SCREW-SERT

DESIGN GUIDE

Preparing the hole

Hole diameter will change slightly based on the type of material in which the insert will be installed (see table). For this reason, we have provided hole diameters by class of material. Preparatory tests will help determine the optimal diameter quickly. For conical holes, the cone angle must not exceed 1° and the specified hole diameters refer to the lowest point reached by the insert. We highly recommend a 60° chamfer at the top of the hole to avoid chipping the surface of the piece.

Hole depth

The depth of a blind hole should be equal to 1.2X the length of the insert.

Installation

The insert is installed by traditional tapping techniques, so you will need a “snap-break” tool to enable the threaded mandrel to come out of the insert after installation. Our install tools may be used for installation, including manual tools (for smaller volumes) or machine tools to be applied to a drill or used with an ordinary tap wrench. For particularly high production volumes, we can provide fully automated equipment. Once installed, the Screw-Sert must be approximately 0.3 mm below the surface of the piece.

Material

• Bichromate case-hardened steel (ROHS) SCT-S;
• Austenitic stainless steel SCT-SS;
• Brass SCT-B;