Import BDNA-20772 Straight Flute Tap 1/4-28 Unf Hss

Product Description

The IMPORT BDNA-20772 is a straight flute tap designed to cut 1/4-28 UNF internal threads in a wide range of materials. It features a taper chamfer, which eases the tool into the workpiece gradually and is well suited for through-hole applications. Manufactured from high-speed steel (HSS) with a gold oxide coating, this tap offers improved lubricity and corrosion resistance during cutting operations. With four flutes and an H3 thread limit, it produces consistent, accurate threads within standard tolerance requirements. Machinists, maintenance technicians, and trade professionals use this tap for threading operations in metalworking and general fabrication tasks.

This tap is appropriate for both manual hand-tapping and machine-tapping operations where a 1/4-28 UNF right-hand thread is required. The taper chamfer style — typically featuring 8 to 10 threads of lead — makes it the standard choice for starting a thread in a through-hole or open-bottom application. Common use cases include threading bolt holes in metal fixtures, HVAC equipment housings, plumbing brackets, and general mechanical assemblies requiring fine-thread fastening.

Key Features

• 1/4-28 UNF thread size with right-hand thread direction for standard fastener compatibility
• Taper chamfer style for gradual thread engagement, ideal for through-hole applications
• High-speed steel construction provides durability across a range of workpiece materials
• Gold oxide coating reduces friction and improves tool life during cutting
• H3 thread limit ensures consistent fit within standard UNF tolerance class
• 4-flute design for chip clearance and stable cutting action

Compatibility

Designed as an OEM-style replacement or standard cutting tool for any application requiring a 1/4-28 UNF straight flute taper tap in high-speed steel.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench for hand tapping or a tapping head on a drill press or CNC machine. Always use appropriate cutting fluid to reduce heat and extend tool life. Ensure the workpiece is securely clamped before beginning the threading operation. Reverse the tap periodically during hand tapping to break chips and prevent binding or breakage.