Irwin 63920 639 Series TiN-Coa...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5.79
Irwin 63920 639 Series TiN-Coated Jobber Length Drill Bit, 135° Split Point

Irwin 63920 639 Series TiN-Coated Jobber Length Drill Bit, 135° Split Point

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Model: 63920

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

$5.79
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Irwin 639 Series TiN-Coated Jobber Length Drill Bit, 135° Split Point

The Irwin 639 Series TiN-Coated Jobber Length Drill Bit brings a Titanium Nitride (TiN) coating and heavy-duty web design to demanding metal drilling applications, with a 135° split point that reduces feed pressure for easier penetration without work hardening. Offered across multiple sizes in the 639 Series lineup, including the 5/16" Model 63920, this jobber-length bit delivers extreme rigidity and up to six times longer tool life than standard high speed steel drill bits. Shorter cutting lips reduce torque when working in high tensile strength materials, and each bit is packaged individually on a card for easy retail display, making the 639 Series a dependable choice for metalworking and fabrication tasks where durability and precision matter most.

Key Features

  • Titanium Nitride Coating: extends bit life up to six times longer than standard high speed steel drill bits.
  • Heavy-Duty Web Design: provides extreme rigidity when drilling in metal applications.
  • 135° Split Point: reduces feed pressure for easier penetration without work hardening.
  • Shorter Cutting Lips: reduce torque when drilling in high tensile strength materials.
  • Jobber Length Configuration: sized for precision holes in metal, available across the 639 Series including the 5/16" Model 63920.
  • Individual Bit: sold individually rather than as part of a set.
  • Individual Packaging: carded for retail display and easy identification.

Technical Specifications

  • Warranty: NLW
  • Claims Needed: No
  • Country of Origin: CHN
  • Battery Included: No

Typical Applications

  • Drilling Holes in Metal and Steel Materials
  • Precision Hole Drilling in Metal Components
  • Metalworking and Fabrication Projects
  • High Tensile Strength Material Drilling
  • Professional and DIY Workshop Use

Why Irwin?

Irwin engineers the 639 Series drill bit with a Titanium Nitride coating and heavy-duty web design to deliver long-lasting performance and extreme rigidity for metal drilling. The 135° split point ensures easier penetration without work hardening, while shorter cutting lips help reduce torque in high tensile strength materials. Available across multiple sizes in the 639 Series, including the 5/16" Model 63920, these construction details make the line a dependable choice for professional tradespeople and DIY users tackling metalworking and fabrication projects that demand precision and durability. Whether you need the 5/16" Model 63920 or another size within the 639 Series, Irwin's consistent construction standards deliver reliable results project after project.

Manufacturer Resources

Product Specs

Warranty:
NLW
Bit Type:
Jobber
Claims Needed:
No
Individual Vs. Set (Syndigo):
INDIVIDUAL
Product Material Group:
METAL
Battery Included:
No
Power Source:
NON-ENERGY USING
list_batch:
IRW-20260923
Product Type:
Twist Drill Bit
Product Finish:
Titanium Nitride (TiN) Coated
Configuration:
Jobber Length
Angle:
135°
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Width:
1.9 inches
Product Group:
Power Tools & Accessories

Irwin 63920 – Frequently Asked Questions

1) What sizes does the Irwin 639 Series TiN-coated jobber drill bit come in?
Two diameters are offered: 5/16 inch (model 63920) and 1/2 inch (model 63932). Each is sold as a single bit, not as part of a set, and comes carded individually.
2) Can I use the Irwin 639 TiN drill bit in masonry or concrete?
No. The 639 Series is a high speed steel twist bit for metal and steel, intended for precision holes in metal components, fabrication work, and high tensile strength materials. Concrete, brick, and block need a carbide-tipped masonry bit or an SDS hammer bit. Running this bit in masonry will destroy the cutting edges.
3) Will an Irwin 639 Series bit fit a standard 3/8 inch drill chuck?
The 5/16 inch bit (63920) has a round shank under 3/8 inch, so it seats in a 3/8 inch keyless or keyed chuck without trouble. The 1/2 inch size (63932) is a jobber bit whose shank diameter would need to be confirmed against a 3/8 inch chuck capacity; on a 1/2 inch chuck drill or drill press, both sizes run fine.
4) Is a TiN-coated bit worth it over a plain black oxide HSS bit for drilling steel?
For repeat holes in steel, yes. The Titanium Nitride coating on the 639 Series is rated for up to six times the tool life of a standard high speed steel bit, and the heavy-duty web gives the bit more rigidity in metal. If you are drilling wood, plastic, or the occasional single hole in mild steel, a plain HSS bit does the job; the TiN coating pays off in metalworking and fabrication where the bit sees heat and volume.
5) What does the 135 degree split point on these Irwin bits actually do on the job?
The 135 degree split point is self-centering, so the bit starts on a flat metal surface without walking and often without a center punch. It also cuts feed pressure needed to penetrate, which keeps you from work hardening the material by pushing on a dull-starting bit. Shorter cutting lips reduce torque in high tensile strength stock, which matters on a hand drill in stainless or alloy steel.
6) Is jobber length the right choice, or do I need a stub or extra-long bit?
Jobber length is the general-purpose length and what the 639 Series is built as. It gives enough flute to clear chips through typical plate and structural steel thicknesses while staying stiff enough for hand drilling. If you are working in tight quarters or need maximum rigidity in hard material, a screw-machine (stub) length bit is shorter and deflects less. For drilling deeper than a jobber bit reaches, you need an aircraft-length or extension bit instead.
7) What size hole should I drill with these bits for a 1/2 inch bolt or a 3/8 inch tap?
The 1/2 inch bit (63932) drills a clearance-style hole for 1/2 inch hardware; the 5/16 inch bit (63920) is the standard tap drill size for a 3/8-16 UNC thread. Those are the two diameters the 639 Series offers, so pick by whether you are threading or passing a fastener through.
8) Does the Irwin 639 bit come in a set or do I buy sizes individually?
Individually. Each 639 Series bit ships as a single bit on its own card, so you order only the diameter you need, 5/16 inch or 1/2 inch. For MRO cribs standardizing on one hole size, that means you can restock that size alone rather than buying a full index.
9) Where are Irwin 639 Series drill bits made?
The 639 Series TiN-coated jobber bits are manufactured in China. That matters on public and institutional orders where country of origin has to be documented on the submittal.
How fast can I get the Irwin 63920 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 63920 come with a warranty?
Absolutely. The Irwin 63920 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 63920?
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 63920 from ZenSupply?
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