Hertel 027701AS M1.6x0.35 Straight Flute Tap 6H Hss

Product Description

The HERTEL 027701AS is a straight flute tap designed for cutting M1.6x0.35 Metric Coarse internal threads in small-diameter through holes and blind holes where chip evacuation is managed manually or with cutting fluid. Manufactured from high-speed steel (HSS) with a bright uncoated finish, it is ground to a 6H class of fit and carries a D3 thread limit for close-tolerance thread production. The plug chamfer distributes cutting load across several leading threads, making it well suited for starting threads in pre-drilled holes. Overall length is 1.625 inches. This tap is intended for use by machinists, tool-and-die makers, and maintenance technicians working with metric fastener systems.

The 027701AS is used in applications requiring M1.6x0.35 Metric Coarse threads in ferrous and non-ferrous materials where straight flute geometry is appropriate. With only 2 flutes, the tap provides adequate flute clearance in small-diameter work. It is commonly applied in instrument manufacturing, electronics assembly fixtures, precision mechanical assemblies, and general maintenance machining where miniature metric threads are specified.

Key Features

• M1.6x0.35 Metric Coarse thread form for miniature metric fastener applications
• 2-flute straight flute geometry suits short-chipping and non-ferrous materials
• Plug chamfer for thread starting in pre-drilled through or blind holes
• 6H class of fit with D3 thread limit for consistent, close-tolerance threads
• High-speed steel construction for durability across a range of workpiece materials
• Bright uncoated finish - 1.625 inches overall length, right-hand thread

Compatibility

Designed as a standard OEM-style replacement or production tap for any application specifying M1.6x0.35 Metric Coarse, 6H class of fit internal threads.

Installation Notes

This tap is installed by machinists using a tap wrench, tapping head, or CNC rigid tapping cycle sized for the small shank diameter. Always ensure the pilot hole is drilled to the correct tap-drill diameter for M1.6x0.35 before tapping. Apply appropriate cutting fluid for the workpiece material to extend tap life and reduce the risk of breakage in this small diameter. Follow shop safety practices and verify spindle speed or hand-feed rate to avoid overloading the tap.