Thread Repair Kits, UNC No. 8 x 32

• for repairing damaged or worn UNC internal threads No. 8 x 32
• for thread reinforcement in materials with low shear strength
• for recovering rejected components with damaged internal threads
• for creating new load-bearing internal threads with a stainless steel wire thread insert
• for service workshops, maintenance, assembly, metalworking and mechanical engineering
• Process: manual or assisted drive depending on your tool holder and machine configuration
• Use: thread cutting, thread reworking and thread cleaning depending on the condition of the thread

Note Before starting the repair, check whether the thread size, insert length and component wall thickness match the intended V-COIL repair.

• complete kit with STI tap, STI twist drill, installation tool, tang breaker and wire thread inserts
• stainless steel inserts improve the load capacity of the repaired internal thread
• Type S is free running and designed for standardized thread repair work
• DIN 8140 and ISO 2 (6H) support a repair process based on recognized standards
• plastic case keeps the kit components organized and ready for use
• suitable for manual repair work directly on components, fixtures or assemblies

• The repair requires a clean drilled hole and a correctly cut STI receiving thread, so the kit components should be used in the correct sequence.

1. Clean the damaged internal thread and remove loose particles so the drill can be guided correctly.
2. Drill out the damaged thread area with the STI twist drill included in the kit.
3. Cut the receiving thread with the STI tap and suitable cutting fluid.
4. Clean the cut receiving thread and remove chips completely.
5. Place the wire thread insert into the hand installation tool and align it straight to the thread.
6. Screw in the insert until it sits flush with or slightly below the component surface.
7. Remove the driving tang with the tang breaker.
8. Check the repaired internal thread with a suitable screw or an appropriate inspection tool.

• 1 piece STI single cut tap Form D HSS-G for UNC No. 8 x 32 (03104)
• 1 piece tang breaker No. 6 (07006)
• 1 piece hand installation tool with locking collar No. 6 (08006)
• 20 pieces wire thread inserts Type S free running for UNC No. 8 x 32 in 1.5D (08304)
• 1 piece STI twist drill 4.4 mm (00044)

• Product type: V-COIL thread repair kit
• Thread system: UNC
• Nominal size: UNC No. 8 x 32
• Insert length: 1.5D
• Insert type: Type S, free running
• Standard reference of inserts: DIN 8140
• Insert tolerance: ISO 2 (6H)
• Insert material: stainless steel
• Tap: STI single cut tap Form D HSS-G
• Drill: STI twist drill 4.4 mm
• Packaging: plastic case

What is this repair kit used for?
You use the kit to repair damaged UNC internal threads No. 8 x 32. The wire thread insert creates a new load-bearing internal thread in the prepared receiving thread.

What does UNC No. 8 x 32 mean?
UNC describes an inch-based coarse thread system. For correct selection, the thread designation of the component must match UNC No. 8 x 32.

Is this kit for internal or external threads?
The kit is intended for internal threads. External threads are not repaired directly with this wire thread insert process.

What is the function of the STI tap?
The STI tap cuts the receiving thread for the wire thread insert. This receiving thread is not identical to a standard screw thread.

Where can you find technical information about V-COIL thread repair?
You can find further technical information about the repair principle here: Technical information V-COIL thread repair as PDF.

Why is the correct STI twist drill important?
The STI twist drill prepares the damaged thread area for the receiving thread. An incorrect drill can prevent the wire thread insert from seating securely.

Where can you find information about wire thread inserts according to DIN 8140?
You can find information about wire thread inserts according to DIN 8140 here: Technical information wire thread inserts DIN 8140 as PDF.

What should you check before ordering?
Check the thread designation, required insert length and available installation space in the component. These points help prevent incorrect selection of the repair kit.

Where can you find the V-COIL catalogue?
You can find the catalogue for thread repair here: VC 23 catalogue as PDF.