Eagle Cutting Tool HT-16250-8-B-I Hss Hand Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-16250-8-B-I is a high-speed steel (HSS) hand bottom tap sized at 1-5/8 inches with an 8 threads per inch (TPI) pitch. Bottom taps are ground with minimal chamfer on the lead threads, allowing them to cut threads close to the bottom of a blind hole where other tap styles cannot reach. This tap is an import-grade tool intended for manual threading operations using a tap wrench or T-handle driver. Machinists, pipefitters, millwrights, and maintenance technicians use bottom taps as the finishing step in a three-tap sequence or as a standalone tool when threading through holes in steel, cast iron, and similar materials.

This tap is suited for hand-threading applications in repair, fabrication, and maintenance environments. The 1-5/8-8 UNC thread specification is commonly found in large-diameter fastener applications, heavy equipment, structural assemblies, and industrial machinery. It is appropriate for use in both shop and field settings where a power tap is impractical or unavailable.

Key Features

• Bottom tap geometry allows threading to the base of blind holes
• High-speed steel construction provides hardness and wear resistance suitable for threading ferrous metals
• 1-5/8 inch diameter with 8 TPI coarse thread pitch
• Designed for manual operation with a standard tap wrench or T-handle
• Import-grade tooling suited for maintenance, repair, and lower-frequency production use

Compatibility

Designed as an OEM-style hand tap for manual threading of 1-5/8-8 UNC thread forms in ferrous and compatible non-ferrous materials.

Installation Notes

This tap is intended for use by machinists, maintenance technicians, and qualified trade professionals performing manual threading operations. Always ensure the pilot hole is drilled to the correct tap drill diameter before threading, and use an appropriate cutting fluid to reduce friction and extend tool life. Apply steady, controlled torque with a properly sized tap wrench and back off periodically to break chips, especially in blind holes. Inspect the tap for chipping or wear before each use to avoid tap breakage and thread damage.

Technical Specifications

• Thread Size: 1-5/8 inches
• Thread Pitch: 8 TPI
• Tap Style: Bottom
• Material: High-Speed Steel (HSS)
• Operation Type: Hand tap
• Weight: 4.2 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-16250-8-B-I