Value Collection BDNA-20662 Spiral Point Tap 3/8-16 Unc

Product Description

The VALUE COLLECTION BDNA-20662 is a spiral point plug tap designed for cutting right-hand internal threads in through-hole applications. Built from high speed steel (HSS) with a bright uncoated finish, this tap features three flutes and a plug chamfer that progressively engages the workpiece, pushing chips forward through the hole rather than packing them behind the cutting edge. The H3 thread limit designates a standard tolerance class suited for general-purpose threading where consistent fit and dimensional accuracy are required. It is sized for 3/8-16 UNC threads, one of the most common unified coarse thread specifications used in North American fastening applications.

This tap is used in machine shop, maintenance, and field-service applications wherever 3/8-16 UNC through-holes need to be threaded in ferrous and non-ferrous materials. It is appropriate for use in drill presses, CNC machining centers, tapping machines, or hand-held power tools equipped with a proper tap holder. Typical users include machinists, tool-and-die technicians, millwrights, and industrial maintenance professionals working with steel, aluminum, and similar machinable materials.

Key Features

• 3/8-16 UNC thread size for standard coarse-thread through-hole applications
• Spiral point design pushes chips forward, reducing chip packing in through-holes
• 3-flute geometry provides a balance of chip clearance and cutting edge strength
• Plug chamfer allows progressive thread engagement for machine or hand tapping
• High speed steel construction offers durability across a range of machinable materials
• H3 thread limit ensures consistent tolerance for general-purpose thread fits

Compatibility

Designed as a general-purpose spiral point plug tap for 3/8-16 UNC through-hole threading. Compatible with standard tap holders and chucks sized for this shank diameter in tapping machines, drill presses, and CNC equipment.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with tapping operations and applicable shop safety practices. Ensure the workpiece is securely clamped and the pilot hole is drilled to the correct tap drill diameter for 3/8-16 UNC before threading. Use appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Never force a tap that has stopped turning freely, as this can result in tap breakage in the workpiece.