M42 Cobalt Drill Bit for Stainless Steel – TiN Coated Jobber Length, 135° Split Point
Product Overview
The M42 8% cobalt high-speed steel jobber drill bit is designed for drilling the hardest materials, including stainless steel, hardened alloys, and cast iron. With superior red hardness, a titanium nitride (TiN) gold coating, and a 135° split point, this drill bit ensures precision, durability, and extended tool life. Manufactured by XINGRUI, it is the professional choice for industrial metal drilling applications.
Applications
Stainless Steel: Austenitic and duplex grades
Hardened Steels: Tool steels, spring steels, heat-treated components
Cast Iron & Alloy Steel: Excellent for high-strength and abrasive metals
Non-Ferrous Metals: Titanium alloys, brass, bronze, nickel alloys
Industrial Fabrication: Automotive, aerospace, heavy machinery, metal workshops
⚠️ Not intended for wood or soft plastics.
Advantages
M42 HSS with 8% cobalt: Exceptional hardness and heat resistance
TiN coating: Reduces friction, increases wear resistance, and extends tool life
135° split point: Fast penetration, self-centering, reduced walking
Jobber length: Ideal balance of reach and rigidity
Straight shank: Fits standard keyed and keyless chucks
Fully ground finish: Ensures sharp cutting edges and accurate sizing
Specifications (Inch Sizes – ANSI Standard, 1/16” to 1/2”)
| Size (inch) |
Decimal (in.) |
Overall Length (mm) |
Flute Length (mm) |
| 1/16 |
0.0625 |
50 |
18 |
| 5/64 |
0.0781 |
55 |
24 |
| 3/32 |
0.0938 |
60 |
28 |
| 7/64 |
0.1094 |
65 |
33 |
| 1/8 |
0.1250 |
70 |
36 |
| 9/64 |
0.1406 |
75 |
40 |
| 5/32 |
0.1562 |
80 |
43 |
| 11/64 |
0.1719 |
85 |
47 |
| 3/16 |
0.1875 |
90 |
52 |
| 13/64 |
0.2031 |
93 |
55 |
| 7/32 |
0.2188 |
96 |
57 |
| 15/64 |
0.2344 |
100 |
60 |
| 1/4 |
0.2500 |
102 |
65 |
| 17/64 |
0.2656 |
107 |
70 |
| 9/32 |
0.2812 |
112 |
74 |
| 19/64 |
0.2969 |
116 |
77 |
| 5/16 |
0.3125 |
119 |
80 |
| 21/64 |
0.3281 |
123 |
84 |
| 11/32 |
0.3438 |
127 |
87 |
| 23/64 |
0.3594 |
131 |
90 |
| 3/8 |
0.3750 |
135 |
94 |
| 25/64 |
0.3906 |
138 |
97 |
| 13/32 |
0.4062 |
142 |
100 |
| 27/64 |
0.4219 |
146 |
103 |
| 7/16 |
0.4375 |
150 |
106 |
| 29/64 |
0.4531 |
152 |
109 |
| 15/32 |
0.4688 |
154 |
112 |
| 31/64 |
0.4844 |
156 |
114 |
| 1/2 |
0.5000 |
160 |
118 |
Metric sizes 1.0–13.0mm (0.5mm increments) also available.
Packaging Options
Single Pack: Individual PVC tubes or polybags
Bulk Pack: 10 or 20 pcs per plastic tube or box
Retail Pack: Blister cards, color boxes, or labeled cases
Set Options: 13, 19, and 29-piece jobber drill sets in metal or plastic cases
OEM/ODM: Custom branding, logo laser engraving, and private-label packaging
FAQ
Q1: Can this drill bit handle stainless steel?
Yes, it is specifically designed for stainless steel and other hard alloys.
Q2: What is the benefit of TiN coating?
It reduces heat, lowers friction, and provides up to 3× longer tool life.
Q3: How does M42 compare to M35?
M42 contains 8% cobalt, making it harder and more heat-resistant than M35 (5% cobalt).
Q4: What chuck types are compatible?
It fits standard keyed and keyless drill chucks with straight shank design.
Product Tags:
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M42 Cobalt Drill Bit Set For Stainless Steel TiN Coated Hss Jobber 135° Split Point Images
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