HSS Cobalt Drill Bit

Contact for Price

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.

Send Inquiry WhatsApp Us

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	12	34
1.50	18	40
2.00	24	49
2.50	30	57
3.00	33	61
3.50	39	70
4.00	43	75
4.50	47	80
5.00	52	86
5.50	57	93
6.00	57	93
6.50	63	101
7.00	69	109
7.50	69	109
8.00	75	117
8.50	75	117
9.00	81	125
9.50	81	125
10.00	87	133
10.50	87	133
11.00	94	142
11.50	94	142
12.00	101	151
12.50	101	151
13.00	101	151
13.50	108	160
14.00	108	160
14.50	114	169
15.00	114	169
15.50	120	178
16.00	120	178
16.50	125	184
17.00	125	184
17.50	130	191
18.00	130	191
18.50	135	198
19.00	135	198
19.50	140	205
20.00	140	205

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.