3D Solid Carbide Three Flute Micro Drill Bits

As a China manufacturer, RONGKE supplies 3D Solid Carbide Three Flute Micro Drill Bits for buyers who need short reach rather than extra tool length. The DS303C series is the compact option alongside the longer DS305C and DS308C drills. For a shallow feature, this keeps the working setup short without selecting an unnecessarily long tool.

The stated 3D class identifies the product family. Actual maximum drilling depth is listed as Ld for each diameter group. Use that dimension, together with the hole drawing and drill-point allowance, when confirming a model for production.

What Is a Three-Flute 3D Drill

It is a one-piece solid-carbide drill with three cutting edges and helical flutes. The edges are part of the tool body: there is no separate replaceable head or indexable insert to order. Although the product title uses “micro drill,” the standard range on this page starts at Ø5.0 mm.

Advantages for Short-Hole Production

Compact reach. A short tool helps limit deflection when the holder, spindle and workpiece are rigid. It is the starting option for holes that do not require a 5D or 8D tool.

Three-edge geometry. The catalogue describes a balanced cutting arrangement with special edge geometry intended to reduce cutting resistance and form fine chips.

Defined chip path. Wide chip pockets and helical flutes provide space for chips to leave the hole. Their effectiveness still depends on material, cutting data and coolant delivery.

Closely spaced diameter choices. The 0.1 mm catalogue increments let a supplier quote a specific standard diameter instead of substituting the nearest whole-millimetre size.

Specifications

The table below groups 3D Solid Carbide Three Flute Micro Drill Bits by catalogue dimensions. All dimensions are in mm; sizes within each group are listed in 0.1 mm steps.

Tool tolerances: cutting diameter m7; shank h6. These describe the drill dimensions, not a guaranteed finished-hole tolerance.

Catalogue example: DS303C-0500-020-06P — Ø5.0, Ld 20, Ø6 shank, P application code.

Material codes: P: general carbon steel; K: cast iron; M: stainless steel; A: non-ferrous metal. Confirm the material grade and hardness when ordering.

Coolant and cutting unit: The dimension table is headed coolant-fed. Confirm the supplied coolant configuration and holder connection; no pressure value is specified. Insert model: not applicable to this solid tool.

Dimensional source: RONGKE MAIN CATALOG, PDF pages 64–65 of 69. Ld is distinct from flute length Lf and overall length L.

Application Areas

Potential uses include short mounting holes in machined parts, fixture holes and limited-depth oil or air passages. Automotive parts and general CNC components are application examples; the workpiece material and hole requirement determine suitability.

For a locating hole with a controlled fit, confirm whether drilling alone is sufficient or a finishing operation is required. Do not assume that the tool’s m7 diameter tolerance establishes the final hole tolerance.

Production Process

A typical solid-carbide drill manufacturing route covers carbide blank preparation, flute and point grinding, edge finishing and dimensional inspection. For this three-flute design, the important outcomes are consistent cutting geometry, the specified shank and an unobstructed chip path. The exact RONGKE route, coating and inspection documents should be confirmed for the selected order; these steps are not a claim that every model receives the same treatment.

FAQ

How do I choose the correct 3D model?

Match the diameter to its Ld entry and check shank size, overall reach and the hole drawing. For example, Ø5.0 mm has a listed Ld of 20 mm; do not replace the catalogue value with a calculation based only on the 3D label.

Can I order a diameter below 5 mm?

It is outside the standard table shown here. Send the required diameter, depth and quantity for a feasibility review rather than treating it as a catalogue item.

Is a 3D tool preferable to a longer drill for a shallow hole?

Use the shortest suitable tool that provides the required access. A longer drill may be necessary for a recessed feature even when the hole itself is shallow; check the full tool approach.

Can the cutting head be replaced?

No. The DS303C is a solid-carbide tool, so its cutting edges are integral. A worn drill needs professional assessment for reconditioning or replacement, not a spare insert.

Does m7 mean the drilled hole will meet m7?

No. It is the cutting-diameter tolerance of the tool. Finished-hole size also depends on run-out, workpiece behaviour, tool condition and cutting parameters.

Can I reuse the feed from a two-flute drill?

Do not transfer it automatically or multiply it by the flute count. Start from the recommended data for the selected three-flute model and material, checking whether the feed is stated per revolution or per tooth.

What should I send for a bulk price?

For 3D Solid Carbide Three Flute Micro Drill Bits, send the required sizes and quantities, material and hardness, hole depth and tolerance, machine, holder and coolant method. This allows RONGKE to quote the correct configuration and review trial quantities before a larger order.