Helical insert W.TEC® INSERT COIL Free Running
Wire thread insert FR A2 W.TEC series
HELCINRT-FR-A2-M20X25
W.TEC
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Perfect combination of space-spacing and wear-resistant thread strength
- In low-strength metal materials
- In plastics
Optimal force distribution
Flexibility of the thread inserts compensates for pitch and angle errors
Thread insert sits securely
Minimised thread friction torque and minimised torsional stress
Increased corrosion resistance
Space and weight minimisation
Smaller number of required connection points and/or reduced screwing dimensions
Costs minimised
By reinforcing the thread, which effectively minimises the repair costs
The tolerance position of the ISO thread corresponds to 6H following installation.
The tolerance position of the ISO thread corresponds to 6H following installation.
Datasheets(X)
CAD data (available after login)
A resistant thread in 4 steps:
Step 1:
Drill a core hole or drill out the damaged thread
Step 2:
Create a receiving thread
- By cutting using screw tap
OR
- Without cutting using thread moulding for an even more resilient receiving thread
Step 3:
Set the thread insert
- The helical insert can be mounted both mechanically and also by hand using the corresponding screw-in tool.
Step 4:
Break the pin
- Separate the follower pin by tapping gently on the predetermined break point with a pin breaker, and then remove. Automatic pin breakers are also available for series production.
 | |
Material | Stainless steel A2 |
Surface | Plain |
Design | Free running |
Thread type x nominal diameter | M20 |
Length built-in state (l1) | 25 mm |
Outer diameter (d1) | 23.2 mm |
Thread form | Standard metric thread |
Pitch | 2.5 mm |
Core hole diameter | 20.5 mm |
Min. core hole depth | 36.25 mm |
Required thread depth at stud hole | 33.75 mm |
| Determining the nominal length (reference values) | ||||
| Material strength of workpiece Rm in N/mm² | Nominal lengths for thread inserts depending on the strength class of the screw or the yield strength of the screw material in N/mm² | |||
| 5.8/400 | 8.8/640 | 10.9/900 | 12.9/1080 | |
| up to 150 | 2 d | 2.5 d | 2.5 d | 2.5 d |
| Over 150 up to 200 | 1.5 d | 2 d | 2 d | 2.5 d |
| Over 200 up to 250 | 1.5 d | 1.5 d | 2 d | 2.5 d |
| Over 250 up to 300 | 1 d | 1.5 d | 1.5 d | 2 d |
| Over 300 up to 400 | 1 d | 1 d | 1.5 d | 1.5 d |
| Over 400 | 1 d | 1 d | 1.5 d | 1.5 d |
| Thread inserts with a nominal length that corresponds to the material strength of the workpiece and the strength class of the screw (in accordance with the table) achieve the minimum breaking force of the screw as per ISO 898-1 | ||||
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