Osg 1592500 Straight Flute Tap 1/2-13 Unc Plug Hss

Product Description

The OSG 1592500 is a straight flute hand tap designed for cutting internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright uncoated finish, this tap handles 1/2-13 UNC threading with a plug chamfer, making it suitable for through-hole and deeper blind-hole applications where chip control is manageable. The 4-flute straight design provides rigidity and a clean thread form. With an overall length of 3.375 inches and a thread length of approximately 1.154 inches, the tool fits standard tap wrench and machine setups. The H11 thread limit designation indicates the tap produces slightly oversized threads, which accounts for material spring-back in certain alloys. This tap is typically installed by machinists, maintenance technicians, and tool-and-die professionals.

This tap is suited for threading operations in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. It is appropriate for general production and MRO applications where a standard 1/2-13 UNC thread is required. The plug chamfer — typically 3 to 5 threads of lead — makes this tap versatile for both through-hole and moderately deep blind-hole work. It belongs to OSG Series 101H and carries no coolant-through capability, making it best suited for hand tapping and conventional machine tapping with applied cutting fluid.

Key Features

• 1/2-13 UNC thread form with 13 threads per inch for standard fastener compatibility
• Plug chamfer provides a balanced lead suitable for through-holes and many blind-hole configurations
• High-speed steel construction delivers durability across a broad range of workpiece materials
• H11 thread limit with 0.005 inch oversize allowance accommodates material spring-back
• 4 straight flutes offer rigidity and consistent thread form in shorter-chipping materials
• Right-hand thread direction; no coolant-through — designed for external cutting fluid application

Compatibility

Designed for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces requiring a standard 1/2-13 UNC internal thread. Compatible with standard tap wrenches and machine tap holders accepting a 0.367-inch shank diameter.

Installation Notes

This tap should be installed by qualified machinists or maintenance technicians familiar with threading operations and tool holding practices. Secure the workpiece firmly and ensure the tap is properly aligned perpendicular to the bore before starting the cut to avoid tap breakage. Apply an appropriate cutting fluid for the workpiece material before and during tapping to extend tool life and improve thread finish. When using in a machine setup, verify the tap holder provides adequate float to prevent axial overloading.