Eagle Cutting Tool HT-3125-24-B-D 5/16-24 Hss Hand Tap

Product Description

The EAGLE CUTTING TOOL HT-3125-24-B-D is a 5/16-24 high-speed steel (HSS) hand bottom tap designed for cutting internal threads in through-holes and blind holes where threads must extend close to the bottom. The bottom chamfer style — typically 1 to 2 threads of chamfer lead — allows threading to within a few threads of the bottom of a blind hole, making it the go-to choice when a plug or taper tap cannot finish the job. Licensed tradespeople and machinists reach for this tap when a job calls for full thread depth right down to the base of the hole.

This tap is suited for use in machine shops, maintenance facilities, and fabrication environments where 5/16-24 UNF thread specifications are required. The 5/16-24 designation indicates a 5/16-inch nominal diameter with 24 threads per inch, a fine-thread pitch commonly used in precision mechanical assemblies, automotive components, and structural hardware. It is appropriate for use in steel, aluminum, brass, and similar materials when used with proper cutting fluid and correct drill sizing.

Key Features

• Bottom chamfer style allows threading to near the base of blind holes
• 5/16-24 UNF fine-thread profile for precision thread applications
• High-speed steel (HSS) construction provides hardness and wear resistance
• Hand tap design compatible with standard tap handles and wrenches
• Lightweight at 0.06 pounds for easy single-hand use

Compatibility

Designed as an OEM-style replacement or standard hand tap for use in any application requiring 5/16-24 UNF internal threads in ferrous and non-ferrous materials.

Installation Notes

This tap is installed by machinists, maintenance mechanics, and tradespeople using a standard tap handle or T-handle wrench. Always start with the correctly sized tap drill for 5/16-24 threads and secure the workpiece before tapping. Use a cutting fluid or tapping compound appropriate for the base material to reduce heat and extend tap life. Back off the tap periodically to break chips and prevent binding, especially in deep blind holes.

Technical Specifications

• Thread Size: 5/16-24 UNF
• Tap Style: Bottom (Bottoming)
• Material: High-Speed Steel (HSS)
• Operation Type: Hand Tap
• Weight: 0.06 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-3125-24-B-D