V-COIL Wire thread insert Free running type S UNx8 1.1/8 x 8 - 1.5 D (5 pcs.)

• Repair damaged internal threads with a V-COIL free running type S insert after the base material has been prepared with the matching STI thread.
• Use the insert for UNx8 1.1/8 x 8 repairs where the thread designation and insert length 1.5 D match the component requirement.
• Apply the pack in industrial maintenance, mechanical service, and rework when the original part should remain in service.
• Use free running type S when the repaired internal thread should accept the fastener without an additional locking effect from the insert.
• Process: manual driving or assisted driving depending on your holder and machine setup
• Use: thread cutting, re tapping, and thread cleaning depending on condition

Note Prepare the STI thread with matching V-COIL tooling and check the installed insert before the repaired part returns to service.

• The insert restores the UNx8 1.1/8 x 8 internal thread while keeping the original fastening system unchanged.
• The 1.5 D insert length gives a defined selection criterion for repair depth and thread engagement planning.
• Stainless steel construction supports a wear resistant repaired thread interface.
• DIN 8140 reference data supports standardized wire thread insert selection.

• The repair requires correct drilling, STI tapping, and insert installation before the thread can be used again.
• The insert cannot correct misalignment, cracked base material, or a repair bore that was prepared incorrectly.

1. Confirm that the damaged internal thread matches UNx8 1.1/8 x 8.
2. Remove damaged thread material and burrs from the repair position.
3. Drill the damaged thread according to the V-COIL repair process.
4. Cut the STI receiving thread with the matching STI tap and keep the tool aligned with the bore axis.
5. Clean the prepared thread so chips and loose material do not remain in the repair position.
6. Install the wire thread insert with the matching installation tool.
7. Seat the insert to the required depth without forcing the first thread turns.
8. Remove the tang or drive feature when the insert type and repair process require that action.
9. Verify the repaired thread with the intended fastener or a suitable inspection method.

• 5 pieces V-COIL Wire thread insert Free running type S UNx8 1.1/8 x 8 - 1.5 D (5 pcs.)

• Product type: Wire thread insert
• System: V-COIL thread repair
• Insert behavior: Free running type S
• Standard: DIN 8140
• Material: Stainless steel
• Tolerance: 2B
• Thread standard: ANSI B 1.1
• Thread system: Unified inch thread with eight threads per inch
• Thread designation: UNx8 1.1/8 x 8
• Insert length: 1.5 D
• Pack quantity: 5 pieces

When is this V-COIL insert the correct repair choice?

Use this insert when the damaged internal thread matches UNx8 1.1/8 x 8 and the component can be prepared with the matching STI thread for a wire thread insert repair.

What does the thread designation tell you before ordering?

Unified inch thread with eight threads per inch and UNx8 1.1/8 x 8 define the thread series and size you must match to the drawing, sample thread, or fastener before you select the insert.

Where can you find the V-COIL repair process overview?

Technical information V-COIL thread repair as PDF

Why is the STI preparation thread important?

The STI preparation thread is the receiving thread for the insert, so the insert can seat correctly and create the repaired internal thread geometry.

Where can you find technical information on DIN 8140 wire thread inserts?

Technical information wire thread inserts DIN 8140 as PDF

How do you choose between free running type S and screw locking type SL?

Choose free running type S for a repaired thread without insert based locking behavior and choose screw locking type SL only when the assembly requires that locking effect.

What should you check after installing the insert?

Check that the insert sits at the required depth, the first thread turns are clean, and the intended fastener engages smoothly without binding.

Where can you find more V-COIL product and application information in a catalog?

VC 23 catalog as PDF