Single-Size · Metric / UNC / UNF · Refill · Industrial · OEM Supply
Thread Repair Kits with Wire Thread Inserts
Taiyi manufactures and supplies thread repair kits with wire thread inserts, matched STI taps and installation tools for repairing stripped or damaged internal threads. Choose single-size or assorted Metric, UNC and UNF configurations for industrial maintenance, distributor resale and OEM programs.
Complete kits, refill insert packs and private-label assortments can be configured with the required drill or hole-preparation tools, taps, installation tools, tang-break tools, extractors, cases and instructions. Send your size list and target quantity for a technical and wholesale quotation.
Quick Kit Selection
Which Thread Repair Kit Do You Need?
Start from the repair situation and existing tool inventory. A buyer who already owns the correct STI taps and installation tools does not need the same kit format as a first-time repair user or distributor building a retail range.
Kit Formats
Thread Repair Kit Options for Different Buyers
The appropriate kit structure depends on the user, thread-size range, expected repair frequency, packaging channel and repeat-order plan.
Single-Size Repair Kit
One thread size with the matched drill bit, STI tap, installation tool, tang tool and a defined quantity of inserts.
- M6, M8, M10 or another specified size
- Defined pitch and insert length
- Compact case for targeted repairs
Assorted Metric Kit
Multiple metric thread sizes supplied in one organized case for workshops, maintenance teams and distributor resale.
- Size range selected by the buyer
- Insert quantity defined by size
- Matched tools and size identification
Refill Insert Packs
Replacement insert packs for buyers who already have compatible drill bits, STI taps and installation tools.
- Insert size and pitch
- Insert length and type
- Pack quantity and label
OEM Retail Kit
Retail-ready kit configuration for distributors, brands and industrial resellers requiring their own packaging identity.
- Logo and label artwork
- Barcode and item code
- Instruction sheet and case layout
Industrial Bulk Kit
Higher insert quantities, spare tools and replacement packs for factories, repair teams and frequent maintenance operations.
- Higher insert count per size
- Spare taps or installation tools
- Planned refill inventory
Custom Kit Configuration
Mixed specifications, non-standard case layouts or specialized component combinations can be reviewed from a drawing, sample or complete component list.
- Technical feasibility review
- Component sourcing confirmation
- Physical sample approval
Wholesale & OEM Thread Repair Kits
Bulk Kit Supply for Industrial Distributors and Private-Label Brands
Request single-size kits, assorted Metric / UNC / UNF repair kits, refill packs or buyer-defined kit configurations. We can review custom component counts, distributor SKU labels, branded cases, instruction sheets and repeat-order requirements. Pricing, MOQ and delivery are confirmed against the approved specification and quantity.
Complete Repair System
What Should a Complete Wire Insert Repair Kit Include?
A complete kit should be evaluated as one matched repair system. Exact contents vary by thread size, insert design, hole-preparation method and buyer requirement; not every kit needs every component below.
Wire Thread Inserts
Confirm thread standard, nominal size, pitch or TPI, insert length, free-running or locking function, tanged or tangless design, material and quantity per kit.
View wire thread inserts →
Hole Preparation & STI Tap
The drill or hole-preparation requirement and STI tap must match the insert system. A standard tap is not a substitute for the required STI receiving thread.
View STI taps →
Installation, Tang & Removal Tools
Installation mandrels, tang-break tools and extractors must match the insert design, thread size, hole access and repair workflow.
View installation tools →Swipe horizontally to view the full table →
| Kit Component | Complete Kit | When It May Be Optional | Buyer Check |
|---|---|---|---|
| Wire Inserts | Required | Not optional | Size, pitch/TPI, length, type, quantity |
| Drill / Hole-Preparation Tool | Commonly specified | May depend on size, repair condition or buyer tool inventory | Approved receiving-hole preparation |
| STI Tap | Required for a complete wire-insert repair workflow | Can be omitted from refill-only programs | Exact thread standard and pitch/TPI |
| Installation Tool | Normally included in a complete kit | May be omitted for buyers with an approved existing tool | Tanged/tangless compatibility |
| Tang-Break Tool | Included when required | Not used for tangless inserts; application may not require tang removal | Insert design, access and tang-control requirement |
| Extractor | Optional / premium | May be omitted from basic repair kits | Correction and service requirement |
| Case / Labels / Instructions | Specified by buyer | May be simplified for industrial bulk use | Channel, branding, language and refill structure |
Metric single-size and assortment kits
Common Metric Thread Repair Kit Sizes: M5, M6, M8, M10 & M12
Choose the finished screw-thread size and pitch before selecting the STI tap, insertion tool and insert lengths. These are common metric coarse-thread examples for industrial repair kit sourcing, not a claim that every kit or component is stocked as a fixed SKU. Fine-thread and drawing-specific configurations can also be quoted.
Swipe horizontally to compare common kit specifications.
| Finished Thread | Pitch | Typical Insert Length Options | Kit Selection or Detail |
|---|---|---|---|
| M5 × 0.8 | 0.8 mm | 1D / 1.5D / 2D | Single-size repair kit or metric assortment component |
| M6 × 1.0 | 1.0 mm | 1D / 1.5D / 2D | M6 insert and repair details → |
| M8 × 1.25 | 1.25 mm | 1D / 1.5D / 2D | M8 insert and repair details → |
| M10 × 1.5 | 1.5 mm | 1D / 1.5D / 2D | Match tool and kit BOM to the specified pitch |
| M12 × 1.75 | 1.75 mm | 1D / 1.5D / 2D | M12 insert and kit options → |
Metric and Inch Repair Kits
Metric, UNC and UNF Thread Repair Kits
Thread standard must be defined before kit assembly because the insert, STI tap, drill or hole-preparation requirement and installation tool all depend on the same thread system.
Metric Thread Repair Kits
Single-size and multi-size metric kits can be configured by nominal size, pitch, insert length, insert type, tool allocation and refill structure.
UNC Thread Repair Kits
Unified coarse kits should specify the exact inch thread designation, TPI, insert length, tanged/tangless system and complete tool package.
UNF Thread Repair Kits
Unified fine kits require the exact fine-thread TPI and matched insert, STI tap and installation tooling. Do not substitute UNC components.
Custom Insert Material Options
Stainless Steel and Special-Alloy Inserts for Thread Repair Kits
The wire thread inserts inside a repair kit can be specified by alloy as well as thread size. The STI tap, drill and installation tools remain separately selected for tool compatibility; specifying an alloy for the insert does not mean that every tool in the kit uses that alloy.
Stainless Steel Wire Inserts
Standard and customer-specified stainless steel grades, including 201, 301, 304 and 316, can be reviewed according to the intended application.
Inconel X-750 Inserts
Quote requests may specify Alloy X-750 (UNS N07750) for selected high-temperature applications. Wire sourcing, forming and finished-part requirements are checked per order.
Nitronic 60 and Nimonic 90
Material-specific requests involving Nitronic 60 (UNS S21800) or Nimonic 90 (UNS N07090) can be evaluated for the insert component.
Phosphor Bronze and Other Alloys
Phosphor bronze, selected titanium alloys and other buyer-specified wire materials can be discussed when drawings, dimensions and quantities are provided.
Need a specific alloy? Browse the Wire Thread Insert Materials Guide for additional international material names. Include the exact alloy grade or UNS number, insert specification and certificate requirement in your RFQ. Special-alloy availability, suitability and documentation are confirmed before an order is accepted.
Request a Custom-Material Kit QuoteConfiguration Matrix
What Must Be Confirmed Before Building the Kit
A complete component specification is required before pricing, sample assembly or private-label artwork approval.
| Configuration Item | Buyer Should Confirm | Why It Matters | Status Before Quote |
|---|---|---|---|
| Thread standard | Metric, UNC, UNF or another specified thread system. | Controls all matched insert, drill and STI tap specifications. | Required |
| Size and pitch | Nominal diameter with metric pitch or inch TPI. | Prevents coarse/fine-thread and diameter mismatches. | High risk if missing |
| Insert length | 1D, 1.5D, 2D, 2.5D, 3D or reviewed custom length. | Affects engagement depth, insert count and case identification. | Must define |
| Insert type | Free-running, screw-locking, tanged or tangless. | Changes installation tooling and tang-handling requirements. | Application review |
| Insert material | Stainless steel 201, 301, 304, 316, Inconel X-750, Nitronic 60 or another customer-specified wire insert alloy after review. | Affects availability, application suitability, price and documents. | Confirm before quote |
| Tool package | Drill bit, STI tap, installation tool, tang tool and extractor. | Determines whether the kit provides a complete repair workflow. | Matched as a system |
| Insert quantity | Quantity per size and planned refill-pack quantity. | Affects case layout, labels, packing cost and resale value. | Commercial requirement |
| Packaging | Plastic or metal case, trays, bags, dividers and outer carton. | Defines presentation, protection, shipping weight and tooling layout. | Sample approval |
| Branding | Logo, label, item code, barcode, manual and language. | Must be approved before printed packaging or bulk assembly. | OEM requirement |
| Documents | Material certificate, inspection record or specified document. | Documents must be coordinated with the production batch and order size. | Production orders |
Repair kits for aluminum components
Choosing a Thread Repair Kit for Aluminum & Stripped Threads
A helical wire insert repair kit can restore a specified internal screw thread in suitable aluminum parts, provided the remaining parent material, hole geometry, loading and access are appropriate. The insert is typically a different material from the aluminum component: specify the mating screw, parent metal, exposure conditions and insert alloy rather than assuming every kit works in every aluminum housing.
Damaged aluminum bolt hole
Record the original metric or UNC/UNF thread, measure the damage and check wall thickness and usable depth. Match the kit drill guidance, STI tap and insert to the approved repair system.
Repeated assembly or softer parent metal
Wire thread inserts can be specified for thread reinforcement when the assembly design permits. Choose the required pitch, installed length and fastener engagement against the engineering drawing.
Oversized or previously repaired hole
Do not assume a standard wire insert kit can repair every enlarged or fractured hole. Confirm remaining material and allowable STI thread size; a different insert system or engineered repair may be needed.
Kit Size Strategy
Single-Size vs Multi-Size Thread Repair Kits
More sizes do not automatically make a better kit. The correct assortment should follow the actual repair market, customer equipment and repeat-order pattern.
Single-Size Repair Kit
- Built around one exact nominal thread and pitch/TPI.
- Clear tool-to-insert matching.
- Efficient for known repairs and dedicated service programs.
- Easier refill planning for one controlled SKU.
- Suitable for distributor products built around common high-demand sizes.
Multi-Size Assortment Kit
- Combines multiple sizes in one organized case.
- Useful for workshops, maintenance teams and broad distributor ranges.
- Each size still needs its own matched insert and tool specification.
- Case layout and identification become more important.
- Size selection should follow real repair demand rather than maximum count.
Repeat Purchase Structure
Complete Repair Kit vs Refill Insert Pack
Complete kits solve the first repair-tool requirement. Refill packs support the repeat-order cycle after the buyer already owns the correct tooling.
Swipe horizontally to view the full table →
| Item | Complete Kit | Refill Pack | Commercial Role |
|---|---|---|---|
| Wire Inserts | Yes | Yes | Core consumable |
| STI Tap | Normally specified | No | Initial tool purchase / replacement tool if worn |
| Installation Tool | Normally specified | No | Reusable tool |
| Drill / Hole Preparation | Depends on kit | No | Reusable or replaceable tool |
| Tang Tool / Extractor | If required | No | Reusable service tool |
| Primary Buyer | First-time repair user, workshop, distributor | Existing tool owner | Defines initial sale vs repeat purchase |
| Repeat Order Frequency | Usually lower | Usually higher | Refill SKU planning supports recurring sales |
Insert System
Tanged vs Tangless Thread Repair Kits
Tanged and tangless kits use different installation systems. The kit must be built around the actual insert design rather than assuming the tools are interchangeable.
Tanged Repair Kit
- Tanged wire inserts.
- Matched STI tap and hole-preparation requirement.
- Tanged installation mandrel or prewinder.
- Tang-break tool when tang removal is required.
- Extractor or service tool if specified.
Tangless Repair Kit
- Tang-free / tangless-style wire inserts.
- Matched STI tap and hole-preparation requirement.
- Dedicated compatible tangless installation tool.
- No break-off tang tool in the normal tangless workflow.
- Existing-system compatibility review when replacing a branded system.
Industrial Kit Design
Basic Assortment vs Professional / Industrial Repair Kit
Professional kits should be evaluated by specification control, refill planning, tool durability, spare-part support and sample approval rather than by component count alone.
Swipe horizontally to view the full table →
| Check | Basic Assortment | Professional / Industrial Kit | Buyer Value |
|---|---|---|---|
| Insert Identification | Often basic size labeling | Controlled SKU, size, pitch, length and type identification | Reduces wrong-part selection |
| STI Tap Specification | Must be verified | Matched and controlled against the insert system | Reduces incomplete repair sets |
| Tool Durability | General-purpose | Selected for repeat workshop or production-adjacent use | Better fit for frequent repair cycles |
| Spare Parts | May be limited | Replacement taps, mandrels, tang tools or extractors can be planned | Lower downtime |
| Refill SKU | May be unclear | Defined refill insert packs by size and length | Supports repeat purchase |
| Case Layout | Generic | Buyer-approved component layout and identification | Improves control and resale presentation |
| Sample Approval | Often limited | Recommended before bulk production | Confirms real component fit and packing |
OEM Packaging and Approval
OEM and Private-Label Thread Repair Kits for Wholesale Supply
Industrial distributors and brand owners can request custom assortment sizes, private-label cases, barcode labels, replacement inserts and standardized repeat-order kits. A physical sample helps confirm tool matching, insert counts, case layout and labeling before bulk production; drawings and price sheets alone cannot establish these details.
Private-Label Capability
Retail and Distributor Packaging
- Plastic or metal storage-case review
- Internal tray, divider and component layout
- Private-label logo and product-name placement
- Barcode, item code and market-language requirements
- Instruction sheet and safety-note review
- Insert-count and tool-size verification
- Refill-pack structure for repeat sales
- Outer carton and shipping-mark requirements
Repeat Order Ecosystem
Replacement Tools, Refill Inserts and Repeat-Order Parts
A repair-kit program should not end with the first kit sale. Define the parts that users will consume, wear out or replace so the product range remains serviceable.
Production and Quality Summary
Wire Insert Production Backed by Kit-Level Verification
The wire inserts are automatically formed in-house. Complete repair kits also require component matching, counting, packaging and sample verification before bulk assembly.
Quality Controls
Production and Kit Checks
- Insert size, pitch, length and configuration confirmation
- Caliper, thread-gauge and free-diameter inspection
- STI tap and drill-bit specification matching
- Installation-tool and tang-tool fit review
- Insert quantity and refill-pack counting
- Case layout, label and barcode confirmation
- Complete physical sample-kit approval before bulk production
Complete kit timing depends on component availability, case sourcing, artwork approval and printing. Custom packaging may require more time than standard insert production.
RFQ Checklist
Information Required for a Thread Repair Kit Quote
Send the complete specification and packaging requirements. A photo of another kit is useful as a reference, but it does not replace the component list, dimensions and insert quantities.
For private-label projects, include the expected sample quantity, target production quantity and destination market.
Include the following details
- Thread standard
- Thread size and pitch
- Insert length
- Insert type
- Tanged or tangless
- Insert material grade / UNS number if specified
- Insert quantity per size
- Drill bit requirement
- STI tap requirement
- Installation tool type
- Tang break tool
- Extractor requirement
- Single-size or assorted kit
- Case material and layout
- Label and logo requirement
- Barcode and item code
- Instruction-sheet language
- Refill-pack requirement
- Replacement tool / spare-part requirement
- Sample quantity
- Bulk order quantity
- Required delivery date
- Destination country
- Certificate requirement
- Material certificate or traceability request
Product FAQ
Thread Repair Kit Ordering Questions
Does Taiyi supply wholesale thread repair kits for distributors?
Yes. We review single-size and assorted repair kits, refill insert packs, industrial repair kits and private-label kit programs for bulk and repeat supply. Send your required thread sizes, tool list, packaging specification, expected order quantity and destination market for a quotation.
Can thread repair kits include Inconel X-750 or other special-alloy inserts?
Customers may specify Inconel X-750 (UNS N07750), Nitronic 60, Nimonic 90 or another alloy for the wire insert component. We assess wire material sourcing, forming suitability, matched tools, inspection and any documentation request before confirming a custom kit.
What is normally included in a thread repair kit?
A complete kit may include wire thread inserts, a matched drill bit, STI tap, installation tool, tang break tool, extractor, case, instruction sheet and refill inserts. The exact contents depend on the kit specification.
Can a standard tap be used instead of an STI tap?
No. A wire thread insert requires a correctly sized STI thread. A standard tap does not create the correct receiving thread for the wire insert.
What is the difference between a repair kit and a refill pack?
A repair kit normally includes the tools required to prepare and repair the thread. A refill pack normally contains replacement inserts for a user who already owns the matched drill bit, STI tap and installation tools.
Can Taiyi supply single-size and assorted metric kits?
Yes. Single-size kits and assorted metric kits can be reviewed. The buyer should define the size range, insert quantity per size, insert length, tool allocation and packaging format.
Can the kit use free-running or screw-locking inserts?
Both configurations can be reviewed. The insert type, tanged or tangless design, installation tools and end application must be confirmed before the kit is finalized.
Can private-label cases and packaging be supplied?
Private-label requirements can include the case, internal layout, logo, label, barcode, item code, instruction sheet, outer carton and refill-pack structure. Commercial feasibility depends on the specification and production quantity.
Why is a physical sample kit required?
A physical sample allows the buyer to verify the actual component sizes, tool fit, insert count, case layout, label, barcode and instruction sheet before bulk production.
Should I buy a single-size kit or a multi-size assortment?
Choose a single-size kit when the target repair thread is known and repeated. Choose an assortment when the workshop or distributor needs several common sizes. The assortment should follow real repair demand rather than simply maximizing the number of sizes.
What is different about a tangless thread repair kit?
A tangless kit uses a tang-free wire insert and a compatible tangless installation tool. It does not use the normal tang-break step of a conventional tanged insert system. Existing tangless tool compatibility should be reviewed before substitution.
Can I reorder only the worn tap, mandrel or other kit tool?
Replacement tools can be reviewed against the exact insert, thread specification, tanged/tangless system and existing tool format. Do not order replacement mandrels or front-end parts from thread size alone when compatibility is controlled.
How long does production normally take?
Standard production normally requires approximately 20–30 days after the technical and commercial details are confirmed. Custom cases, printed labels, special components or complex packaging may require additional time.
Are Taiyi kits official HELICOIL repair kits?
No. Taiyi supplies generic wire thread insert repair kits and related tools. HELICOIL is a trademark of its respective owner.
Standard, Refill and OEM Kit Supply
Need Thread Repair Kits for Samples or Private-Label Production?
Send your thread sizes, pitches, insert lengths, insert materials, quantities, matched STI taps and installation tools, case layout, branding, sample quantity and planned bulk quantity. Taiyi will review the repair system, custom alloy needs, sample approval and delivery requirements.
HELICOIL and Heli-Coil are trademarks of their respective owners. Taiyi Thread Inserts is an independent manufacturer and supplier of generic wire thread inserts, thread repair kits, STI taps and installation tools. Product-category references do not indicate affiliation, authorization or endorsement by the trademark owner.