Precision Twist Drill 091540 Hss Silver Deming Drill Bit

Product Description

The PRECISION TWIST DRILL 091540 is a high-speed steel (HSS) Silver Deming drill bit designed for heavy-duty drilling in metal, steel, and hard materials. Built with a 5/8 inch diameter tip and a 1/2 inch reduced parallel shank, this bit fits standard 1/2 inch drill chucks while delivering the cutting capacity of a larger diameter tool. The 3-flute geometry promotes chip evacuation and helps maintain cutting efficiency under load. The Silver Deming construction provides high resistance to abrasion, extending tool life in demanding production and maintenance drilling applications. Machinists, millwrights, and maintenance technicians rely on this style of bit for accurate large-diameter hole work.

This bit is suited for jobber-length drilling operations requiring a 4 inch depth of cut with a 6 inch overall length. The reduced 1/2 inch shank makes it compatible with standard drill presses, magnetic drills, and hand-held corded drills equipped with a 1/2 inch chuck. Typical applications include fabrication shops, industrial maintenance, HVAC rough-in work requiring large-diameter penetrations, and general metalworking where oversized chuck capacity is not available.

Key Features

• High-speed steel (HSS) construction for abrasion resistance in metal drilling
• 5/8 inch cutting diameter with 1/2 inch reduced parallel shank for standard chuck compatibility
• 3-flute design promotes chip clearing and consistent cutting performance
• 4 inch depth of cut with 6 inch overall length for jobber-length applications
• Silver Deming style — allows large-diameter drilling without a dedicated large-chuck machine

Compatibility

Designed as a jobber-length Silver Deming style drill bit compatible with any 1/2 inch keyed or keyless drill chuck on drill presses, magnetic base drills, and heavy-duty hand drills.

Installation Notes

Installation of this bit is performed by machinists, millwrights, or experienced technicians using a drill press or hand-held drill with a 1/2 inch chuck. Secure the reduced shank fully into the chuck before operation and verify the chuck is tightened properly on all jaws. Use cutting fluid or cutting oil when drilling ferrous metals to extend bit life and improve hole quality. Always wear appropriate eye protection and secure the workpiece before drilling.

Technical Specifications

• Diameter: 5/8 inches
• Shank Diameter: 1/2 inch reduced parallel
• Overall Length: 6 inches
• Depth of Cut: 4 inches
• Number of Flutes: 3
• Material: High-Speed Steel (HSS)
• Style: Silver Deming Jobber Length
• Weight: 0.3 pounds
• UPC: 086071915405

Standard Information

• Brand: PRECISION TWIST DRILL
• Manufacturer Part Number: 091540