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Repair kit with HSS drill, tap and installation tool for thread restoration.
Internal thread repair kit with V-COIL tools and inserts in a plastic case.
Metal drill with spiral flutes for V-COIL STI thread repair systems
STI tap by V-COIL for preparing holes for thread inserts.
Durable V-COIL thread inserts for restoring damaged threads in mechanical components.
V-COIL hand tool with blue handle and black shaft for thread repair
Specialized V-COIL tool for breaking drive tangs.
Repair kit with HSS drill, tap and installation tool for thread restoration.
Internal thread repair kit with V-COIL tools and inserts in a plastic case.
Metal drill with spiral flutes for V-COIL STI thread repair systems
STI tap by V-COIL for preparing holes for thread inserts.
Durable V-COIL thread inserts for restoring damaged threads in mechanical components.
V-COIL hand tool with blue handle and black shaft for thread repair
Specialized V-COIL tool for breaking drive tangs.
Thread Repair Kits

Thread Repair Kits, UNC No. 4 x 40

Item no. 04101

€28.50

in stock - more than 100 pieces available
Application
V-COIL Thread Repair Kit UNC No. 4 × 40 | Stainless Steel Wire Inserts DIN 8140

V-COIL Thread Repair Kit UNC No. 4 × 40

With the V-COIL Thread Repair Kit UNC No. 4 × 40 you can quickly and precisely repair damaged or worn UNC internal threads. The complete kit contains all the tools you need for a reliable and durable repair — ideal for maintenance, workshop use or small series production.

Your Advantages & Applications
  • Restore UNC No. 4 × 40 threads easily and permanently
  • Reinforce threads in materials with low shear strength
  • Create strong, corrosion-resistant internal threads
  • Perfect for metals, plastics and aluminum components
  • Delivered in a compact, durable plastic case – always ready to use

Your benefit: a fast, durable repair without reworking the component.

Step-by-Step Instructions
  1. Preparation: Clean the damaged thread and pre-drill it with the 3.1 mm twist drill.
  2. Tapping: Cut the new STI thread with the HSS-G tap UNC No. 4 × 40 using cutting oil.
  3. Inserting: Screw in the stainless steel insert using the inserting tool until it sits flush.
  4. Breaking the tang: Use the tang break tool to remove the driving tang.
  5. Check: Test the repaired thread with a suitable screw.

Technical Data
  • Brand: V-COIL
  • Nominal Size: UNC No. 4 × 40
  • Repair Length: 1.5D
  • Material: Stainless Steel
  • Packaging: Plastic Case
  • EAN: 4022835041016
  • Article Number: 04101

Kit Contents
  • 1× STI Short Machine Tap, HSS-G, UNC No. 4 × 40 (03101)
  • 1× Tang Break Tool, No. 4 (07004)
  • 1× Inserting Tool with Locking Ring, No. 4 (08004)
  • 20× Wire Thread Inserts – Type S – Free Running UNC No. 4 × 40 – 1.5 D (08301)
  • 1× STI Twist Drill 3.1 mm (00031)

FAQ – Frequently Asked Questions

Can I use this kit for aluminum?
Yes, the stainless steel inserts are perfect for soft materials like aluminum or plastic.

What does 1.5D mean?
The insert length is 1.5 times the nominal thread diameter, ensuring high load capacity.

Is the drill included?
Yes, the matching 3.1 mm STI twist drill is included in the kit.

Do I need any special tools?
No, everything required is included in the set – you can perform the repair manually.

How long will the repair last?
Properly installed inserts provide a permanent and wear-resistant repair.

Are other sizes available?
Yes, V-COIL offers kits for all common UNC and UNF thread sizes.

Need replacement inserts or special sizes?
Contact us easily via the contact form.

Additional information
Material Wire Thread Inserts frostainless steel
Size Diameter UNC No. 4 x 40
Packing in plastic case
EAN 4022835041016
Item number 04101
V-COIL Thread Repair Kit UNC No. 4 × 40 | Stainless Steel Wire Inserts DIN 8140

V-COIL Thread Repair Kit UNC No. 4 × 40

With the V-COIL Thread Repair Kit UNC No. 4 × 40 you can quickly and precisely repair damaged or worn UNC internal threads. The complete kit contains all the tools you need for a reliable and durable repair — ideal for maintenance, workshop use or small series production.

Your Advantages & Applications
  • Restore UNC No. 4 × 40 threads easily and permanently
  • Reinforce threads in materials with low shear strength
  • Create strong, corrosion-resistant internal threads
  • Perfect for metals, plastics and aluminum components
  • Delivered in a compact, durable plastic case – always ready to use

Your benefit: a fast, durable repair without reworking the component.

Step-by-Step Instructions
  1. Preparation: Clean the damaged thread and pre-drill it with the 3.1 mm twist drill.
  2. Tapping: Cut the new STI thread with the HSS-G tap UNC No. 4 × 40 using cutting oil.
  3. Inserting: Screw in the stainless steel insert using the inserting tool until it sits flush.
  4. Breaking the tang: Use the tang break tool to remove the driving tang.
  5. Check: Test the repaired thread with a suitable screw.

Technical Data
  • Brand: V-COIL
  • Nominal Size: UNC No. 4 × 40
  • Repair Length: 1.5D
  • Material: Stainless Steel
  • Packaging: Plastic Case
  • EAN: 4022835041016
  • Article Number: 04101

Kit Contents
  • 1× STI Short Machine Tap, HSS-G, UNC No. 4 × 40 (03101)
  • 1× Tang Break Tool, No. 4 (07004)
  • 1× Inserting Tool with Locking Ring, No. 4 (08004)
  • 20× Wire Thread Inserts – Type S – Free Running UNC No. 4 × 40 – 1.5 D (08301)
  • 1× STI Twist Drill 3.1 mm (00031)

FAQ – Frequently Asked Questions

Can I use this kit for aluminum?
Yes, the stainless steel inserts are perfect for soft materials like aluminum or plastic.

What does 1.5D mean?
The insert length is 1.5 times the nominal thread diameter, ensuring high load capacity.

Is the drill included?
Yes, the matching 3.1 mm STI twist drill is included in the kit.

Do I need any special tools?
No, everything required is included in the set – you can perform the repair manually.

How long will the repair last?
Properly installed inserts provide a permanent and wear-resistant repair.

Are other sizes available?
Yes, V-COIL offers kits for all common UNC and UNF thread sizes.

Need replacement inserts or special sizes?
Contact us easily via the contact form.

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