M42 Cobalt Drill Bit Set For Stainless Steel TiN Coated Hss Jobber 135° Split Point
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.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.