Osg 1604707 Straight Flute Tap 5/8-11 Unc Plug Hss

Product Description

The OSG 1604707 is a straight flute tap designed to cut 5/8-11 UNC internal threads in aluminum and cast iron workpieces. It features a plug chamfer for general-purpose through-hole and blind-hole threading applications. Manufactured from high-speed steel (HSS) with a nitride/oxide coating, the tap resists wear and mild heat buildup during cutting. The H5 thread limit provides controlled oversize tolerance suited for standard 2B class of fit assemblies. With 4 straight flutes and a right-hand thread direction, it delivers clean chip ejection in short-chipping materials commonly encountered in machining and fabrication environments.

This tap is suited for production and maintenance machining operations involving aluminum and cast iron components. The plug chamfer makes it appropriate for starting threads in a drill press, CNC tapping center, or manual tapping setup. The 2B class of fit accommodates standard fastener engagement without requiring precision-ground tolerances, making it a practical choice for general mechanical assembly, fixture building, and equipment repair work performed by machinists and maintenance tradespeople.

Key Features

• 5/8-11 UNC thread form with right-hand direction for standard inch-series fastener compatibility
• Plug chamfer for versatile use in through-holes and sufficiently deep blind holes
• High-speed steel construction provides toughness and re-sharpenability
• Nitride/oxide coating reduces friction and extends tool life in aluminum and cast iron
• H5 thread limit maintains consistent 2B class of fit tolerance
• 4 straight flutes promote chip clearing in short-chipping materials

Compatibility

Designed for threading aluminum and cast iron workpieces requiring 5/8-11 UNC, 2B class of fit internal threads; fits standard tap holders and tapping chucks accepting a 0.48-inch shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using a properly sized tap wrench, drill press, or CNC tapping center. Ensure the tap is aligned perpendicular to the workpiece before engaging threads to prevent cross-threading or tap breakage. Use an appropriate cutting fluid for the material being tapped, particularly with aluminum. Remove chips frequently during hand tapping to prevent binding and tool failure.