Osg 1121601 Straight Flute Tap 3/8-24 Unf Plug Hss Oxide

Product Description

The OSG 1121601 is a straight flute tap designed for cutting internal threads in a range of ferrous and non-ferrous materials. It produces a 3/8-24 UNF right-hand thread to a 3B class of fit with an H3 thread limit, making it suitable for applications that require a standard tolerance fit. The tap features 4 flutes, a plug chamfer for moderate starting ease, and is manufactured from high-speed steel with an oxide coating for improved chip evacuation and surface lubricity. Overall length is 2-15/16 inches with a thread length of 1-1/4 inches. Licensed machinists and toolroom technicians are the primary users of this tap.

The OSG 1121601 is suited for threading operations in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. The plug chamfer style makes it appropriate for through-hole and moderately deep blind-hole applications where a partial-thread lead-in is acceptable. It is commonly used in production machining, maintenance and repair operations, and manual tapping setups where a 3/8-24 UNF thread is required to a 3B tolerance class.

Key Features

• 3/8-24 UNF thread form with 3B class of fit and H3 thread limit for standard tolerance applications
• Plug chamfer provides a balanced lead-in suitable for through-holes and moderately deep blind holes
• 4-flute design promotes chip control during tapping operations
• High-speed steel construction provides durability across a broad range of workpiece materials
• Oxide coating reduces friction and improves chip flow without additional surface treatments
• Right-hand thread direction; no coolant-through feature

Compatibility

Compatible with aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. Designed as a standard replacement or working tap for any application requiring a 3/8-24 UNF internal thread to 3B class of fit.

Installation Notes

Tapping should be performed by a qualified machinist using a properly sized tap wrench, tapping head, or CNC machine set to the correct feed rate for the 24 TPI pitch. Always secure the workpiece and ensure the spindle is aligned perpendicular to the tapped surface before starting. Power down or disengage the machine before changing or inspecting tooling. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality.