Irwin 3016033 Cobalt Alloy Ste...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3.39
Irwin 3016033 Cobalt Alloy Steel Jobber-Length Drill Bit, 5/16 In. x 4-1/2 In., 135° Split-Point

Irwin 3016033 Cobalt Alloy Steel Jobber-Length Drill Bit, 5/16 In. x 4-1/2 In., 135° Split-Point

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Model: 3016018

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

$3.39
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Irwin 3016033 Cobalt Alloy Steel Jobber-Length Drill Bit, 5/16 In. x 4-1/2 In., 135° Split-Point

The Irwin 3016033 Cobalt Alloy Steel Jobber-Length Drill Bit is part of Irwin's 30160 Series, engineered for drilling into hardened steel, alloys, titanium nitride coated material, and stainless steel. This bit measures 5/16 In. in diameter by 4-1/2 In. overall length and is built from tough cobalt alloy steel with sturdy web construction for demanding metal-drilling applications. A 135° split-point tip resists walking for accurate, on-target hole starts, while a gold oxide finish adds surface durability. The 30160 Series lineup also includes additional models such as 3016018, 3016020, and 3016022, giving shops and jobsites a range of jobber-length cobalt bit sizes built on the same heavy-duty construction.

Key Features

  • Trade Size: 5/16 In. diameter x 4-1/2 In. overall length, a jobber-length profile suited for standard-depth drilling.
  • Durable Construction: Cobalt Alloy Steel construction delivers high heat and abrasion resistance for heavy-duty metal drilling.
  • Heavy-Duty Use: Built to tackle abrasive alloy metal drilling on hardened steel, alloys, titanium nitride coated material, and stainless steel.
  • Precise Drilling: 135° split-point tip eliminates walking for accurate hole placement.
  • Sturdy Web Construction: Reinforced web design adds strength for demanding drilling tasks.
  • Straight Shank: Straight shank design for standard chuck compatibility.
  • Finish: Gold oxide coated finish for added surface durability.

Technical Specifications

  • Warranty: None
  • Bit Type: Cobalt Jobber
  • Claims Needed: No
  • Individual Vs. Set (Syndigo): INDIVIDUAL
  • Country of Origin: CHN
  • Battery Included: No
  • Power Source: NON-ENERGY USING

Typical Applications

  • Drilling Hardened Steel and Alloys
  • Metal Fabrication and Machining
  • Titanium Nitride Coated Material Drilling
  • Stainless Steel Drilling
  • Heavy-Duty Industrial and Shop Applications

Why Irwin?

Irwin engineers the 30160 Series cobalt alloy steel jobber-length bits with sturdy web construction and a 135° split-point tip to deliver dependable performance on hardened steel, alloys, titanium nitride coated material, and stainless steel. The gold oxide finish, combined with heat-and-abrasion-resistant cobalt alloy steel construction, makes the 3016033 and its 30160 Series counterparts, including models 3016018, 3016020, and 3016022, a reliable choice for professionals and DIYers tackling demanding metal-drilling tasks that call for precision and durability.

Manufacturer Resources

Product Specs

Bit Type:
Cobalt Jobber
Claims Needed:
No
Individual Vs. Set (Syndigo):
INDIVIDUAL
Product Material Group:
METAL
Battery Included:
No
Product Primary Material:
Cobalt Alloy Steel
Power Source:
NON-ENERGY USING
Coating:
Gold Oxide
list_batch:
IRW-20260923
Product Type:
Twist Drill Bit
Product Finish:
Gold Oxide
Series:
30160 Series
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
Cobalt Alloy Steel
Product Size:
5/16 In.
Product Width:
1.9 inches
Product Group:
Power Tools & Accessories

Irwin 3016018 – Frequently Asked Questions

1) Will a cobalt jobber bit like the Irwin 30160 Series actually drill stainless steel, or do I need something else?
Cobalt alloy steel is the right pick for stainless. The Irwin 30160 Series jobber bits are built for hardened steel, alloys, titanium nitride coated material, and stainless, because cobalt holds its edge as heat builds instead of softening the way a plain HSS bit does. Run slower speeds and steady pressure with cutting fluid and the 135 degree split point will start the hole without wandering on a hard, slick surface.
2) What sizes does the Irwin 30160 Series cobalt jobber bit come in?
Three sizes, each with its own overall length: 9/32 in. x 4-1/4 in. (MPN 3016018), 5/16 in. x 4-1/2 in. (MPN 3016020), and 11/32 in. x 4-3/4 in. (MPN 3016022). The 5/16 in. is the common tap-drill and clearance size of the three; order by the MPN so you get the diameter you need.
3) Why does the 135 degree split point matter instead of a standard 118 degree tip?
A 135 degree split point is flatter and self-centering, so it bites where you put it rather than skating across hard or polished metal. That means you can skip the center punch on most work and get cleaner, on-location holes in hardened steel and stainless. A standard 118 degree tip walks more and generally needs a pilot divot first.
4) Is a jobber-length bit long enough for drilling through structural steel or electrical enclosures?
Jobber length is the standard-depth profile, and at 4-1/2 in. overall on the 5/16 in. size the usable flute depth is a few inches, which covers enclosure walls, strut, angle iron, and plate up to typical structural thicknesses. For deep holes or reaching past an obstruction you want an aircraft-extension or taper-length bit instead.
5) What does the gold oxide coating on these Irwin cobalt bits do?
The gold oxide finish adds surface durability and helps chips clear as the flutes heat up during metal drilling. It is a surface treatment, not a titanium nitride hard coating, so when the bit is resharpened the coating is gone from the cutting lip, the cobalt substrate underneath is what keeps cutting.
6) Is the Irwin 3016033 sold as one bit or as a set?
Single bit, sold individually, not as an index or kit. If you want to cover more than one diameter you order each size separately, 3016018 for 9/32 in., 3016020 for 5/16 in., or 3016022 for 11/32 in.
How fast can I get the Irwin 3016018 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 3016018 come with a warranty?
Absolutely. The Irwin 3016018 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 3016018?
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 3016018 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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