Osg 1061300 Straight Flute Tap 4-40 Unc Plug Hss

Product Description

The OSG 1061300 is a straight flute tap designed to cut internal 4-40 UNC threads in a wide range of ferrous and non-ferrous materials. It features a plug chamfer style, 2 flutes, and a bright uncoated high-speed steel construction. With an overall length of 1-7/8 inches and a thread length of 9/16 inches, this tap is sized for standard small-fastener tapping operations common in precision machining, toolroom work, and production environments. The H1 thread limit designation indicates tight tolerance control for consistent thread quality. Right-hand thread direction is standard for conventional tapping setups.

This tap is suited for tapping 4-40 UNC threads in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. It is a solid choice for machinists, maintenance technicians, and toolroom professionals working with small-diameter threaded holes in light manufacturing, instrument assembly, and general metalworking applications. The straight flute design performs reliably in through-hole and short blind-hole tapping where chip management is not a limiting factor.

Key Features

• 4-40 UNC thread form with right-hand thread direction
• Plug chamfer for general-purpose through-hole and blind-hole entry
• 2-flute straight flute geometry suited to a broad range of metals
• High-speed steel construction with bright uncoated finish
• H1 thread limit for tight, consistent thread tolerance
• Shank diameter of 0.141 inches fits standard tap holders and chucks

Compatibility

Designed as a standard 4-40 UNC straight flute tap compatible with conventional tap handles, tapping heads, and CNC tap holders accepting a 0.141-inch shank diameter. Suitable for use across the material applications listed in the specifications.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping operations. Ensure the workpiece is securely fixtured and the correct tap drill size for 4-40 UNC is used prior to tapping. Apply appropriate cutting fluid for the material being tapped to extend tool life and improve thread quality. Do not force the tap if resistance increases unexpectedly, as this can cause breakage in small-diameter taps.