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-Aviation
Material & Process
Question | Answer |
---|---|
Dimpling | bents the sheet mechanicly being joint to accomodate the river head |
AN470 | replaces almost all other head designs |
AN430 | use on aircrafts build before 1955 |
AN455 | use on internal structures and applications requiring high head strengh |
1100 aluminum (A) | this rivet lacks suficient strengh for structural applications |
2117 aluminum (AD) | most used for manufacturing and maintenance modern aircrafts, don't requiere heat treatment also known as field rivets |
5056 aluminum (B) | for magnesium structures |
2017 aluminum (D) | modified to 2017 alloy call crack free rivet |
AN | airforce Navy |
MS | military standard |
NAS | national aerospace standard |
SAE | society american engeniers |
SOLID CRACK RIVETS | unlike other type fasteners rivets change in dimention to fit the size of the hole |
RIVET CODES | rivets are given codes for their size, head, and alloy material. Two system AN and MS20 |
AN 470 AD 4 5 | airforce navy, universal head, 2117T4 alloy, diameter 1/32, lenght 1/16 |
how do i measure AN470 rivet | from the bottom of the head to the end of the shank |
how do i measure AN426 rivet | from the top of the head to the end of the shank |
COUNTERSINK | a process in wich metal in the top sheet is cut away in the shape of the rivet head |
CRACK FREE RIVET | a new version of 2017 (D) rivet for jet engines with a minumun shear stregh of 34ksi |
AMERICAN NACIONAL SERIES | have more threads per inche |
AMERICAN STANDARD UNIFIED SERIES | have less threads per inche |
COARSE OR FINE THREADS | assigned by class to fit from 1 to 5 |
CLASS 1 | (loose) you can turn a nut all the way down with fingers like wing nuts |
CLASS 2 | (free) need a wrench all the way down |
CLASS 3 | (medium)need a wrench all the way down |
CLASS 4 | (close) need a wrench all the way down |
CLASS 5 | (tight)need a wrench all the way down |
AIRCRAFT NUTS | are fine thread w/ class 3 whereas screws are tipically a class 2 or 3 fit |
STANDARD AIRCRAFT NUTS | this are identified by diameter and lenght |
AIRCRAFT BOLT MATERIALS | cadmiun plated-nickel steel-corrosion resistan steel-2024 alluminun alloy |
AIRCRAFT BOLTS | unless specify this are made of cadium plated nicke steel, corrosion resistan is identify by the letter c between the diameter and the lenght and 2024 alluminum alloy a DD between the diameter and the lenght |
ALLUMINUM ALLOY AND STEEL BOLTS SMALLER THAN AN3 | FAA forbids the use of this in structural components |
A LETTER A AT THE END OF THE LENGHT OF A BOLT | this means there is no hole in the shank |
AN73 - AN81 | (DRILL HEAD ENGINE BOLTS) BOLTS HEX-HEADED STEEL BOLTS SIMILAR TO AN3 TO AND 20 |
CLOSE TOLERANCE BOLTS | designated as an173 to an186 ground tolerance of +0.000 - 0.0005 inch |
CLEVIS BOLT | an21 to an36 a domed head that is tipically slotted to accept a screwdriver the nut on most clevis bolts are safetied with a cotter pin. |
IF NOTHING IS SPECIFY | it is a good practice to use awasher between the head of the nut and the nut to protect the material. |
AN310 AIRCRAFT CASTLE NUT | identify by the letter D example an310d-6 2017 alluminum alloy |
AN320 SHEAR CASTLE NUT | use only for shear loads on clevis bolts |
AN315 PLAIN NUT | plain nut has no castallations a lock washer must be used, used for either tensil or shear loads. |
AN350 WING NUT | it is use for frequenly removed parts with out tools example an350-616 where 6 is for 3/8 nut and 6/16 inch bolt class 2 (free) |
SELF LOCKING NUTS | two types fiber or nylon and metal |
LOW TEMPERATURE SELFT LOCKING NUT | AN365 class 3 (medium) nylon locknut never to be use in temperatures more than 250f if more than 3 threads expose (FAIL) |
METAL SELF LOCKING NUT | for applications where the temp is more than 250f AN363 |
MACHINE SCREWS | widely use structural same strengh as bolts self-taping to join light materials |
PLAIN WASHERS | AN960 provide smooth surface between the nut and the material |
LOCK WASHERS | when no convinient to use self locking nuts |
SPECIAL WASHER | keyed washer use as a sefety device, small keys to engage slots cut in to bolts |