Import BDNA-20778 Straight Flute Tap 5/8-18 Unf Hss

Product Description

The IMPORT BDNA-20778 is a straight flute tap designed for cutting internal threads in a 5/8-18 UNF thread form. Built from high-speed steel with a gold oxide coating, this tap delivers consistent thread quality in ferrous and non-ferrous materials across general machining and maintenance applications. The taper chamfer style eases entry into the workpiece, making it well suited for through-hole threading operations. With 4 flutes and a right-hand thread direction, it produces clean, accurate threads to an H3 thread limit tolerance, which keeps fits within standard UNF tolerance ranges.

This tap is used in metalworking shops, maintenance and repair operations, and field service environments where 5/8-18 UNF threaded holes are required. The taper chamfer makes it appropriate as a starting tap or for use in through holes where chip clearance is managed progressively. It is sold individually and is a practical choice for low-volume threading tasks or replacement of a worn tap in an existing set.

Key Features

• 5/8-18 UNF thread form for standard unified fine-pitch applications
• Taper chamfer for progressive thread engagement and easier starting
• 4 straight flutes for reliable chip evacuation in through-hole applications
• High-speed steel construction provides good wear resistance across common metals
• Gold oxide coating reduces friction and provides light corrosion protection
• H3 thread limit ensures threads fall within standard UNF tolerance for consistent fit
• Right-hand thread direction matches standard fastener orientation

Compatibility

Designed as an OEM-style replacement or general-use straight flute tap for any application requiring a 5/8-18 UNF internal thread in through-hole configurations.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tap wrench or tapping head rated for the workpiece material. Secure the workpiece firmly before tapping and apply cutting fluid appropriate for the base material to extend tool life and improve thread finish. Inspect the tap for wear or chipping before each use and replace if the cutting edges show damage to avoid thread quality issues.