Osg 1400104500 Thread Forming Tap 3-56 Unf Cobalt

Product Description

The OSG 1400104500 is a thread forming tap in the HY-PRO NRT series, designed for 3-56 UNF right-hand internal threads in blind hole applications. Unlike cutting taps, thread forming taps displace material rather than cut it, producing stronger threads with no chips to clear from the hole. Built from cobalt high-speed steel with a bright finish, this tap handles a broad range of workpiece materials. It features a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing thread forming close to the bottom of a blind hole. Overall length is 1.813 inches with a thread limit of H4. Installed by machinists and tool and die technicians in precision manufacturing environments.

This tap is suited for threading blind holes in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The modified bottoming chamfer makes it a practical choice when full thread depth near the bottom of a shallow blind hole is required. The HY-PRO NRT series is a recognized OSG product line for thread forming in ferrous and non-ferrous metals across production and maintenance machining operations. Material application codes P and N confirm suitability for steel and non-ferrous material groups.

Key Features

• Thread forming design displaces material for chip-free, stronger threads in blind holes
• Modified bottoming chamfer with 2 to 2.5 chamfered threads for threading close to hole bottom
• Cobalt high-speed steel construction for heat and wear resistance in hard materials including hardened steel and stainless steel
• H4 thread limit for consistent fit tolerance in 3-56 UNF applications
• Bright finish with no additional coating, suitable for use with standard tapping fluids
• Right-hand thread direction, compatible with standard tapping equipment

Compatibility

Designed for blind hole thread forming in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum workpieces requiring 3-56 UNF internal threads. Material application codes P and N apply.

Installation Notes

Thread forming taps require a properly sized forming hole diameter — consult the OSG HY-PRO NRT series forming drill chart for the correct pre-drill size for 3-56 UNF. Use an appropriate tapping fluid or cutting oil matched to the workpiece material. Secure the workpiece and align the tap perpendicular to the hole before applying torque to avoid tap breakage in small-diameter applications. This tool is typically operated by machinists using a tapping head, CNC machine, or hand tap wrench at controlled speed and feed.