HSS-CO Cobalt Drill Bit Set for Hardened Metal Drill Bits for Removing Welding Spot, HSS M42 Bit Spotting Drills with 90 Degree Angle, 120° HSS-COBALT SPOT DRILL SET 6, 8, 10, 12mm, Nc Spot Drill Hss Carbide Stub Center Bits 60 90 120 Degree, SPOTTING DRILL SET 90DEG HSS-COBALT TiNite Round Shank 90 Degree Drilling Tool, Spot Drill HSS Co Cobalt NC Center Bit 60 90 120 Degree, Carbide Spot Drill NC Spotting Drill Set, Woodworking Metalworking & Multipurpose Drill Bits China Supplier Factory
HSS-CO Cobalt Drill Bit Set for Hardened Metal Drill Bits for Removing Welding Spot Specifications
Material:High-speed Steel(HSS-CO Cobalt)
Titanium Coating Drill Bits;
Length:Approx.45mm /1.8in
Size:1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm).
Package Includes: 3pcs Cobalt Drill Bits
Features: The package includes 3pcs drill bit of 1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm) to meet different requirements.
1/4″ and 5/16″ and 3/8″ cutting diameters,made of cobalt-containing material;
Great for removing welding spot.
HSS-CO drill bit has wide range of uses, easy to carry, fine workmanship;
It is a good helper for car maintenance;
Product Content: You will receive 3 pieces of spot weld drill bits, a set to easily handle common automotive and metalworking needs. 3pcs Spot Weld Drill Bits High Speed Steel
9 Sizes: This set of sizes includes 1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm) designed for precision, suitable for most spot welds on vehicles, appliances or metal sheets. This drill is only for spot weld drills and cannot be used for other non-spot weld drills.
Safe Design: The sharp and centered design minimizes slipping, keeping your workpiece and fingers safe.
Premium Material: These drill bits are made of strong high-speed steel and reinforced with titanium coating, which is heat-resistant and durable to ensure long-lasting sharpness.
Efficient Tool: Replace time-consuming grinding or chiseling with these efficient cutters. A must-have tool set for mechanics, manufacturers and home garage enthusiasts. 7pcs M42 HSS High Speed Steel Titanium Plated Spotting Drill Bits Set
Can I use a spot drill instead of a centre drill?
Many machinists utilize centre drills for spotting instead of real spotting drills. Center drills are designed to provide a hole suitable for a lathe centre. They have a two-part tip with a tiny pilot and the bit’s bigger countersinking region. While centre drills are less expensive than spot drills, they do have certain drawbacks:
Suggestion: The little pilot tip, for example, is highly fragile, and if it breaks, the drill will stop cutting. Not a good thing if your profession requires you to find many holes. 7pcs HSS M42 Bit Spotting Drills with 90 Degree Angle
The angle of Large Spot: Another issue is that the whole angle of a centre drill is usually 60 degrees. When spotting, aim for an angle greater than the twist drill’s angle. The closer the first contact is to the outside diameter of the twist drill, the narrower the spot angle. If the flutes of the twist drill aren’t entirely polished, one will make contact with the spot hole before the other, causing the drill to deflect. It violates the goal of spot drilling and can lead to a less precise hole. Because of the wider angle of a true spot drill, the tip of the twist drill cuts first, resulting in a more precise hole. 120° HSS-COBALT SPOT DRILL SET 4 PCS 6, 8, 10, 12mm
Finally, the web of a spot drill is often narrower than a centre drill, allowing it to cut more readily and with less heat.
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SIZE
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Diameter
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Total Length
|
Flute Length
|
Cutting Angle
|
|
3.0
|
3
|
46
|
12
|
60° / 90° / 120°
|
|
4.0
|
4
|
55
|
14
|
60° / 90° / 120°
|
|
5.0
|
5
|
62
|
16
|
60° / 90° / 120°
|
|
6.0
|
6
|
66
|
18
|
60° / 90° / 120°
|
|
7.0
|
7
|
70
|
20
|
60° / 90° / 120°
|
|
8.0
|
8
|
79
|
22
|
60° / 90° / 120°
|
|
9.0
|
9
|
84
|
24
|
60° / 90° / 120°
|
|
10.0
|
10
|
89
|
26
|
60° / 90° / 120°
|
|
11.0
|
11
|
95
|
28
|
60° / 90° / 120°
|
|
12.0
|
12
|
102
|
30
|
60° / 90° / 120°
|
|
13.0
|
13
|
102
|
32
|
60° / 90° / 120°
|
