---
product_id: 155839810
title: "Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit"
brand: "bosch"
price: "A$9"
currency: AUD
in_stock: true
reviews_count: 11
category: "Bosch"
url: https://www.desertcart.com.au/products/155839810-bosch-co2131b-1-16-in-x-1-7-8-in
store_origin: AU
region: Australia
---

# High-heat resistance for tough metals Thick web-helix for stability & fast drilling 8% cobalt alloy for 10x durability Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit

**Brand:** bosch
**Price:** A$9
**Availability:** ✅ In Stock

## Summary

> 🛠️ Drill like a pro, last like a legend.

## Quick Answers

- **What is this?** Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit by bosch
- **How much does it cost?** A$9 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/155839810-bosch-co2131b-1-16-in-x-1-7-8-in)

## Best For

- bosch enthusiasts

## Why This Product

- Trusted bosch brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Stability:** Thick web-helix design ensures superior stability and faster material removal, reducing your project time.
- • **Unmatched Durability:** Engineered with premium M42 cobalt alloy delivering 10x longer life than standard bits—work smarter, not harder.
- • **Versatile Metal Mastery:** Effortlessly drills stainless steel, cast iron, titanium, aluminum, and more—your go-to bit for any metal challenge.
- • **Optimized Grip & Control:** Split point tip and three-flat shank (for sizes 3/16”+) guarantee precise starts and secure bit retention.
- • **Heat-Resistant Performance:** Withstands extreme temperatures without losing sharpness, perfect for relentless metal drilling sessions.

## Overview

The Bosch CO2131B 1/16 in. x 1-7/8 in. Cobalt M42 Drill Bit is crafted from an 8% cobalt alloy, offering 10x the lifespan of standard bits. Its heat-treated, surface-hardened tip and thick web-helix design provide exceptional durability, stability, and precision when drilling tough metals like stainless steel, cast iron, and titanium. Ideal for professionals demanding high performance and longevity in metalworking.

## Description

Bosch Cobalt M42 Metal Drill Bits are engineered with upgraded M42 alloy, containing 8% cobalt. These hard-core cobalt bits deliver 10X life vs. standard bits, are jobber length and withstand high-heat applications. The thick web-helix design delivers fast material removal and increased stability. Bits that are 1/8 In. and larger feature a split point; bits 3/16 In. and larger feature a three-flat shank, for better bit grip. These cobalt drill bits provide superior performance in stainless steel and can be used to drill cast iron, titanium and other hard or abrasive metals.

Review: Best bits for drilling metal I have ever used - I bought the 14-piece cobalt set (upgrade over the Bosch titanium sets) almost two years ago (Jan 2024). I have been impressed enough with their performance to feel compelled to come back and review them, as well as buy a larger set (21-piece cobalt, which has a few sizes and duplicates that the 14-piece set doesn't include). In addition to occasional use of various sizes over the last two years on wood, PVC pipe, and aluminum, I used two of the bits in a single project to drill over a hundred holes in mild steel angle iron and rectangular tubing. I used a drill press, set up at a slower speed, along with plenty of cutting oil (sometimes reapplying midway through drilling a hole). In line with other bits I've used in the past, I expected the two bits I was repeatedly using to dull to the point of uselessness part-way through the project. Much to my surprise, both bits survived and still cut practically like they are new. Bottom line, if you are using these bits to drill into mild steel with a drill press set at a slower speed and generous application of cutting oil, these bits are a fantastic choice. I have also used these bits to drill into aluminum, PVC pipe, and woods of various hardnesses with absolutely no issues. Highly recommend any of the Bosch M42 cobalt bits.
Review: Great Quality - Great results in use. - High Quality - never had a cobalt set before but from using this set i've been highly impressed. These stay sharp longer and provide a better cut compared to standard high volume big-box store brands like Dewalt.

## Features

- COBALT M42 DRILL BIT: Provides upgraded m42 cobalt jobber-length bits designed for durability, high heat resistance and hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
- ENHANCED M42 ALLOY MATERIAL: Contains 8% cobalt alloy that delivers 10x life vs. standard bits
- HIGH-HEAT RESISTANT BITS: Withstand high-temperature applications for extended periods of time
- THICK WEB-HELIX DESIGN: Provides additional stability in tough applications
- SURFACE-HARDENED TIP: Penetrates tough abrasive materials
- METAL-DRILLING SOLUTION: Engineered to drill in metals such as stainless steel, cast iron and aluminum
- HEAT-TREATED MANUFACTURING PROCESS: Helps to ensure the strength of bits

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Q64J6LR |
| Assembled Diameter | 0.06 Inches |
| Batteries Required? | No |
| Best Sellers Rank | #2,138 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Jobber Drill Bits |
| Brand | Bosch |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (6,849) |
| Cutting Angle String | 135 Degrees |
| Cutting Diameter | 0.06 Inches |
| Date First Available | April 4, 2019 |
| Finish | Titanium |
| Finish Type | Titanium |
| Global Trade Identification Number | 00000346594447 |
| Included Components | (1) 1/16 In. X 1-7/8 In. Cobalt M42 Drill Bit |
| Item Package Quantity | 1 |
| Item Weight | 0.176 ounces |
| Item model number | CO2131B |
| Manufacturer | BOSCH |
| Material | Cobalt |
| Measurement System | Inch |
| Number of Flutes | 3 |
| Number of Pieces | 1 |
| Part Number | CO2131B |
| Pattern | Solid |
| Point Style | Split Point |
| Power Source | Crank |
| Shank Type | Straight |
| Shape | Rectangular |
| Size | 1/16 x 1-7/8 in. |
| Style | Industrial |
| Surface Recommendation | Aluminum,Stainless Steel,Cast Iron,Metal |
| Tool Flute Type | Spiral |
| UPC | 000346594447 |
| Unit Count | 10.0 Count |
| Warranty Description | Product Defects Only |

## Product Details

- **Cutting Angle String:** 135 Degrees
- **Cutting Diameter:** 1.5 Millimeters
- **Finish Type:** Titanium
- **Material:** Cobalt
- **Shank Type:** Straight

## Images

![Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit - Image 1](https://m.media-amazon.com/images/I/41RDEun-vAL.jpg)
![Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit - Image 2](https://m.media-amazon.com/images/I/51MCFlfVnCL.jpg)
![Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit - Image 3](https://m.media-amazon.com/images/I/519O0yvOYGL.jpg)
![Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit - Image 4](https://m.media-amazon.com/images/I/61S9mIoIDPL.jpg)
![Bosch CO2131B 1/16 in. X 1-7/8 in. Cobalt M42 Drill Bit - Image 5](https://m.media-amazon.com/images/I/61ZQB21ae6L.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best bits for drilling metal I have ever used
*by J***R on November 30, 2025*

I bought the 14-piece cobalt set (upgrade over the Bosch titanium sets) almost two years ago (Jan 2024). I have been impressed enough with their performance to feel compelled to come back and review them, as well as buy a larger set (21-piece cobalt, which has a few sizes and duplicates that the 14-piece set doesn't include). In addition to occasional use of various sizes over the last two years on wood, PVC pipe, and aluminum, I used two of the bits in a single project to drill over a hundred holes in mild steel angle iron and rectangular tubing. I used a drill press, set up at a slower speed, along with plenty of cutting oil (sometimes reapplying midway through drilling a hole). In line with other bits I've used in the past, I expected the two bits I was repeatedly using to dull to the point of uselessness part-way through the project. Much to my surprise, both bits survived and still cut practically like they are new. Bottom line, if you are using these bits to drill into mild steel with a drill press set at a slower speed and generous application of cutting oil, these bits are a fantastic choice. I have also used these bits to drill into aluminum, PVC pipe, and woods of various hardnesses with absolutely no issues. Highly recommend any of the Bosch M42 cobalt bits.

### ⭐⭐⭐⭐⭐ Great Quality - Great results in use.
*by T***2 on January 18, 2026*

High Quality - never had a cobalt set before but from using this set i've been highly impressed. These stay sharp longer and provide a better cut compared to standard high volume big-box store brands like Dewalt.

### ⭐⭐⭐⭐⭐ 100% worth the cost
*by J***M on November 23, 2024*

Anything bosch makes is good, but i feel like they have it down pat when it comes to stuff like twist drills and bits. The M42 cobalt keeps the drill from getting too hot and also acts as a "lubricant", both contributing to keeping a sharp cutting edge, giving it quality and ease of use. These factors reduce the need for either resharpening, or worst, replacing the drill. The cost of cobalt bits are what scares people away, but if you're gonna be using it more than 2 or 3 times, its worth the upgrade from black oxide or a coated bit, thus giving it great value for money. The "M42" is a reference for the amount of cobalt used in the "material makeup" of the bit, with 8% cobalt being used in M42, and 5% cobalt in M35. Both are great options, but i recommend getting an M42 version when possible. The use of cobalt doesnt change the size or shape of the drill, although some will have different flute counts and designs, some tips have a "no pilot hole" start and some will have different degrees of an angle at the head to help with different types of material. Overall, storage capacity will not change unless you opt for different lengths, such as mechanics and aviation length. To sum this up, this is a great drill that should last a long time if used correctly. Bosch is very prevalent in my drill cabinet, so dont be afraid to spend a little extra and get the good one!

## Frequently Bought Together

- BOSCH CO2131B 1-Piece 1/16 In. x 1-7/8 In. Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
- Cicidorai M5 x 20mm 25mm 30mm 35mm 40mm Button Head Socket Cap Screws Bolts, 10.9 Grade Alloy Steel, Metric Allen Hex Drive, Black Oxide Finish, Fully Threaded, Assortment Kit 50Pcs
- Hilitchi 460-Pcs M3 M4 M5 Button Head Hex Socket Head Cap Bolts Screws Nuts Assortment Kit - 10.9 Grade Alloy Steel

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.com.au/products/155839810-bosch-co2131b-1-16-in-x-1-7-8-in](https://www.desertcart.com.au/products/155839810-bosch-co2131b-1-16-in-x-1-7-8-in)

---

*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-02*