Value Collection MSC-04481180 Straight Flute Tap 5/16-18 Unc

Product Description

The VALUE COLLECTION MSC-04481180 is a straight flute plug tap designed for cutting internal right-hand threads in through-holes and shallow blind holes. Built from high-speed steel with a bright, uncoated finish, it cuts 5/16-18 UNC threads to a 2B class of fit with an H5 thread limit. The plug chamfer — typically 3 to 5 threads — provides a balance between starting ease and thread engagement depth, making this tap a reliable choice for general-purpose machine shop and maintenance work. With a 1-inch thread length and an overall length of 2-23/32 inches, it fits standard tap wrenches and tapping heads used in manual and light CNC operations.

This tap is suited for production and repair threading in ferrous and non-ferrous materials where a standard 2B class of fit is specified. It is commonly used by machinists, maintenance technicians, and tool-room operators in applications ranging from fixture fabrication to field repair. The 4-flute straight design works well in materials that produce broken or powdery chips, such as cast iron, brass, and free-machining steel.

Key Features

• 5/16-18 UNC thread form with 2B class of fit and H5 thread limit for standard tolerance applications
• Plug chamfer (approximately 3-5 lead threads) for easy starting in through-holes and shallow blind holes
• 4 straight flutes provide chip clearance in materials that produce brittle or broken chips
• High-speed steel construction offers toughness and edge retention across a range of common workpiece materials
• Bright uncoated finish — no coating buildup to affect thread tolerance; compatible with most cutting fluids
• Right-hand thread direction; no coolant-through feature (external flood or manual lubrication required)

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 5/16-18 UNC straight flute plug tap in standard 2B fit. Fits standard tap wrench collets and tapping head adapters sized for this shank.

Installation Notes

Secure the workpiece firmly before tapping to prevent movement during thread cutting. Apply appropriate cutting fluid or tapping compound for the material being threaded — dry tapping in steel will reduce tool life significantly. Back the tap off periodically to break and clear chips when hand-tapping. Follow applicable shop safety standards and ensure the tap is properly aligned to avoid crooked or torn threads.