HSS Cobalt Drill Bit

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HSS cobalt drill bits (HSS-Co) are formulated with 5% cobalt content for enhanced red hardness and heat resistance, making them the preferred choice for drilling stainless steel, titanium, and heat-resistant alloys. The cobalt alloy allows the cutting edges to maintain hardness at elevated temperatures where standard HSS would soften and wear rapidly. These bits deliver reliable performance in demanding industrial applications including marine fabrication, oil and gas maintenance, and aerospace-grade metalworking.

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HSS Cobalt Drill Bit Technical Data

Other Drill Bit Types: HSS Jobber Drill Bit HSS Drill Bit 1/2" Parallel HSS Cobalt Drill Bit 1/2" Parallel HSS Taper Shank Drill Bit HSS Cobalt Taper Shank Drill Bit

Specification	Details
Grade	HSS-Co M35 (5% Cobalt)
Standard	DIN 338
Point Angle	135° Split Point
Shank Type	Parallel (Straight) Shank
Hardness	HRC 65-67
Application	Stainless Steel, Titanium, Heat-Resistant Alloys, Inconel
Surface Finish	Bronze / Straw-Coloured (Steam Tempered)

HSS Cobalt Drill Bit Size Chart (DIN 338)

~ Standard jobber lengths from 1mm to 20mm diameter. All dimensions in millimetres.

Diameter (mm)	Flute Length (mm)	Overall Length (mm)
1.00	15	37
1.50	17	40
2.00	20	44
2.50	22	47
3.00	25	51
3.50	27	54
4.00	30	58
4.50	32	61
5.00	35	65
5.50	37	68
6.00	40	72
6.50	42	75
7.00	45	79
7.50	47	82
8.00	50	86
8.50	52	89
9.00	55	93
9.50	57	96
10.00	60	100
10.50	62	103
11.00	65	107
11.50	67	110
12.00	70	114
12.50	72	117
13.00	75	121
13.50	77	124
14.00	80	128
14.50	82	131
15.00	85	135
15.50	87	138
16.00	90	142
16.50	92	145
17.00	95	149
17.50	97	152
18.00	100	156
18.50	102	159
19.00	105	163
19.50	107	166
20.00	110	170

Industrial HSS Cobalt Drilling Tools for Hard Material Drilling

HSS cobalt drill bits are essential tools for workshops that regularly machine stainless steel, titanium, and other high-temperature alloys. The addition of 5% cobalt to the high-speed steel matrix significantly improves red hardness, allowing the cutting edges to maintain their sharpness and cutting efficiency even when friction temperatures exceed 600°C. This makes cobalt bits the go-to choice for marine engineering, chemical plant maintenance, and oil and gas fabrication where stainless and alloy steels are common.

The 135° split point design reduces walking and drilling pressure, enabling self-centering starts without the need for centre punching. The precision-ground flutes provide efficient chip evacuation in both through-hole and blind-hole drilling operations. These bits are compatible with manual drills, drill presses, and CNC machines.

For applications requiring larger diameters with Morse taper drive, explore our HSS Cobalt Taper Shank Drilling Tools for heavy-duty machine tool mounting.