Osg 1136102 Straight Flute Tap 1-8 Unc Plug Hss

Product Description

The OSG 1136102 is a straight flute tap designed to cut right-hand internal threads to the 1-8 UNC standard. Built from high-speed steel, this plug chamfer tap produces clean, accurate threads in a wide range of ferrous and non-ferrous materials. It features 4 flutes, a thread limit of H4, and a 3B class of fit for standard tolerance applications. The overall length is 5.125 inches with a thread length of 2.5 inches. This tap is part of OSG Series 101 and is suited for through-hole and shallow blind-hole tapping operations performed by machinists and maintenance technicians.

The OSG 1136102 is intended for production and maintenance tapping in materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The plug chamfer, with its moderate lead-in, makes it a practical choice for general-purpose tapping in both through holes and blind holes where adequate chip clearance is present. It is commonly used in machine shop environments, repair facilities, and industrial maintenance settings.

Key Features

• 1-8 UNC right-hand thread form for standard unified coarse-thread applications
• High-speed steel construction provides durability across a range of workpiece materials
• 4-flute design with plug chamfer for general-purpose through and blind-hole tapping
• H4 thread limit for controlled tolerance fit in 3B class applications
• 2.5-inch thread length accommodates deeper tapping reach
• No coolant-through requirement simplifies setup on standard tapping machines and drill presses

Compatibility

Designed for use in materials including aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel where a 1-8 UNC, 3B class of fit internal thread is required.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using appropriate tapping fluid or cutting oil for the workpiece material. Secure the workpiece fully before beginning the tapping operation, and ensure the spindle or tapping attachment is properly aligned to avoid tap breakage. Follow applicable shop safety procedures and machine manufacturer guidelines when setting feed rates and spindle speeds. Inspect the tap for wear or chipping before each use and replace if thread quality degrades.