Osg 1400120401 Thread Forming Tap 10-32 Unf Cobalt

Product Description

The OSG 1400120401 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads in blind holes without cutting. Unlike cut taps, thread forming taps displace material rather than remove chips, producing stronger threads with a burnished finish. Built from cobalt high-speed steel and finished with a steam oxide coating, this tap handles demanding materials including alloy steel, carbon steel, stainless steel, hardened steel, die steel, and aluminum. It is configured for 10-32 UNF threads with a modified bottoming chamfer of 2 to 2.5 chamfered threads, making it well suited for threading close to the bottom of blind holes. Licensed machinists and tool-and-die professionals are the primary users.

This tap is intended for blind hole threading in production and maintenance machining environments. The 10-32 UNF thread size is common in precision assemblies across aerospace, industrial equipment, and electronics manufacturing where fine-pitch threads are required in tight spaces. The modified bottoming chamfer allows threading nearer to the bottom of a blind hole compared to a standard plug chamfer. Material application codes P and N confirm suitability across a broad range of ferrous and non-ferrous workpiece materials.

Key Features

• Thread forming design displaces material rather than cutting chips, reducing breakage risk and improving thread strength
• Cobalt high-speed steel construction provides heat and wear resistance in tough materials including stainless and hardened steels
• Steam oxide coating improves lubricity and helps resist galling during the forming process
• Modified bottoming chamfer with 2 to 2.5 chamfered threads allows threading close to the bottom of blind holes
• Class 3B fit with H4 thread limit for tight, accurate thread tolerance
• Right-hand thread direction in 10-32 UNF for standard fastener compatibility

Compatibility

Designed for blind hole thread forming applications in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Part of the OSG HY-PRO NRT series 14001.

Installation Notes

Thread forming taps require a specific tap drill size calculated for forming, not cutting — consult OSG or a standard tap drill chart for the correct forming drill diameter for 10-32 UNF. Adequate lubrication or cutting fluid appropriate for the workpiece material is essential to prevent galling and tap failure. Secure the workpiece and use a calibrated torque-controlled tapping head or CNC spindle where possible to avoid overloading the tap. Always follow applicable shop safety procedures and ensure the spindle is fully stopped before handling the tap.