Import BDNA-20735 Straight Flute Tap 10-24 Unc Bottoming Hss

Product Description

The IMPORT BDNA-20735 is a straight flute bottoming tap designed for cutting internal threads in pre-drilled holes where full thread depth close to the bottom of a blind hole is required. Built from high-speed steel (HSS) with a gold oxide coating, this tap offers added lubricity and mild corrosion resistance during threading operations. It cuts a 10-24 UNC right-hand thread with 4 flutes and carries a Thread Limit of H3, indicating a standard tolerance class suited for general-purpose tapping in ferrous and non-ferrous materials. Machinists, maintenance technicians, and fabricators reach for this style of tap when a plug or taper tap cannot achieve sufficient thread depth.

This tap is used in machine shops, maintenance and repair operations, and light fabrication environments. The bottoming chamfer — typically 1 to 2 thread lead — allows threading to within a few turns of the bottom of a blind hole, making it the finishing tap in a standard plug-then-bottom sequence. It is suitable for use in drill presses, CNC machines, and hand-tapping fixtures across a wide range of ferrous and non-ferrous base materials.

Key Features

• 10-24 UNC thread form with right-hand cutting direction
• Bottoming chamfer for threading close to the bottom of blind holes
• High-speed steel construction for durability across common workpiece materials
• Gold oxide coating provides lubricity and mild corrosion resistance
• 4 straight flutes for chip clearance in through and shallow blind holes
• H3 thread limit for standard general-purpose tolerance applications

Compatibility

Designed as an OEM-style replacement or standard addition to tooling inventories requiring 10-24 UNC bottoming taps in high-speed steel.

Installation Notes

Tapping operations should be performed by a machinist or qualified technician following established shop-safety procedures. Secure the workpiece firmly before tapping and apply appropriate cutting fluid to extend tool life and improve thread quality. When hand-tapping, advance the tap incrementally and back off periodically to break chips. Inspect the tap for wear or chipping before each use and replace if cutting edges are damaged.