WTI Fasteners - our inserts conform to all recognised national and international standards

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Tel: 01530 416888

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sales@wti-fasteners.co.uk

Quality and Design

WTI Inserts conform to all recognised national and international thread and wire thread insert standards.

When installed they provide close tolerance threads which accept both conventional and controlled root radius male threads.

Because of their mechanical advantage, when correctly installed, WTI inserts can easily achieve threaded assemblies where tensile failure of the male thread should occur before insert failure. Clearly a beneficial condition for product design since threaded assemblies can be more accurately calculated around known limits - i.e. bolt yield etc.

The tables listed below provide a basis for such design, by simply plotting pre-determined values for bolt ultimate tensile against shearing strength of parent material, read the resultant length of insert required to obtain the desired condition.

Shear Strength of Parent Matl MPa	Bolt / Male Thread Minimum Ultimate Tensile MPa
Shear Strength of Parent Matl MPa	390	490	590	790	980	1180	1370
70	2D	2.5D	3D
100	1.5D	1.5D	2D	2.5D	3D
150	1D	1.5D	1.5D	2D	2.5D	3D	3D
200	1D	1D	1D	1.5D	2D	2D	2.5D
250	1D	1D	1D	1.5D	1.5D	2D	2D
300	1D	1D	1D	1D	1.5D	1.5D	2D
350	1D	1D	1D	1D	1D	1.5D	1.5D

Shear Strength of Parent Matl 16sF/ft²	Bolt / Male Thread Minimum Ultimate Tensile Tons F/In²
Shear Strength of Parent Matl 16sF/ft²	24	34	43	48	56	59	71	80	98
70	2D	2½D	3D	3D
100	1½D	1½D	2D	2½D	2½D	3D	3D
140	1D	1½D	1½D	2D	2D	2D	2½D	3D
170	1D	1D	1½D	1½D	1½D	2D	2D	2½D	2½D
210	1D	1D	1D	1½D	1½D	1½D	2D	2D	2½D
280	1D	1D	1D	1D	1D	1½D	1½D	1½D	2D
350	1D	1D	1D	1D	1D	1D	1D	1½D	1½D

Note: For intermediate values use the next higher column for bolt tensile and the next lower column for parent material strength.

The above figures assume male thread or bolt is fully engaged along the entire length of insert. The above charts are for general guidance only - for specific applications, WTI Engineering can provide more accurate advice and support.

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