Accupro T2690423 Spiral Point Tap 1/4-28 3 Flutes Hss

Product Description

The ACCUPRO T2690423 is a spiral point tap designed for cutting right-hand internal threads in a range of materials, including titanium. Built from 3% vanadium high speed steel with a bright finish, this tap delivers consistent thread quality in production and repair applications. It cuts a 1/4-28 UNF thread profile, operates to a Class 3B fit with an H3 thread limit, and features a plug chamfer for general through-hole tapping. The 3-flute spiral point geometry pushes chips forward ahead of the cutting zone, reducing clogging in through-hole applications. Overall length is 2.5 inches with a thread length of approximately 0.748 inches (19 mm).

This tap is suited for metalworking operations requiring fine-thread 1/4-28 UNF taps, including aerospace component work, general machining, and field repair tasks where titanium or similar hard materials are encountered. The plug chamfer style makes it a standard choice for through-hole tapping on CNC machines, drill presses, and hand-tapping setups. Its compact 2.5-inch overall length fits most standard tap holders without modification.

Key Features

• 1/4-28 UNF thread size for fine-pitch threading applications
• 3-flute spiral point geometry pushes chips forward, ideal for through-hole tapping
• Plug chamfer provides gradual thread engagement for general-purpose use
• 3% vanadium high speed steel construction for durability in hard materials including titanium
• H3 thread limit and Class 3B fit for consistent, close-tolerance results
• Bright finish, no coolant-through required

Compatibility

Designed as a standard 1/4-28 UNF spiral point plug tap suitable for use in common tap holders and machines that accept round-shank taps with a 6.48 mm shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician using a properly aligned tap holder or tapping head. Ensure the workpiece is securely fixtured and the spindle or tap wrench is aligned coaxially with the pilot hole before engagement. Apply appropriate cutting fluid for the workpiece material, particularly when tapping titanium or other difficult alloys. Follow shop safety procedures and applicable machine guarding standards during operation.