Advantages
- Easy press-in insertion
- Self-locking action on the screw - ideal where vibration is present
- Suitable for most thermosetting plastics
Selection of Inserts
ISO Metric
Unified
Other materials and lenghts 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. The top of the hole should not be chamfered or counterbored and care must be taken to avoid bell mouthing. Drilled holes may be used but performance may be reduced when compared with a moulded hole. Hole diameter tolerance: -0.00 +0.10mm.
Selection of Insert Type
Headed inserts may be used for improved electrical contact or to fill gaps which would result in a jack-out condition. Alternatively a reverse headed type may be used with the head on the back of the moulding. This head then gives extra support for resistance to jack-out loads. These inserts are not recommended for use in thermosetting polyesters with high filler content (DMC, SMC, BMC), for applications using these materials we recommended Screw-Sert.
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 the final clamp torque is applied.
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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