Hand Tap set of 3 pieces ISO 529 HSS-G - BA 7 x 52.92

• for manually producing internal threads in workshop, assembly, maintenance and single-part production work
• for staged machining when the thread needs to be started in a controlled manner and subsequently brought to its final form
• for cutting new threads, reworking and controlled thread cleaning, depending on the condition of the internal thread
• Process: manual or assisted drive, depending on your tool holder and machine configuration
• Use: thread cutting, thread chasing and thread cleaning, depending on the condition of the thread

Note With tap sets, the sequence of cutting stages determines guidance, cutting pressure and thread quality.

• the staged cutting sequence reduces the load per cutting pass compared with a single tool
• ISO 529 makes it easier to match the tools to drawings, stock records and inspection plans
• HSS-G supports clean cutting-edge geometry with controlled manual guidance
• BA 7 x 52.92 is included directly in the product designation and prevents confusion with similar thread systems

• not the right choice when a machine process with short cycle times or synchronised feed is required

1. Check the thread designation, standard and pitch on the workpiece or drawing.
2. Prepare the tapping hole correctly, deburr it and clamp the workpiece securely.
3. Start the taper tap straight and guide the initial cut with even pressure.
4. Use the second tap if the set includes an intermediate stage and the thread form needs to be developed further.
5. Use the bottoming tap to bring the thread form to its final dimensions in a controlled manner.
6. Keep the tool and hole clean during machining to prevent chips from damaging the thread flanks.
7. Clean the thread after cutting and check it with a suitable screw or thread gauge.
8. Dry the tools, apply light protection and store them separately according to cutting stage.

• 1 piece Hand Tap Taper ISO 529 Form A HSS-G - BA 7 x 52.92 (89417-1)
• 1 piece Hand Tap Second ISO 529 Form D HSS-G - BA 7 x 52.92 (89417-2)
• 1 piece Hand Tap Bottoming ISO 529 Form C HSS-G - BA 7 x 52.92 (89417-3)

• Product type: Three-piece hand tap set
• Standard: ISO 529
• Material: HSS-G
• Thread: BA 7 x 52.92
• Thread type: BA
• Thread standard: BS 93
• Tolerance: medium
• Version: Set with three cutting stages
• Flute form: N
• Tapping drill diameter: 2.05 mm
• Overall length L1: 44.5 mm
• Thread length L2: 9.5 mm
• Shank diameter D2: 2.8 mm
• Square size k: 2.24 mm

Why is the set better than a single hand tap?

A set cuts the thread in stages. This distributes the load and provides more controlled thread formation when working by hand.

What is the correct sequence of cutting stages?

Start with the taper tap, continue with the second tap depending on the set and finish with the bottoming tap. With a two-piece set, only the intermediate stages that are not included are omitted.

How do you identify the correct thread selection?

The BA 7 x 52.92 thread designation must match the drawing, mating thread and inspection equipment exactly. Even small differences in pitch or thread system result in an incorrect fit.

What role does the tapping hole play?

The tapping hole affects cutting pressure, flank form and tool loading. Use the appropriate thread data before starting with the first tap.

When should you inspect the thread after cutting?

Always inspect when the connection is safety-critical, a recurring process needs to be verified or unusual assembly forces occur.

Where can you find further technical information on hand taps?

For tables, basic information and application guidance, use the Technical Information on Hand Taps PDF.

Is help available for inch threads?

For inch threads, it is important to distinguish clearly between thread systems and pitches. The Inch-mm Conversion Table PDF helps with technical identification.

Where can you find the relevant VÖLKEL catalogue?

Further product and selection information is available in the VD 23 Catalogue PDF.