Hertel K011090AS Bottoming Hand Tap 3/8-16 Unc Hss

Product Description

The HERTEL K011090AS is a 3/8-16 UNC bottoming hand tap designed for cutting internal threads to the bottom of blind holes. Manufactured from high speed steel with a bright uncoated finish, it provides reliable cutting performance in a range of ferrous and non-ferrous materials. The tap features a 3-flute straight flute geometry and a right-hand thread direction. With an overall length of 2.9375 inches and a thread length of 1.25 inches, it is sized for standard hand-tapping operations in tool rooms, maintenance shops, and production environments. Installation is performed by hand using a standard tap wrench.

This tap is suited for threading blind holes where full thread depth to the bottom of the bore is required. The bottoming chamfer — typically 1 to 2 threads of lead — allows the tap to cut threads as close to the bottom of a hole as possible. It is commonly used in machining, fabrication, repair, and assembly applications involving 3/8-16 UNC fastener holes. The H1 thread limit designates a tight tolerance class appropriate for general-purpose threading where close-fit thread accuracy is needed.

Key Features

• Bottoming chamfer for threading to the bottom of blind holes
• 3/8-16 UNC thread form, right-hand cut
• High speed steel construction for durability across a range of materials
• Bright uncoated finish — no coating buildup affecting thread tolerance
• H1 thread limit for controlled, close-tolerance thread fit
• 3-flute straight flute design for balanced cutting action in hand-tapping operations

Compatibility

Designed as a standard replacement or working tap for any application requiring a 3/8-16 UNC bottoming hand tap with H1 thread limit and straight flute geometry.

Installation Notes

This tap is intended for hand-tapping use with a standard tap wrench. Ensure the workpiece is securely fixtured and the pilot hole is drilled to the correct tap drill diameter for 3/8-16 UNC threads before tapping. Apply cutting fluid appropriate for the workpiece material to reduce friction and extend tap life. Back off the tap periodically to break chips and avoid binding, particularly in deeper blind holes.