Somta Somta Series 551 - HSS Short Hand Tap No.8 UNF Second (Intermediate)

HSS Second (Intermediate) Short Hand Tap No.8 UNF

The SOMTA 5510422 – No.8 HSS Second (Intermediate) Short Hand Tap is a precision-engineered threading tool designed for general-purpose hand tapping. Built to ISO 529 standards and crafted from high-speed steel (HSS), this tap delivers consistent Unified Fine (UNF) threads with a 60o flank angle. Its straight flute design ensures effective chip evacuation, while the right-hand cutting action supports smooth, controlled tapping in both blind and through holes. As the second tap in a standard 3-piece set, it plays a critical role in intermediate thread formation during maintenance, repair, or fabrication work.

• UNF Thread Form – Unified Fine Thread standard ensures precision and compatibility.
• Second Tap (Intermediate) – Designed for continued thread cutting following the taper tap.
• High-Speed Steel (HSS) – Offers excellent wear resistance and extended tool life.
• Straight Flute Geometry – Promotes reliable chip clearance during hand operations.
• 60o Flank Angle – Delivers accurate and industry-standard thread profiles.
• ISO 2 / 2B Tolerance – Ideal for general-purpose internal threads and fastener fits.
• Right-Hand Cutting – Standard clockwise cutting direction for conventional tapping.
• Blind & Through Hole Tapping – Capable of handling both tapping scenarios effectively.
• Manual Use – Optimized for controlled hand tapping in workshop or field environments.

• Part No: 5510422
• Tap Size: No.8 UNF
• Nominal Diameter: 4.17 mm
• Threads Per Inch (TPI): 36
• Overall Length (l1): 53 mm
• Thread Length (l2): 13 mm
• Shank Diameter (d1): 4.5 mm
• Square Size (a): 3.55 mm
• Number of Flutes: 3
• Thread Angle: 60o, UNF Form
• Material: High-Speed Steel (HSS)
• Flute Type: Straight Flute
• Standard: ISO 529
• Tolerance: ISO 2 / 2B
• Cutting Direction: Right-Hand
• Application: General-Purpose Hand Tapping

• Reliable Thread Formation – Ideal for intermediate cutting between taper and bottom taps.
• Precision-Built for UNF Threads – Ensures thread accuracy and fit for standard fine-thread applications.
• Durable HSS Construction – Maintains edge sharpness and performance through repeated use.