Hertel K008914AS Tap Set 6-40 Unf 3 Flute Hss

Product Description

The HERTEL K008914AS is a 3-piece tap set designed for cutting 6-40 UNF internal threads in metal workpieces. Manufactured from high speed steel with a bright finish, this set delivers consistent thread form in light to medium-duty tapping applications. The 3-flute geometry provides balanced cutting action and adequate chip clearance for the fine-pitch 6-40 thread profile. Overall length is 2 inches, and the set covers class of fit 2B and 3B, making it suitable for standard tolerance thread engagements where fit precision matters. Licensed machinists, maintenance technicians, and tool-and-die professionals reach for sets like this when threading small-diameter fastener holes in ferrous and non-ferrous materials.

This tap set is suited for threading 6-40 UNF holes in production and maintenance environments. The 6-40 fine thread is common in instrument work, small mechanical assemblies, and precision hardware applications where higher thread count per inch improves holding strength in thin material sections. The H2 thread limit designation indicates a controlled tolerance offset from nominal thread size, appropriate for plated or tight-fit fastener applications. Each set includes 3 pieces to support a progressive tapping sequence from starting taper through bottoming as required by the job.

Key Features

• Thread size 6-40 UNF, high speed steel construction for durability across common workpiece materials
• 3-flute design balances cutting forces and chip evacuation on small-diameter threads
• H2 thread limit for controlled tolerance fit in precision or plated-fastener applications
• Class of fit 2B and 3B coverage handles standard and tight-tolerance thread engagements
• Bright finish with 2 inch overall length, compact profile for confined-space tapping
• 3-piece set supports progressive tapping sequences from taper to bottoming

Compatibility

Designed as an OEM-style replacement or direct-use tap set for any application requiring 6-40 UNF internal threads with a 2B or 3B class of fit.

Installation Notes

Tapping should be performed by a qualified machinist or maintenance technician familiar with proper speeds, feeds, and cutting fluid selection for the workpiece material. Always secure the workpiece and use a tapping fixture or drill press to maintain perpendicular thread alignment. Back the tap out periodically to break and clear chips, particularly in blind-hole applications. Inspect taps for wear or chipping before each use and replace any damaged tap in the set before continuing work.