Osg 1136702 Straight Flute Tap 1-14 Uns 4 Flutes Plug Hss

Product Description

The OSG 1136702 is a straight flute tap designed for cutting internal threads in a range of ferrous and non-ferrous materials. It produces a 1-14 UNS right-hand thread with a 3B class of fit and an H4 thread limit, delivering consistent dimensional accuracy across production and maintenance applications. Built from high-speed steel, it offers the toughness needed for interrupted cuts and general-purpose tapping. The plug chamfer - with a lead of approximately 3 to 5 threads - makes it well suited for through-hole applications. Thread length is 2.5 inches, and the overall length is 5.125 inches. This tap is part of OSG Series 101 and is sized for use in 1-inch diameter threaded assemblies.

This tap is used in machine shop, maintenance, and fabrication environments where 1-14 UNS threads are specified. Applicable materials include aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is suited for production tapping on drill presses, CNC machining centers, and manual tapping operations where a rigid setup is maintained. Coolant-through capability is not supported on this tap, so flood or brush-applied cutting fluid should be used when tapping steel or cast iron.

Key Features

• 1-14 UNS thread form with 3B class of fit and H4 thread limit for consistent fit tolerance
• Plug chamfer lead for through-hole tapping applications
• 4 straight flutes for chip clearance in a variety of workpiece materials
• High-speed steel construction for toughness and regrindability
• Right-hand thread direction, standard for the majority of tapping operations
• 2.5-inch thread length and 5.125-inch overall length for reach into standard workpiece depths

Compatibility

Compatible with materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. Designed for use where 1-14 UNS thread specifications are required.

Installation Notes

This tap should be installed by a machinist or tooling professional in a rigid tap holder or floating-head tapping attachment to minimize the risk of tap breakage. Power down or lock out the machine before changing tooling. Use an appropriate cutting fluid for the workpiece material - sulfurized cutting oil is commonly specified for steel, while a water-soluble coolant or light oil is typical for aluminum. Inspect the tap for wear or chipping before each use, as a dull tap dramatically increases breakage risk in harder materials.