Advantages
- Degree of self-locking action on screw
- High pull-out and torque performance
- Easy press-in insertion
- Suitable for most thermoplastics
Selection of Inserts
ISO Metric
Unified
Other materials and lengths possible on quotation.
Specifying an Insert
Boss Design Specification
Hole Preparation
Moulded holes are recommended wherever possible. The taper on a moulded hole should be 1° inclusive and the hole diameter recommended should apply at the point reached by the bottom of the insert. Drilled holes may be used but performance may be reduced when compared with a moulded hole. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Hole diameter tolerance: -0.00 +0. 10mm.
Direction of Loading
The fixing screw must always be assembled from the knurled end of the component to develop the necessary expansion action.
Influence of Screw Dimensions
It is important that the fixing screw fully penetrates the insert in order to achieve full expansion, screw length should therefore be calculated to ensure that this condition is met before final clamp torque is applied.
Wall Thickness
A general guide to minimum wall thickness is given in the data table but this will vary depending upon the nature of the plastic. Where thinner walls are required these can often be accommodated, but consultation with the P.S.M Technology Centre or local sales office and pre production testing is strongly advised.
Performance Data
The complexity of materials and variations in service conditions make it impossible to detail fastener performance for specific applications. The chart below gives a general guide and show the relative performance of the inserts in the range.
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