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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Description Price 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 Stock No. 278-534
BrandRS PRO
SGD23.16
1 Bag of 100
Bag(s)
M3 - 4mm 4.22mm 4.78mm Brass - - - 6.7mm
RS Stock No. 278-556
BrandRS PRO
SGD23.86
1 Bag of 100
Bag(s)
M4 - 5.6mm 5.64mm 7.95mm Brass - - - 10.2mm
RS Stock No. 667-9851
Mfr. Part No.AVKAKS3T-8125-7.9
BrandAVK
SGD46.40
1 Bag of 50
Bag(s)
M8 15.11mm 13.5mm 13.46mm 10.8mm - - Plain 7.9mm 3.8mm
RS Stock No. 278-562
BrandRS PRO
SGD31.14
1 Bag of 100
Bag(s)
M5 - 6.4mm 6.65mm 9.35mm Brass - - - 12.2mm
RS Stock No. 278-607
BrandRS PRO
SGD39.17
1 Bag of 100
Bag(s)
M4 - 5.6mm 5.64mm 7.95mm Brass - - - 9.4mm
RS Stock No. 278-584
BrandRS PRO
SGD52.10
1 Bag of 100
Bag(s)
M3 - 4mm 4.22mm 4.78mm Brass - - - 6.2mm
RS Stock No. 623-5527
BrandPOP
SGD28.98
1 Bag of 100
Bag(s)
M5 7.8mm 7.2mm 7.2mm 12mm Steel - Galvanised 2mm 0.5mm
RS Stock No. 138-893
Mfr. Part No.34367030020/01
BrandBöllhoff
SGD27.33
1 Bag of 100
Bag(s)
M3 - 5mm - 7.9mm - - Plain - -
RS Stock No. 194-304
BrandAVK
SGD35.31
1 Bag of 50
Bag(s)
M8 17.4mm 13.5mm 13.46mm 11.94mm - - Plain 3.8mm 0.7mm
RS Stock No. 278-578
BrandRS PRO
SGD45.82
1 Bag of 100
Bag(s)
M6 - 8mm 8.26mm 12.7mm Brass - - - 16mm
RS Stock No. 425-7575
Mfr. Part No.23307100235
BrandBöllhoff
SGD87.08
1 Lot of 100
Lot(s)
M10 19mm 13mm - 22mm Steel - Plain 3.5mm 0.7mm
RS Stock No. 212-666
Mfr. Part No.23306030015
BrandBöllhoff
SGD145.08
1 Bag of 100
Bag(s)
M3 7mm 5mm - 9.3mm Stainless Steel - Plain 1.5mm 0.7mm
RS Stock No. 664-7361
Mfr. Part No.56000000082/01
BrandBöllhoff
SGD51.64
1 Lot of 50
Lot(s)
M10 - - 14mm - Steel - Galvanised - -
RS Stock No. 623-5634
BrandPOP
SGD59.66
1 Bag of 100
Bag(s)
M6 10.16mm - - 13.08mm Steel - Clear Passivated, Galvanised - -
RS Stock No. 768-0739
BrandRS PRO
SGD41.42
1 Bag of 50
Bag(s)
M6 15.88mm 11.43mm 11.13mm 18.57mm Steel - Bright Zinc Plated 4.75mm 0.38mm
RS Stock No. 623-5533
BrandPOP
SGD48.33
1 Bag of 100
Bag(s)
M8 11.5mm 10.6mm 10.5mm 16mm Steel - Galvanised 3mm 1mm
RS Stock No. 623-5498
BrandPOP
SGD27.07
1 Bag of 100
Bag(s)
M3 5.3mm 4.8mm 4.7mm 9mm Steel - Galvanised 1.5mm 0.5mm
RS Stock No. 278-629
BrandRS PRO
SGD54.24
1 Bag of 100
Bag(s)
M6 - 8mm 8.26mm 12.7mm Brass - - - 14.8mm
RS Stock No. 768-0748
BrandRS PRO
SGD43.57
1 Bag of 50
Bag(s)
M6 15.88mm 11.43mm 11.13mm 23.34mm Steel - Bright Zinc Plated 9.53mm 4.75mm
RS Stock No. 664-7368
Mfr. Part No.56000000081/01
BrandBöllhoff
SGD64.28
1 Lot of 100
Lot(s)
M8 - - - 15mm Steel - Galvanised - -