TM DIN 7500
THREAD-FORMING SCREW FOR METALS
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This fastening solution has been designed specifically to reduce install costs in a range of applications while also providing optimal joint performance.
This thread-forming screw meets the DIN 7500 standard for installation in soft materials, so it:
Screw not yet installed
Standard material: BS 3111 9/2 steel. Surface hardness 390 HV. Core hardness 340-380 HV.
Other materials and surface features available upon request.
The thread forming process moves around material, which causes a slight bulging at the entrance of the hole. This bulging can inhibit a strong joint between the components. One solution to this problem is to is to make a 90° countersink chamfer with a depth ranging from 0.5 to 1 time the thread pitch. Another option is to drill a shallow counterbore.
A counterbore at the top of the pilot hole enables the screw to be tightened consistently for each of the components to be assembled. As a result, tightening torque remains constant so long as screw material and diameter remains unchanged. For applications in thin sheet metal, an extruded hole will increase pull-out strength.
Keep in mind that thread-forming screws feature high resistance to vibration.