Helical inserts and self-tapping thread inserts

for thread reinforcement

Thread inserts can be used to create high-strength and resistant internal threads in materials with low shear strength (light metal alloys, aluminium, brass, plastic, etc.).

At a time when sustainable use of resources and reduction of energy consumption are playing an increasingly important role, the need for lightweight materials is becoming ever more apparent. In order to ensure high-strength and vibration-resistant screw connections, high-performance nut threads are essential - reinforced by threaded inserts.

Thread inserts for thread repair

When repairing threads, damaged or worn threads can also be permanently repaired with the help of thread inserts, thereby resulting in economic benefits. Thread inserts can be used to reliably repair stripped, worn-out, seized or damaged threads.

Thread inserts

Helical inserts

With helical inserts, you create a threaded connection that cannot be surpassed by any other single screw connection when it comes to wear resistance, thread friction, surface quality, corrosion and heat resistance.

The helical inserts consist of a diamond-shaped wire that is moulded into a resilient spindle. The diamond shape results in a high degree of strain hardening in the material, which achieves a material tensile strength of at least 1400 N/mm².

Free Running

It is the ultimate when it comes to thread reinforcement. It is easily possible to repair the stripped or damaged threads with helical inserts, even with material strength of up to 800 N/mm2. The thread insert can also be used with thin residual wall thicknesses due to its low space requirement.

Screw Grip

It combines the advantages of the Free Running variant with the benefits of a clamping threadlocker. The clamping torques are comparable with the specifications of DIN EN ISO 2320.

Self-tapping thread inserts

Self-tapping thread inserts are the time-saving option for thread repair and thread reinforcement. They cut their own holding thread when screwed into a mounting hole. This guarantees absolutely secure and firm anchorage in the mounting material.

The tight tolerances between the thread insert and the nut thread create a permanent anchorage that is resistant to shock and vibration in the work piece.

With cutting hole

Compared to inserts with a cutting slot, inserts with a cutting hole have thicker walls and can therefore also be used in higher-strength materials (light metals and steels: up to 450 N/mm2, cast iron 240 HB). The short versions of the thread inserts also offer advantages for thin material thicknesses.

With cutting slot

With this time-saving variant, no thread needs to be pre-cut. These thread inserts are designed for applications up to approx. 400 N/mm2 for light metals and steels, up to 240 HB for cast iron and for fibre-reinforced plastics.

Areas of application and industries

Household appliances
Household appliances
Household appliances
Plant and equipment engineering
Plant and equipment engineering
Plant and equipment engineering
Automotive industry and transport
Automotive industry and transport
Automotive industry and transport
Laboratory and electrical engineering
Laboratory and electrical engineering
Laboratory and electrical engineering
Everything at a glance
Thread repair

Being one with the work piece: Threaded bushing TIME-SERT®

Overcome the challenges beyond series production

Threads stripping due to overstressing is quite a common problem in maintenance. Quick solutions are required to repair the thread and avoid long downtimes.

Wherever the threads are subject to toughest conditions and short maintenance intervals, TIME-SERT® thread repair system is suitable for repairing thin-sided materials or for threads having few thread turns.

A massive bushing made of solid material is inserted in the damaged thread and pressed with a work piece. This creates a gas-proof connection between the bushing and the work piece. Ideal for use in mechanical engineering or automobile industry!

With us, you will always find the right product.

Every single industry requires products that are geared to very specific purposes. To support the requirements of a market holistically, we consistently analyse the current needs and future requirements of our customers.

This resulted in our W.TEC® product series with products for requirements-based solutions and industry-specific innovations. We guarantee optimal and consistent quality and first-class technical service. We can give you expert advice and best practices so that you will always find the right product, be it plastic cabs, slings, screws for thermoplastic materials or many more.

Our procurement and supply expertise.

FAQs on thread inserts

  • Aluminium and aluminium alloys
  • Brass, bronze, cast iron
  • Magnesium alloys
  • Thermosets and thermoplastics
  • Steel (helical inserts only)

  • High load-bearing capacity of the thread
  • Wear resistance
  • Low and constant thread friction
  • Even pressure distribution, highly resilient
  • Corrosion and temperature resistant
  • Saves weight, space and material

Thread inserts can be fitted in existing work pieces easily:

Step 1: Drill core hole

Create the drill hole with a suitable twist drill bit. Optionally, the drill hole can be countersunk with a tapered countersink.

Step 2: Create holding thread

Use the special screw tap to cut the holding thread into the hole. Screw taps are suitable for blind holes and through holes. It is recommended to use the cutting oil.

Alternatively, thread formers can be used to produce even more resilient holding threads by chipless forming of the mating material.

Step 3: Set the thread insert

Place the thread insert on the tool. Fix the adjusting ring so that the tang of the thread insert is in the centre of the groove. Screw the thread insert into the holding thread (by hand or by machine), while applying slight pressure, until it is 1/4 - 1/2 turns below the surface. Do not turn against the direction of rotation, as there is a risk of the tang breaking.

Step 4: Break the locking pin

Turn the installation tool back and by 90° so that it sits on the pin. Briefly tap the back of the tool. If available, remove the pin with a pin breaking tool. For larger dimensions ≥ M14, remove the pin using pointed pliers.

Thread inserts can be fitted in existing work pieces easily:

Step 1: Drill

Drill out the old hole with a core drill. Countersink the hole with a tapered countersink, if necessary.

Step 2: Turn the thread insert onto the inserting tool

Turn the thread insert onto the screw-in tool with the cutting slots or cutting holes facing downwards and lock with the nut. An open-end spanner can be helpful here.

Step 3: Screw in the thread insert

Screw the self-tapping thread insert into the hole. The thread insert cuts its own holding thread.

The installation tool has a ¼" hexagon socket and can therefore be operated with a ratchet tool, nut or cordless screwdriver.

Step 4: Unscrew the inserting tool

Loosen the lock nut again with the open-end spanner and unscrew the inserting tool.

With the thread insert, the thread is now more wear-resistant, highly resilient and vibration-proof than the original thread.