70mm Length TCT Through Hole Drill Bit for Woodworking Drilling Machine

Need one bit family that covers every through hole from 2 mm to 8 mm on a single 10 mm shank? The TCT-TH70 does it: TCT (tungsten carbide) cutting head, 70 mm overall length, ten diameters from 2 mm to 8 mm, left-hand in orange and right-hand in black, so direction is read from the colour without a stamp. Bits are packed one per pack inside an export carton, fit woodworking drilling machines and CNC machining centres, and can be customised from 50 pcs. Price on request.

A shop that drills through holes every day hits the same three things: a bit that splinters the face on entry, a length that fights the boring head, and a size range that stops at 5 mm when the job calls for 2 mm or 8 mm. The TCT-TH70 is the bit that covers the whole range on one 10 mm shank.

It is a TCT (tungsten carbide) through-hole bit, 70 mm overall, with a 10 mm round shank. Diameters run from 2 mm to 8 mm in ten steps: 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 and 8 mm. Every diameter is 70 mm long, so hole depth does not change when the hole size does, and every diameter shares the same 10 mm shank.

Rotation direction is colour coded: left-hand bits are orange, right-hand bits are black, and both directions are available in all ten diameters. That matters on CNC machining centres and multi-spindle drilling heads where neighbouring spindles turn in opposite directions and a swapped bit means a scrapped part.

Flutes are engineered for chip removal and the cutting edges are sharpened to help prevent splintering, so the bit enters and exits without tearing the surface around the hole. Each bit ships in its own pack, the outer carton follows the ordered quantity, and customisation is supported from 50 pcs against artwork you supply.

Specification first — a bit is bought on dimensions:

• TCT cutting head — the cutting material is TCT / tungsten carbide, so the edge is not a plain high-speed steel edge.
• 70 mm overall length — one length across the whole range, so the bit reaches the same depth at 2 mm as at 8 mm.
• 10 mm round shank — a single shank size for all ten diameters, so the chuck or collet is set once.
• 2–8 mm in ten steps — 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 and 8 mm, all at 70 mm length.
• Left and right rotation — left-hand in orange, right-hand in black, both stocked in every one of the ten sizes.
• Colour-coded shanks — the direction is read from the shank colour, not from a stamp you need a light for.
• Engineered flutes — the flute form is set for reliable chip removal as the bit advances through the part.
• Sharpened cutting edges — the edge geometry is there to help prevent splintering at 2 mm as well as at 8 mm.
• Individually packed — one bit per pack, then a standard export carton sized to the quantity ordered.
• Customisation from 50 pcs — OEM runs are supported against supplied artwork, checked before production.
• Twist drill body — a standard twist pattern that clamps in drilling machines and CNC machining centres.

Buying a through-hole bit usually comes down to a choice between an outsourced drilling run and a bit that half-fits the head. The TCT-TH70 removes that choice:

• One shank, ten sizes. Every diameter from 2 mm to 8 mm shares the 10 mm round shank, so you keep one bit family on the shelf instead of ten different fittings.
• Colour instead of guesswork. Left-hand is orange, right-hand is black, so a bit goes back into the correct spindle on the first attempt.
• Depth that stays put. All ten sizes are 70 mm long, so a hole gets wider without getting deeper and the head setup stays put.
• Cleaner hole rims. Sharpened cutting edges help prevent splintering, so more parts reach assembly instead of the scrap bin at 2 mm and at 8 mm.
• Chip flow you can count on. Engineered flutes clear chips as the bit advances, so the hole does not pack up halfway.
• Small MOQ for private label. Customisation starts at 50 pcs with your artwork, so a branded run costs a shelf slot instead of a container.
• Stores-friendly packing. Bits arrive one per pack inside the export carton, so they can be issued singly without breaking open a bag.
• One part number for two machine types. The same bit is specced for drilling machines and CNC machining centres, so spares planning stays on one line.

Ten diameters, from 2 mm to 8 mm. The steps are 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6 and 8 mm, and every one of them is 70 mm long with a 10 mm round shank.

Yes, if the machine takes a 10 mm round shank. The shank is round and the same on all ten diameters, so a chuck or collet set for 10 mm holds the 2 mm bit and the 8 mm bit alike.

By colour. Left-hand rotation is orange, right-hand rotation is black. Both directions are available in all ten diameters, so a dual-spindle head can be fitted from one order.

The cutting material is TCT / tungsten carbide as specified for this bit. If your drawing calls for a specific construction, confirm it with us before the order so the artwork matches.

No. Every diameter is 70 mm overall. Only the drill diameter changes across the range from 2 mm to 8 mm; length and the 10 mm shank stay fixed.

Yes, customisation is supported from 50 pcs. Send the artwork and we check it against the 70 mm length and 10 mm shank before the run, so the finished bit matches what you drew.

Individually packed, then into a standard export carton sized to your order quantity. Shipment is by air, by sea or by express, chosen to suit the quantity; freight is quoted once the destination is confirmed.

On woodworking drilling machines and CNC machining centres, for through holes in woodworking parts. It is a woodworking machinery tool, listed under woodworking drill bits, and it is not a metalworking bit.