Irwin 30160 Cobalt Alloy Steel...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.53
Irwin 30160 Cobalt Alloy Steel Jobber-Length Drill Bit, Gold Oxide Coating

Irwin 30160 Cobalt Alloy Steel Jobber-Length Drill Bit, Gold Oxide Coating

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Model: 3016010

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

$1.53
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Irwin 30160 Cobalt Alloy Steel Jobber-Length Drill Bit, Gold Oxide Coating

The Irwin 30160 Cobalt Alloy Steel Drill Bit is a jobber-length bit engineered for demanding metal-drilling applications, including hardened steel, abrasive alloy metals, Titanium Nitride-coated surfaces, and stainless steel. This bit is available in five sizes ranging from 5/32" x 3-1/8" up to 3/8" x 5", including 1/4" x 4", 3/16" x 3-1/2", and 15/64" x 3-7/8" options, so shops can match the bit to the job at hand. Built from tough Cobalt Alloy Steel with sturdy web construction, every size in this lineup delivers high heat and abrasion resistance for heavy-duty use, while a 135° split-point tip minimizes walking and starts precise holes without a center punch. A Gold Oxide coating adds extra durability against friction and wear during extended drilling sessions on the jobsite or in the shop.

Key Features

  • Size Range: Available in five jobber-length sizes — 5/32" x 3-1/8", 3/16" x 3-1/2", 15/64" x 3-7/8", 1/4" x 4", and 3/8" x 5" — to match a wide range of metal-drilling tasks.
  • Durable Construction: Cobalt Alloy Steel with sturdy web design delivers high heat and abrasion resistance for long tool life.
  • Precise Drilling: 135° split-point tip eliminates walking and centers the bit for accurate hole placement.
  • Heavy-Duty Use: Engineered to tackle metal drilling, including abrasive alloy metal drilling on hardened steel, Titanium Nitride-coated surfaces, and stainless steel.
  • Jobber-Length Design: Standard jobber-length sizing offers versatile reach for a variety of drilling depths and applications.
  • Finish: Gold Oxide coating helps reduce friction and resist corrosion during use.

Technical Specifications

  • Claims Needed: No
  • Country of Origin: CHN
  • Warranty: None
  • Battery Included: No

Typical Applications

  • Drilling Hardened Steel and Metal Alloys
  • Stainless Steel Fabrication and Repair
  • Titanium Nitride-Coated Material Drilling
  • Professional and Industrial Metalworking
  • General Maintenance and Jobsite Drilling
  • Fabrication Shops and Metal Repair Facilities

Why Irwin?

Irwin backs this cobalt alloy steel drill bit lineup with sturdy web construction and a 135° split-point tip engineered for accurate, heavy-duty performance on hardened and abrasive metals. The Gold Oxide coating and Cobalt Alloy Steel construction are built to withstand the heat and abrasion of demanding metal-drilling jobs, making this a reliable choice across all five sizes for professionals working with tough alloys and stainless steel 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
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 Group:
Power Tools & Accessories

Irwin 3016010 – Frequently Asked Questions

1) Will an Irwin 30160 cobalt bit drill stainless steel without burning up?
That's what the 30160 is built for. It's cobalt alloy steel rather than plain HSS, so it holds its edge under the heat that stainless and hardened steel generate, and Irwin specs it for abrasive alloy metals, hardened steel, Titanium Nitride-coated surfaces and stainless. Run it slow with cutting fluid and steady pressure, the way you would any cobalt bit in stainless.
2) What sizes does the Irwin 30160 cobalt jobber drill bit come in?
Five jobber-length sizes: 5/32 x 3-1/8 inch (MPN 3016010), 3/16 x 3-1/2 inch (3016012), 15/64 x 3-7/8 inch (3016015), 1/4 x 4 inch (3016016), and 3/8 x 5 inch (3016024). Each is sold as an individual bit, not a set, so pick the diameter you need for the hole rather than buying an index.
3) Do I need to center punch before drilling with these bits?
No. The 135 degree split point starts cutting on contact instead of skating across the surface, so it centers itself on flat metal without a punch mark. On a curved or polished surface a punch is still worth the few seconds.
4) Will these cobalt bits fit a standard 3/8 inch chuck drill?
Yes. These are straight-shank jobber bits in diameters from 5/32 up to 3/8 inch, so every size seats in a 3/8 inch keyless or keyed chuck. The 3/8 size uses the full chuck capacity, so snug it properly or it will slip under load.
5) Cobalt or standard HSS drill bits for drilling hardened steel?
Go cobalt for hardened and abrasive metals. The 30160 is a cobalt alloy steel bit with a sturdy web, built for heat and abrasion resistance in hardened steel, stainless and alloy work. Standard HSS is fine for mild steel, aluminum and wood, and it costs less per bit, but it dulls fast in stainless. Where you have both, keep the HSS for general holes and save the cobalt for the hard stuff.
6) Is the 15/64 inch size in this Irwin cobalt line for tapping 1/4-20 threads?
15/64 is the standard tap drill for a 1/4-20 UNC thread, and that size is offered in the 30160 cobalt line as a 15/64 x 3-7/8 inch bit, MPN 3016015. That pairing is why the odd size exists in a metalworking set.
7) What does the gold oxide coating on the Irwin 30160 actually do?
The gold oxide finish cuts friction in the hole and resists corrosion on the bit itself, which matters when you're running long drilling sessions in tough alloys or storing bits in a damp shop or truck box. It is a surface treatment, not a hardness coating like TiN, so the cutting performance comes from the cobalt alloy steel underneath.
8) How deep can I drill with a jobber-length bit like the Irwin 30160?
Jobber length gives you the standard flute depth for its diameter, and the overall lengths run 3-1/8 inch on the 5/32 bit up to 5 inches on the 3/8. Usable hole depth is less than overall length once the shank is in the chuck, so for anything deeper than a couple of inches in 3/8 you'd want an extension or a longer aircraft-length bit instead.
How fast can I get the Irwin 3016010 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 3016010 come with a warranty?
Absolutely. The Irwin 3016010 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 3016010?
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 3016010 from ZenSupply?
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