ArmaCoil Thread Inserts
Superior protection and strength for all tapped threads
Free Running Inserts or Screw Lock Inserts
ArmaCoil Inserts provide positive means for protecting and strengthening all tapped threads. They are mirror-smooth, reinforced internal threads of cold rolled 18-8 stainless steel, of hardness 43-50Rc, or other specialised material, with hardness far in excess of the usual tapped materials.
The outstanding engineering features of ArmaCoil inserts, recognised by the leading aerospace, industrial and military equipment manufacturers, have established their widespread use in these fields.
Design flexibility with unlimited opportunities
Maximum design flexibility as well as compliance with conventional engineering practice gives the designer unlimited opportunities to use ArmaCoil Insert assemblies.
Five lengths of insert for each thread size are available; lengths of 1, 1.5, 2, 2.5 and 3 times the nominal thread diameter. This choice of insert length offers the designer the opportunity to balance the tensile strength of the bolt against the shear strength of the parent material.
The variety of insert lengths also aids the designer to conform to the conventional engineering practice of assuring bolt failure rather than damage to the parent material when the assembly is subjected to destructive loads.
A table has been prepared to assist the designer in his choice of thread engagements for different combinations of bolt and parent materials. This information together with all pertinent product data is found in Technical Data and Tooling PDF.
Tensile Strength of ArmaCoil Assemblies
Of major importance to the designer are the charts showing the Tensile Strength of ArmaCoil assemblies.
These charts are available in Metric sizes from M2.2 to M24 and Unified sizes from 2-56 to 1“.
The chart provides all the data necessary to establish the following:
- Tensile Strength of the ArmaCoil assembly
- Minimum length of Thread Engagement
- Shear strengths of various bolt grades
The graphs are easy to use and provide the flexibility of insert size and length selection.
For more information contact our Technical Department.
