Minerallac High Speed Jobber D...
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Minerallac High Speed Jobber Drill Bit, 118° Point, Steel

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Model: 91611D

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

$8.99
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Minerallac High Speed Jobber Drill Bit, 118° Point, Steel

The Minerallac High Speed Jobber Drill Bit is a steel, high speed steel (HSS) jobber-length bit engineered with a 118° point for general-purpose drilling in metal, wood, and plastic. This family is available in sizes ranging from 7/32" up to 1/2", giving electricians, panel shops, and maintenance technicians a dependable bit selection for knockout prep, bracket mounting, and enclosure fabrication work on the job. Every size in the lineup shares the same steel HSS construction and 118° point geometry, the industry-standard angle that balances self-centering ability with efficient cutting speed across the common materials found on electrical and mechanical job sites.

Key Features

  • Size Range: Available from 7/32" to 1/2" diameter for precise, repeatable hole sizing across a range of electrical and mechanical assemblies.
  • Durable Construction: Manufactured from steel (high speed steel) for solid wear resistance and long working edge life across repeated drilling cycles, regardless of size selected.
  • 118° Point Geometry: The standard 118° point angle, shared across every size in the family, provides efficient chip clearance and reliable starts in metal and general-purpose materials.
  • Jobber Length: Standard jobber-length design offers versatile reach for a broad range of drilling depths without sacrificing rigidity, across all sizes in the lineup.
  • High Speed Steel: HSS construction supports use across metal, wood, and plastic substrates commonly encountered in electrical installation and fabrication work.
  • Size Selection: Choose the 7/32" or 1/2" option to match your specific hole-size requirement on the job.

Technical Specifications

  • Size Range: 7/32" - 1/2"
  • Point Angle: 118°
  • Material: Steel (High Speed Steel)
  • Style: Jobber Drill

Typical Applications

  • Drilling Electrical Enclosures and Panels
  • Bracket and Hardware Mounting Holes
  • General Metal Fabrication and Maintenance Drilling
  • Commercial and Industrial Electrical Installations
  • Renovation and New Construction Projects

Why Minerallac?

Minerallac supplies steel jobber drill bits built for the durability and repeatable performance electrical and maintenance professionals rely on. Across the full 7/32" to 1/2" size range, the high speed steel construction and 118° point geometry make this family a dependable choice for everyday drilling tasks on the job site.

Manufacturer Resources

Product Specs

Department:
Electrical
Product Subgroup:
Drill & Driver Bits
list_batch:
MIN-20260924
Product Type:
Twist Drill Bit
Product Material:
Steel
Configuration:
118° Point
Product Group:
Power Tools & Accessories

Minerallac 91611D – Frequently Asked Questions

1) Will a Minerallac jobber bit drill steel electrical enclosures, or do I need something harder?
These are high speed steel bits with a 118 degree point, which is the general-purpose combination for drilling sheet steel enclosures, panels, wood, and plastic. For enclosure and bracket work in mild steel they are the right tool. For hardened or stainless stock, a cobalt bit such as the Milwaukee Cobalt RED HELIX line is the better choice.
2) Is the 1/2 inch Minerallac bit big enough for a 1/2 inch conduit knockout?
No. A 1/2 inch trade size conduit knockout is roughly 7/8 inch across, so the 1/2 inch bit (91629D) will not make it. Use the bit to drill the pilot hole for a knockout punch or step bit, then finish to size. The 1/2 inch size is sized for bolt and bracket mounting holes, not conduit openings.
3) What is a close equivalent to the Minerallac 118-degree jobber drill bit for general metal drilling?
The Minerallac jobber bit is high speed steel with a 118-degree point, offered in sizes from 7/32 inch to 1/2 inch. The closest general-purpose twist bit alternative is the Milwaukee THUNDERBOLT 48-89-2729, a black oxide-coated drill bit in 23/64 inch. Both are twist-style bits for metal and general materials; the Minerallac is bare HSS while the THUNDERBOLT carries a black oxide coating, and the Minerallac family covers a fractional size spread where 48-89-2729 is a single 23/64 inch size.
4) What does jobber length mean and is it long enough for drilling through a strut or stud?
Jobber length is the standard, most common drill length, giving moderate reach while staying rigid enough to resist wandering and snapping. It handles typical enclosure walls, brackets, strut, and framing members. It is not a long-reach bit; for deep masonry or through-wall work you would move to a dedicated bit such as the Milwaukee SDS-Max MX4 at 31 inches of usable length.
5) Why a 118 degree point instead of a 135 degree split point?
The 118 degree angle is the industry standard general-purpose geometry, balancing self-centering with cutting speed in metal, wood, and plastic. It benefits from a center punch on smooth steel to stop it walking. A 135 degree split point self-starts better on hard metal without punching, so pick that style if you are drilling a lot of unpunched stainless or hardened plate.
6) I need to cut a hole in tile or glass, not steel. Is the Minerallac jobber bit the wrong tool?
Yes, it is the wrong tool. The Minerallac jobber bit is high speed steel with a 118-degree point for metal, wood, and plastic. Hard, brittle materials call for an abrasive-grit bit such as the Lenox 12111-10DGHS diamond grit drill bit in 5/8 inch, which cuts by abrasion rather than with a cutting edge.
7) For standardizing one bit type across an electrical maintenance shop, how does the Minerallac jobber bit compare to the Milwaukee THUNDERBOLT line?
Both are twist drill bits suited to panel and bracket work. The Minerallac family runs one construction and geometry across its whole range, steel high speed steel with a 118-degree point in sizes 7/32 inch through 1/2 inch, so sizes behave consistently as technicians move between holes. The Milwaukee THUNDERBOLT 48-89-2729 is a black oxide-coated bit supplied in 23/64 inch, a size between common fractional steps that is useful for specific fastener clearances.
8) Can these bits be resharpened?
Solid high speed steel with no coating or carbide tip, so the 118 degree point can be reground on a drill grinder and put back to work. Keep the two cutting lips equal in length and at the same angle, or the bit will cut oversize.
How fast can I get the Minerallac 91611D 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 Minerallac 91611D come with a warranty?
Absolutely. The Minerallac 91611D 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 Minerallac 91611D?
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 Minerallac 91611D from ZenSupply?
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