Description

The SECO 10001184 is a spiral point tap designed for through-hole threading in demanding materials including stainless steel, non-ferrous metals, superalloys, titanium, and hardened steel. It is ground from high-speed steel with powder metallurgy enhancement (HSS-E-PM) and finished with an aluminum chromium nitride (AlCrN) coating for improved heat resistance and tool life. The tap cuts a 1/4-28 UNJF thread to a 3B class of fit with a plug chamfer for gradual thread engagement. Overall length is 3.256 inches (80 millimeters) and thread length is 0.591 inches (15 millimeters). Installation is performed by machinists and maintenance technicians in CNC or manual tapping operations.

This tap is suited for production and maintenance threading applications where tight tolerances and thread form integrity are required. The UNJF (Unified National Miniature Fine) thread standard is specified in aerospace and high-strength fastener applications where root radius geometry reduces stress concentration. The right-hand spiral point style pushes chips ahead of the tap through the hole, making it appropriate for through-hole applications rather than blind holes. The 3-flute configuration balances chip clearance and tool body strength at this diameter.

Key Features

HSS-E-PM construction provides consistent grain structure and edge toughness for difficult materials
AlCrN coating reduces heat buildup and extends tool life in stainless steel, titanium, and superalloys
Plug chamfer with 3 to 5 thread lead for gradual thread engagement and reduced starting torque
Spiral point geometry pushes chips forward through the hole, ideal for through-hole threading
3B class of fit produces threads within standard tolerance for general aerospace and mechanical assemblies
Right-hand thread direction, no coolant-through, non-oversize, uninterrupted thread form

Compatibility

Designed for through-hole tapping of 1/4-28 UNJF threads in stainless steel, non-ferrous metals, superalloys, titanium, and hardened steel. Belongs to SECO MTP series spiral point taps.

Installation Notes

Installation is performed by machinists using CNC machining centers, drill presses, or manual tapping equipment. Ensure the workpiece is rigidly fixtured and the tap is properly aligned before engagement to avoid tap breakage. This tap does not have coolant-through capability, so flood or mist coolant should be applied externally when threading heat-sensitive materials such as stainless steel or titanium. Follow applicable shop safety procedures and manufacturer feed rate recommendations for the specific workpiece material.

Technical Specifications

Thread Size: 1/4-28
Thread Standard: UNJF
Threads per Inch: 28
Class of Fit: 3B
Thread Direction: Right Hand
Chamfer: Plug
Number of Flutes: 3
Style: Spiral Point
Application: Through-Hole Threading
Material: High-Speed Steel with Powder Metallurgy (HSS-E-PM)
Coating: AlCrN (Aluminum Chromium Nitride)
Material Application: Stainless Steel, Non-Ferrous Metal, Superalloys and Titanium, Hardened Steel
Overall Length: 3.256 inches (80 millimeters)
Thread Length: 0.591 inches (15 millimeters)
Shank Diameter: 0.276 inches (7 millimeters)
Neck Length: 0.394 inches
Thread Pitch: 0.0357 inches
Coolant Through: No
Oversize: No
Series: MTP
Weight: 0.11 pounds