Osg 1012800 Straight Flute Tap 4-36 Uns Hss Plug

Product Description

The OSG 1012800 is a straight flute plug tap ground to 4-36 UNS thread form in high-speed steel with a bright, uncoated finish. It carries three flutes and an H2 thread limit, making it well suited for threading through-holes in a wide range of ferrous and non-ferrous workpiece materials. Overall length is 1-7/8 inches with a 9/16-inch thread length, a 0.141-inch shank diameter, and a square length of 0.1875 inches. Right-hand thread direction is standard. Machinists, tool and die makers, and maintenance technicians reach for this tap when producing or restoring UNS threads in production or repair settings.

This tap is designed for use in tapping operations on aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The plug chamfer makes it appropriate for through-hole applications where the tap can run past the bottom of the required thread. The straight flute geometry works reliably in shorter-chipping materials and in applications where coolant-through tooling is not required or available. It fits standard tap holders sized for the 0.141-inch shank.

Key Features

• 4-36 UNS thread form, right-hand direction, H2 thread limit for close tolerance fits
• Three straight flutes for reliable chip handling in short-chipping materials
• Plug chamfer geometry suited to through-hole tapping applications
• High-speed steel construction with bright, uncoated finish
• Coolant-through not required, simplifying use in manual or low-coolant setups
• Compact overall length of 1-7/8 inches fits standard tap holders and tight workpiece clearances

Compatibility

Designed as an OEM-style straight flute plug tap for use in standard tap holders accepting a 0.141-inch shank diameter; compatible with aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpiece materials per OSG Series 102 specifications.

Installation Notes

This tap is installed and operated by a qualified machinist or maintenance technician using a standard tap wrench, tapping head, or CNC spindle set to right-hand rotation. Power down and de-energize any machine tool before changing or seating tooling. Verify correct pilot hole diameter for 4-36 UNS threads before tapping to avoid tap breakage. Do not reverse the tap under power without confirming the drive setup supports it.