Import BDNA-20753 Straight Flute Tap 8-36 Unf Hss

Product Description

The IMPORT BDNA-20753 is a straight flute plug tap designed to cut 8-36 UNF right-hand internal threads in through-holes and blind holes where chip clearance is not a primary concern. Manufactured from high-speed steel (HSS) with a gold oxide coating, this tap offers improved lubricity and mild corrosion resistance compared to uncoated HSS. It features 4 flutes and an H2 thread limit, which indicates a tight ground tolerance suitable for class 2B and close-tolerance threaded holes. Overall length is 2.125 inches. The plug chamfer — typically 3 to 5 threads — makes it the standard choice for most general-purpose tapping operations.

This tap is suited for use in machine shops, maintenance and repair operations, and field service environments where 8-36 UNF threaded holes are required in ferrous and non-ferrous materials. The straight flute design is best applied in materials that produce short, brittle chips, such as cast iron, brass, and free-machining steels. It can be driven by hand tap wrenches or in a machine tapping setup at controlled feed rates. Machinists, toolmakers, and maintenance technicians are the primary users of this tooling.

Key Features

• 8-36 UNF thread form, right-hand direction, H2 thread limit for close-tolerance fitment
• 4 straight flutes suited for short-chipping materials including brass, cast iron, and free-machining steel
• Plug chamfer (3-5 thread lead) for general-purpose through-hole and blind-hole tapping
• High-speed steel construction provides toughness across a broad range of workpiece materials
• Gold oxide coating improves surface lubricity and provides mild protection against corrosion
• 2.125-inch overall length fits standard tap wrenches and machine tap holders for size 8 taps

Compatibility

Designed as a general-purpose straight flute tap for cutting 8-36 UNF threads; compatible with standard tap wrenches, T-handle holders, and machine tap collets sized for number 8 taps.

Installation Notes

Always secure the workpiece before tapping and use an appropriate cutting fluid or tapping compound to extend tool life and improve thread quality. Ensure the tap is started perpendicular to the work surface to avoid cross-threading or tap breakage. For machine tapping, use a tapping head or floating holder to prevent axial overload. When tapping blind holes, periodically back the tap out to clear chips and prevent binding.