Set Screw / Grub Screw (DIN 913 / 914 / 915 / 916)
Set screws (also called grub screws) are headless threaded fasteners with a hex-key (or slotted) drive in one end and a working point in the other. They are used to lock collars to shafts, secure pulleys, or apply pressure within an assembly. The point shape (flat, cone, cup, dog) determines the holding mechanism.
Specifications
| Point Standards | DIN 913 (flat), DIN 914 (cone), DIN 915 (dog), DIN 916 (cup) |
|---|---|
| Drive | Hex socket (most common), Slotted, Square |
| Property Class | 45H (hardened) standard |
| Diameter | M3 – M20 |
| Material | Carbon steel hardened, Stainless 304/316 |
| Surface Finish | Black oxide, Plain, Stainless |
Frequently Asked Questions
Which set screw point should I use?
Cup point (DIN 916) is the most common general-purpose — it grips a flat shaft surface and resists rotation. Flat point (DIN 913) is for soft shafts where you don't want to mar the surface, used with a flat machined on the shaft. Cone point (DIN 914) gives the highest holding power but permanently marks the shaft. Dog point (DIN 915) engages a hole in the shaft for positive non-rotational locking.
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