Somta Series 551 - HSS Short Hand Tap No.4 UNF Second (Intermediate)

SKU:5510282

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HSS Second (Intermediate) Short Hand Tap No.4 UNF

The SOMTA 5510282 - No.4 HSS Second (Intermediate) Short Hand Tap is a precision-engineered tool designed for general-purpose hand tapping. Manufactured to ISO 529 standards and made from high-speed steel (HSS), this tap produces accurate UNF threads with a 60° flank angle. Its straight flute geometry and right-hand cutting action make it suitable for both through-hole and blind-hole tapping. This second tap is ideal for intermediate thread forming in a 3-piece tap set and is widely used in maintenance, repair, and fabrication environments.

Key Features & Benefits

  • UNF Thread Form – Unified Fine Thread standard for precision fastenings.
  • Second Tap (Intermediate) – Used after taper tap for continued thread cutting and improved alignment.
  • High-Speed Steel (HSS) – Offers excellent wear resistance and tool life.
  • Straight Flute Design – Supports chip evacuation in hand tapping operations.
  • 60° Flank Angle – Delivers accurate, industry-standard thread profiles.
  • ISO 2 / 2B Tolerance – Suitable for general-purpose internal threads.
  • Right-Hand Cutting – Clockwise cutting motion for standard tap wrenches.
  • Blind & Through Hole Capability – Versatile performance across common tapping tasks.
  • Manual Tapping – Designed specifically for hand use in workshop settings.

Technical Specifications

  • Part No: 5510004
  • Tap Size: No.4 UNF
  • Nominal Diameter: 2.85 mm
  • Threads Per Inch (TPI): 48
  • Overall Length (l1): 48 mm
  • Thread Length (l2): 11 mm
  • Shank Diameter (d1): 3.15 mm
  • Square Size (a): 2.5 mm
  • Number of Flutes: 3
  • Thread Angle: 60°, 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

Why Choose the SOMTA 5510004 Second Tap?

  • Precision Threading – Produces clean, accurate threads for reliable fastener engagement.
  • Intermediate Cutting Stage – Bridges the gap between taper and bottoming taps for smooth thread progression.
  • Durable HSS Construction – Built for long service life in demanding workshop conditions.

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