Hertel K008930AS Tap Set 1/2-20 Unf 4 Flute Hss Bright

Product Description

The HERTEL K008930AS is a 3-piece tap set ground to 1/2-20 UNF specifications for threading ferrous and non-ferrous workpieces in precision machining and maintenance applications. Each tap is manufactured from high speed steel (HSS) with a bright finish and features 4 flutes for efficient chip evacuation. The set covers Class of Fit 2B and 3B, providing thread tolerance suitable for standard and close-tolerance assemblies. Overall length measures 3-3/8 inches, and the thread limit is rated H3. The set is suited for use in manual tap handles or machine tapping operations and is sized for trade machinists, maintenance mechanics, and tool room technicians.

This tap set is intended for cutting 1/2-20 UNF internal threads in materials where a fine-thread pitch is required, such as precision fastener applications, hydraulic fittings, and instrument-grade assemblies. The 4-flute geometry suits through-hole and blind-hole applications in softer to medium-hardness metals. The 3-piece configuration typically includes a taper, plug, and bottoming tap, allowing the technician to progress from initial thread entry to full thread depth in a single setup.

Key Features

• 1/2-20 UNF thread specification for fine-pitch internal threading
• High speed steel construction for durability across a range of workpiece materials
• 4-flute design promotes chip clearance and thread quality
• Bright finish — no coating to alter cutting geometry or add dimensional buildup
• H3 thread limit for controlled tolerance fit
• Class of Fit 2B and 3B coverage in a single 3-piece set

Compatibility

Designed as an OEM-style replacement or toolroom-standard tap set for use in any manual or machine tapping application requiring 1/2-20 UNF internal threads.

Installation Notes

Install and operate taps using a calibrated tap handle or machine tapping fixture appropriate for the 1/2-20 UNF size. Always secure the workpiece firmly before tapping, apply cutting fluid rated for the workpiece material, and back off periodically to break chips. Inspect tap condition before each use — a chipped or dull tap should be replaced, not forced.