Cup-point, slotted set screws, defined in the DIN 438 standard published by the German Standardization Institute (DIN), are headless and fully threaded screws with a slotted driver at one end and a cup-shaped (concave) surface at the other end. They must be passed through pre-drilled aligned holes that allow tightening against the countershaft. This type of set screw is best used with a spindle made of softer material, as the concave surface grips well and resists movement well.
Similarly, the ISO 7436 standard published by the International Organization for Standardization (ISO) describes the characteristics of products with metric dimensions and thread sizes from M 1,6 to M 12 and product class A (p. ISO 7436 Cup-point slotted set screws). This standard also includes specifications relating to international standards, presents thread sizes from M 1,6 to M 12 in tabular form for nominal lengths from 2 mm to 60 mm, and provides an example for selection. If other specifications are required, it is recommended to comply with existing international standards such as ISO 261, ISO 888, ISO 898, ISO 965, ISO 3506, ISO 4759/1.
Requirements for cup-point slotted setscrews are included in the DIN 438 standard under the following headings:
Cup-tipped slotted setscrew types have many uses. Such screws are produced in many different designs depending on the place of use and the way of application.
Our organization, among the numerous tests, measurements, analyses, and evaluations it provides for businesses in various sectors, also offers testing services for cup-point set screws according to the DIN 438 standard and for cup-point slotted set screws according to the ISO 7436 standard, with its trained and expert staff and advanced technological equipment.
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