Hertel K008552AS Straight Flute Tap 9/16-18 Unf Hss

Product Description

The HERTEL K008552AS is a straight flute tap designed to cut internal 9/16-18 UNF threads in a variety of metalworking and machining applications. Built from high-speed steel (HSS) with a bright, uncoated finish, this tap delivers reliable thread cutting performance without the added cost of specialty coatings. It features a taper chamfer, which eases entry into the workpiece and distributes cutting load across multiple leading threads. The overall length measures 3 and 19/32 inches, and the tool carries an H3 thread limit for consistent fit and tolerance control in production and maintenance environments.

This tap is suited for threading operations in machine shops, maintenance facilities, and manufacturing environments where 9/16-18 UNF right-hand threads are required. The straight flute design makes it appropriate for use in through-holes and in materials that produce broken chips, such as cast iron, brass, and some steels. The taper chamfer configuration is particularly well matched to hand tapping and machine tapping setups where thread entry alignment is critical.

Key Features

• 9/16-18 UNF thread size with right-hand thread direction
• Taper chamfer for gradual thread engagement and easier starting
• 4 straight flutes for efficient chip clearance in brittle materials
• High-speed steel construction for durability across common workpiece materials
• Bright, uncoated finish — no coating buildup, easy to inspect for wear
• H3 thread limit for controlled tolerance fit in UNF applications

Compatibility

Designed for use in any standard tap holder, T-handle, or machine tapping chuck that accepts the appropriate shank size for a 9/16-18 UNF straight flute tap.

Installation Notes

This tap is installed and operated by a machinist or maintenance technician using a tap wrench, T-handle, or CNC or manual tapping machine. Ensure the workpiece is securely fixtured and the correct pilot hole diameter for 9/16-18 UNF threads has been drilled before starting. Apply cutting fluid appropriate to the workpiece material to reduce heat and extend tool life. Do not force a tap that has stalled — back off to break chips before continuing.