Osg 1734701 Spiral Point Tap 2-56 Unc Plug Hss

Product Description

The OSG 1734701 is a spiral point tap designed for cutting right-hand internal threads in a range of ferrous materials. Built from vanadium high speed steel (HSS-E) with a steam oxide coating, it produces a 2-56 UNC thread profile using a 2-flute, plug chamfer geometry. The plug chamfer provides a gradual lead-in, making it well suited for through-hole tapping applications where the tap can push chips forward ahead of the cutting edge. Overall length is 1.752 inches, thread length is 0.437 inches (7/16 inches), and shank diameter is 0.141 inches. Thread limit is H3, indicating a standard tolerance class for general-purpose UNC threading.

This tap is intended for use in through-hole tapping operations on hardened steel, low-carbon steel, medium-carbon steel, and stainless steel. The 2-56 UNC thread size is common in precision instrument work, electronics, and small mechanical assemblies. The steam oxide finish provides a degree of lubricity and mild corrosion resistance during operation, which is particularly useful when tapping stainless steel or working without flood coolant. Coolant-through capability is not available on this tap.

Key Features

• 2-56 UNC right-hand thread form, H3 tolerance class for consistent fit
• Vanadium high speed steel (HSS-E) construction for improved wear resistance over standard HSS
• Steam oxide coating adds lubricity and mild corrosion resistance
• Plug chamfer geometry pushes chips forward, suited for through-hole tapping
• 2-flute design keeps tool diameter minimal for small thread sizes
• No interrupted thread or oversize profile - standard OEM-style replacement geometry

Compatibility

Designed for through-hole tapping of 2-56 UNC threads in hardened steel, low-carbon steel, medium-carbon steel, and stainless steel workpieces.

Installation Notes

This tap is installed by machinists or precision assembly technicians using a standard tap wrench or CNC tapping cycle. Always secure the workpiece before tapping and ensure the starter hole is drilled to the correct tap drill diameter for a 2-56 UNC thread. Apply appropriate cutting fluid, especially when tapping stainless steel, to reduce heat and extend tool life. Do not reverse the tap aggressively when breaking chips - back off smoothly to avoid tap breakage in small-diameter threads.