Osg 1101501305 Spiral Point Tap 8-32 Unc Tin Hss

Product Description

The OSG 1101501305 is a spiral point plug tap designed for cutting 8-32 UNC internal threads in a wide range of ferrous and non-ferrous materials. Manufactured from vanadium high-speed steel (HSS) with a titanium nitride (TiN) coating, this tap offers increased surface hardness and lubricity for extended tool life compared to uncoated HSS. It features 3 flutes in a plug chamfer configuration, which distributes the cutting load over several threads for smooth entry and consistent thread formation. The overall length is 2.125 inches, with a thread length of 0.437 inches and a shank diameter of 0.168 inches. This tap carries an H7 thread limit designation, indicating a controlled oversize tolerance suited to applications requiring standard fit class threading. Machinists, maintenance technicians, and toolroom professionals install this tap in both manual and CNC tapping operations.

This tap is suited for through-hole and blind-hole threading in general manufacturing, maintenance, and repair applications. The spiral point geometry pushes chips forward ahead of the tap, making it well-suited for through-hole tapping. Compatible material applications include aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, cast iron, stainless steel, hardened steel, high-nickel alloy, and titanium. It is appropriate for production environments and job shop use where consistent 8-32 UNC thread quality is required across varied workpiece materials.

Key Features

• 8-32 UNC thread form with H7 thread limit for controlled oversize fit
• Spiral point geometry advances chips forward, ideal for through-hole tapping
• 3-flute plug chamfer distributes cutting load for smooth thread entry
• TiN coating increases surface hardness and reduces friction for longer tool life
• Vanadium high-speed steel construction handles a broad range of workpiece materials
• Right-hand thread direction; no coolant-through required

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap for 8-32 UNC threaded hole applications across general machining and maintenance operations. Part of OSG Series 11015.

Installation Notes

This tap is installed by machinists or maintenance technicians using a standard tap wrench, tapping head, or CNC rigid tapping cycle. Always secure the workpiece firmly and align the tap perpendicular to the hole before beginning. Apply appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Reverse the tap periodically in manual operations to break chips and prevent tap binding.