VÖLKEL Thread Repair Kits, UNC 1.1/4 - 1,5D

Use this thread repair kit for restoring a damaged internal thread with wire thread inserts when a damaged internal thread must be rebuilt rather than only cleaned. The decisive selection points are repair size UNC 1, insert length where stated, and the tools included in the kit.

VÖLKEL Thread Repair Kits, UNC 1.1/4 - 1,5D

Features and applications

Use this thread repair kit for restoring a damaged internal thread with wire thread inserts when a damaged internal thread must be rebuilt rather than only cleaned. The decisive selection points are repair size UNC 1, insert length where stated, and the tools included in the kit.

UNC identifies a Unified coarse inch thread used on inch based fasteners and must be matched to the stated thread series. The kit should be selected by the component thread, available wall thickness, and the required installation workflow. Check the thread designation, tool stage, holder guidance, lubrication, and inspection method before work starts.

Applications

• repairing damaged internal UNC 1 threads with the V-COIL repair process
• workshop and maintenance repairs where the original screw size should remain usable
• component repair in housings, covers, brackets, flanges, and similar metal parts
• selection by thread size, insert length, included tools, and required inspection method

Benefits

• kit structure keeps the repair workflow connected to UNC 1
• coordinated preparation, STI tapping, insertion, and checking steps reduce the risk of mixing tools from different sizes
• insert repair can retain the original screw size when the component condition allows controlled preparation

Application limits

• A repair kit only works when the damaged component can be prepared correctly; replace the component or use a different repair method if alignment or remaining wall strength is not sufficient.

Step by step

1. Identify the damaged thread and confirm that the kit is the correct repair size for UNC 1.
2. Secure the component so the preparation tool can follow the original thread axis.
3. Prepare the damaged hole with the drilling or cleaning step required by the kit workflow.
4. Cut the STI receiving thread with the included or specified repair tap.
5. Clean the hole and remove chips before the insert is installed.
6. Install the wire thread insert with the correct inserting tool until the seating position is reached.
7. Remove the tang where the selected insert system requires that step.
8. Check the repaired thread with the mating screw or inspection method used in your process.

Used together with

Each component in the kit has its own VÖLKEL item number for reordering.

• V-COIL Inserting Tool (Drive connector 1/2") UNC 1.1/4: item 08051
• V-COIL Wire thread insert Free running type S UNC 1.1/4 x 7 - 1.5 D: item 08321

How to choose

Confirm UNC 1, the insert length, and every included tool before starting the repair.