Hertel K008337AS Spiral Point Tap 1/4-20 Unc Hss

Product Description

The HERTEL K008337AS is a spiral point tap designed for threading 1/4-20 UNC through-holes in production and maintenance applications. Built from high-speed steel (HSS) with a bright, uncoated finish, it features a plug chamfer and 2 flutes. The spiral point geometry pushes chips forward ahead of the tap, making it well suited for threading through-holes where chips can exit freely. The H11 thread limit indicates a tight tolerance class appropriate for precision threading work. This tap runs right-hand direction and does not require coolant-through capability.

This tap is commonly used in machine shops, manufacturing facilities, and industrial maintenance settings where 1/4-20 UNC threads are required in through-hole applications. It is appropriate for use in soft to medium-hardness materials. The plug chamfer provides a gradual lead-in, distributing cutting load across several threads and allowing the tap to start cleanly. It is sized to produce oversize threads by 0.005 inches, a characteristic noted in the specifications for this part.

Key Features

• 1/4-20 UNC thread size for standard fractional through-hole tapping
• Spiral point design pushes chips forward, reducing clogging in through-hole applications
• High-speed steel construction provides durability across a range of workpiece materials
• Plug chamfer for smooth lead-in and distributed cutting load
• H11 thread limit for close-tolerance threading requirements
• Oversize by 0.005 inches to compensate for springback in applicable materials

Compatibility

Designed as an OEM-style replacement or direct-use spiral point tap for standard 1/4-20 UNC through-hole tapping operations in production and maintenance environments.

Installation Notes

This tap should be installed in a machine or hand tap holder rated for the shank size and used with appropriate tapping fluid or cutting oil for the workpiece material. Ensure the workpiece is securely clamped and the tap is properly aligned before beginning the threading operation. Do not reverse the tap without adequate chip clearance to avoid breakage. Follow applicable shop safety procedures and machine tool guidelines when operating powered tapping equipment.