60 Degree Center Drill Bits Set HSS Countersink Tools – 1.0 To 6.0mm

60 Degree Center Drill Bits Set HSS Countersink Tools – 1.0 To 6.0mm, Hss Centre Drill A B R Type High Speed Steel For Industrial, HSS Cobalt Center Drill Bit for Centre Drilling, Solid Carbide HSS Central Drill Bit, M2 HSS 60° Angle Center Drill Bits Kit Countersink Tools, Carbide Center Drills, High-Speed Steel Center Drills, Center Drill Countersink Set, Woodworking Metalworking & Multipurpose Drill Bits China Supplier Factory

60 Degree Center Drill Bits Set HSS Countersink Tools – 1.0 To 6.0mm  Specifications
Drill Type High Speed Steel Center Drill Bit
Shank Type Straight Shank
Diameter 1.0mm-6.0mm
Shank Diameter 3mm-14mm
Total length 33mm-72mm
Point Angle 60° & 120°
Material High Speed Steel 6542
Coated Tin Coating
Use Metal working/Stainless Steel Processing
Machinable Materials Steel, Copper, Aluminum,Stainless steel,Iron,etc
Application Spot drilling
Applicable machine tools CNC machining center,CNC machine tools,engraving machines and other equipment
Feature Positioning, chamfering, sharp and wear-resistant
Centre drill bits are used in metalworking to provide a starting hole for a larger sized drill bit or to make a conical indentation in the end of a workpiece in which to mount a lathe centre.Complies with DIN332 standard.

1.Center drill bits can be used to make conical holes for a lathe center in order to make a starting point for a standard twist drill, designed to prevent the twist drill from walking, as well as for producing center holds in components or work pieces with require machining between centers.

2.Available for all Kinds of Materials: Metal,Alloy, Copper,Iron,Aluminum, and so on.

3.Durable and Resistance: Center drill bit is made of HSS high speed steel, with extremely sharp blade, low consumption and durable with impact resistance, wear resistance.

1. DIN 333A (Type A)

* Geometry: This is the most common and widely used type. It features a chamfered transition (typically a truncated cone geometry) between the pilot diameter (D3) and the cutting head diameter. This chamfer creates a bevelled edge. HSS6542 Centre Drill Bits Titanium Plated Type-A

* Grooves: Type A centre drills have two flutes/grooves, similar to a small twist drill, which aid in chip formation and evacuation. This makes them quite efficient at drilling.

* Function: The chamfer on the Type A allows it to produce centre holes with a 60-degree conical seating surface (essential for lathe work) *and* cut a small pilot diameter hole at the base of this cone. This pilot hole guides subsequent drills and prevents the larger drill tip from contacting the steepest part of the cone.

* Applications: The DIN 333A is considered the standard or universal centre drill. It is suitable for a wide range of materials and is commonly used for:

* Starting drill holes accurately before drilling with standard twist drills. HSS High Speed Steel Center Drill Bit Type A-Metric

* Creating centre holes for lathe work (between centres turning).

2. DIN 333B (Type B)

* Geometry: The Type B also features a chamfered transition similar to the Type A.

* Grooves: The crucial difference lies in its design – it has no flutes/grooves. It relies solely on its cutting lip geometry for material penetration.

* Function: Like the Type A, the Type B creates a centre hole with a 60-degree cone. However, it does NOT drill a pilot hole. The cutting action stops at the base of the conical recess. M35 HSS-Co (5%) Titanium-Coated Centre Drill Bits Type-A

* Applications: The absence of a pilot hole makes the Type B specifically useful for thin-walled workpieces, such as tubes or thin sheet metal. A pilot hole penetrating through the thin wall could weaken the material significantly or provide a point for stress concentration. The Type B is preferred in these delicate situations where only a conical recess is needed for location or support without piercing through.

3. DIN 333R (Type R)

* Geometry: This type features a rounded (radiused) transition between the pilot diameter and the cutting head. It eliminates the sharp chamfered edge of the A and B types.

* Grooves: Type R centre drills typically have two flutes/grooves like the Type A. HSS DIN332 Center Drill Bit For Hole Drilling

* Function: Its primary function is to create centre holes required for lathe work involving rotating centres (e.g., ball bearing centres, revolving centres). The rounded transition minimizes the risk of the rotating centre point catching or interfering with the front edge of the centre hole, especially important for automatic feed operations like CNC lathes or auto-fed turret lathes. It can also produce a centre hole with a pilot diameter hole, useful for subsequent drilling operations where catching isn’t a concern.

* Applications: The DIN 333R is essential when using rotating centres on a lathe to prevent interference and potential damage. It offers increased safety and reliability in automated or high-speed turning applications. Its design reduces the likelihood of the centre drill catching during retraction in CNC operations. Sometimes specified simply to avoid a sharp edge that might cause stress concentration, though its prime purpose is compatibility with rotating centres.  Custom HSS DIN333 Center Drills Hole Making For Center Drilling

 

Type A HSS Center Drill
d	D	L	I
1.00	3.15	33.50	1.90
1.25	3.15	33.50	1.90
1.60	4.00	37.50	2.80
2.00	5.00	42.00	3.30
2.50	6.30	47.00	4.10
3.15	8.00	52.00	4.90
4.00	10.00	59.00	6.20
5.00	12.50	66.00	7.50
6.30	16.00	74.00	9.20
Type B HSS Center Drill
d	D	L	I
1.00	4.00	37.50	1.90
1.25	5.00	42.00	2.20
1.60	6.30	47.00	2.80
2.00	8.00	52.00	3.30
2.50	10.00	59.00	4.10
3.15	11.20	63.00	4.90
4.00	14.00	70.00	6.20
5.00	18.00	78.00	7.50
6.30	20.00	83.00	9.20
Type R HSS Center Drill
d	D	L	I
1.00	3.15	33.50	3.00
1.25	3.15	33.50	3.35
1.60	4.00	37.50	4.25
2.00	5.00	42.00	5.30
2.50	6.30	47.00	6.70
3.15	8.00	52.00	8.50
4.00	10.00	59.00	10.60
5.00	12.50	66.00	13.20
6.30	16.00	74.00	17.00

Other specification is also available according to your requirements. (OEM, ODM )
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