HSS-COBALT TiN Plating 90° Spotting Drill Bit DIN1897, 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-COBALT TiN Plating 90° Spotting Drill Bit DIN1897 Specifications
Designation: N
Material: Cobalt HSS
Standard: DIN1897
Finish: TiN
Spotting Drill for “seat” position accuracy
90° offers hole chamfering & spotting with the one tool
120° for spotting, matching a typical drill point
Only drill to the depth of the point
Refer to Carbide Drill section for VHM Spotting Drills
Applications
General workshop and trade drilling
Metal, plastic and timber
Fitters, fabricators and maintenance
HSS CO Cobalt Spot Weld Cutter Kit Cutting Accessories Can Separate Spot Welded Cobalt Tips 6.5mm/ 8mm/ 10mm
Made of high-speed steel with titanium coating, cobalt tip with high sharpness for easy drill of hard spot welds.
Each spotting weld drill bit has permanently etched size markings for quick identification.
Easily separate spot-welded panels without distorting the sheet metal, suitable for thin stainless steel sheets, iron sheets, or other thin metal sheets.
Allow the spot drill to stay briefly at the bottom of the hole after spotting it to guarantee a flat surface for the twist drill. Because of this, G82 is usually a better cycle to employ than G81.
Have you ever noticed the shape resemblance between a chamfer tool and a spot drill? Well, you can chamfer just well with a spot drill. While we are on the subject of what else you can accomplish with a Spot Drill, consider counterboring for flat head cap screws. Let’s kill two birds with one stone instead of spot drilling, drilling, and then countersinking. The one snag is that the countersink specification for US flat head cap screws asks for an 82-degree countersink, whereas spot drills are typically 90 degrees. It prompted me to create the graphic below, which summarizes everything:
The bolt size is first, followed by the estimated diameter of the head, according to a manufacturer on the internet.
Using some geometry, we can see that for a 90-degree angle, the cone of the cap screw is the hypotenuse of a right isosceles triangle, and 1/2 the head diameter is thus the depth.
Now a little trig, and we can determine the error between the 82-degree countersink and our 90-degree spot drill’s countersinking. As you can see, it isn’t microscopic, but I doubt it is the end of the world.
It should be noted that 82-degree spotting exercises are also available but in fewer sizes. They will be precise and error-free (pardon the pun!). 9pcs Spot Weld Drill Bit Set Welder Cutter Titanium Coated
A simple check shows that 82-degree and 90-degree spotting drills are the same. You’ll need to purchase a spotting drill with a diameter equal to the head diameter of the flat head cap screw you intend to spot and countersink. A 3/4″ dia spotting drill is only useful for 5/16″ and smaller screws. These spotting drills are not cheap, costing around twice as much as a countersink, so you’d better be able to justify the expense with time savings. If I was going to perform much drilling, I guess I’d learn to sharpen drill bits quickly. We can thus spot drill, counterbore, and chamfer. But, wait, there’s more! You can also use your spot drill to engrave V-Bits! 6pcs High Speed Steel Spot Drilling Set Weld Cutter Titanium Coated Bits
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SIZE
|
Diameter
|
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°
|
