STI Hand Tap ISO 529 HSS-G - M 39 x 3
For thread repairs with wire thread inserts, the fit of the receiving thread is critical so that the insert sits securely and remains dimensionally stable. This STI (Screw Thread Insert) hand tap is designed for thread repair and thread insert systems. For M 39 x 3, it prepares the receiving thread so that the insert can be fitted correctly.
For assembly, workshop and maintenance work, manual use is practical because you can control alignment and torque directly. This creates the basis for the thread insert to reproduce the final internal thread reliably.
- for general use
- for easily machinable materials up to 900 N/mm²
- for unalloyed and low-alloy steels
- for manual use
- for repair work on components with worn or damaged internal threads
- for recurring repair cases where a thread insert system is standardized
- for maintenance and service when threads need to be prepared on site
- for single-part machining in workshops, plant engineering or metalworking
Note: For STI threads, core hole, tap and thread insert system must match. For this version, a core hole diameter of 39.90 mm is specified. Further matching system solutions can be found in the VÖLKEL thread repair category.
- good process control during manual use thanks to sensitive feed control
- suitable for typical workshop and maintenance workflows
- reliable system planning when core hole, tap and thread insert are matched
- practical for reworking and restoring durable internal threads
- usable as a tap for thread inserts when the system dimensions of the insert are taken into account
Disadvantage
- with very high material strength, cutting forces may increase and tool life may decrease; for critical repair cases, suitable VÖLKEL thread repair solutions help with system selection
- Check the tool and bore so that the cutting edges can engage cleanly.
- Check the correct core hole diameter for the STI receiving thread.
- Position the hand tap at a right angle and start with a steady entry.
- Use a suitable tap wrench and guide both arms evenly.
- Use cutting lubricant and keep the torque constant.
- Cut steadily and avoid lateral load on the tool.
- Break chips with short reverse movements without interrupting the cutting path.
- Clean the receiving thread afterwards and prepare the installation of the insert.
- 1x STI Hand Tap ISO 529 HSS-G - M 39 x 3
- Article number: 03065
- 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 39 x 3
- Pitch: 3.0 mm
- Thread direction: RH
- Thread standard: DIN 13
- Tolerance: ISO1 (4H)
- B dimension: 42.9 mm
- Core hole diameter: 39.90 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: 4022835030652
- When do you need an STI hand tap?
It creates the STI receiving thread for the thread insert. This makes it part of the thread repair process, because the final internal thread is created by the insert.
- Why does a standard tap not fit here?
The receiving thread is matched to the system dimensions of the thread insert. A standard tap would create a standard thread and therefore would not fit the insert system.
- How do you select the correct version?
Compare the marking in the product name with the intended insert. M 39 x 3 is the reference size for this STI receiving thread.
- Which core hole diameter is specified?
For this version, a core hole diameter of 39.90 mm is specified. You should also check the system data for the thread insert and repair process.
- Which materials are typical for general use?
For general use, easily machinable materials up to 900 N/mm² are intended, including unalloyed and low-alloy steels. For difficult materials, choose the appropriate version depending on the application.
- Where can you find suitable thread repair solutions?
Further tools, inserts and system solutions can be found in the VÖLKEL thread repair category.
Do you need support with selection or application?
Use the contact form.
