STI Hand Tap ISO 529 HSS-G - M 40 x 3
This STI hand tap is used when a damaged standard thread is rebuilt with a wire thread insert. For M 40 x 3, the receiving thread geometry is the key point: the 40.90 mm core hole, 43.9 mm B dimension and 3.0 mm pitch must work together so that the insert can carry the final thread reliably.
This size is particularly useful for large repair threads with a fine 3 mm pitch where the tool still needs to be guided carefully by hand. Manual use helps you align the tool calmly and control the torque during cutting.
- for general use
- for easily machinable materials up to 900 N/mm²
- for unalloyed and low-alloy steels
- for manual use
- for STI receiving threads in size M 40 x 3
- for repair processes with a specified 40.90 mm core hole
- for controlled repairs on large internal threads with a finer pitch
- for maintenance, workshop use, plant service and single-part repair
- for applications where the finer pitch supports controlled thread guidance
Note: This tap creates the STI receiving thread, not the final working thread in the component. For M 40 x 3, the 40.90 mm core hole, 3.0 mm pitch and thread insert system must be checked together. Matching components can be found in the VÖLKEL thread repair range.
- designed specifically for M 40 x 3 instead of being a standard tap
- clear process data with 40.90 mm core hole, 43.9 mm B dimension and ISO1 (4H)
- HSS-G design for general use in easily machinable materials
- hand guidance makes controlled starting easier on large diameters
- well suited for individual thread repairs rather than series production
- the finer pitch supports calm and precise repair work
Disadvantage
- STI tools must match the insert system precisely; if insert length or material strength is unclear, choose a suitable VÖLKEL thread repair solution before machining
- Inspect the damaged thread and make sure the surrounding material is still suitable for repair.
- Drill or check the core hole for M 40 x 3 to 40.90 mm.
- Deburr the bore and remove chips so that the hand tap can start cleanly.
- Align the STI hand tap square to the bore and use a suitable tap wrench.
- Apply cutting lubricant and start the first turns without side load.
- Cut with steady movements and break chips regularly by reversing briefly.
- Check the usable thread depth with the 39.000 mm thread length in mind.
- Clean and inspect the receiving thread before installing the matching wire thread insert.
- 1x STI Hand Tap ISO 529 HSS-G - M 40 x 3
- Article number: 03066
- Product type: STI hand tap for receiving threads
- Type category: HGB
- Type: S2
- Standard reference: ISO 529
- Material: HSS-G
- Thread type: STI-M
- Nominal size: M 40 x 3
- Pitch: 3.0 mm
- Thread direction: RH
- Thread standard: DIN 13
- Tolerance: ISO1 (4H)
- B dimension: 43.9 mm
- Core hole diameter: 40.90 mm
- Overall length L1: 149.000 mm
- Thread length L2: 39.000 mm
- Shank diameter D2: 28.000 mm
- Square k: 26.000 mm
- Bore: DSLO
- Packaging unit: 1
- GTIN: 4022835030669
- What is different from a standard M 40 x 3 tap?
This tool cuts the STI receiving thread for a wire thread insert. The final working thread is created by the insert, so it must not be used like a standard M 40 x 3 tap.
- Which core hole is specified?
Article 03066 specifies a core hole diameter of 40.90 mm. This value must match the insert system and the required repair depth.
- Why is hand tapping useful for large repairs?
With large diameters, torque and alignment have a stronger influence on the result. Manual guidance gives better control over starting, chip breaking and cutting progress.
- Which materials are suitable for this HSS-G version?
It is intended for general use in easily machinable materials up to 900 N/mm², especially unalloyed and low-alloy steels.
- What should be checked before fitting the insert?
Check that the receiving thread, 40.90 mm core hole, thread depth and insert system fit together. The thread should be clean, chip-free and correctly aligned.
- Where can matching system components be found?
Matching inserts, tools and accessories are available in the VÖLKEL thread repair range.
Do you need support with selection or application?
Use the contact form.
