Somta Somta Series 551 - HSS Short Hand Tap 1/4" UNF Second (Intermediate)

HSS Second (Intermediate) Short Hand Tap 1/4” UNF

The SOMTA 5510642 – 1/4” HSS Second (Intermediate) Short Hand Tap is a precision tool designed for general-purpose hand tapping in both workshop and maintenance environments. Compliant with ISO 529 standards and manufactured from high-speed steel (HSS), this tap produces Unified Fine (UNF) threads with a 60o flank angle and ISO 2 / 2B tolerance. The straight flute design supports reliable chip removal, and the right-hand cutting action ensures compatibility with standard tapping procedures. As the second tap in a 3-piece sequence, it is intended for continued thread forming after the taper stage. This listing is for one individual second (intermediate) tap only.

• UNF Thread Form – Unified Fine Thread standard for accurate, high-precision threading.
• Second Tap (Intermediate) – Used after the taper tap to refine thread depth and shape.
• High-Speed Steel (HSS) – Delivers excellent wear resistance and long-lasting cutting performance.
• Straight Flute Design – Promotes effective chip clearance during hand operations.
• 60o Flank Angle – Ensures consistent and industry-compliant thread profiles.
• ISO 2 / 2B Tolerance – Suitable for general internal thread applications and standard fitment.
• Right-Hand Cutting – Designed for use with clockwise-operated tap wrenches.
• Compatible with Blind & Through Holes – Offers flexibility in varied tapping scenarios.
• Manual Tapping – Engineered specifically for hand use across professional tasks.

• Part No: 5510642
• Tap Size: 1/4” UNF
• Threads Per Inch (TPI): 28
• Overall Length (l1): 66 mm
• Thread Length (l2): 19 mm
• Shank Diameter (d1): 6.3 mm
• Square Size (a): 5.0 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 Intermediate Threading – Designed to ensure smooth thread progression between taper and bottom taps.
• Built from Durable HSS – Delivers longevity and consistent performance over repeated use.
• Versatile Manual Tapping – Works effectively across both blind and through-hole applications.