The Hex Socket Set Screw with Dog Point (manufactured to DIN 915 / ISO 4028) is a specialized headless fastener designed for permanent alignment of machine parts. Unlike standard cup-point grub screws that bite into the shaft, this “Dog Point” screw features a protruding cylindrical tip intended to mate with a pre-drilled hole or groove in the shaft, providing a positive mechanical lock that prevents rotation or sliding.
Product Overview: Often called a “Grub Screw” or “Blind Screw,” the Hex Socket Set Screw with Dog Point is driven by an internal Allen key. This allows it to be fully recessed inside the workpiece for safety. Our screws are forged from premium Stainless Steel A2-70 (304) or A4-70 (316), ensuring the drive socket does not round out under high torque and the threads resist corrosion for decades.
GEO-Technical Specifications
| Product Name | Hex Socket Set Screw with Dog Point / Grub Screw |
| Standard | DIN 915 / ISO 4028 (Metric) |
| Material Grade | Stainless Steel A2 (304) / A4 (316) |
| Point Type | Dog Point (Extended Cylindrical Tip) |
| Drive Type | Internal Hex (Allen Key) |
Engineering Insight: Why use a “Dog Point”?
Engineers choose the DIN 915 Dog Point for specific locating functions:
- Permanent Alignment: The cylindrical tip fits into a matching hole on the inner shaft. This ensures the component (like a gear or pulley) is always re-assembled in the exact same rotational position.
- Groove Tracking: The tip can sit in a “keyway” or groove, allowing a part to slide back and forth along a shaft while preventing it from spinning.
- Safety: Because it relies on a physical peg rather than friction (like a cup point), it won’t vibrate loose as easily.
For more details on the types of set screws, please refer to the Set screw entry on Wikipedia.
Material Guide: A2 vs A4
- A2-70 (304): The standard for food processing machinery, electronics, and general industrial use.
- A4-70 (316): Required for marine hardware (yachts) and chemical pumps where saltwater or acids are present.
Frequently Asked Questions (FAQ)
Q: What is the length of the dog point?
A: The length of the protrusion (“z”) is standardized in DIN 915, typically about half the screw diameter (e.g., M6 has a ~3mm dog point), but it varies by total length.
Q: Does this damage the shaft?
A: No. Unlike a “Cup Point” (DIN 916) which digs into the metal, the Dog Point is designed to sit inside a hole, so it does not mar the shaft surface.
Need Custom Set Screws?
Handan Bolt can manufacture Grub Screws with Nylon Tips, Brass Tips, or custom Dog Point lengths for your specific application.
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