Hertel K014607AS Spiral Point Tap 1/2-20 Unf Hss

Product Description

The HERTEL K014607AS is a spiral point tap designed for threading 1/2-20 UNF (Unified National Fine) holes in metal workpieces. It features a plug chamfer, three flutes, and is manufactured from high-speed steel (HSS) with a bright, uncoated finish. The spiral point geometry pushes chips forward ahead of the cut rather than packing them behind the tap, making it well suited for through-hole threading operations. With an H11 thread limit and an oversize allowance of 0.0050 inch, this tap produces threads that accommodate standard tolerances for plated or coated fasteners. Licensed machinists, maintenance mechanics, and tool-room professionals are the primary users.

This tap is appropriate for threading through-holes in ferrous and non-ferrous materials where a 1/2-20 UNF thread form is required. The 1/2-20 thread pitch is commonly found in automotive, hydraulic, and mechanical assembly applications where a fine-thread engagement is preferred over coarse-thread alternatives. The plug chamfer, which typically provides 3 to 5 lead threads, allows the tap to start easily in a pre-drilled hole and is the standard choice for general-purpose through-hole tapping on a drill press, CNC machining center, or manual tapping arm.

Key Features

• Spiral point (gun tap) geometry pushes chips forward, preventing chip packing in through-hole applications
• 1/2-20 UNF thread form with right-hand thread direction
• High-speed steel construction provides durability across a broad range of workpiece materials
• H11 thread limit with 0.0050 inch oversize allowance for post-plate or post-coat thread sizing
• Bright uncoated finish — no additional coating buildup to affect thread tolerance
• Three-flute design balances chip clearance and tool body strength at this diameter

Compatibility

Designed as a standard replacement or stock tap for 1/2-20 UNF through-hole tapping operations on drill presses, manual tapping machines, and CNC machining centers that accept straight-shank taps with a 0.3670 inch shank diameter.

Installation Notes

Secure the tap in a properly sized tap wrench, tapping head, or CNC spindle chuck before use, and ensure the workpiece is clamped firmly. Always use an appropriate cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Back the tap off periodically during hand tapping to break chips. This tap does not have coolant-through capability, so flood or brush-applied lubrication is required for production tapping applications.