Stainless Steel Cup Point Grub Screw - Grade 202, 304, 316, A2, A2-70
A Cup Point Grub Screw, also known as a set screw, is a type of headless fastener designed to secure one object within or against another without the need for a protruding head. The cup point is the most commonly used point type and is characterized by a concave or hollowed end.
Technical Specifications – Cup point grub screw
Here is a technical specification table for Cup Point Grub Screws in metric sizes (DIN 916 / ISO 4029 standard):
| Size (M) | Thread Pitch (mm) |
Hex Key Size (mm) |
Length Range (mm) |
Standard |
Material |
| M3 | 0.5 | 1.5 | 3 – 20 | DIN 916 | Stainless Steel / Alloy |
| M4 | 0.7 | 2 | 4 – 25 | DIN 916 | Stainless Steel / Alloy |
| M5 | 0.8 | 2.5 | 5 – 30 | DIN 916 | Stainless Steel / Alloy |
| M6 | 1.0 | 3 | 6 – 40 | DIN 916 | Stainless Steel / Alloy |
| M8 | 1.25 | 4 | 8 – 50 | DIN 916 | Stainless Steel / Alloy |
| M10 | 1.5 | 5 | 10 – 60 | DIN 916 | Stainless Steel / Alloy |
| M12 | 1.75 | 6 | 12 – 60 | DIN 916 | Stainless Steel / Alloy |
| M16 | 2.0 | 8 | 16 – 80 | DIN 916 | Stainless Steel / Alloy |
| M20 | 2.5 | 10 | 20 – 100 | DIN 916 | Stainless Steel / Alloy |
- Headless Design: Fully threaded with no head; sits flush or below the surface.
- Cup Point: Slightly concave end digs into the mating surface for a secure hold.
- Thread Types: Typically available in metric (M series) or imperial (UNC/UNF).
- Drive Style: Most commonly hex socket (Allen key) driven.
- Stainless Steel (A2, A4)
- Alloy Steel (hardened)
- Brass or Nylon tip variants available for softer surfaces
- Plain (self-colored)
- Black oxide
- Zinc-plated
- Provides a strong, reliable hold in rotating assemblies
- Minimal surface protrusion—ideal for moving parts
- Reusable and easy to install/remove with the correct hex key
The cup point grub screw, also referred to as a socket set screw with a cup point, has a concave indentation at its tip that enables it to securely grip onto shafts or other cylindrical parts. This particular structure is effective in keeping parts such as gears, collars, or knobs in place on the shaft. Its cup shape offers greater hold and is gentler on the shaft compared to cone point screws.
Material
Stainless Steel (A2, A4)
Hardened
Alloy Steel
Finish Options
Plain, Black oxide & Zinc
Standard
DIN 916
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