| Description |
An externally threaded fastener with unified threads, a cylindrical head with flat chamfered top surface, knurled cylindrical sides and hexagonal recess, made from austenitic stainless steel. |
Applications/
Advantages |
Superior resistance to corrosion though less tensil and yield strength than alloy socket head cap screws. They retain their mechanical and performance capabilities at higher than ambient temperatures.
|
| Material |
Cap Screws shall be made from one of the followinf stainless alloys: 302, 303, 304, 305, 384, XM1 or XM7. |
| Heat Treatment |
The austenitic alloys develop their strength through work hardening during the fastener manufacturing process, as seen from the hardness properties below. The only heat treatment normally available on austenitic stainless alloys is annealing, which is done at approximately 1900°F to a dead soft condition and is not normally thermally reversible. |
| Hardness |
Rockwell B80 minimum |
| Tensile Strength |
80,000 psi minimum |
| Yield Strength |
30,000 psi minimum |
| Elongation |
10% minimum (applies to machined specimens of length at least 4D where D equals the normal screw diameter) |
| Reduction of Area |
30% minimum (applies to machined specimens) |
