Osg 1011002 Straight Flute Tap 2-56 Unc Plug Hss

Product Description

The OSG 1011002 is a straight flute tap designed for cutting internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel, it produces right-hand, 2-56 UNC threads with a 2B class of fit and H2 thread limit. The plug chamfer provides a gradual thread lead-in, making it well-suited for through-hole applications where chip evacuation is straightforward. With an overall length of 1.75 inches and a thread length of 0.4375 inches, this tap is sized for small-diameter work requiring precision thread form. Machinists and tool-and-die professionals reach for this tap when accuracy and material versatility are required in a compact size.

This tap is used in production and maintenance machining environments where 2-56 UNC threads are needed. It performs in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel, covering a broad range of typical shop and field applications. The straight flute geometry works best in through-hole conditions or short blind holes where chips can exit freely. It fits standard tap holders and is compatible with hand tapping as well as machine tapping setups operating at appropriate speeds for small-diameter HSS tooling.

Key Features

• 2-56 UNC thread form with 2B class of fit for standard tolerance internal threads
• High-speed steel construction provides hardness and wear resistance across a range of workpiece materials
• Plug chamfer with 3-5 thread lead-in eases entry and reduces tap breakage risk in through-hole applications
• H2 thread limit for consistent fit and gauge-able thread output
• Straight flute design supports chip clearance in through-hole and short blind-hole work
• Right-hand thread direction compatible with standard tap holders and tapping arms

Compatibility

Designed for use in standard tap holders and machine spindles accepting small-diameter straight-shank taps. Suitable for tapping 2-56 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.

Installation Notes

Tapping should be performed by a qualified machinist familiar with small-diameter tap handling, as 2-56 taps are susceptible to breakage under misalignment or excessive feed force. Secure the workpiece fully before tapping and ensure the tap is aligned axially with the drilled pilot hole. Apply appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. When machine tapping, set spindle speed conservatively for high-speed steel tooling at this diameter.