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

Read more Read less


Viewing 61 - 66 of 66 products
Results per page
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. 194-376
kr 137,91
1 Bag of 100
M5 8.64mm 7.6mm 7.52mm 8mm - - Plain 3.3mm 0.5mm
RS Stock No. 703-1281
Mfr. Part No.34366040230
kr 312,04
1 Bag of 100
M4 - 6mm - - Stainless Steel - Plain - -
RS Stock No. 866-0329
Mfr. Part No.US 2505-T07P
kr 53,04
- - - - - - - - - -
RS Stock No. 623-5555
kr 536,54
1 Bag of 50
M4 7mm 6mm 5.9mm 10mm Stainless Steel A4 316 Clear Passivated, Galvanised 3mm 0.5mm
RS Stock No. 866-0326
Mfr. Part No.US 4008-TI5P
kr 61,56
- - - - - - - - - -
RS Stock No. 866-0322
Mfr. Part No.SR 85020-T15P
kr 85,21
- - - - - - - - - -
Related Products
The AVK™ threaded insert offers a convenient method ...
The AVK™ threaded insert offers a convenient method of securing a threaded bush to thin sheet metal products. Available in A-L™ Flanged and A-K™ Flush versions. Kit includes fixing tool, 100 each M4, M5 & M6 inserts, suitable mandrels and ...
Our own brand, RS Pro insert riveter tool ...
Our own brand, RS Pro insert riveter tool enables users to easily and effortlessly fasten and unfasten rivet nuts. This unique tool, which can sometimes be referred to as a set of rivet nut plyers. A riveting tool is most ...
Threaded inserts M4, M5, M6 can be fixed ...
Threaded inserts M4, M5, M6 can be fixed using the AVK™ tool contained in kit Stock no. 194-310Small flanged low-profile-head version ideal for near-flush requirements. Larger flanged version can be used with out-of-round holes.
Expansion inserts are suitable for use with most ...
Expansion inserts are suitable for use with most plastic materials, using either through or blind holes. Knurled outer diameter with expansion slots prevent rotation or loosening due to vibration and ensures consistent self-locking pressure on the fixing screws. Available with ...