm shank. That is enough for standard panel builds without an extension between the chuck and the cut, and the shank length is the same at every diameter in the series.

Three numbers: the diameter (D5 mm to D15 mm), the rotation direction (L or R) and the shank you run (10 mm). Add the wood you drill and how many heads you operate, and the quote comes back against the right bit the first time.