V-COIL Wire thread inserts, Refill pack Free running type S UNF 1/4 x 28 - 3.0 D (10 pcs.)

• Restore damaged internal threads in components, housings, and machine parts.
• Use when you need a repair process that supports repeated service and fastener replacement.
• Common in maintenance, overhaul, and field repair where replacement parts are costly.
• Process: manual driving or assisted driving depending on your holder and machine setup
• Use: thread cutting, re tapping, and thread cleaning depending on condition
• Use a suitable lubricant for the work material and keep the tool aligned to the axis.

Note Use the matching STI tap and installation tooling for the insert system in the product name.

• Restores functional threads without replacing the full component
• Supports repeatable fastener assembly after repair
• Reduces downtime in maintenance and overhaul work
• Helps standardize repair steps across service locations
• Helps keep thread quality stable when you use appropriate lubrication

• Sensitive to misalignment, especially during the first turns
• Practical speed is limited by manual handling and by access conditions at the workpiece

1. Assess the damage and confirm that thread repair is the appropriate option for the component.
2. Secure the workpiece and align your tooling to the original thread axis.
3. Remove the damaged thread using the preparation drill step required by the repair system.
4. Create the STI thread using the correct STI tap for the insert system in the product name.
5. Clean the hole and remove chips and cutting fluid residues.
6. Install the wire thread insert with the matching installation tool and stop at the intended position.
7. If the insert style uses a tang, remove the tang using the correct breaking tool and keep the bore clean.
8. Verify the repaired thread with the intended fastener or a suitable gauge and protect the repaired area.

• 10 pieces V-COIL Wire thread inserts, Refill pack Free running type S UNF 1/4 x 28 - 3.0 D (10 pcs.)

• Product type: Wire Thread Insert
• System: Wire thread insert based repair process
• Thread designation: UNF

How do you select the correct thread designation for this product Match the thread designation in the product name to the mating fastener or component standard, then confirm that your workpiece material and process setup suit the tool type. If you work with mixed standards, separate your tooling by thread family to avoid mix ups. Where do you find more technical information for this tool type Technical information wire thread inserts DIN 8140 as PDF What preparation steps are typical in a wire insert repair A typical workflow includes drilling out the damaged thread, cutting an STI thread with the matching tap, cleaning the hole, then installing the insert. Correct alignment through all steps is essential for a straight repaired thread. Which hole preparation checks matter most Prepare the entry edge, remove burrs, and keep the hole clean so the tool starts straight. In blind holes, confirm that there is enough depth for the tool lead and chip space. In through holes, support chip evacuation out of the exit side. Which reference information supports setup and selection Technical information V-COIL thread repair as PDF How do you reduce the risk of misalignment Start the tool with the axis visually aligned, then guide it through the first turns with low torque. Use stable workholding and avoid side load. If a thread feels tight early, remove the tool, clean chips, and inspect the entry. When is an insert repair the right choice Use an insert when the original thread is stripped or repeatedly loosened and you need a serviceable thread for repeated assembly. Inserts are common in soft alloys and in parts that see frequent maintenance. Confirm that there is enough wall thickness for the repair. Where can you find the full VÖLKEL catalog section for this product family VC 23 catalog as PDF