HSS 60 Degree Center Drill Bits

The RONGKE HSS 60 Degree Center Drill Bits  reference configuration follows DIN 333 Form A and uses a 60° included angle for the centering cone. During drilling, the smaller pilot section enters the workpiece first, followed by the conical section that forms the center seat.

This makes the tool particularly relevant to shafts, pins and turned components that need to be supported between centers during subsequent machining. When selecting the drill, the pilot diameter, body diameter and required center-hole form should therefore be considered together rather than treating the tool as a conventional small-diameter drill.

Key Facts at a Glance

Technical Specifications

Common reference sizes in mm. Final material, geometry, dimensions and availability are confirmed with the quotation.

Why the 60° Geometry Matters

The 60° specification is not simply another dimensional figure on the drawing. It describes the included angle of the centering cone and therefore forms part of the interface between the machined center hole and the center used to support the workpiece.

For procurement, specifying only the phrase “center drill” may leave too much room for interpretation. A clearer requirement identifies the center-hole form, cone angle and pilot diameter.

The RONGKE reference design uses:

● DIN 333 Form A

● 60° included angle

● HSS

● Right-hand cutting

● Cylindrical body

● Uncoated finish

This gives buyers a defined configuration to work from when comparing tooling or placing repeat orders.

Where Center Drills Fit in Machining

Shafts and Round Bars

A center hole can be prepared at the end of a shaft or round component before it is positioned between centers for further machining.

Pins and Small Turned Parts

The compact center-drill format is suitable for parts where a defined center location is required before subsequent turning or related operations.

Between-Centers Turning

For workpieces supported by a center, the initial center-hole operation becomes an important preparation step. The center drill establishes the pilot and conical seating surface used for that support.

General Workshop Machining

The HSS 60 Degree Center Drill Bits reference configuration can be used for suitable metal components where the required center-hole form and workpiece conditions match the tool.

RONGKE Precision Hole-Processing Capability

RONGKE develops and manufactures precision hole-processing cutting tools with in-house R&D, production and inspection capabilities. An independent laboratory, imported 5-axis tool grinding equipment and dedicated inspection instruments support its manufacturing system. Alongside standard cutting tools, RONGKE also works on non-standard tooling requirements and can provide technical selection guidance or sample trial cutting when a specific machining application needs verification.

What to Specify When Ordering

For HSS 60 Degree Center Drill Bits quotation, send RONGKE the pilot diameter, body diameter, center-hole form and workpiece material. If the tool will be used for a specific production process, the required center-hole depth, machine type and order quantity are also useful.

A typical enquiry can be written as:

HSS center drill, DIN 333 Form A, 60°, pilot diameter 2.0 mm, body diameter 5.0 mm, for [workpiece material], required quantity [X].

If the required size is not included in the reference table, provide the target dimensions for a non-standard tooling review.

FAQ

What HSS 60 Degree Center Drill Bitsl used for?

HSS 60 Degree Center Drill Bits are primarily used to prepare center holes in shafts, pins and turned components, especially before machining operations where the workpiece will be supported between centers.

What does the 60° angle refer to?

The 60° refers to the included angle of the centering cone, not the angle of the pilot drill.

What is DIN 333 Form A?

DIN 333 Form A is the reference form used for this type of center drill. The RONGKE configuration combines the Form A design with a 60° centering cone.

What is the difference between pilot diameter and body diameter?

The pilot diameter d1 corresponds to the smaller drilling section that forms the pilot hole. The body diameter d2 refers to the larger main body of the tool and should be checked against the holding arrangement.

Which diameter should I use when selecting a center drill?

Begin with the required pilot diameter and center-hole form, then check the body diameter and machine holding capacity. Both dimensions are important, but they describe different parts of the tool.

Is this drill suitable for deep holes?

No. A center drill is intended for center-hole preparation, rather than deep-hole drilling.

Is the RONGKE reference center drill coated?

The listed reference configuration is uncoated HSS.

What sizes are available?

The reference sizes listed by RONGKE range from 1.00 to 4.00 mm pilot diameter and 3.15 to 10.00 mm body diameter, with overall lengths from 31.5 to 56.0 mm.

Can RONGKE produce non-standard center drills?

RONGKE has experience developing non-standard hole-processing cutting tools. Buyers can provide the required pilot, body diameter, center-hole geometry and machining conditions for technical evaluation.