Somta Somta Series 551 - HSS Short Hand Tap No.6 UNF Second (Intermediate)

HSS Second (Intermediate) Short Hand Tap No.6 UNF

The SOMTA 5510352 – No.6 HSS Second (Intermediate) Short Hand Tap is a precision-manufactured tool for general-purpose hand tapping applications. Built to ISO 529 standards and crafted from high-speed steel (HSS), this tap delivers accurate Unified Fine (UNF) threads with a standard 60o flank angle. Featuring a straight flute design and right-hand cutting direction, it performs reliably in both through-hole and blind-hole tapping scenarios. As the second stage in a traditional 3-piece hand tap set, this intermediate tap supports smooth and progressive thread formation across various workshop and maintenance tasks.

• UNF Thread Form – Unified Fine Thread for precise and secure fastener engagement.
• Second Tap (Intermediate) – Mid-sequence tap for refining threads after initial cutting with a taper tap.
• High-Speed Steel (HSS) – Provides superior wear resistance, edge retention, and durability.
• Straight Flute Design – Efficient chip clearance ideal for hand tapping.
• 60o Flank Angle – Produces standard-compliant UNF threads with reliable performance.
• ISO 2 / 2B Tolerance – Supports common thread fit applications in general-purpose use.
• Right-Hand Cutting – Compatible with standard tap wrenches and clockwise cutting motion.
• Blind & Through Hole Capability – Suitable for a wide range of tapping tasks.
• Manual Tapping – Optimized for hand use in professional workshop or repair settings.

• Part No: 5510352
• Tap Size: No.6 UNF
• Nominal Diameter: 3.51 mm
• Threads Per Inch (TPI): 40
• Overall Length (l1): 50 mm
• Thread Length (l2): 13 mm
• Shank Diameter (d1): 3.55 mm
• Square Size (a): 2.8 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

• Precision Threading – Ensures high-quality threads in metalworking, repair, and fabrication environments.
• Efficient Intermediate Tap – Ideal for continuing thread formation between taper and bottom taps.
• Long-Lasting HSS Build – Maintains performance under repeated manual use.