Inch size Metric Size Screw Locking Wire Thread Inserts
Inch size Metric Size Screw Locking Wire Thread Inserts
Screw Locking Wire Thread Inserts have all the characteristics of free running inserts but in addition, one or more coils in the middle of the screw lock insert are polygon shaped. These coils serve as a locking device by gripping the threads of the installed screw, effectively preventing the screw from loosening under vibration or impact.
Screw Locking Insert permit frequent removal and reassembly of bolts without appreciable loss of torque. They positively secure the screw against loosening caused by vibration and shock and they will not relax their grip on the screw even in tough metals such as cast iron, alloy steel, titanium etc.
Screw Locking Insert permit frequent removal and reassembly of bolts without appreciable loss of torque. They positively secure the screw against loosening caused by vibration and shock and they will not relax their grip on the screw even in tough metals such as cast iron, alloy steel, titanium etc.

One of the biggest misconceptions regarding locking type helical coil screw thread inserts is the insert has a feature that locks it into place in the parent material. This is not the case. Locking inserts apply a locking, or prevailing, torque on the male fastener.
Screw Locking Wire Thread InsertsParameters
Product name |
Screw Locking Wire Thread Inserts |
Material |
SUS304/SUS316/SUS321/InX750/Brass/Customized |
Surface color |
None / Eco-friendly plating |
Surface coating |
Silver/tin/cadmium/zinc/other |
Thread type |
Metric,Inc UNC, UNF |
Metric Size |
M1.4*0.3P~M85*6.0P |
Inch UNC Size |
1-64~11/2“-6 |
Inch UNF Size |
4-48~11/2“-12 |
Production standard |
MS21209/DIN8140/N926/ITN32760/MO-44421 |
Surface treatment

For steel wire threaded inserts made of 304 stainless steel, the surface treatments available are:
1. No treatment, natural surface
2. Environmentally friendly colour plating, according to customer needs can be plated in purple, green, blue, red. In industries where large quantities of threaded inserts are required, colour plated wire threaded inserts help to identify whether they are installed or not. The different colours of the wire threaded inserts are also very convenient for visual management.
3. Cadmium plating, cadmium (cd) plated steel wire threaded inserts corrosion resistance, lubrication, wear resistance, electrical conductivity, electromagnetic properties, heat resistance is stronger.
4. Silver-plated, silver-plated steel threaded bushings can be installed in a variety of shell materials, including magnesium alloys, aluminium alloys and corrosion and heat-resistant materials, mainly used to reduce the screw threads in the high-temperature state of the bonding effect.
5. Tin-plated, tin-plated steel wire threads inserts have the biggest advantage of better corrosion resistance, for corrosion resistance has high requirements, you can consider tin-plated coating of steel wire threads.
6.Dry film lubrication for mild corrosion or high temperature environment.
1. No treatment, natural surface
2. Environmentally friendly colour plating, according to customer needs can be plated in purple, green, blue, red. In industries where large quantities of threaded inserts are required, colour plated wire threaded inserts help to identify whether they are installed or not. The different colours of the wire threaded inserts are also very convenient for visual management.
3. Cadmium plating, cadmium (cd) plated steel wire threaded inserts corrosion resistance, lubrication, wear resistance, electrical conductivity, electromagnetic properties, heat resistance is stronger.
4. Silver-plated, silver-plated steel threaded bushings can be installed in a variety of shell materials, including magnesium alloys, aluminium alloys and corrosion and heat-resistant materials, mainly used to reduce the screw threads in the high-temperature state of the bonding effect.
5. Tin-plated, tin-plated steel wire threads inserts have the biggest advantage of better corrosion resistance, for corrosion resistance has high requirements, you can consider tin-plated coating of steel wire threads.
6.Dry film lubrication for mild corrosion or high temperature environment.
Application of wire threaded inserts
1.Assembly Improve the performance of internal thread connection:
Embed the steel wire thread insert on metal or non-metallic materials to form a high strength, wear-resistant, interchangeable standard internal thread. Applied to aluminium, magnesium, copper alloy, plastic, organic glass, plywood and other low-strength engineering materials, it can significantly improve the strength and wear resistance; applied to steel, cast steel, cast iron, it can improve the durability of the screw , prevent the screw from loosening due to a variety of vibrations caused by the screw to fall, fatigue rupture and to improve the fatigue strength of the screw in the connection.s
Embed the steel wire thread insert on metal or non-metallic materials to form a high strength, wear-resistant, interchangeable standard internal thread. Applied to aluminium, magnesium, copper alloy, plastic, organic glass, plywood and other low-strength engineering materials, it can significantly improve the strength and wear resistance; applied to steel, cast steel, cast iron, it can improve the durability of the screw , prevent the screw from loosening due to a variety of vibrations caused by the screw to fall, fatigue rupture and to improve the fatigue strength of the screw in the connection.s

2.Conversion metric and imperial thread conversion:
the use of steel wire thread insert for metric ← → inch system ← → international standard threaded hole conversion, very convenient, fast, economical, practical, applicable to any import and export products.
3.Repair internal thread repair:
In the event of thread processing errors or repair of damaged internal threaded holes, the use of steel wire threaded bushings as a means of repair can be obtained without increasing the weight and volume of the repair economically to save the important parts, fast and effective repair to the original state, while also meeting or exceeding the original technical requirements.
the use of steel wire thread insert for metric ← → inch system ← → international standard threaded hole conversion, very convenient, fast, economical, practical, applicable to any import and export products.
3.Repair internal thread repair:
In the event of thread processing errors or repair of damaged internal threaded holes, the use of steel wire threaded bushings as a means of repair can be obtained without increasing the weight and volume of the repair economically to save the important parts, fast and effective repair to the original state, while also meeting or exceeding the original technical requirements.