Osg 1195700 Straight Flute Tap 5/16-18 Unc Plug Hss

Product Description

The OSG 1195700 is a straight flute tap designed for cutting 5/16-18 UNC internal threads in a wide range of metals. Manufactured from high-speed steel with a bright, uncoated finish, it features 2 flutes and a plug chamfer for general-purpose through-hole and blind-hole tapping. The H3 thread limit ensures consistent thread tolerance control to a 3B class of fit. With an overall length of 2-23/32 inches and a thread length of 1-1/8 inches, this tap is suited for production and maintenance work performed by machinists, tool-and-die workers, and maintenance technicians.

This tap is intended for right-hand thread applications in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The plug chamfer - typically 3 to 5 threads of taper - makes it the standard choice for starting threads in a pre-drilled hole and carrying them to depth, whether in a CNC machining center, drill press, or hand-tapping setup. It is sold individually and carries a minimum order quantity of 1.

Key Features

• 5/16-18 UNC thread form with right-hand direction and 3B class of fit
• H3 thread limit for consistent oversize tolerance control
• 2-flute straight flute geometry suited for through-hole and short blind-hole applications
• Plug chamfer provides easy thread starting with moderate lead-in
• High-speed steel construction offers durability across ferrous and non-ferrous materials
• Bright, uncoated finish - compatible with standard cutting fluids and oils

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 5/16-18 UNC, 3B class of fit, plug-chamfer straight flute tap. Rated for use in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel.

Installation Notes

Always use the correct tap drill size for 5/16-18 UNC threads before tapping to avoid tool breakage. Power down or disengage the spindle before changing or inspecting taps in any machine setup. Apply appropriate cutting fluid for the workpiece material - particularly when tapping steel or cast iron. Follow applicable shop safety procedures and machine guarding requirements during all tapping operations.