Somta Somta Series 551 - HSS Short Hand Tap 1-3/8" UNF Second (Intermediate)

HSS Second (Intermediate) Short Hand Tap 1-3/8” UNF

The SOMTA 5513492 – 1-3/8” HSS Second (Intermediate) Short Hand Tap is a heavy-duty, precision tap designed for general-purpose hand tapping of large-diameter UNF threads. Made from high-speed steel (HSS) and compliant with ISO 529 standards, it features a 60o flank angle thread form and ISO 2 / 2B tolerance for accurate, secure threading. The straight flute design promotes efficient chip evacuation, and the right-hand cutting action is ideal for use with standard tap wrenches. This intermediate tap is used after the taper tap to further form threads in both blind and through-hole applications. This listing is for one individual second (intermediate) tap only.

• UNF Thread Form – Unified Fine Thread profile ensures precise, fine-pitch threading for large components.
• Second Tap (Intermediate) – Ideal for continuing thread cutting after taper tapping in a 3-step sequence.
• High-Speed Steel (HSS) – Provides high wear resistance and cutting strength, even in demanding use.
• Straight Flute Design – Enables smooth chip flow and supports clean hand tapping.
• 60o Flank Angle – Produces standard thread profiles suitable for most UNF fittings.
• ISO 2 / 2B Tolerance – Ideal for general-purpose internal threading with standard fit requirements.
• Right-Hand Cutting – Compatible with clockwise tap operation using conventional tap wrenches.
• Blind & Through Hole Tapping – Delivers reliable results across both hole types.
• Manual Use – Designed specifically for controlled hand tapping in workshop and industrial environments.

• Part No: 5513492
• Tap Size: 1-3/8” UNF
• Threads Per Inch (TPI): 12
• Overall Length (l1): 144 mm
• Thread Length (l2): 39 mm
• Shank Diameter (d1): 25 mm
• Square Size (a): 20 mm
• Number of Flutes: 4
• 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 Intermediate Threading – Supports clean and controlled thread formation after taper cutting.
• Rugged HSS Construction – Built to withstand the demands of tapping large-diameter threads by hand.
• Flexible Tapping Performance – Suitable for both blind-hole and through-hole threading across various materials.