Hardened Steel Screw-Serts

Hole Preparation

Hole diameter will vary with the type of material used. For this reason the data table shows the hole size ranges for the different material classes.

Holes may be cored or drilled. The taper on a cored hole should be 1° inclusive and the hole diameter should apply at the point reached by the bottom of the insert. A 60° countersink at the top of the hole is strongly recommended in order to avoid the risk of chipping to the surrounding surface. The depth of the countersink should be equal to the external thread pitch of the insert. The depth of blind holes must be a minimum of 1.2 x insert length.

Installation

Form a hole in the material to size recommended and install the fastener square in the hole. Apply pressure to the head of the fastener sufficient to totally install the broaching feature into the board, locking the fastener securely in place. Insert fixing screw or bolt from side opposite to the fastener head.

Wall Thickness

The minimum wall thickness will vary with the ductility of the diecasting alloy, but as a general guide wall thickness should not be less than the nominal thread diameter. Specific use of materials like magnesium and applications requiring thinner boss walls may require subtle changes to the design of the insert. In either case consultation with the PSM Technology Centre or local sales office and pre-production testing is essential.

Type of Loading

Direct torque loads should be avoided with this type of insert.