Osg 2841401 Spiral Point Tap 5/16-24 Unf 3 Flute Plug Hss

Product Description

The OSG 2841401 is a spiral point plug tap designed for threading 5/16-24 UNF right-hand threads in a wide range of ferrous and non-ferrous materials. Built from Vanadium High Speed Steel (HSS-E) with a steam oxide finish, this tap offers improved lubricity and chip evacuation compared to uncoated alternatives. The 3-flute spiral point geometry pushes chips forward ahead of the cutting zone, making it well suited for through-hole applications. Overall length is 2.72 inches with a thread length of 1.125 inches and a shank diameter of 0.318 inches. Thread limit is H7, providing a standard tolerance fit for most UNF fastener applications.

This tap is intended for production and maintenance threading work across machine shops, fabrication facilities, and field service environments. The 5/16-24 UNF thread form is commonly found in precision assemblies, automotive components, and structural hardware. The oxide coating helps reduce built-up edge when cutting aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, cast iron, and hardened steel. It is appropriate for use in vertical machining centers, drill presses, and hand tapping applications where through-hole access is available.

Key Features

• 3-flute spiral point geometry pushes chips forward for clean through-hole threading
• Vanadium High Speed Steel (HSS-E) construction for extended tool life in ferrous and non-ferrous materials
• Steam oxide coating reduces friction and minimizes built-up edge
• H7 thread limit for standard UNF tolerance fitment
• Right-hand cut, plug chamfer for general-purpose through-hole starting
• No coolant-through requirement — compatible with flood, mist, or manual lubrication

Compatibility

Designed for cutting 5/16-24 UNF right-hand threads in aluminum, hardened steel, stainless steel, high-carbon steel, low-carbon steel, medium-carbon steel, alloy steel, die steel, and cast iron. Not rated for interrupted-thread or blind-hole-primary applications without process verification.

Installation Notes

Installation is performed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC rigid tapping cycle. Always secure the workpiece and verify hole diameter matches the recommended tap drill size for 5/16-24 UNF before beginning. Apply cutting fluid appropriate to the workpiece material to extend tap life and reduce the risk of tap breakage. Follow applicable shop safety procedures and machine guarding requirements when power tapping.