Thread Repair Bộ sửa ren UNF 1/4 – UNF 1/2

• The kit is used to repair worn, stripped or damaged ren trong in metallic and many other load-bearing materials.
• It is also suitable for permanent thread reinforcement when the base material has lower shear strength and the connection needs to be permanently load-bearing.
• Thanks to the coordinated interaction of spiral drill, STI tap, installation tool, tang breaker and thread insert, the repair process can be carried out systematically.
• The free-running V-COIL system is useful when the repaired ren trong must remain reliably usable for standard screw connections.
• Process: manual or assisted drive depending on your tool holder and machine configuration.
• Use: cắt ren, re-tapping and làm sạch ren depending on the condition of the thread.

Lưu ý When selecting the kit, make sure that the thread system and thread design of the component clearly match the included UNF repair range and that all work steps are carried out in alignment with the existing hole.

• Coordinated repair kit for multiple UNF sizes in one set.
• Suitable for restoring load-bearing ren trong after damage or wear.
• Thread inserts made of stainless thép support a wear-resistant and corrosion-resistant thread solution.
• STI taps and installation tools are matched to the installation of the thread inserts.
• Useful for workshop, maintenance, assembly and component refurbishment.
• Can reduce scrap if damaged threads are repaired instead of replaced.

• A precise workflow is required for a clean repair, as alignment errors can impair thread quality.
• The kit is designed for the included UNF ranges and does not replace a universal solution for deviating thread systems or special applications. For those cases, see our threading tools.

1. Inspect the damaged ren trong and assign the component to the appropriate UNF version from the kit. Align the workpiece so that all machining steps are carried out cleanly in line with the axis of the existing hole.
2. Select the correct spiral drill and drill out the old thread in a controlled manner. Then clean the hole thoroughly so that the receiving thread can be produced cleanly.
3. Position the matching STI tap and cut the receiving thread in alignment. Use a suitable cutting medium and guide the tool in a controlled way.
4. Place the matching V-COIL thread insert onto the manual installation tool and screw it evenly into the prepared receiving thread. Position the insert so that the thread function in the component is professionally restored.
5. After installation, remove the driving tang using the appropriate tang breaker and check the finished thread for proper seating and function. This ensures that the repaired connection can be used reliably.

• 5 STI single-pass taps, Form D, HSS-G
  • 1 chiếc VÖLKEL 03155
  • 1 chiếc VÖLKEL 03156
  • 1 chiếc VÖLKEL 03157
  • 1 chiếc VÖLKEL 03158
  • 1 chiếc VÖLKEL 03159
• 5 tang breakers
  • 1 chiếc VÖLKEL 07009
  • 1 chiếc VÖLKEL 07011
  • 1 chiếc VÖLKEL 07013
  • 1 chiếc VÖLKEL 07014
  • 1 chiếc VÖLKEL 07015
• 5 manual installation tools with locking ring
  • 1 chiếc VÖLKEL 08009
  • 1 chiếc VÖLKEL 08011
  • 1 chiếc VÖLKEL 08013
  • 1 chiếc VÖLKEL 08014
  • 1 chiếc VÖLKEL 08015
• 95 thread inserts type S free-running length 1.5 D
  • 25 chiếc UNF 1/4" x 28
  • 25 chiếc UNF 5/16" x 24
  • 25 chiếc UNF 3/8" x 24
  • 10 chiếc UNF 7/16" x 20
  • 10 chiếc UNF 1/2" x 20
• 5 STI spiral drills
  • 1 chiếc 6.7 mm
  • 1 chiếc 8.3 mm
  • 1 chiếc 9.8 mm
  • 1 chiếc 11.5 mm
  • 1 chiếc 13.0 mm

• Product type: sửa ren kit
• System: V-COIL
• Thread system: UNF
• Thread type: ren trong repair with Ren cấy V-COIL
• Repair range: 1/4" to 1/2"
• Thread insert type: Type S free-running
• Insert length: 1.5 D
• Material of thread inserts: Stainless thép
• Included taps: STI single-pass taps Form D
• Tap design: HSS-G
• Additional components: Manual installation tools with locking ring, tang breakers and STI spiral drills

What is this kit intended for?
This kit is designed for repairing and reinforcing damaged UNF ren trong. It combines the required machining and installation tools in one coordinated set.

What does UNF mean for this product?
UNF stands for Unified National Fine and designates an inch fine thread. Compared to coarser series, it is often used wherever a finer thread pitch and a precise screw connection are required.

Why are STI taps required?
STI taps create the special receiving thread for the thread insert. They are therefore a central part of sửa ren and technically belong to sửa ren, not to the normal reworking of a standard thread.

What is the purpose of the thread insert?
The thread insert restores the thread function in the component and can additionally stabilize the connection in softer base materials. Thanks to the metallic insert structure, the screw connection remains durably usable.

Is this kit only suitable for repairs?
No, it can also be used for targeted thread reinforcement. This is especially useful when components are repeatedly screwed together or when the base material is more sensitive to thread wear.

What should I pay particular attention to during use?
Proper alignment, the correct matching of the components within the kit and controlled installation of the thread insert are essential. Only then can a load-bearing and functionally reliable sửa ren be achieved.

Where can I find further information about this product type?
VÖLKEL catalog as PDF