Welcome to Thread Master

HELICOIL® thread inserts have been proven in practice. For over 65 years. They are available in Free Running and Screwlock versions. The green or red colour simplifies identification when installed.

The HELICOIL® is used in mechanical engineering, electronics, automotive and aerospace industries. HELICOIL® is also applied in gear housings, exhaust systems, engines and satellites, thread reinforcement, repeated installations, maintenance and repair as well as in lights, electrical appliances, hammer drills and printing presses.

HELICOIL® Plus thread inserts comply with a variety of requirements and industry standards, including those in the aerospace industry, and feature other approvals as well as suitability tests, e.g. in the field of power plant technology.

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FEATURED PRODUCTS

Twin Sert Metric Helicoils

TwinSert Metric Helicoils

Twin Sert Metric Helicoils

Price range: R59,00 through R210,00
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M2.5x0.45 Helicoil FR

Metric Helicoils

M2.5×0.45 Helicoil FR

Price range: R4,99 through R5,60
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Wood Serts

Wood Inserts

Wood Serts

Price range: R9,00 through R25,00
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Thin Wall S/S 303 Inserts

Thin Wall Inserts

Thin Wall S/S 303 Inserts

Price range: R38,00 through R79,00
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Spark Plug Time-Sert Inserts

Time Serts

Spark Plug Time-Sert Inserts

Price range: R59,00 through R100,00
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UNF Imperial Time-Sert Inserts

Time Serts

UNF Imperial Time-Sert Inserts

Price range: R44,00 through R105,00
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UNC Imperial Time-Sert Inserts

Time Serts

UNC Imperial Time-Sert Inserts

Price range: R40,00 through R125,00
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Metric Time-Sert Inserts

Time Serts

Metric Time-Sert Inserts

Price range: R40,00 through R125,00
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BaerCoil Thread Repair Workshop Kit

Helicoil Kits

BaerCoil Thread Repair Workshop Kit

R4 999,00
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Helicoil Manual Straight Taps

Metric Helicoil Taps

Helicoil Manual Straight Taps

Price range: R580,00 through R5 990,00
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Engineered for Stronger, Longer-Lasting Threads

HELICOIL® thread inserts strengthen threaded connections, prevent thread wear, and improve reliability in metal and lightweight materials. With proven performance across automotive, aerospace, engineering, and industrial applications, they deliver a durable repair and reinforcement solution built to last.

 

Features & Benefits of Helicoils

Heli-Coil inserts provide a positive means for protecting and strengthening
tapped threads in any material. The unique design features of the insert offer many benefits.

Stronger Assemblies

The flexible design of HELICOIL® inserts distributes dynamic and static loads evenly across the threaded connection, improving strength and compensating for lead and angle variations.

No Thread Wear

Increase thread life through repeated assembly and disassembly. The hardened stainless steel insert reduces friction and minimises wear on the parent material.

Corrosion Resistance

Superior corrosion resistance helps minimise galvanic action, ensuring long-term reliability in demanding environments.

Design Flexibility

Balance bolt tensile strength with parent material shear strength while choosing from multiple insert lengths to suit your application.

Eliminate Stress

The spring-like action secures the insert without staking, locking or swaging, preventing unnecessary stress on the parent material.

Minimise Space & Weight

Use smaller bosses and flanges while maintaining thread strength, making HELICOIL® ideal for lightweight and compact designs.

Minimise Total Cost

Reduce installation costs, material costs and long-term maintenance while maintaining maximum thread strength and reliability.

True Clamping Torque

The smooth thread surface delivers maximum bolt tension with lower installation torque for consistent clamping performance.

Wide Temperature Range

HELICOIL® stainless steel inserts perform reliably in temperatures from approximately -196°C to +427°C.

Quality & Reliability

Manufactured to stringent engineering and quality standards, HELICOIL® inserts deliver dependable performance across automotive, industrial and aerospace applications.

Screw Locking INserts

Heli-Coil offers three types of Locking Inserts for multiple applications.

Screw-Locking Inserts

  • A resilient locking mechanism that grips the bolt and prevents it from loosening under vibration or impact.
  • Repeated assembly and disassembly without appreciable loss of positive self-locking torque.
  • Savings in space, weight and money, through the elimination of lock wiring, lock nuts, lock washers, chemical compounds, plastic pellets/patches and/or other locking mechanisms.
  • Inch inserts dyed red for easy identification.
  • Meets NASM8846, MA1565, NASM21209, MA3329, MA3330, MA3331.

Hi-Torque Inserts

  • Similar to Screw-Locking but with higher prevailing torque which compensates for reduced friction in highly lubricated applications.
  • Ideal for higher vibration applications.
  • Approximate 40% increase in prevailing torque levels.
  • Available in #10 through 3/8″ UNF only.
  •  Meets AS1394, AS3094, AS3095, AS3096, AS3097

Stud-Lock Inserts

  • Highest prevailing torque insert available.
  • Enables use of threaded rod for space-saving stud applications.
  • Allows for any class fit of threaded rod.
  • Eliminates inconsistencies caused by interference-fit studs.
  • Available for both straight and step studs, #10 through 1/2″ UNC and UNF.
  • Meets AS1229, AS3080, AS3081, AS3082, AS3083.