Selection

ArmaCoil Wire Thread Inserts are available in five lengths which are multiples of the Nominal Diameter of the screw; 1, 1.5, 2, 2.5 and 3. Good engineering practice of balancing the tensile strength of the bolt with the shear strength of the parent material can be found in the table.

The following factors must be considered;

1.	Where the parent material shear strength falls between two values - use the lower of the two values.
2.	Parent material shear strengths are for room temperature. Elevated temperatures call for significant reductions - allowances should be made where necessary.
3.	Ensure that the thread engagement in the ArmaCoil is adequate to comply with the design criteria.
4.	Actual bolt tensile strength, especially in the lower bolt tensile range, may be significantly higher than the Nominal Values. This should be considered in making insert selection.

RECOMMENDED THREAD ENGAGEMENT OF ARMACOIL ASSEMBLIES

Tabulated in multiples of Nominal Diameter of thread

TEMPERATURE RANGES

RELATED MATERIAL SPECIFICATIONS

CHEMICAL COMPOSITIONS OF RELATED STAINLESS STEELS