cylindrical screwed bar provided with a head, generally not threaded along its entire length
NOTE For example: Shank plus threaded portion.
3.2.2 fail-safe
approach in which the structure is designed with sufficient structural redundancy to ensure that the failure of one structural element does not cause general failure of the entire structure
3.2.3 fastener
device used to hold parts firmly together in an assembly
3.2.4 galling
condition whereby excessive friction between high spots results in localized welding with subsequent splitting and a further roughening of rubbing surfaces of one or both or two mating parts
3.2.5 nut
metal collar, screwed internally, to fit a bolt
NOTE Usually hexagonal in shape and operated by a spanner.
Figure description:
The image contains the following information:
- Text: ECSS
- Key Entity: European Cooperation for Space Standardization (ECSS logo.
- Visual Details: The letters are in a stylized, italicized serif font. The letter "E" is in a white box, while "CSS" is in a purple box. Both boxes are enclosed within a purple parallelogram frame.
3.2.6 safe-life
approach which requires that the largest undetected defect that can exist in the structure does not grow to failure when subjected to loads and environments encountered in service
3.2.7 sampling plan
combination of sample size to be used with associated batch acceptability criteria
3.2.8 shank
unthreaded portion of the cylindrical screwed bar of a bolt
3.2.9 stud
shank, or endless bolt, externally screwed from one end, both ends or along its entire length
3.2.10 (screw) thread
helical ridge of approximately triangular, square or rounded section, formed on a cylindrical core, the pitch and core diameter being standardised under various systems
3.2.11 threaded fastener
device composed by a cylindrical screwed bar provided with a head and a metal collar, screwed internally, to fit the cylindrical bar that is used to hold parts firmly together in an assembly