In the past, 8640 alloy was used in the manufacturing of only the most
critical Aerospace and other special High Strength requirements. Now everyone
can have this Superior Quality and Strength, with the "Off The Shelf" F-911
Hex Cap Screws and at prices comparable to other so called "Grade 9" bolts.
What does 8640 Alloy offer? For starters, up to 50% more Chromium content
and the substantial addition of Nickel, the ingredient that makes this Alloy
tough. With higher Rockwell Hardness that the F-911 specification requires
to achieve an over 190,000 P.S.I. Tensile Strength average, only 8640 Alloy
can reach these lofty goals with superiority.