Osg 1604307 Straight Flute Tap 3/4-10 Unc Hss Plug

Product Description

The OSG 1604307 is a straight flute plug tap designed for cutting right-hand internal threads to a 3/4-10 UNC specification. Built from high-speed steel with a nitride and oxide combination coating, this tap is suited for production threading in ferrous and non-ferrous materials. The plug chamfer - typically 3 to 5 threads - makes it the standard choice for through-hole threading where partial thread lead-in is acceptable. With an H3 thread limit and 4 flutes, it delivers controlled fit tolerances and stable chip evacuation in moderate-duty tapping operations. Licensed machinists, toolroom techs, and maintenance mechanics are the primary users.

This tap is rated for threading aluminum and cast iron and fits standard tapping chucks and hand-tap wrenches accepting the 0.442-inch square drive. The 101C series designation places it within OSG's general-purpose straight flute line. At 4.25 inches overall length with a 2-inch thread length and a neck length of 2.22 inches, it has sufficient reach for most through-hole and shallow blind-hole applications in those material classes.

Key Features

• 3/4-10 UNC right-hand thread form for standard unified coarse series fastener preparation
• H3 thread limit for controlled tolerance fits in production and maintenance threading
• High-speed steel construction provides toughness across a range of cutting speeds
• Nitride and oxide coating reduces friction and improves surface lubricity during cutting
• 4-flute straight design aids chip control in through-hole tapping of aluminum and cast iron
• Plug chamfer style suits through-hole applications requiring moderate lead-in

Compatibility

Rated for use in aluminum and cast iron. Fits standard tapping holders and hand-tap wrenches sized for a 0.442-inch square drive shank.

Installation Notes

Always secure the workpiece and use appropriate cutting fluid for the material being tapped - sulfur-based oils for cast iron and light lubricants or cutting fluid for aluminum. Align the tap perpendicular to the work surface before starting to avoid thread cross-threading or tap breakage. Use a calibrated tapping chuck or T-handle tap wrench matched to the square drive size. Remove the tap periodically to clear chips when working in deeper holes.