Osg 1069100 Straight Flute Tap 10-24 Unc Bottoming Hss

Product Description

The OSG 1069100 is a straight flute bottoming tap designed to cut internal threads in pre-drilled holes where thread engagement is required close to the bottom of a blind hole. Made from high-speed steel with a bright uncoated finish, it cuts a 10-24 UNC right-hand thread. The bottoming chamfer provides only 1 to 2 threads of lead, allowing the tap to thread nearly to the full depth of a blind bore. With an overall length of 2.375 inches and a thread length of 0.875 inches, this tap is sized for standard hand-tap or machine-tap applications in metalworking and maintenance operations. Licensed machinists, tool and die technicians, and maintenance mechanics are the primary users.

This tap is suited for threading operations in both production and repair contexts. It performs in a range of ferrous and non-ferrous materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The straight flute geometry makes it appropriate for through holes and short blind holes where chip ejection back through the entry is acceptable. It is typically used as the third tap in a hand-tapping sequence following a taper and plug tap, or as the primary tap on CNC equipment with appropriate feed control.

Key Features

• Bottoming chamfer for threading to near-full depth in blind holes
• High-speed steel construction provides wear resistance across a range of workpiece materials
• Bright uncoated finish suitable for use with cutting oils and standard tap lubricants
• H2 thread limit for controlled fit tolerance in standard UNC threading applications
• 2-flute straight flute design supports chip flow in through-hole and short blind-hole work
• Right-hand thread direction, 10-24 UNC - compatible with standard 10-24 fastener assemblies

Compatibility

Designed for tapping 10-24 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of OSG Series 104.

Installation Notes

This tap is installed using a standard tap wrench or machine tap holder. Secure the workpiece before tapping and ensure the pilot hole diameter matches the recommended drill size for 10-24 UNC threads. Apply a suitable cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread finish. When using in a blind hole, clear chips frequently to prevent tap breakage.