Import BDNA-20712 Straight Flute Tap 5/8-11 Unc

Product Description

The IMPORT BDNA-20712 is a straight flute plug tap designed for cutting 5/8-11 UNC internal threads in through-holes and moderately deep blind holes. Built from high-speed steel (HSS) with a gold oxide coating, it provides solid wear resistance and lubricity during threading operations. The plug chamfer — typically 3 to 5 threads of lead — makes it the go-to choice for most general tapping applications where the tap can pass fully through or where a starter thread is set before finishing. Four flutes provide adequate chip clearance in a range of workpiece materials. Overall length is 3-13/16 inches. Machinists, toolroom technicians, and maintenance mechanics use this tap with standard tapping attachments, drill presses, CNC machines, or hand tap wrenches.

This tap is suited for threading operations in ferrous and non-ferrous metals, plastics, and similar machinable materials. The H3 thread limit designates a tolerance class that produces threads fitting standard UNC go/no-go gauge requirements and works well with most commercial fastener fits. The straight flute geometry means chips are pushed ahead of the tap, making it most effective in through-hole applications or with proper cutting fluid and chip-clearing intervals in blind holes.

Key Features

• 5/8-11 UNC thread form for standard unified coarse-pitch fastener compatibility
• High-speed steel construction for durability across a wide range of workpiece materials
• Gold oxide coating reduces friction and provides light corrosion resistance during storage and use
• Plug chamfer (3-5 lead threads) for general-purpose through-hole and starter-thread applications
• H3 thread limit for consistent tolerance fit with standard UNC fasteners
• Four straight flutes for reliable chip clearance in through-hole threading

Compatibility

Designed as a standard straight flute plug tap for use with any tap wrench, tapping head, or machine tapping attachment accepting 5/8-11 UNC tooling with a standard shank profile.

Installation Notes

Secure the workpiece firmly before tapping and use an appropriate cutting fluid for the material being threaded to extend tool life and improve thread quality. For hand tapping, use a calibrated tap wrench and back off a half turn periodically to break chips. When using power equipment, set torque limits appropriate to the machine and tap size to avoid breakage. Always inspect the tap for wear or chipping before use and discard any tap showing visible damage to the flutes or chamfer.