Titan Usa TT90673 Straight Flute Tap 1-1/8-12 Unf Hss

Product Description

The TITAN USA TT90673 is a straight flute hand tap designed for cutting 1-1/8-12 UNF internal threads in a wide range of materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it delivers consistent thread form for both 2B and 3B class-of-fit applications. The plug chamfer provides a moderate lead-in — typically 3 to 5 threads — making it suitable for through-hole tapping in production and maintenance environments. With an overall length of 5-7/16 inches and a thread length of 2-9/16 inches, this tap is sized for use in standard tap wrenches and machine holders. Machinists, toolmakers, and maintenance technicians are the primary users.

This tap is appropriate for threading operations in metalworking shops, MRO facilities, and manufacturing environments where 1-1/8-12 UNF fine-thread fastener bores are required. The straight flute design works best in through-holes or shallow blind holes where chip evacuation is manageable. The H4 thread limit designation indicates a controlled oversize ground thread, which accounts for plating allowances or tighter tolerance requirements. This tap is sold individually and is suited to low-volume hand tapping as well as machine tapping on lighter-duty setups.

Key Features

• 1-1/8-12 UNF thread form with plug chamfer for moderate lead-in on through-hole applications
• High-speed steel construction provides good wear resistance across a broad range of workpiece materials
• H4 thread limit ground for controlled oversize tolerance, suitable for plated or precision-fit threads
• 4 straight flutes for reliable chip clearance in through-hole and shallow blind-hole tapping
• 2B and 3B class-of-fit compatibility covers standard commercial and precision thread tolerance classes
• Right-hand thread direction; bright finish with no coating for compatibility with cutting fluids

Compatibility

Designed as a standard hand tap for use in 1-1/8-12 UNF thread applications; fits standard tap wrenches and machine tap holders sized for the 0.896-inch shank diameter of this Series 725 tool.

Installation Notes

This tap is installed by licensed machinists or qualified maintenance technicians using a calibrated tap wrench or machine tapping head. Ensure the workpiece is securely fixtured and the bore is drilled to the correct tap drill diameter for 1-1/8-12 UNF before starting. Apply an appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Do not force the tap if resistance increases sharply — back off to break chips and re-apply cutting fluid to avoid tap breakage.