Somta Series 551 - HSS Short Hand Tap No.12 UNF Second (Intermediate)

SKU:5510552

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HSS Second (Intermediate) Short Hand Tap No.12 UNF

The SOMTA 5510552 - No.12 HSS Second (Intermediate) Short Hand Tap is a high-precision threading tool designed for general-purpose hand tapping. Manufactured to ISO 529 standards and made from high-speed steel (HSS), this tap produces Unified Fine (UNF) threads with a 60° flank angle and ISO 2 / 2B tolerance. The straight flute design supports efficient chip removal, and the right-hand cutting action allows for conventional clockwise threading. This second tap is used in the middle of a standard 3-piece tap set to advance thread formation after the taper tap. This listing is for one individual second (intermediate) tap only.

Key Features & Benefits

  • UNF Thread Form – Unified Fine Thread for precise, industry-standard threading applications.
  • Second Tap (Intermediate) – Mid-stage tool used to deepen and shape threads after taper tap use.
  • High-Speed Steel (HSS) – Excellent hardness and wear resistance for long-lasting use.
  • Straight Flute Design – Allows clean chip evacuation in hand tapping operations.
  • 60° Flank Angle – Supports accurate and consistent UNF thread geometry.
  • ISO 2 / 2B Tolerance – Delivers a dependable fit for standard threaded assemblies.
  • Right-Hand Cutting – Designed for clockwise threading with standard tap wrenches.
  • Compatible with Blind & Through Holes – Versatile tap suitable for varied workshop conditions.
  • Manual Use – Built specifically for hand tapping applications.

Technical Specifications

  • Part No: 5510552
  • Tap Size: No.12 UNF
  • Nominal Diameter: 5.49 mm
  • Threads Per Inch (TPI): 28
  • Overall Length (l1): 62 mm
  • Thread Length (l2): 17 mm
  • Shank Diameter (d1): 5.6 mm
  • Square Size (a): 4.5 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 5510552 Second Tap?

  • Accurate Mid-Stage Threading – Ideal for advancing threads with smooth engagement and control.
  • Reliable HSS Construction – Maintains precision and durability over repeated manual use.
  • Flexible Performance – Works effectively in both blind and through-hole tapping situations.

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