Cleveland C64040 Pipe Tap 3/8-18 Npt 4 Flute Hss

Product Description

The CLEVELAND C64040 is a standard taper pipe tap designed to cut 3/8-18 NPT internal threads in metal workpieces. Built from high-speed steel (HSS) with a bright, uncoated finish, it is suited for threading operations in non-ferrous materials and steel. The 4-flute geometry provides good chip evacuation and thread form accuracy across a range of hand and machine tapping applications. At 2.563 inches overall length with a 1.063-inch thread length, this tap fits standard tap handles and machine tool holders used by plumbers, pipefitters, HVAC technicians, and maintenance machinists cutting NPT pipe threads in the field or shop.

This tap is used wherever 3/8-18 NPT threaded connections are required, including pipe fittings, valve bodies, manifolds, and equipment housings in plumbing, HVAC, and general mechanical service work. It is appropriate for both hand tapping and low-speed machine tapping in non-ferrous aluminum and steel materials. The regular hook geometry and bright finish make it a general-purpose choice for shops and service technicians who need a reliable NPT tap without specialty coatings.

Key Features

• 3/8-18 NPT thread form for standard tapered pipe thread connections
• High-speed steel construction for durability in non-ferrous and steel applications
• 4-flute design promotes chip clearance and thread accuracy
• Bright, uncoated finish suitable for general-purpose tapping with cutting fluid
• 0.700-inch shank diameter fits standard tap wrenches and holders
• Compact 2.563-inch overall length suits tight-access tapping situations

Compatibility

Designed for cutting 3/8-18 NPT internal threads in non-ferrous aluminum and steel workpieces. Fits standard tap handles and machine holders sized for a 0.700-inch shank diameter.

Installation Notes

This tap should be installed and used by qualified machinists, pipefitters, or HVAC technicians familiar with NPT threading procedures. Always apply appropriate cutting fluid when tapping to extend tool life and improve thread quality. Secure the workpiece fully before beginning the tapping operation and back off periodically to break chips, especially in blind holes. Inspect the tap for wear or damage before each use and do not force a worn or damaged tap.