Eagle Cutting Tool HT-3750-16-B-D 3/8-16 Hss Hand Bottom Tap

Product Description

The EAGLE CUTTING TOOL HT-3750-16-B-D is a 3/8-16 bottoming hand tap ground from high-speed steel (HSS) and manufactured in the USA. Bottoming taps are designed to cut threads to the bottom of a blind hole, making them essential when full thread depth is required close to the base of the bore. At 0.32 pounds, this is a compact, hand-use tap suited for threading steel, aluminum, cast iron, and similar materials. It carries a 3/8 inch diameter with a 16 threads-per-inch (TPI) pitch, conforming to the unified national coarse (UNC) thread standard.

This tap is used in maintenance, repair, and fabrication applications across plumbing, HVAC, electrical, and general mechanical trades. It is appropriate wherever a 3/8-16 UNC bottoming thread is needed in a blind hole, including tapping threaded bosses on equipment frames, brackets, pipe flanges, and mechanical assemblies. Machinists, pipefitters, millwrights, and maintenance technicians commonly keep this size on hand for field and shop work.

Key Features

• Bottoming tap geometry cuts threads to the base of blind holes where a plug or taper tap cannot reach
• HSS construction provides hardness and wear resistance for threading ferrous and non-ferrous metals
• 3/8-16 UNC thread form is one of the most common fastener sizes in trade and industrial applications
• USA manufactured to consistent dimensional tolerances
• Lightweight at 0.32 pounds for easy single-hand use with a tap wrench

Compatibility

Designed as a standard 3/8-16 UNC bottoming hand tap compatible with conventional tap wrenches and tap handles sized for this shank diameter.

Installation Notes

This tap is intended for hand use with a tap wrench — do not use in a power driver without confirming it is rated for machine use. Secure the workpiece firmly before tapping and apply cutting fluid appropriate for the base material to extend tap life and improve thread quality. Back the tap off periodically to break chips and clear the flutes, especially in deeper blind holes. Always wear eye protection when tapping.

Technical Specifications

• Thread Size: 3/8-16 UNC
• Tap Type: Bottom (Bottoming)
• Material: High-Speed Steel (HSS)
• Country of Origin: USA
• Weight: 0.32 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: HT-3750-16-B-D