Hertel K008101AS Straight Flute Tap 4-48 Unf Hss

Product Description

The HERTEL K008101AS is a straight flute tap designed to cut 4-48 UNF internal threads in a single pass. Built from high-speed steel with a bright, uncoated finish, it delivers reliable performance in a range of common shop and field tapping operations. The plug chamfer provides a gradual thread lead-in, making it well-suited for through-hole applications where the tap can pass fully through the workpiece. With 3 flutes and an H2 thread limit, this tap produces consistent 2B class-of-fit threads appropriate for standard fastener applications. Overall length is 1.875 inches. It is a right-hand thread tap intended for use in manual or machine tapping setups.

This tap is used in metalworking, maintenance, and repair applications across industrial, mechanical, and trade settings. It is sized for the number 4-48 UNF thread specification, which appears in precision assemblies, small fastener work, and equipment repair. Machinists, tool and die technicians, and maintenance tradespeople working with fine-thread fasteners in steel, aluminum, brass, and similar machinable materials will find this tap appropriate for their applications. It is sold in single-unit quantities with a minimum order of one.

Key Features

• 4-48 UNF thread size for fine-pitch internal threading in small-diameter applications
• High-speed steel construction provides durability across a range of machinable metals
• Plug chamfer (3-5 thread lead-in) suited for through-hole tapping
• 3 straight flutes for chip clearance in conventional tapping operations
• H2 thread limit ensures consistent 2B class-of-fit thread tolerance
• Bright, uncoated finish allows visual wear inspection during service life
• Right-hand thread direction for standard tapping operations

Compatibility

Designed as a standard replacement or stock tap for any manual tap wrench, T-handle, or machine tapping setup accepting straight shank taps sized for the 4-48 UNF thread standard.

Installation Notes

Installation is performed by machinists or qualified maintenance technicians using a tap wrench, tapping head, or CNC machine equipped for rigid or floating tap holders. Always ensure the workpiece is securely fixtured before tapping and apply appropriate cutting fluid to reduce heat and extend tap life. Do not force the tap if resistance increases unexpectedly, as breakage in small-diameter taps is a common result of misalignment or chip packing. Dispose of worn taps per shop safety protocols and never re-sharpen a tap without proper grinding equipment.