Aerospace Fastener Applications
Part 2
An Aerospace
Manufacturing
Perspective
1
Aerospace Rivets
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2
Primarily used to fasten aerospace skins to the
sub-structure
Concerned mainly with shear and tension loads.
Two types of rivets:
– Solid Rivet
– Blind Rivet
Aerospace Solid Rivets
3
Aerospace Solid Rivets
4
Aerospace Solid Rivets - Identification
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5
Rivets manufactured in accordance with the AN/MS standards are
identified by a four part code:
1.
AN or MS specification and head type
2.
one or two letters that indicate the material
3.
shank diameter in 1/32nd inch increments
4.
a dash followed by a number that indicates rivet length in 1/16th
inch increments.
Aerospace Solid Rivets - Identification
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Example: rivet identification
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standard universal head solid rivet
Material: 2117-T4 aluminium
1/8 inch diameter
5/16 inch in length
Rivet ID = either AN470AD4-5 or MS20470AD4-5
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Aerospace Solid Rivets - Identification
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7
Same rivet, different material:1100 aluminium
– AN470A4-5 or MS20470A4-5.
AN470 or MS20470 denote the specification for universal head types
AD is the material code for 2117-T4
– (A=1100, B=5056, C=copper, D=2017, DD=2024, F=stainless
and M=Monel)
4 = 4/32 or 1/8 inch diameter
-5 = 5/16 inch length
Aerospace Blind Rivets
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8
Used when you cannot physically access one side of the
work
Blind rivets are hollow, and thus weaker than solid rivets
To retain strength of the joint:
– stronger material, larger diameter rivets, or more are
necessary and of course
20–50% heavier than a solid rivet because of steel stem
Aerospace Blind Rivets
9
Quality Assurance of Aerospace
Fasteners
10
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Aerospace Fasteners Material Selection
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Aerospace Fasteners Testing
Aerospace Fasteners Material
Selection
Background
 Some factors to be considered before material selection
are:
 The max. and min. operating temperatures
 The corrosiveness of the environment
 Fatigue and impact loading
 Always try to use standard fasteners, such as AN, MS,
MIL, NAS, SAE
11
Aerospace Fasteners Material
Selection
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12
Alloy Steels
Aluminum
Titanium
Stainless Steel
Superalloys
Aerospace Fasteners Material
Selection
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13
Aluminum is the predominant material used in the manufacture of
commercial aircraft.
Table 3 lists the typical aluminum alloys used in commercial aircraft.
Basic Aerospace Fasteners
Application
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The basic applications (or needs) for
aerospace fasteners are:
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14
Shear
Tension
Fatigue
Fuel tightness
High temperature
Corrosion control
Aerospace Fasteners Testing
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Analyzing a Joint
–
Calculate all the load required for each type of
joint failure:
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15
Rivet Shear
Sheet Tensile
Bearing
Sheet Shear
Failure will occur in the mode that corresponds
with the lowest load carrying capability.
Aerospace Fastener
Standardization
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Most aerospace hardware is manufactured
per government standards
The three most common aircraft fastener
standards used are:
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16
AN = Air Force/Navy
NAS = National Aerospace Standards
MS = Military Standards
Common Standardized
Fasteners
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17
Bolts
Nuts
Washers
Turnbuckles
Cotter pins
Screws
Rivets
Plumbing fittings (pipes and tubes)