Description
HSS Bottom Tap UNC 1-3/8″ x 6 – Somta Series 541
The SOMTA 5413493 – 1-3/8″ x 6 UNC HSS Bottom Tap is a heavy-duty threading tool designed for precise thread cutting at full depth in blind holes. Manufactured from high-speed steel (HSS), it features a short chamfer ideal for threading close to the bottom of a drilled hole. Conforming to the Unified National Coarse (UNC) thread profile, this tap delivers accurate and clean threading performance in a wide variety of industrial and fabrication applications.
Key Features & Benefits
- Bottoming Chamfer (1–2 Threads) – Optimized for threading to full depth in blind hole applications.
- Unified National Coarse (UNC) – 1-3/8″ diameter with 6 TPI for coarse-thread fastener compatibility.
- Straight Flute Geometry – Provides controlled chip flow and consistent cutting action.
- High-Speed Steel (HSS) – Delivers superior durability and cutting efficiency under high-load conditions.
- Bright Finish – Minimizes friction and promotes smoother threading.
- Versatile Tapping – Suitable for use with tap wrenches, tapping machines, and other threading tools.
Technical Specifications
- Part No: 5413493
- Thread Size: 1-3/8″ x 6 TPI
- Thread Standard: UNC – Unified National Coarse
- Tap Type: Bottoming (short chamfer for blind holes)
- Flute Style: Straight flute
- Cutting Direction: Right-hand
- Material Finish: High-Speed Steel (HSS), Bright
- Standard: ANSI / Unified Inch
Why Choose the SOMTA 5413493 UNC Bottom Tap?
- Maximum Thread Engagement – Reaches near the bottom of blind holes for strong thread integrity.
- Coarse Thread Capability – Suited for applications requiring robust, high-load threads.
- Reliable HSS Tooling – Built to withstand demanding industrial use over time.
- Trusted by Professionals – Ideal for machining, repair, and heavy fabrication work.
The SOMTA 5413493 bottom tap is the professional's choice for accurate coarse-thread tapping in large-diameter blind holes. Engineered from tough HSS and designed for precision, it delivers consistent performance across steel, aluminum, and other machinable metals.
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