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ProductsHigh Precision Solid Carbide Spot Drill Bit 60° 90° 120° - CNC Spotting Tool for Steel
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High Precision Solid Carbide Spot Drill Bit 60° 90° 120° - CNC Spotting Tool for Steel

Maximize centering accuracy with our Solid Carbide Spot Drill Bits for steel. Available in 60°, 90°, and 120° angles with diameters from 0.3mm to 12mm. Durable AlTiN coating options, factory-direct pricing, and fast global shipping. Get a free sample today!

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Product Function

The Solid Carbide Spot Drill Bit is designed to create a precise starting point (dimple) for a secondary drilling operation. Its primary functions are:
  • Centering: Prevents the following drill bit from "walking" or deviating, ensuring high positional accuracy.
  • Chamfering: The 90° spot drills can perform both spotting and chamfering (countersinking) in a single operation, saving tool change time.
  • Reduced Vibration: The rigid design minimizes chatter, providing a superior surface finish on the workpiece.

Product Features

  • Premium Material: Manufactured from Ultra-Fine Micro Grain Tungsten Carbide, offering exceptional hardness and wear resistance specifically optimized for machining steel (carbon steel, alloy steel, tool steel).
  • Optimized Geometry: Features a robust web design and precise point geometry to reduce cutting forces and ensure excellent chip evacuation.
  • Versatile Angles: Available in 60°, 90°, and 120° point angles to match various secondary drill tips and chamfering requirements.
  • Wide Range of Sizes: Diameters ranging from micro-drills (0.3mm) up to 12mm, covering almost all CNC spotting needs.
  • Surface Treatment: Optional high-performance coatings (like TiAlN/AlTiN) available to extend tool life and allow for higher cutting speeds.

Specifications

60° Spot Drill Dimensions

Cutter Diameter (mm)
Angle
Length of Cut (L2)
Shank Diameter (h6)
Overall Length (L1)
1.0
60°
3
4
50
1.5
60°
4.5
4
50
2.0
60°
6
4
50
2.5
60°
7.5
4
50
3.0
60°
9
3
50
3.0
60°
9
4
50
4.0
60°
12
4
50
5.0
60°
15
5
50
6.0
60°
18
6
50
8.0
60°
24
8
60
10.0
60°
30
10
75
12.0
60°
36
12
75

90° Spot Drill Dimensions

Cutter Diameter (mm)
Angle
Length of Cut (L2)
Shank Diameter (h6)
Overall Length (L1)
0.3
90°
0.9
4
50
0.4
90°
1.2
4
50
0.5
90°
1.5
4
50
0.6
90°
1.8
4
50
0.7
90°
2.1
4
50
0.8
90°
2.4
4
50
0.9
90°
2.7
4
50
1.0 - 2.9 (0.1 Incr.)
90°
3 x Dia
4
50
3.0
90°
9
3
50
3.0
90°
9
4
50
3.1 - 3.9 (0.1 Incr.)
90°
3 x Dia
4
50
4.0
90°
12
4
50
4.0 (Long)
90°
12
4
75 / 100
4.5
90°
13.5
6
50
5.0
90°
15
5
50 / 100
5.5
90°
16.5
6
50
6.0
90°
18
6
50 / 100
6.5
90°
19.5
8
60
7.0
90°
21
8
60
8.0
90°
24
8
60 / 100
10.0
90°
30
10
75 / 100
12.0
90°
36
12
75 / 100
(Note: Detailed increments of 0.1mm are available for diameters 0.3mm to 3.9mm as per catalog)

120° Spot Drill Dimensions

Cutter Diameter (mm)
Angle
Length of Cut (L2)
Shank Diameter (h6)
Overall Length (L1)
1.0
120°
3
4
50
1.5
120°
4.5
4
50
2.0
120°
6
4
50
2.5
120°
7.5
4
50
3.0
120°
9
3
50
4.0
120°
12
4
50
5.0
120°
15
5
50
6.0
120°
18
6
50
8.0
120°
24
8
60
10.0
120°
30
10
75
12.0
120°
36
12
75

RPM/Feed Reference (For Steel)

Based on machining Alloy Steel / Carbon Steel (HRC 20-35)
Diameter (mm)
Cutting Speed (Vc m/min)
RPM (rev/min)
Feed (f mm/rev)
3.0
60 - 80
6300 - 8500
0.04 - 0.08
4.0
60 - 80
4800 - 6400
0.06 - 0.10
6.0
70 - 90
3700 - 4800
0.08 - 0.15
8.0
70 - 90
2800 - 3600
0.10 - 0.20
10.0
70 - 90
2200 - 2900
0.15 - 0.25
12.0
70 - 90
1800 - 2400
0.18 - 0.30
Note: These values are for reference. Please adjust speed and feed according to the actual rigidity of the machine, fixture, and specific material hardness.

Promotion Policy

We value every partnership and offer exclusive benefits to support your business:
  1. Free Sample: Free sample can be provided, if clients agree to pay for shipping cost.
  1. First Order Coupon: New clients can enjoy USD50 discount coupon for the first order, if the total order amount is more than USD500.
  1. Big Order Discount: Clients can enjoy 2%~5% discount, if the total order amount is more than USD5000.

Client Benefits

  • Factory Direct Savings: By eliminating middlemen, we provide premium carbide tools at competitive manufacturing prices.
  • Strict Quality Control: Every spot drill undergoes rigorous inspection for dimension accuracy and concentricity before shipment.
  • Customization Capabilities: Need a non-standard length or specific angle? As a manufacturer, we can customize tools to your blueprints.
  • Global Logistics: We work with top-tier couriers (DHL/FedEx/UPS) to ensure your tools arrive safely and on time.

FAQ

Q1: Can I use the 90° spot drill for chamfering? A: Yes! The 90° spot drill is excellent for both spotting and chamfering holes in one operation, which helps reduce cycle time.
Q2: Which angle should I choose, 90° or 120°? A: Generally, the spot drill angle should be equal to or larger than the secondary drill bit angle. For standard 118° twist drills, use a 120° spot drill. For 90° chamfering needs, use the 90° spot drill.
Q3: Do you have these in stock? A: We maintain a large stock of standard sizes (listed in the specifications above). These can usually be shipped within 24-48 hours.
Q4: Can these drill bits be used on Stainless Steel? A: While these are optimized for steel, they can handle stainless steel. However, for high-volume stainless steel production, please contact us for our dedicated Stainless Steel Series with specialized coating.