fasteners
Posted: Wed Apr 11, 2018 9:46 am
The question on fasteners came up and I posted this in the wrong place. Some thoughts based on my experiences with them.
https://www.astm.org/Standards/fastener-standards.html
And then there are Fed Spec'd fasteners (and other processes within some of the specs shown here) such as AN, NAS, AND, MIL and so on. Add to that you have the metric specs and (probably) specs from each country around the world plus fasteners made by companies that are also speced to their needs. I am not sure I have covered all of the problems either. It is all very confusing and what you get from off-shore (or even withing the states) can be very questionable.
Fed specs. have a lot of close tolerance fitting and testing requirements found within the specs applicable each batch of fasteners produced. Not sure about a lot of the other manufactures standards. The ones I worked on their design or worked with were tightly controlled (its hard to replace a bolt at 34K feet in the air ). There were grounded airplanes at times when the test (et al) data did not arrive with the fasteners or within the time allotment.
https://www.astm.org/Standards/fastener-standards.html
And then there are Fed Spec'd fasteners (and other processes within some of the specs shown here) such as AN, NAS, AND, MIL and so on. Add to that you have the metric specs and (probably) specs from each country around the world plus fasteners made by companies that are also speced to their needs. I am not sure I have covered all of the problems either. It is all very confusing and what you get from off-shore (or even withing the states) can be very questionable.
Fed specs. have a lot of close tolerance fitting and testing requirements found within the specs applicable each batch of fasteners produced. Not sure about a lot of the other manufactures standards. The ones I worked on their design or worked with were tightly controlled (its hard to replace a bolt at 34K feet in the air ). There were grounded airplanes at times when the test (et al) data did not arrive with the fasteners or within the time allotment.
Lee
https://www.astm.org/Standards/fastener-standards.html
And then there are Fed Spec'd fasteners (and other processes within some of the specs shown here) such as AN, NAS, AND, MIL and so on. Add to that you have the metric specs and (probably) specs from each country around the world plus fasteners made by companies that are also speced to their needs. I am not sure I have covered all of the problems either. It is all very confusing and what you get from off-shore (or even withing the states) can be very questionable.
Fed specs. have a lot of close tolerance fitting and testing requirements found within the specs applicable each batch of fasteners produced. Not sure about a lot of the other manufactures standards. The ones I worked on their design or worked with were tightly controlled (its hard to replace a bolt at 34K feet in the air ). There were grounded airplanes at times when the test (et al) data did not arrive with the fasteners or within the time allotment.
https://www.astm.org/Standards/fastener-standards.html
And then there are Fed Spec'd fasteners (and other processes within some of the specs shown here) such as AN, NAS, AND, MIL and so on. Add to that you have the metric specs and (probably) specs from each country around the world plus fasteners made by companies that are also speced to their needs. I am not sure I have covered all of the problems either. It is all very confusing and what you get from off-shore (or even withing the states) can be very questionable.
Fed specs. have a lot of close tolerance fitting and testing requirements found within the specs applicable each batch of fasteners produced. Not sure about a lot of the other manufactures standards. The ones I worked on their design or worked with were tightly controlled (its hard to replace a bolt at 34K feet in the air ). There were grounded airplanes at times when the test (et al) data did not arrive with the fasteners or within the time allotment.
Lee