VÖLKEL Thread Repair Kits for spark plug threads, 8 x 1.25, 1,5 D

This product is a spark plug thread repair kit for restoring damaged spark plug thread seats for controlled thread repair in M 8 x 1.25. The kit logic matters because drilling or preparation, STI tapping, insert installation, and final checking must fit the same repair size.

VÖLKEL Thread Repair Kits for spark plug threads, 8 x 1.25,

Features and applications

This product is a spark plug thread repair kit for restoring damaged spark plug thread seats for controlled thread repair in M 8 x 1.25. The kit logic matters because drilling or preparation, STI tapping, insert installation, and final checking must fit the same repair size.

Metric thread selection is based on nominal diameter and pitch, so both values must match the screw connection or drawing. 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 M 8 x 1.25 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 M 8 x 1.25
• 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
• spark plug thread focus supports service repairs where the thread seat and installation depth must be controlled

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 M 8 x 1.25.
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.

• STI Machine Tap ISO 529 HSS-G - M 8 x 1.25: item 03631
• V-COIL Inserting Tool No. 11: item 08011
• Tang Break Tool No. 11: item 07011
• V-COIL Wire thread insert Free running type S M 8 x 1.25 - 1.5 D: item 07311

How to choose

Confirm M 8 x 1.25, the insert length, and every included tool before starting the repair.