Osg 1005113808 Straight Flute Tap 5/8-11 Unc Plug Chamfer

Product Description

The OSG 1005113808 is a straight flute tap designed for cutting 5/8-11 UNC right-hand internal threads in hardened steel and alloy steel. It features a 5-flute geometry with a plug chamfer for standard through-hole and blind-hole tapping applications. The V finish coating provides surface hardness suited to ferrous materials. With an overall length of 3.813 inches and a thread length of 1.091 inches, this tap fits standard hand-tap holders and machine tap adapters. The H6 thread limit designation ensures a controlled fit for medium-tolerance threaded assemblies common in structural and mechanical fabrication work.

This tap is used in machine shop, maintenance, and manufacturing environments where 5/8-11 UNC threaded holes are required in hardened or alloy steel workpieces. The plug chamfer style makes it appropriate for starting threads in through-holes or for continuation tapping after a taper tap. It is well suited for CNC tapping, drill press tapping, and hand tapping operations. The straight flute design keeps chips moving axially, which works best in through-hole applications or short blind holes where chip evacuation is manageable.

Key Features

• 5/8-11 UNC right-hand thread form for standard unified coarse thread applications
• 5-flute straight flute design promotes rigidity and consistent thread form in ferrous materials
• Plug chamfer provides 3 to 5 chamfered threads for moderate entry and versatile use in through-holes
• H6 thread limit for controlled medium-tolerance fit in structural and mechanical assemblies
• V finish coating suited for tapping hardened steel and alloy steel workpieces
• No coolant-through requirement — compatible with flood coolant or cutting fluid applied externally

Compatibility

Designed for tapping 5/8-11 UNC threads in hardened steel and alloy steel. Compatible with standard tap holders and machine tap adapters accepting a 0.48-inch shank diameter with a 0.36-inch square drive.

Installation Notes

Installation is performed by a machinist or maintenance technician using a tap wrench, drill press tap attachment, or CNC tapping cycle. Always ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for 5/8-11 UNC before beginning the tapping operation. Apply appropriate cutting fluid for the material being tapped. Do not reverse the tap abruptly in hardened steel, as this increases the risk of tap breakage.