Osg 1013102 Straight Flute Tap 5-40 Unc Plug Hss

Product Description

The OSG 1013102 is a straight flute tap designed to cut internal threads in a wide range of metallic workpiece materials. Built from high-speed steel, this plug-chamfer tap produces 5-40 UNC right-hand threads and is rated for Class of Fit 2B and 3B applications. With 3 flutes and an H2 thread limit, it delivers controlled thread tolerances suitable for standard fastener fits in production and maintenance environments. The overall length is 1-15/16 inches, and the thread length is 5/8 inches. Machinists and tool-and-die professionals select this tap for its consistent performance on through-hole and shallow blind-hole threading operations.

This tap is suited for threading operations on aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The plug chamfer - with a 3 to 5 thread lead-in - makes it appropriate for through-hole applications and for starting threads in blind holes where adequate chip clearance is available. It fits standard tap wrench chucks and CNC rigid-tap holders sized for small-diameter taps. The 5-40 UNC thread form is widely used in instrument, electronics, and light mechanical assembly work.

Key Features

• 5-40 UNC right-hand thread form for instrument and light assembly applications
• High-speed steel construction provides wear resistance across ferrous and non-ferrous materials
• Plug chamfer with 3-flute design balances chip evacuation and thread form quality
• H2 thread limit ensures consistent Class 2B and 3B fit tolerances
• Straight flute geometry is well-suited to through-hole and non-interrupted cuts
• Compact 1-15/16 inch overall length fits standard tap holders and wrench drives

Compatibility

Designed for use on aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. Compatible with standard tap wrenches and rigid-tapping tool holders sized for small-diameter taps producing 5-40 UNC threads.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping stand, or CNC rigid-tap cycle. Before tapping, the correct tap drill size for 5-40 UNC must be used to prepare the hole to the appropriate minor diameter. Apply cutting fluid rated for the workpiece material to extend tool life and improve thread finish. Never back-drive a tap under power without confirming the machine is set for rigid tapping with appropriate torque limits.