Milwaukee Thunderbolt Black Oxide 21/64" Jobber Length Drill Bit 6-Pack 48-89-2837
REINFORCED WEB GEOMETRY FOR SUPERIOR SIDE-LOAD RESISTANCE
In high-torque drilling applications, standard bits often fail at the core when subjected to lateral pressure or uneven feed rates. The Milwaukee Thunderbolt series addresses this mechanical vulnerability with a significantly thicker web, providing the structural rigidity required for heavy-duty metal, wood, and plastic boring. This 21/64" bit utilizes a parabolic flute design that doesn't just clear chips—it evacuates them at a rate that keeps the cutting edge cool, preserving the temper of the high-speed steel and extending the professional's ROI. The 3-flat Secure-Grip shank is a critical design feature, ensuring that the drill's torque is fully realized at the tip rather than slipping in the chuck under heavy load.
- / Thunderbolt Web: Reinforced core design provides maximum durability and protects against breakage from side-load forces during handheld operation.
- / 135° Split Point: Precision-ground tip starts on contact, eliminating bit walk and the need for a center punch on curved or hard surfaces.
- / Parabolic Flute: High-efficiency geometry clears chips and debris rapidly to minimize heat buildup and maintain cutting speed.
- / 3-Flat Secure-Grip™ Shank: Machined flats prevent the bit from spinning in the drill chuck, ensuring consistent power transfer in high-torque scenarios.
- / Black Oxide Coating: Provides essential lubricity and corrosion resistance, reducing friction and extending bit life in demanding environments.
TECHNICAL SPECIFICATIONS
| Diameter | 21/64" |
| Decimal Equivalent | 0.3281" |
| Overall Length | 4-5/8" |
| Flute Length | 3-5/16" |
| Shank Type | 3-Flat Secure-Grip™ |
| Material / Coating | HSS with Black Oxide |
| Point Angle | 135° Split Point |
| Application | Metal, Wood, PVC |
WHAT'S IN THE BOX
(6) 21/64" Thunderbolt® Black Oxide Drill Bits (48-89-2837)
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
REINFORCED WEB GEOMETRY FOR SUPERIOR SIDE-LOAD RESISTANCE
In high-torque drilling applications, standard bits often fail at the core when subjected to lateral pressure or uneven feed rates. The Milwaukee Thunderbolt series addresses this mechanical vulnerability with a significantly thicker web, providing the structural rigidity required for heavy-duty metal, wood, and plastic boring. This 21/64" bit utilizes a parabolic flute design that doesn't just clear chips—it evacuates them at a rate that keeps the cutting edge cool, preserving the temper of the high-speed steel and extending the professional's ROI. The 3-flat Secure-Grip shank is a critical design feature, ensuring that the drill's torque is fully realized at the tip rather than slipping in the chuck under heavy load.
- / Thunderbolt Web: Reinforced core design provides maximum durability and protects against breakage from side-load forces during handheld operation.
- / 135° Split Point: Precision-ground tip starts on contact, eliminating bit walk and the need for a center punch on curved or hard surfaces.
- / Parabolic Flute: High-efficiency geometry clears chips and debris rapidly to minimize heat buildup and maintain cutting speed.
- / 3-Flat Secure-Grip™ Shank: Machined flats prevent the bit from spinning in the drill chuck, ensuring consistent power transfer in high-torque scenarios.
- / Black Oxide Coating: Provides essential lubricity and corrosion resistance, reducing friction and extending bit life in demanding environments.
TECHNICAL SPECIFICATIONS
| Diameter | 21/64" |
| Decimal Equivalent | 0.3281" |
| Overall Length | 4-5/8" |
| Flute Length | 3-5/16" |
| Shank Type | 3-Flat Secure-Grip™ |
| Material / Coating | HSS with Black Oxide |
| Point Angle | 135° Split Point |
| Application | Metal, Wood, PVC |
WHAT'S IN THE BOX
(6) 21/64" Thunderbolt® Black Oxide Drill Bits (48-89-2837)
