Hertel K008607AS Straight Flute Tap 3/4-16 Unf Hss

Product Description

The HERTEL K008607AS is a straight flute tap designed to cut 3/4-16 UNF internal threads in through-holes and shallow blind holes. Built from high-speed steel (HSS) with a bright/uncoated finish, it delivers reliable thread cutting in a range of ferrous and non-ferrous materials. The taper chamfer — spanning several leading threads — gradually distributes cutting load, making thread entry smooth and reducing the risk of tap breakage. With 4 flutes and an H3 thread limit, this tap holds close tolerances for a 3B class of fit, which is the standard tolerance for most general-purpose threaded assemblies in commercial and industrial applications.

This tap is suited for machining operations in maintenance, repair, and manufacturing environments where 3/4-16 UNF threads are required. The taper chamfer style is a common first-choice tap for starting threads in open or through-hole conditions. It is typically used in manual tapping with a tap wrench or integrated into a tapping head on a drill press or mill. Right-hand thread direction is standard for conventional threaded fastener applications. Machinists, tool-and-die makers, and maintenance technicians commonly select this tap for production and repair work on equipment components, fluid fittings, and structural fastener applications.

Key Features

• 3/4-16 UNF thread size with right-hand thread direction for standard fastener compatibility
• Taper chamfer distributes cutting load across multiple leading threads for easier thread start
• H3 thread limit ensures consistent tolerance control for 3B class of fit
• 4 straight flutes provide chip clearance in through-hole and short blind-hole applications
• High-speed steel construction supports use across a broad range of workpiece materials
• Bright/uncoated finish — no added coating layer that could affect thread tolerance in close-fit applications

Compatibility

Designed as a standard replacement or stock tap for applications requiring 3/4-16 UNF internal threads to a 3B class of fit tolerance. Compatible with standard tap wrenches, tapping heads, and machine tool holders sized for the shank of a 3/4-inch tap series.

Installation Notes

Tapping operations should be performed by a qualified machinist or maintenance technician familiar with thread cutting tools and speeds. Secure the workpiece fully before beginning; use appropriate cutting fluid for the workpiece material to extend tap life and improve thread finish. Confirm the correct tap drill size for 3/4-16 UNF before drilling to avoid undersized or oversized holes. Never force a tap — back off periodically to break chips and prevent binding or breakage.