Osg 2867400 Thread Forming Tap 1/2-13 Unc Bottoming Hss

Product Description

The OSG 2867400 is a thread forming tap designed for bottoming applications in blind holes requiring a 1/2-13 UNC thread form with a 2B class of fit. Unlike cutting taps, thread forming taps displace material rather than cutting it, producing stronger threads with no chips to clear from the hole. Manufactured from high-speed steel with a bright finish, this tap measures 3.375 inches in overall length and carries a 1.5 to 2 thread bottoming chamfer. It is suited for use by machinists, maintenance technicians, and tool-room professionals working with ferrous and non-ferrous materials in production or repair settings.

The OSG 2867400 is rated for threading aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It is specifically designed for blind hole threading, making it a practical choice for applications where a through-hole is not possible and full thread depth near the bottom of the bore is required. Right-hand thread direction and a shank diameter of 0.367 inches make it compatible with standard tap holders and chucks used in CNC and manual tapping operations.

Key Features

• Thread forming design displaces material for stronger, chip-free threads
• Bottoming chamfer (1.5-2P) allows full thread depth in blind holes
• High-speed steel construction for durability across multiple applications
• Bright finish suitable for use with standard tapping fluids and coolants
• Right-hand, 1/2-13 UNC thread standard with 2B class of fit
• Rated for aluminum, cast aluminum, low-carbon steel, and medium-carbon steel

Compatibility

Designed for blind hole threading in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces requiring a 1/2-13 UNC, 2B class of fit thread form.

Installation Notes

This tap is intended for use by qualified machinists or maintenance technicians operating manual or CNC tapping equipment. Always ensure the workpiece is properly secured and the tap is aligned perpendicular to the bore before beginning the tapping cycle. Use an appropriate tapping fluid or cutting oil for the material being threaded to extend tool life and maintain thread quality. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.