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. 623-5498
BrandPOP
PHP869.57
1 Bag of 100
Bag(s)
M3 5.3mm 4.8mm 4.7mm 9mm Steel - Galvanised 1.5mm 0.5mm
RS Stock No. 425-7597
Mfr. Part No.34367050230
BrandBöllhoff
PHP972.97
1 Lot of 100
Lot(s)
M5 8mm 7mm 10mm 13mm Steel - Plain 3mm 0.5mm
RS Stock No. 664-7368
Mfr. Part No.56000000081/01
BrandBöllhoff
PHP2,450.16
1 Lot of 100
Lot(s)
M8 - - - 15mm Steel - Galvanised - -
RS Stock No. 194-304
BrandAVK
PHP1,174.93
1 Bag of 50
Bag(s)
M8 17.4mm 13.5mm 13.46mm 11.94mm - - Plain 3.8mm 0.7mm
RS Stock No. 623-5599
BrandPOP
PHP1,007.08
1 Bag of 100
Bag(s)
M3 5.36mm - - 9.4mm Steel - Clear Passivated, Galvanised - -
RS Stock No. 623-5577
BrandPOP
PHP1,551.87
1 Bag of 50
Bag(s)
M6 9.8mm 9mm 8.9mm 14.3mm Stainless Steel 302 Plain 3mm 0.5mm
RS Stock No. 664-7352
Mfr. Part No.56000000078/01
BrandBöllhoff
PHP1,630.34
1 Lot of 100
Lot(s)
M4 - - - 8mm Steel - Galvanised - -
RS Stock No. 425-7575
Mfr. Part No.23307100235
BrandBöllhoff
PHP1,842.46
1 Lot of 100
Lot(s)
M10 19mm 13mm - 22mm Steel - Plain 3.5mm 0.7mm
RS Stock No. 623-5555
BrandPOP
PHP1,555.11
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. 623-5612
BrandPOP
PHP1,123.47
1 Bag of 100
Bag(s)
M5 7.77mm 7mm 6.9mm 9.4mm Steel - Clear Passivated, Galvanised - -
RS Stock No. 194-427
BrandAVK
PHP1,279.68
1 Bag of 100
Bag(s)
M5 10.54mm 7.6mm 7.52mm 8mm - - Plain 3.3mm 0.5mm
RS Stock No. 425-7610
Mfr. Part No.34367080230
BrandBöllhoff
PHP1,631.15
1 Lot of 100
Lot(s)
M8 12mm 11mm 16mm 17.5mm Steel - Plain 3mm 0.5mm
RS Stock No. 623-5505
BrandPOP
PHP668.14
1 Bag of 100
Bag(s)
M4 7mm 6.4mm 6.3mm 10.4mm Steel - Galvanised 1.5mm 0.5mm
RS Stock No. 425-7581
Mfr. Part No.34367040230
BrandBöllhoff
PHP884.53
1 Lot of 100
Lot(s)
M4 6.7mm 6mm 9mm 11mm Steel - Plain 3mm 0.5mm
RS Stock No. 623-5533
BrandPOP
PHP883.72
1 Bag of 100
Bag(s)
M8 11.5mm 10.6mm 10.5mm 16mm Steel - Galvanised 3mm 1mm
RS Stock No. 623-5511
BrandPOP
PHP1,483.52
1 Bag of 100
Bag(s)
M6 10.5mm 9.6mm 9.5mm 14.8mm Steel - Galvanised 2.5mm 0.8mm
RS Stock No. 425-7547
Mfr. Part No.23307050230
BrandBöllhoff
PHP952.08
1 Lot of 100
Lot(s)
M5 10mm 7mm 10mm 13mm Steel - Plain 3mm 0.5mm
RS Stock No. 425-7553
Mfr. Part No.23307060230
BrandBöllhoff
PHP1,264.56
1 Lot of 100
Lot(s)
M6 13mm 9mm 13mm 14.5mm Steel - Plain 3mm 0.5mm
RS Stock No. 667-9845
Mfr. Part No.AVKAKS3T-470-3.3
BrandAVK
PHP943.75
1 Bag of 100
Bag(s)
M4 7.87mm 6.75mm 6.73mm 7.75mm - - Plain 3.3mm 2mm
RS Stock No. 664-7355
Mfr. Part No.56000000079/01
BrandBöllhoff
PHP2,047.73
1 Lot of 100
Lot(s)
M5 - - - 10mm Steel - Galvanised - -
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