Description
The Hexagon Set Screw with a Concave End (also known as a Cup Point) is the ultimate choice for high-torque, permanent fastening in extreme environments. Forged from premium 316 stainless steel, these fasteners offer the highest level of corrosion resistance available in standard hardware, making them the industry standard for marine, chemical processing, and medical applications.
Designed for maximum "bite," the concave (cup) end features a thin, sharp rim that digs into the mating surface to create a powerful mechanical bond. This ensures that pulleys, gears, and collars remain immovably fixed to shafts, even when subjected to intense vibration or heavy centrifugal forces. As a headless stainless steel screw, it allows for a completely flush installation via its internal hex socket drive.
Features & Benefits
- Marine-Grade 316 Stainless Steel: Engineered for the toughest conditions, the 316-grade alloy provides superior resistance to chlorides and salt spray compared to standard 304 steel. It is virtually rust-proof and maintains its integrity in humid or chemically aggressive environments.
- High-Security Concave End Design: The "cup point" rim is specifically designed to penetrate the mating surface. This prevents lateral slippage and ensures the set screw stays locked in place, providing significantly higher holding power than flat-end alternatives.
- Precision Hex Socket Drive: The internal hexagon drive system allows for high-torque tightening without the risk of "cam-out" or stripping the head. This ensures a firm, permanent lock that is resistant to loosening under constant mechanical vibration.
- Superior Load Stability: Featuring deep, precision-cut threads and a high-strength core, these fasteners resist deformation under extreme pressure. The uniform thread pitch ensures even force distribution, preventing the screw from backing out under load.
Specification
|
Thread specification -d |
M1.6 |
M2 |
M2.5 |
M3 |
M3.5 |
M4 |
M5 |
M6 |
M8 |
M10 |
M12 |
M14 |
M16 |
|
|
Pitch -p |
0.35 |
0.4 |
0.45 |
0.5 |
0.6 |
0.7 |
0.8 |
1 |
1.25 |
1.5 |
1.75 |
2 |
2 |
|
|
n |
nominal |
0.7 |
0.9 |
1.3 |
1.5 |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
6 |
8 |
|
max |
0.724 |
0.902 |
1.295 |
1.545 |
1.545 |
2.045 |
2.56 |
3.08 |
4.095 |
5.095 |
6.095 |
6.095 |
8.115 |
|
|
min |
0.711 |
0.889 |
1.27 |
1.52 |
1.52 |
2.02 |
2.52 |
3.02 |
4.02 |
5.02 |
60.2 |
6.02 |
8.025 |
|
|
Applicable wrench |
0.7 |
0.9 |
1.3 |
1.5 |
1.5 |
2 |
2.5 |
3 |
4 |
5 |
6 |
6 |
8 |
|
FAQ:
Q1: What is a hexagon set screw used for?
A: Hexagon set screws are used to secure components such as shafts, collars, and gears without a protruding head, ensuring a clean and compact assembly.
Q2: What is the benefit of a concave end set screw?
A: The concave end improves grip, reduces slippage, and minimizes surface damage, making it suitable for soft or precision-machined components.
Q3: What makes the "Concave End" better for vibration?
A: The sharp edges of the concave rim actually "dig" into the shaft. This creates a small circular indentation that acts as a mechanical lock, making the Hexagon Set Screw much more resistant to loosening from vibration compared to flat or oval points.
Q4: Why should I choose 316 over 304 stainless steel?
A: If your application involves saltwater, salt air (coastal regions), or exposure to harsh cleaning chemicals, 316 stainless steel is essential. It contains molybdenum, which prevents pitting and "tea staining" that can occur with 304 steel.
Q5. Does the concave end damage the shaft?
A: Yes, by design, the cup point will leave a small circular mark on the mating surface. If your application requires frequent adjustments and you wish to keep the shaft pristine, we recommend using a Slotted Head Set Screw with a flat end instead.
