Osg 1232602 Spiral Point Tap 1/2-20 Unf Hss Elektralube

Product Description

The OSG 1232602 is a spiral point tap designed for threading 1/2-20 UNF internal threads in a wide range of metals. The spiral point geometry pushes chips forward ahead of the cutting zone, keeping the flutes clear and reducing the risk of chip packing in through-hole applications. Built from high-speed steel with an elektraLUBE dry-film coating, this tap delivers consistent thread quality across production runs without requiring flood coolant. It carries a plug chamfer with a 3B class of fit and H3 thread limit, making it a standard choice for precision threaded assemblies in machining, maintenance, and repair work.

This tap is suited for through-hole threading operations in a shop or field machining context. The 1/2-20 UNF thread form is common in automotive, aerospace, and general mechanical assembly applications. It is compatible with materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. Machinists and tool-and-die technicians will find the H3 oversize limit and 3B fit appropriate for standard tolerance threaded holes requiring reliable engagement.

Key Features

• Spiral point design pushes chips forward, ideal for through-hole tapping
• High-speed steel construction for durability across a broad range of workpiece materials
• elektraLUBE dry-film coating reduces friction and extends tool life without wet coolant
• Plug chamfer provides progressive cutting entry and good thread lead-in
• H3 thread limit and 3B class of fit meet standard precision requirements for threaded assemblies
• Right-hand thread direction, compatible with standard tapping heads and CNC toolholders

Compatibility

Designed for threading 1/2-20 UNF through-holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces. Coolant-through spindle connection is not required or supported by this tap.

Installation Notes

Install in a standard tapping chuck, rigid holder, or floating tap head appropriate for 1/2-20 UNF tooling. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter before tapping. Apply cutting oil or a compatible tapping fluid at the entry point even with the dry-film coating present, particularly in harder steels. Do not reverse-feed to break chips with this tap in blind holes, as the spiral point is intended for through-hole use.