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. 623-5511
BrandPOP
HK$167.18
1 Bag of 100
Bag(s)
M6 10.5mm 9.6mm 9.5mm 14.8mm Steel - Galvanised 2.5mm 0.8mm
RS Stock No. 667-9835
Mfr. Part No.AVKALS3T-470-3.3
BrandAVK
HK$138.32
1 Bag of 100
Bag(s)
M4 9.91mm 6.75mm 6.73mm 7.75mm - - Plain 3.3mm 2mm
RS Stock No. 623-5505
BrandPOP
HK$119.78
1 Bag of 100
Bag(s)
M4 7mm 6.4mm 6.3mm 10.4mm Steel - Galvanised 1.5mm 0.5mm
RS Stock No. 623-5498
BrandPOP
HK$94.53
1 Bag of 100
Bag(s)
M3 5.3mm 4.8mm 4.7mm 9mm Steel - Galvanised 1.5mm 0.5mm
RS Stock No. 194-304
BrandAVK
HK$229.05
1 Bag of 50
Bag(s)
M8 17.4mm 13.5mm 13.46mm 11.94mm - - Plain 3.8mm 0.7mm
RS Stock No. 194-326
BrandAVK
HK$274.44
1 Bag of 100
Bag(s)
M6 12.7mm 10mm 9.91mm 9.65mm - - Plain 4.2mm 0.7mm
RS Stock No. 623-5527
BrandPOP
HK$130.77
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
HK$112.39
1 Bag of 100
Bag(s)
M3 - 5mm - 7.9mm - - Plain - -
RS Stock No. 425-7581
Mfr. Part No.34367040230
BrandBöllhoff
HK$147.20
1 Lot of 100
Lot(s)
M4 6.7mm 6mm 9mm 11mm Steel - Plain 3mm 0.5mm
RS Stock No. 768-0748
BrandRS PRO
HK$213.77
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. 703-1281
Mfr. Part No.34366040230
BrandBöllhoff
HK$306.33
1 Bag of 100
Bag(s)
M4 - 6mm - - Stainless Steel - Plain - -
RS Stock No. 768-0732
BrandRS PRO
HK$173.26
1 Bag of 50
Bag(s)
M5 13.49mm 10.16mm 9.7mm 18.19mm Steel - Bright Zinc Plated 4.75mm 0.38mm
RS Stock No. 278-607
BrandRS PRO
HK$144.19
1 Bag of 100
Bag(s)
M4 - 5.6mm 5.64mm 7.95mm Brass - - - 9.4mm
RS Stock No. 278-584
BrandRS PRO
HK$118.82
1 Bag of 100
Bag(s)
M3 - 4mm 4.22mm 4.78mm Brass - - - 6.2mm
RS Stock No. 278-556
BrandRS PRO
HK$104.06
1 Bag of 100
Bag(s)
M4 - 5.6mm 5.64mm 7.95mm Brass - - - 10.2mm
RS Stock No. 623-5555
BrandPOP
HK$242.01
1 Bag of 50
Bag(s)
M4 7mm 6mm 5.9mm 10mm Stainless Steel A4 316 Clear Passivated, Galvanised 3mm 0.5mm
RS Stock No. 425-7604
Mfr. Part No.34367060230
BrandBöllhoff
HK$220.86
1 Lot of 100
Lot(s)
M6 10mm 9mm 13mm 14mm Steel - Plain 3mm 0.5mm
RS Stock No. 664-7359
Mfr. Part No.56000000080/01
BrandBöllhoff
HK$296.39
1 Lot of 100
Lot(s)
M6 - - - 14mm Steel - Galvanised - -
RS Stock No. 425-7597
Mfr. Part No.34367050230
BrandBöllhoff
HK$185.61
1 Lot of 100
Lot(s)
M5 8mm 7mm 10mm 13mm Steel - Plain 3mm 0.5mm
RS Stock No. 212-676
Mfr. Part No.23306050233/01
BrandBöllhoff
HK$473.00
1 Bag of 100
Bag(s)
M5 9mm 7mm - 11.8mm Stainless Steel - Plain 1.5mm 0.7mm