Value Collection MSC-04474219 Straight Flute Tap 1/2-20 Unf

Product Description

The VALUE COLLECTION MSC-04474219 is a straight flute bottoming tap designed to cut 1/2-20 UNF internal threads in through-holes and blind holes where full thread depth close to the bottom is required. Built from high-speed steel with a bright, uncoated finish, it runs 4 flutes in a right-hand thread direction and carries a 3B class of fit with an H3 thread limit. Overall length is 3.375 inches, with a thread length of 1.656 inches. Machinists, toolroom technicians, and maintenance professionals use this tap for precision threading in ferrous and non-ferrous workpieces where tight tolerances are critical.

This bottoming tap is suited for applications where thread engagement must extend to the bottom of a blind hole, such as fixture plates, machine components, and structural assemblies. The 1/2-20 UNF thread form is common in precision mechanical assemblies across industrial, automotive, and general manufacturing environments. The H3 thread limit accommodates standard tolerances for 3B fit without requiring additional finishing operations after tapping.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• 1/2-20 UNF thread form with 3B class of fit and H3 thread limit for precision tolerance control
• 4-flute straight design for stable cutting in shorter-chipping materials
• High-speed steel construction for durability across a range of workpiece materials
• Bright, uncoated finish — no additional coating variables affecting thread tolerance
• Right-hand thread direction for standard tap wrench or machine tapping operations

Compatibility

Designed as an OEM-style straight flute bottoming tap suitable for use with standard 1/2-20 UNF thread applications in general machining and maintenance tapping operations.

Installation Notes

This tap is installed by machinists or maintenance technicians using a tap wrench, tapping head, or CNC machining center with appropriate spindle speed for the workpiece material. Ensure the tap is properly aligned with the pilot hole before engagement to prevent cross-threading or tap breakage. Apply a suitable cutting fluid for the workpiece material to reduce heat and extend tap life. Do not force the tap if resistance increases unexpectedly — back off to clear chips before continuing.