Threaded Inserts

A threaded insert is a cylindrical tube-shaped piece of metal with an internal thread. Threaded inserts are designed to be placed into existing holes to provide a threaded receptacle so that screws, bolts or other fixings can be installed. Threaded inserts with an external thread are also used to strengthen existing threads or to repair damaged threads usually in metalwork.
How to fit a threaded insert
The first step is to drill, mill tap or cut a hole of the recommended size into the material the insert will be embedded. The second step depends entirely on the type of insert, the material it will be used with and how the insert will be fitted.
Types of Threaded Insert
For plastic
Plastics are generally categorized into two main types Thermoplastic and Thermoset. These two plastics may sound similar but their physical characteristics are very different. Therefore the type of insert used is different.
• Thermoset
Thermoset plastics, due to cross-linking polymers at the curing stage enhance the materials physical and mechanical properties. This process makes thermoset plastic easier to mill and drill, so a press-fit threaded insert is better for this application.
• Thermoplastic
Threaded inserts for thermoplastic materials are more specialized and require a slightly different approach. Inserts are installed by heating the metal insert to a specific temperature. Once the desired temperature is reached the threaded insert is pressed onto the plastic. The heat from the metal melts the plastic and the insert fits into the desired position. When the plastic cools the insert is retained.
Threaded inserts for metal
Threaded inserts for metal have an external thread. The insert is simply matched by thread size and screwed into the existing threaded hole.
Threaded inserts for wood
It is possible to use both press-in and thread-in inserts in wood. If however a hardwood is being used it is advised to prepare a slightly larger hole than the insert and secure with a suitable adhesive. Hardwoods have a higher chance of cracking than other woods.
Materials and finishes
Threaded inserts are available in various materials and finishes and metric course threads to suit every application.
• Brass
• Steel
• Stainless Steel (316 & 302)
• Bright zinc plated
• Clear passivated
• Galvanised
• Plain
Thread sizes
M3, M3.5, M4, M5, M6, M8 and M10
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Detalii produs Marca Thread Size Flange Diameter Fixing Hole Diameter Body Outside Diameter Body Depth Material Stainless Steel Type Finish Thickness of Material Maximum Thickness of Material Minimum
RS, M3 Brass Threaded Insert diameter 4mm Depth 4.78mm RS Pro M3 - 4mm 4.22mm 4.78mm Brass - - - 6.7mm
RS Pro, M4 Brass Threaded Insert diameter 5.6mm Depth 7.95mm RS Pro M4 - 5.6mm 5.64mm 7.95mm Brass - - - 10.2mm
RS Pro, M3 Brass Threaded Insert diameter 4mm Depth 4.78mm RS Pro M3 - 4mm 4.22mm 4.78mm Brass - - - 6.2mm
RS, M5 Brass Threaded Insert diameter 6.4mm Depth 9.35mm RS Pro M5 - 6.4mm 6.65mm 9.35mm Brass - - - 12.2mm
POP Galvanised, M5 Steel Threaded Insert, 7.8mm diameter 7.2mm Depth 12mm POP M5 7.8mm 7.2mm 7.2mm 12mm Steel - Galvanised 2mm 0.5mm
RS Pro Bright Zinc Plated, M5 Steel Threaded Insert, 13.49mm diameter 10.16mm Depth 18.19mm RS Pro M5 13.49mm 10.16mm 9.7mm 18.19mm Steel - Bright Zinc Plated 4.75mm 0.38mm
AVK Plain, M6 Threaded Insert, 12.7mm diameter 10mm Depth 9.65mm AVK M6 12.7mm 10mm 9.91mm 9.65mm - - Plain 4.2mm 0.7mm
POP Galvanised, M4 Steel Threaded Insert, 7mm diameter 6.4mm Depth 10.4mm POP M4 7mm 6.4mm 6.3mm 10.4mm Steel - Galvanised 1.5mm 0.5mm
AVK Plain, M6 Threaded Insert, 11.56mm diameter 10mm Depth 9.65mm AVK M6 11.56mm 10mm 9.91mm 9.65mm - - Plain 4.2mm 0.7mm
POP Clear Passivated, Galvanised, M5 Steel Threaded Insert, 7.77mm diameter 7mm Depth 9.4mm POP M5 7.77mm 7mm 6.9mm 9.4mm Steel - Clear Passivated, Galvanised - -
AVK Plain, M5 Threaded Insert, 10.54mm diameter 7.6mm Depth 8mm AVK M5 10.54mm 7.6mm 7.52mm 8mm - - Plain 3.3mm 0.5mm
POP Galvanised, M6 Steel Threaded Insert, 10.5mm diameter 9.6mm Depth 14.8mm POP M6 10.5mm 9.6mm 9.5mm 14.8mm Steel - Galvanised 2.5mm 0.8mm
RS Pro, M5 Brass Threaded Insert, 8mm diameter 6.4mm Depth 9.53mm RS Pro M5 8mm 6.4mm 6.65mm 9.53mm Brass - - - 11.2mm
RS Bright Zinc Plated, M4 Steel Threaded Insert, 11.89mm diameter 8.38mm Depth 16.59mm RS Pro M4 11.89mm 8.38mm 8.08mm 16.59mm Steel - Bright Zinc Plated 4.75mm 0.38mm
AVK Plain, M5 Threaded Insert, 8.64mm diameter 7.6mm Depth 8mm AVK M5 8.64mm 7.6mm 7.52mm 8mm - - Plain 3.3mm 0.5mm
POP Galvanised, M3 Steel Threaded Insert, 5.3mm diameter 4.8mm Depth 9mm POP M3 5.3mm 4.8mm 4.7mm 9mm Steel - Galvanised 1.5mm 0.5mm
RS Pro, M4 Brass Threaded Insert diameter 5.6mm Depth 7.95mm RS Pro M4 - 5.6mm 5.64mm 7.95mm Brass - - - 9.4mm
AVK Plain, M4 Threaded Insert, 9.91mm diameter 6.75mm Depth 7.75mm
  • Nr. Stoc RS 667-9835
  • Marca AVK
  • Cod Producator AVKALS3T-470-3.3
AVK M4 9.91mm 6.75mm 6.73mm 7.75mm - - Plain 3.3mm 2mm
POP Plain, M5 Stainless Steel Threaded Insert, 7.8mm diameter 7mm Depth 11.8mm POP M5 7.8mm 7mm 6.9mm 11.8mm Stainless Steel 302 Plain 3mm 0.5mm
Böllhoff Plain, M6 Steel Threaded Insert, 13mm diameter 9mm Depth 14.5mm Böllhoff M6 13mm 9mm 13mm 14.5mm Steel - Plain 3mm 0.5mm
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