Hertel K020556AS M30 X 3.50 Straight Flute Tap Hss Plug

Product Description

The HERTEL K020556AS is a straight flute tap designed for cutting M30 x 3.50 metric coarse internal threads in a plug chamfer configuration. Manufactured from high speed steel with a bright/uncoated finish, this tap produces right-hand threads and features four flutes for efficient chip clearance in through-hole and short blind-hole applications. With an overall length of 5.4375 inches and a thread length of 2.5625 inches, it is sized for production and maintenance threading operations where a standard D5 thread limit tolerance is required. Machinists and tool-and-die professionals are the primary users of this tap.

The K020556AS is suited for threading operations on medium to large diameter fastener holes in ferrous and non-ferrous metals where metric coarse thread form is specified. The plug chamfer — typically 3 to 5 threads of lead — makes it appropriate as a starting tap or as a stand-alone tap in through-hole work. It performs in manual, drill press, and light CNC tapping setups where coolant-through tooling is not required.

Key Features

• M30 x 3.50 metric coarse thread form, right-hand cut
• Plug chamfer for use as a starting or through-hole tap
• Four straight flutes for controlled chip flow in short-chipping materials
• High speed steel construction for durability across a range of work materials
• D5 thread limit for standard tolerance class fits
• Bright/uncoated finish — no coating buildup to affect thread tolerance

Compatibility

Designed as an OEM-style replacement or direct substitute for M30 x 3.50 metric coarse straight flute plug taps in standard toolholders and tap wrenches sized for a 1.021-inch shank diameter.

Installation Notes

Tapping operations should be performed by a qualified machinist following established shop safety practices. Secure the workpiece and ensure proper alignment before starting the tap to prevent thread damage or tool breakage. Apply appropriate cutting fluid for the work material to extend tool life and improve thread quality. Replace worn taps before tolerance drift results in out-of-spec threads.