Value Collection MSC-04439287 Straight Flute Tap 12-28 Unf

Product Description

The VALUE COLLECTION MSC-04439287 is a straight flute tap designed for cutting 12-28 UNF internal threads in a variety of workpiece materials. It features four flutes and a plug chamfer, making it suited for through-hole and moderate-depth blind-hole threading applications. Constructed from high-speed steel with a bright, uncoated finish, this tap offers reliable cutting performance and durability in standard threading operations. The H3 thread limit designation ensures the tap produces threads within 2B and 3B class of fit tolerances, which are the most common fits specified for general-purpose fastener assemblies in machined components.

This tap is used in machine shop, maintenance, and production environments where UNF threads are required. The plug chamfer — typically 3 to 5 threads of taper — allows the tap to start easily in a pre-drilled hole and cut to full thread depth efficiently. The right-hand thread geometry is standard for conventional fastener applications. It is typically run in drill presses, tapping machines, or CNC machining centers with appropriate tapping fluids, and is also suitable for hand tapping operations in repair and fabrication work.

Key Features

• 12-28 UNF thread size with H3 thread limit for 2B and 3B class of fit production
• Four straight flutes for controlled chip formation in a range of materials
• Plug chamfer style for easy starting in through-holes and moderate-depth blind holes
• High-speed steel construction provides durability across standard threading operations
• Bright, uncoated finish — compatible with a wide variety of cutting fluids and tapping compounds
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed as a standard replacement or additional tap for any application requiring 12-28 UNF internal threads with a 2B or 3B class of fit.

Installation Notes

Installation is performed by machinists or maintenance technicians using a tap wrench, tapping head, or machine spindle. Ensure the workpiece is properly secured and the pilot hole is drilled to the correct tap drill diameter for a 12-28 UNF thread before beginning. Apply an appropriate cutting fluid or tapping compound to extend tool life and improve thread quality. Back the tap out periodically during hand tapping to break chips and prevent binding.