Thread Repair Kits, UNF 7/16 - 1,5D

• rebuilding stripped or worn UNF 7/16 threads using an insert based repair sequence
• service cases where replacing the complete component is less practical than repairing the thread
• repeatable repair preparation using coordinated drilling, STI tapping, inserting, and checking steps
• tool room or field service work where all required kit parts must stay matched to the thread size

Note Confirm UNF 7/16, the insert length, and every included tool before starting the repair.

• kit structure keeps the repair workflow connected to UNF 7/16
• 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
• existing scope of supply data lists 5 component lines for this kit

• 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.

1. Compare UNF 7/16 with the component drawing or the original fastener before selecting the kit.
2. Remove contamination and damaged thread material from the repair area.
3. Use the preparation tool from the kit sequence while keeping the tool aligned with the original axis.
4. Tap the receiving thread with the matching STI tap from the repair system.
5. Clean the prepared thread before the insert touches the component.
6. Drive the insert into the thread with the installation tool specified for the kit.
7. Finish the installation step by removing the tang if required.
8. Verify smooth screw engagement and document the repair where your process requires traceability.

Kit components

• 1x STI-Short Machine Taps, ForD, HSS-G, UNF 7/16 x 20 VÖLKEL 03158
• 1x Tang Break Tools, No. 14 VÖLKEL 07014
• 1x Inserting tool with locking ring, No. 14 VÖLKEL 08014
• 10x Wire thread inserts - type S - free running UNF 7/16 x 20 – 1.5 D
• 1 piece STI Twist drill 11.5 mm

• Product type: thread repair kit
• Thread repair system: V-COIL
• Thread designation: UNF 7/16
• Insert length: 1.5D
• Listed component lines: 5

When do you use a thread repair kit instead of a refill pack?

Use a kit when the repair tools and inserts must be available together for the selected thread size or size range.

Which thread does this kit address?

This kit addresses UNF 7/16. UNF identifies a Unified fine inch thread used on inch based fasteners where a finer pitch is specified.

How do you choose the correct component from the kit?

Follow the repair sequence: preparation tool first, STI tap second, insert and inserting tool third, tang or finishing tool only when the insert type requires it.

What should be checked before drilling or preparing the hole?

Check alignment to the original thread axis, remaining wall material, and whether the damaged component can be repaired without shifting the screw position.

Where can you find V-COIL thread repair technical information?

Use the Technical information V-COIL thread repair as PDF.

How do you identify replacement components when links are present?

Use the linked component article number in Scope of supply and match it to the same repair size and tool function.

What is the main risk during installation?

Misalignment during preparation or insertion can damage the new receiving thread, so the tool path must follow the original thread axis.

Where can you find the VÖLKEL thread repair catalog?

Use the VC 23 catalog as PDF.