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 InsertFor 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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Beskrivning Pris 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-artikelnummer 278-584
VarumärkeRS PRO
369,19 kr
1 Bag of 100
Påse(ar)
M3 - 4mm 4.22mm 4.78mm Brass - - - 6.2mm
RS-artikelnummer 278-534
VarumärkeRS PRO
250,39 kr
1 Bag of 100
Påse(ar)
M3 - 4mm 4.22mm 4.78mm Brass - - - 6.7mm
RS-artikelnummer 768-0729
VarumärkeRS PRO
301,36 kr
1 Bag of 50
Påse(ar)
M4 11.89mm 8.38mm 8.08mm 16.59mm Steel - Bright Zinc Plated 4.75mm 0.38mm
RS-artikelnummer 278-556
VarumärkeRS PRO
318,75 kr
1 Bag of 100
Påse(ar)
M4 - 5.6mm 5.64mm 7.95mm Brass - - - 10.2mm
RS-artikelnummer 278-578
VarumärkeRS PRO
415,79 kr
1 Bag of 100
Påse(ar)
M6 - 8mm 8.26mm 12.7mm Brass - - - 16mm
RS-artikelnummer 768-0732
VarumärkeRS PRO
303,82 kr
1 Bag of 50
Påse(ar)
M5 13.49mm 10.16mm 9.7mm 18.19mm Steel - Bright Zinc Plated 4.75mm 0.38mm
RS-artikelnummer 204-0623
VarumärkeRS PRO
763,86 kr
1 Bag of 100
Påse(ar)
M6 9.5mm 8mm 9.5mm 12.7mm Brass - - 3.3mm -
RS-artikelnummer 204-0617
VarumärkeRS PRO
262,55 kr
1 Bag of 100
Påse(ar)
M4 6.3mm 5.6mm 6.3mm 8.2mm Brass - - 2.1mm -
RS-artikelnummer 278-613
VarumärkeRS PRO
405,02 kr
1 Bag of 100
Påse(ar)
M5 8mm 6.4mm 6.65mm 9.53mm Brass - - - 11.2mm
RS-artikelnummer 768-0723
VarumärkeRS PRO
372,28 kr
1 Bag of 50
Påse(ar)
M4 11.89mm 8.38mm 8.08mm 21.36mm Steel - Bright Zinc Plated 9.53mm 4.75mm
RS-artikelnummer 768-0739
VarumärkeRS PRO
353,94 kr
1 Bag of 50
Påse(ar)
M6 15.88mm 11.43mm 11.13mm 18.57mm Steel - Bright Zinc Plated 4.75mm 0.38mm
RS-artikelnummer 768-0748
VarumärkeRS PRO
405,34 kr
1 Bag of 50
Påse(ar)
M6 15.88mm 11.43mm 11.13mm 23.34mm Steel 9.53 mm Bright Zinc Plated 9.53mm 4.75mm
RS-artikelnummer 278-590
VarumärkeRS PRO
353,62 kr
1 Bag of 100
Påse(ar)
M3.5 - 4.8mm 5.06mm 6.35mm Brass - - - 7.8mm
RS-artikelnummer 204-0620
VarumärkeRS PRO
328,02 kr
1 Bag of 100
Påse(ar)
M3 5.5mm 4mm 5.5mm 5.7mm Brass - - 1.6mm -
RS-artikelnummer 204-0615
VarumärkeRS PRO
218,83 kr
1 Bag of 100
Påse(ar)
M3.5 5.4mm 4.8mm 5.4mm 7.1mm Brass - - 1.8mm -
RS-artikelnummer 204-0616
VarumärkeRS PRO
175,21 kr
1 Bag of 100
Påse(ar)
M3 4.6mm 4mm 4.6mm 5.7mm Brass - - 1.6mm -
RS-artikelnummer 204-0618
VarumärkeRS PRO
447,67 kr
1 Bag of 100
Påse(ar)
M5 7.1mm 6.4mm 7.1mm 9.5mm Brass - - 2.6mm -
RS-artikelnummer 278-607
VarumärkeRS PRO
357,14 kr
1 Bag of 100
Påse(ar)
M4 - 5.6mm 5.64mm 7.95mm Brass - - - 9.4mm
RS-artikelnummer 425-7531
VarumärkeRS PRO
201,23 kr
1 Lot of 100
Parti(er)
M4 9mm 6mm 9mm 11.3mm Steel - Plain 3mm 0.5mm
RS-artikelnummer 204-0619
VarumärkeRS PRO
698,39 kr
1 Bag of 100
Påse(ar)
M6 8.7mm 8mm 8.7mm 12.7mm Brass - - 3.3mm -