Osg 1400130905 Thread Forming Tap 5/16-18 Unc Cobalt Tin

Product Description

The OSG 1400130905 is a thread forming tap in the HY-PRO NRT series, designed to cut 5/16-18 UNC internal threads in blind holes without producing chips. It uses a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing the tap to work close to the bottom of a blind hole. Manufactured from cobalt high-speed steel and finished with a titanium nitride (TiN) coating, it carries an H7 thread limit. Overall length is 2.719 inches with a thread length of 0.665 inches and a tapping depth of 1.126 inches. This tap is suited for use in production and maintenance environments where clean, strong threads in blind bores are required.

The 1400130905 is designed for blind hole threading in a range of materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. Its right-hand thread direction and modified bottoming chamfer make it well-suited for applications where thread engagement close to the hole bottom is critical. Machinists and tool and die makers working on precision components will find this tap appropriate for both CNC and manual tapping operations in shop and field settings.

Key Features

• Modified bottoming chamfer with 2 to 2.5 chamfered threads for threading close to blind hole bottoms
• Cobalt high-speed steel construction for increased heat and wear resistance
• TiN coating reduces friction and extends tool life in ferrous and non-ferrous materials
• H7 thread limit for consistent fit and dimensional accuracy
• Chip-free thread forming process eliminates chip removal concerns in blind bores
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. Material application codes P and N apply. Part of the OSG HY-PRO NRT Series 14001.

Installation Notes

Thread forming taps are installed by machinists or toolroom technicians using tapping attachments, CNC machines, or hand tap wrenches with appropriate torque control. Ensure the workpiece is securely fixtured and the tap is properly aligned with the pilot hole before engagement. Use a tapping fluid or cutting oil compatible with the workpiece material to reduce heat buildup and extend tool life. Follow OSHA and shop safety guidelines when operating rotating equipment.