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BIG-SERT® Oversize Thread Repair Inserts M5–M12 Metric – TIME-SERT®
Price range: £11.83 through £66.80
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BIG-SERT solid threaded inserts provide a heavy-duty solution for restoring severely damaged or previously repaired metric threads.
- Ideal for repairing severely damaged or previously repaired threaded holes.
- Oversized solid steel construction provides a strong, durable repair.
- Flanged design ensures accurate positioning within the workpiece.
- Self-locking installation provides a secure, long-lasting fit.
- Restores the original internal thread size without requiring oversized fasteners.
Order your BIG-SERT metric inserts today for a strong, secure and reliable thread repair solution!
Need the installation tools?
Shop BIG-SERT Metric Thread Repair Kits →
Description
BIG-SERT® Oversize Thread Repair Inserts M5–M12 Metric – TIME-SERT®
BIG-SERT® Oversize Thread Repair Inserts by TIME-SERT® are precision-engineered solid steel bushings designed to restore stripped, enlarged or previously repaired metric threads. Featuring a positive seating flange and self-locking installation design, these heavy-duty inserts provide a durable repair where standard thread inserts are no longer suitable. Available in M5 to M12 metric sizes with multiple thread pitches and insert lengths for professional automotive, engineering and mechanical repairs. Choose a single insert or a pack of five.
Professional Oversize Thread Repair for Damaged & Previously Repaired Holes
BIG-SERT® is the oversize thread repair system developed by TIME-SERT® for damaged threaded holes where conventional repair inserts may no longer provide a suitable solution. The solid bushing design restores the original internal bolt thread while providing a larger external thread for the repaired hole.
Each insert features an integrated flange for positive seating and a mechanical self-locking system. During installation, the dedicated BIG-SERT driver expands the lower insert threads into the surrounding material, securing the insert in position.
For standard first-time thread repairs, explore our TIME-SERT metric thread repair inserts or browse our TIME-SERT metric thread repair kits for complete standard-size repair systems.
Key Features
- Oversize Repair Design – Suitable for enlarged or previously repaired threaded holes.
- Solid Steel Construction – Durable threaded bushings for demanding mechanical repairs.
- Positive Seating Flange – Provides controlled placement and installation depth.
- Self-Locking Technology – Lower threads expand during installation for secure mechanical retention.
- Multiple Metric Sizes – M5 to M12 with different pitches and lengths, available individually or in packs of five.
Technical Specifications
- M5–M12Metric Thread Range
- Solid SteelConstruction
- FlangedPositive Seating
- Self-LockingInstallation Design
| Specification | Value |
|---|---|
| Brand | TIME-SERT® |
| Product Range | BIG-SERT® |
| Product Type | Oversize Solid Thread Repair Insert |
| Material | Steel |
| Internal Thread | Metric M5 to M12 |
| Internal Thread Pitches | 0.8, 1.0, 1.25, 1.5 & 1.75mm |
| Outside Thread Pitch | 1.0mm or 1.5mm, Depending on Size |
| Outside Diameter | 7mm to 15.8mm, Depending on Size |
| Insert Length | Varies by Selected Size |
| Insert Design | Flanged Solid Bushing |
| Locking Method | Mechanical Expansion During Installation |
| Installation Tools | Compatible BIG-SERT Tooling Required |
| Pack Quantity | 1 Insert or 5 Inserts |
| Condition | New |
Available Thread Sizes, Insert Lengths & Outside Dimensions
Select the required internal thread size, pitch and insert length for your repair. The table below shows the nominal outside diameter (OD) and outside thread pitch for each insert size. All measurements are in millimetres.
| Internal Thread (ID × Pitch) | Available Lengths (mm) | Outside Diameter (OD mm) | Outside Thread Pitch (mm) |
|---|---|---|---|
| M5 × 0.8 | 7.6, 10 | 7.00 | 1.0 |
| M6 × 1.0 | 9.4, 12 | 8.00 | 1.0 |
| M7 × 1.0 | 10 | 10.00 | 1.0 |
| M8 × 1.0 | 11.7 | 11.65 | 1.5 |
| M8 × 1.25 | 11.7, 16.2, 18 | 11.65 | 1.5 |
| M10 × 1.0 | 9, 15 | 13.70 | 1.5 |
| M10 × 1.25 | 14, 20, 24.5 | 13.70 | 1.5 |
| M10 × 1.5 | 9.4, 11, 14, 20, 24.5, 30 | 13.70 | 1.5 |
| M11 × 1.5* | 30 | 15.70 | 1.5 |
| M12 × 1.25 | 9, 15, 17.5, 24, 30 | 15.80 | 1.5 |
| M12 × 1.5 | 9, 16.2, 24, 30 | 15.80 | 1.5 |
| M12 × 1.75 | 12, 16.2, 24, 30 | 15.80 | 1.5 |
*Verification Required: The M11 × 1.5 entry requires confirmation because the supplied technical image contains an inconsistent thread label for the 15.70mm outside diameter row.
Important: The outside diameter refers to the insert body and must not be used as the drilling diameter. Always use the appropriate BIG-SERT installation kit and manufacturer instructions.
Why Choose BIG-SERT® Oversize Thread Repair Inserts?
Oversize Repair Capability
Designed for enlarged or previously repaired threaded holes where standard inserts may no longer be suitable.
Durable Solid Bushing
Solid steel construction restores a usable internal thread while retaining the original bolt diameter and pitch.
Positive Flange Placement
The integrated flange provides accurate seating and controlled positioning during installation.
Mechanical Self-Locking
The dedicated installation driver expands the lower insert threads to secure the bushing within the repaired component.
Typical Applications
- Stripped or severely damaged metric threads.
- Previously failed thread insert repairs.
- Enlarged holes requiring an oversize repair solution.
- Automotive engine and mechanical component repairs.
- Engineering and industrial machinery maintenance.
- Thread restoration retaining the original bolt specification.
Available Pack Quantities
Choose your required insert size and pack quantity using the product options above.
| Pack Option | Contents |
|---|---|
| 1 Insert | One BIG-SERT insert in your selected thread size and length. |
| 5 Inserts | Five identical BIG-SERT inserts in your selected thread size and length. |
Please Note: Each pack contains only the selected insert size and length. Different sizes are not mixed within a pack.
Installation & Important Information
- Identify the original internal thread size, pitch and required insert length.
- Confirm the available material and hole dimensions are suitable for the BIG-SERT system.
- Prepare the damaged hole using the specified BIG-SERT drilling and counterboring tools.
- Cut the required thread using the dedicated BIG-SERT tap.
- Install the insert using the compatible BIG-SERT driver and manufacturer’s procedure.
- Complete the locking operation and inspect the finished thread.
Important: BIG-SERT inserts require the correct oversize installation tooling. Standard TIME-SERT tools and conventional taps must not be assumed interchangeable.
What’s Included: One or five genuine BIG-SERT oversize thread repair inserts, depending on your selected pack quantity. Installation tools and kits are not included. A VAT invoice is supplied with your order.
Complete Your Thread Repair
For standard-size repairs, explore our TIME-SERT metric thread repair inserts and TIME-SERT metric thread repair kits.
These standard-size alternatives are suitable where an oversize BIG-SERT repair is not required. Customers carrying out an oversize repair should ensure they have the correct BIG-SERT installation kit and compatible tooling.
Frequently Asked Questions
What is the difference between TIME-SERT and BIG-SERT?
TIME-SERT is generally used for standard solid-bushing thread repairs, while BIG-SERT is an oversize system developed for enlarged holes and certain previously failed repairs.
Can BIG-SERT repair a failed Helicoil?
It may be suitable where a previous coil-type insert has failed, provided the remaining hole dimensions and surrounding material are compatible with the selected BIG-SERT system.
Is the outside diameter the drill size?
No. The outside diameter identifies the insert body. The required drilling and tapping dimensions must be taken from the relevant BIG-SERT installation instructions.
Are installation tools included?
No. This listing is for BIG-SERT inserts only. Compatible installation tooling must be purchased separately.
How many inserts will I receive?
You can select either 1 Insert or 5 Inserts. Packs of five contain five identical inserts in your chosen thread size, pitch and length.
Why Shop with Ace Consumables?
25+ Years of Experience
Professional tools and consumables backed by over 25 years of industry expertise.
Fast & Reliable Shipping
Reliable UK delivery options for professional workshops and trade customers.
Rated Excellent
Read customer feedback on our Trustpilot page.
Restore damaged or previously repaired threads with BIG-SERT® Oversize Thread Repair Inserts by TIME-SERT®. Featuring solid steel construction, positive flange seating and mechanical self-locking technology, these professional inserts are available in M5 to M12 metric sizes. Choose your required thread size, pitch, insert length and pack quantity, then order from Ace Consumables today.
Additional information
| Size x Pitch x length | M5 x 0.8 x 7.6 mm, M5 x 0.8 x 10 mm, M6 x 1.0 x 9.4 mm, M6 x 1.0 x 12 mm, M7 x 1.0 x 10 mm, M8 x 1.0 x 11.7 mm, M8 x 1.25 x 11.7 mm, M8 x 1.25 x 16.2 mm, M8 x 1.25 x 18 mm, M10 x 1.0 x 9 mm, M10 x 1.0 x 15 mm, M10 x 1.25 x 14 mm, M10 x 1.25 x 20 mm, M10 x 1.25 x 24.5 mm, M10 x 1.5 x 9.4 mm, M10 x 1.5 x 11 mm, M10 x 1.5 x 14 mm, M10 x 1.5 x 20 mm, M10 x 1.5 x 24.5 mm, M10 x 1.5 x 30 mm, M11 x 1.5 x 30 mm, M12 x 1.25 x 9 mm, M12 x 1.25 x 15 mm, M12 x 1.25 x 17.5 mm, M12 x 1.25 x 24 mm, M12 x 1.25 x 30 mm, M12 x 1.5 x 9 mm, M12 x 1.5 x 16.2 mm, M12 x 1.5 x 24 mm, M12 x 1.5 x 30 mm, M12 x 1.75 x 12 mm, M12 x 1.75 x 16.2 mm, M12 x 1.75 x 24 mm, M12 x 1.75 x 30 mm |
|---|---|
| Pack Quantity | 1 Insert, 5 Inserts |
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