Crown Through Hole Drill Bit CNC Tools Boring Bit For Woodworking Machine

Need one boring bit that cuts a clean through hole in plywood, hardwood, particleboard and MDF without blowing out the face? The CRN-TH70 does it with a tungsten steel twist body, a 10 mm round shank, 70 mm overall length and diameters from 5 mm to 12 mm. It is made in left-hand (orange) and right-hand (black) rotation, both hands in all seven sizes, packed one piece per plastic tube, and can be produced to your own dimensions or length from 50 pcs with supplied artwork.

A shop boring through holes all day runs into the same three things: a bit that splinters the panel where it breaks out, a shank that does not match the boring head so every diameter needs its own setting, and a size range that stops right where the job starts. The CRN-TH70 is built against all three.

It is a crown through-hole twist drill bit in tungsten steel, 70 mm overall, on a 10 mm round shank. Diameters run 5, 6, 7, 8, 9, 10 and 12 mm; the 8 mm is the headline size of this listing, and every one of the seven keeps the same 70 mm length and the same 10 mm shank.

Rotation direction is colour coded. Left-hand bits are orange, right-hand bits are black, and both hands are made in all seven diameters, so a dual-spindle boring head is fitted without reading a stamp on the shank.

The body is tungsten steel alloy with sharpened cutting edges and engineered flutes, aimed at plywood, hardwood, particleboard and MDF. Bits ship one piece per plastic tube inside a standard carton, and other dimensions are produced from 50 pcs against your artwork.

Specification first — a boring bit is bought on shank, length and diameter:

• Tungsten steel body — the cutting material is tungsten steel alloy, so the edge is not plain steel.
• 70 mm overall length — one length from 5 mm to 12 mm, so the bit reaches the same depth in every diameter.
• 10 mm round shank — a single shank size across seven diameters, so the collet or chuck is set once.
• 5–12 mm in seven steps — 5, 6, 7, 8, 9, 10 and 12 mm, all at 70 mm length on that same 10 mm shank.
• Left and right hand — left-hand rotation in orange, right-hand in black, both hands made in all seven sizes.
• Colour-coded shank — direction is read from the colour, so a bit returns to the right spindle first time.
• Sharpened cutting edges — the edge geometry stops the face splintering as the bit breaks out.
• Engineered flutes — the flute form is set for smooth chip removal, so the hole does not pack up mid-cut.
• Concentric blade handle — the shank is turned concentric, so rotation stays balanced at speed.
• One piece per plastic tube — each bit is packed singly, then into a carton sized to the quantity ordered.
• Custom sizes from 50 pcs — other dimensions are produced against supplied artwork, checked before the run.

Buying a boring bit usually comes down to two bad options: an outsourced drilling run, or a bit that only half fits the head. The CRN-TH70 removes the choice:

• One shank, seven diameters. Every size from 5 mm to 12 mm shares the 10 mm round shank, so you keep one bit family instead of seven fittings.
• Depth that stays put. All seven sizes are 70 mm long, so a hole gets wider without getting deeper and the head setup stays put.
• Colour instead of guesswork. Left-hand is orange and right-hand is black, so a bit goes back into the correct spindle on the first attempt.
• Cleaner hole rims. Sharpened cutting edges help prevent splintering, so more panels reach assembly instead of the scrap bin.
• Chips that clear. Engineered flutes keep the hole from packing up halfway, so the bit is not backed out to clear debris.
• Balanced at running speed. The concentric shank holds the centre of rotation true, so a small bit does not walk across the surface on entry.
• An edge that lasts the shift. Tungsten steel alloy with a wear-resistant edge means fewer bit changes per shift than a plain steel body.
• Small MOQ for private label. Custom dimensions start at 50 pcs against your artwork, so a branded run costs a shelf slot instead of a container.

Seven, from 5 mm to 12 mm: 5, 6, 7, 8, 9, 10 and 12 mm. The 8 mm is the headline size of this listing, and every diameter is 70 mm long on the same 10 mm round shank.

Yes, if your machine takes a 10 mm round shank. Because the shank is identical across all seven diameters, one collet or chuck setting holds the 5 mm bit and the 12 mm bit.

By colour. Left-hand rotation is orange and right-hand rotation is black, and both hands are made in all seven diameters, 5 mm through 12 mm.

It is a through-hole bit. It is a crown through-hole twist drill bit for woodworking drilling machines, 70 mm overall, and it is not offered as a blind-hole or countersink bit.

Plywood, hardwood, particleboard and MDF. The tungsten steel alloy body, sharpened cutting edges and engineered flutes are all specified for wood drilling on a drilling machine.

Yes, other dimensions can be produced. Customisation starts at 50 pcs, and you send the artwork first so the bore and the shank are checked before the run.

One piece per plastic tube, then a standard carton box sized to the quantity you order. The tube protects the cutting edges, so a bit issued from stores arrives sharp.

Price is to be negotiated against the diameter, quantity and packing you need, and shipping is to be negotiated per order. Send the sizes and the quantity and we quote against them.