Irwin 301600 Series 9/64 In. x...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.12
Irwin 301600 Series 9/64 In. x 2-7/8 In. Cobalt Alloy Steel Jobber-Length Drill Bit, Gold Oxide Coated

Irwin 301600 Series 9/64 In. x 2-7/8 In. Cobalt Alloy Steel Jobber-Length Drill Bit, Gold Oxide Coated

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Model: 3016007

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1.12
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Irwin 301600 Series 9/64 In. x 2-7/8 In. Cobalt Alloy Steel Jobber-Length Drill Bit, Gold Oxide Coated

The Irwin 301600 Series 9/64 In. x 2-7/8 In. Cobalt Alloy Steel Jobber-Length Drill Bit is engineered for drilling through hardened steel and other abrasive metals, whether on the jobsite or in the workshop. Offered as Model 3016007 and Model 3016009, this bit features a straight shank compatible with both keyed and keyless chucks and a 135° split-point tip that prevents walking for faster, cleaner starts. The Cobalt Alloy Steel construction, finished with a Gold Oxide coating, delivers high heat and abrasion resistance for demanding metalworking applications that call for accuracy and durability pass after pass.

Key Features

  • Trade Size: 9/64 In. diameter x 2-7/8 In. overall length with a 1.125 In. shank length for precise, repeatable drilling in tight-tolerance applications.
  • Precise Drilling: 135° split-point tip eliminates walking and self-centers on contact, allowing for faster, cleaner drilling starts on hardened surfaces without the need for a center punch.
  • Heavy-Duty Use: Tackles metal drilling tasks, including abrasive alloy metal drilling on hardened steel, stainless steel, and other tough substrates.
  • Durable Construction: Cobalt Alloy Steel construction builds high heat and abrasion resistance into every bit, extending tool life under repeated heavy-duty use.
  • Chuck Compatibility: Straight shank design works with both keyed and keyless chucks, allowing use across a wide range of corded and cordless drills.
  • Finish: Gold Oxide coating adds wear resistance and helps reduce friction during drilling, keeping bits cooler and cutting cleaner over more holes.

Technical Specifications

  • Bit Type: Cobalt Jobber
  • Product Primary Material: Cobalt Alloy Steel
  • Product Material Group: Metal
  • Coating: Gold Oxide
  • Shank Length: 1.125 In.
  • Power Source: Non-Energy Using
  • Country of Origin: China
  • Warranty: None
  • Battery Included: No

Typical Applications

  • Drilling Hardened Steel and Abrasive Alloy Metals
  • General Metal Fabrication and Repair Work
  • Professional and DIY Metalworking Projects
  • Use with Keyed and Keyless Drill Chucks
  • Jobsite and Workshop Metal Drilling Tasks

Why Irwin?

Irwin builds the 301600 Series Cobalt Alloy Steel Jobber-Length Drill Bit, available as Model 3016007 and Model 3016009, for professionals and DIYers who need dependable performance on tough metal surfaces. The Cobalt Alloy Steel construction and Gold Oxide coating stand up to high heat and abrasion, while the 135° split-point tip keeps drilling accurate and efficient from the first pass, every pass. Choose Irwin for reliable, heavy-duty drill bits built to handle demanding metalworking jobs on the jobsite or in the shop.

Manufacturer Resources

Product Specs

Bit Type:
Cobalt Jobber
Claims Needed:
No
Product Material Group:
METAL
Power Source:
NON-ENERGY USING
Shank Length:
1.125 In
Individual Vs. Set (Syndigo):
INDIVIDUAL
Battery Included:
No
Product Primary Material:
Cobalt Alloy Steel
Coating:
Gold Oxide
list_batch:
IRW-20260923
Product Type:
Twist Drill Bit
Product Finish:
Gold Oxide
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
Cobalt Alloy Steel
Product Size:
9/64 In. x 2-7/8 In.
Product Width:
1.9 inches
Product Group:
Power Tools & Accessories
Product Length:
5.8 in

Irwin 3016007 – Frequently Asked Questions

1) Will an Irwin 301600 Series cobalt jobber bit drill hardened and stainless steel, or do I need carbide?
Cobalt alloy steel is the right call for hardened steel, stainless, and other abrasive alloys, which is exactly what the 301600 Series is built from. The gold oxide coating cuts friction so the bit runs cooler through tough substrates. Run it slow with cutting fluid and steady pressure; cobalt holds its edge at heat where plain HSS gives up. Carbide only becomes necessary on material harder than hardened tool steel or on abrasive non-metals.
2) Which sizes does the Irwin 301600 Series come in, and what are the part numbers?
Two sizes. Model 3016007 is 7/64 inch diameter with a 2-5/8 inch overall length, and model 3016009 is 9/64 inch diameter with a 2-7/8 inch overall length. Both are sold as individual bits, not as a set, so order by the model number for the diameter you need.
3) Does this Irwin cobalt bit fit a keyless chuck on a cordless drill?
It does. The 301600 Series uses a plain straight shank, so it clamps in both keyed and keyless chucks on corded or cordless drills. Shank length is 1.125 inches, which gives a keyless chuck plenty of jaw grip at these small diameters. No hex or quick-change adapter involved.
4) Do I need to center punch before drilling with this bit?
No. The 135 degree split point self-centers on contact and won't walk, so you can start a hole on a flat hardened surface without punching it first. That matters most on stainless and hardened plate, where a punch mark can work-harden the spot you're trying to cut.
5) Is a jobber-length bit long enough for drilling through steel plate or tube?
Jobber length is the general-purpose length and covers most plate, angle, and tube work. On the 301600 Series the overall lengths are 2-5/8 inches for the 7/64 bit and 2-7/8 inches for the 9/64, with 1.125 inches of that taken up in the chuck. Subtract the chuck grip and flute start, and your usable depth of cut is well under the overall figure, so for deep holes or reaching into a recess you want a longer aircraft-length or extension bit instead.
6) What is the difference between a gold oxide cobalt bit and a black oxide HSS bit?
The substrate is the real difference. The 301600 Series is cobalt alloy steel through the body, so the heat resistance is in the metal itself and survives resharpening. Black oxide HSS relies on a surface treatment over plain high-speed steel and softens sooner in hardened or stainless work. The gold oxide finish on the cobalt bit adds wear resistance and reduces friction, but it's the cobalt that buys you the tool life.
7) Can these cobalt bits be resharpened?
Yes. Cobalt is alloyed through the body rather than applied as a plating, so grinding the point back does not remove the heat-resistant material the way regrinding a coated HSS bit does. Regrind to the original 135 degree split point to keep the self-centering behaviour.
8) Do I get a set of bits or a single bit when I order model 3016009?
A single bit. The 301600 Series is catalogued as an individual item, so each order line is one bit in one diameter. If you need both the 7/64 and the 9/64, order model 3016007 and model 3016009 separately.
How fast can I get the Irwin 3016007 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Irwin 3016007 come with a warranty?
Absolutely. The Irwin 3016007 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Irwin 3016007?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Irwin 3016007 from ZenSupply?
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