57mm Forstner Boring Bits Four Flute Drill Bit For Woodworking Boring Machine

Need one boring bit that survives a production shift on hinge cups and dowel holes? This is a 57 mm Forstner boring bit with four flutes ground in one CNC pass, a micro grain tungsten steel cutter head, a round 10 mm shank on the 12–28 mm sizes and 12 mm to 80 mm available diameters. Right hand bits are black, left hand bits orange, so opposite spindle heads load correctly. 70 mm overall length is available in the same diameter steps, and custom sizes start at 50 pcs.

A plant that bores hinge cups and dowel holes on a nesting line meets the same three problems: a bit that wanders across the entry face, an edge that dulls after a few hundred panels, and a replacement that arrives in the wrong diameter because nobody checked the shank. This four flute Forstner boring bit is built to remove all three.

It is a 57 mm long Forstner boring bit for woodworking boring machines, with four flutes ground in one pass on a four axis CNC machining center. Cutting diameters run from 12 mm to 80 mm in the size chart, with 15–40 mm listed as the standard range, and the round shank steps from 10 mm at 12 mm up to 25 mm at 80 mm. Black bits turn right hand, orange bits turn left hand.

The cutter head is micro grain tungsten steel, welded to the body at low temperature so the joint is not drawn back in hardness, and a special surface treatment cuts friction at the bore wall. Four flutes carry chips out of the cup instead of burnishing its wall.

Every bit ships individually packed, then into a standard export carton sized to the ordered quantity. Custom diameters and markings are supported from 50 pcs against artwork you supply. A 70 mm overall length is available in the same diameter steps.

A boring bit only survives a production shift when flute geometry, head hardness, chip clearance, shank fit and diameter choice all hold up. Each one is fixed by the specification below.

• Four flutes — All four edges are ground together on a four axis CNC center, so they stay symmetrical over regrinds.
• Tungsten steel head — The cutter is micro grain tungsten steel, chosen for wear resistance, so the edge holds up through long boring runs.
• Low temperature welding — Head and body are joined at low temperature, so heat does not draw hardness from the weld zone.
• Two lengths — 57 mm standard, 70 mm available in the same diameter steps for heads that need more length.
• 12 mm to 80 mm — Diameter chart runs 12 mm to 80 mm, with 15–40 mm as the standard range for hinge cups.
• Shank 10 mm to 25 mm — Round shank: 10 mm on the 12–28 mm sizes, stepping to 25 mm at 80 mm.
• Color coded rotation — Right hand black, left hand orange, so opposite spindle heads load correctly first time.
• Friction treatment — A surface treatment lowers friction where the cup wall rubs timber, cutting heat and resin pickup.
• Individual packing — Each bit is packed on its own, then cartoned for export, so edges arrive un-nicked.

Most shops face two bad options for a worn boring bit: send it out and wait, or buy the cheapest replacement and re-cut the hole. Buying to these numbers removes the choice.

• Buy the diameter you actually bore. The chart runs 12 mm to 80 mm in the steps boring heads are built around, so hinge cup and dowel sizes come from one supplier.
• Fit the head you already own. Round shank, 10 mm on the 12–28 mm sizes and 25 mm at 80 mm, matching the collet size your boring head lists for that diameter.
• Load opposite spindles without thinking. Black is right hand, orange is left hand, so a multi spindle head gets correct handedness on both sides at 57 mm or 70 mm.
• Cut the rework on the entry face. Four symmetrical flutes share the cut, which keeps the rim of a blind hole clean instead of chipped and burnished.
• Order 50 pieces, not a container. Customization starts at 50 pcs against your artwork, so a non-standard diameter or your own marking needs no full production run.
• Keep the edges until the job ships. Individually packed bits inside an export carton arrive un-nicked, which matters on air, sea or express freight.

12 mm to 80 mm of cutting diameter. The size chart lists 12 mm, 15–26 mm in 1 mm steps, 30, 32, 34–38 mm, 40, 50, 53, 55, 60, 65, 70 and 80 mm, and 15–40 mm is the standard range. Both 57 mm and 70 mm overall lengths are available across those steps.

By color: orange is left hand, black is right hand. That coding lets a boring head with spindles turning in opposite directions be loaded from one carton, without checking flute direction by eye.

Round shank, 10 mm on the 12–28 mm cutting sizes. Above that the shank steps up with the diameter: 11 mm at 30 mm, 18 mm at 40 mm, and 25 mm at the 80 mm size. Match the shank figure to your collet before ordering.

Micro grain tungsten steel. The head is joined to the body by a low temperature welding process, so the weld zone keeps its hardness, and the surface is treated to reduce friction against the bore wall.

Only the overall length. Every diameter in the chart is offered at both 57 mm and 70 mm, and the shank diameter for a given cutting diameter is the same in both, so the choice comes down to what the boring head has room for.

Yes, customization is supported from 50 pcs. Send an artwork file first so the marking is reproduced exactly as approved; drills are then made to that artwork and to the diameter you specify.

Each bit is packed individually, then packed into a standard export carton. Carton size follows the quantity you order, so a 50-piece customization order and a full production order are not forced into the same box.

By air, by sea or by express, whichever suits the order quantity. Express is used for small and urgent lots. Freight is quoted once the destination is confirmed, because the rate changes with it.