FF-S-85D
3.2.2.2 Ferritic and martensitic. Unless otherwise specified in the invitation
for bids, contract or order, mechanical properties of ferritic and martensitic
corrosion-resisting steel cap screws shall conform to the following:
a.
Ultimate tensile strength
70,000 p.s.i. min.
b.
Yield strength (0.2% offset)
40,000 p.s.i. min.
c.
Brinell hardness
B235 max
d.
Elongation
15
e.
Reduction in area
45
3.2.3 Non-ferrous cap screws. Unless otherwise specified in the invitation
for bids, contract or order, mechanical properties of non-ferrous cap screws
shall conform to Table IA, as specified (see 6.2).
Mechanical Properties of Screws of the Non-Ferrous Materials.
TABLE IA.
Tensile
Temper code
strength
Yield strength at 0.2
Elongation
Applicable
UNS No.
or
p.s.i.
percent offset or at
minimum
specifica-
Material
or
Condition
minimum
extension indicated
tions
Class
minimum
extension
p.s.i
under
load
Manganese
ASTM B138
C67500
O60
55,000
22,000
0.5
20
bronze
percent
Aluminum
ASTM B150
C63200
TQ55
90,000
37,000
0.5
18
bronze
O20
percent
O25
Phosphor
ASTM B139
C51000
H04
60,000
33,000
--
15
bronze
Silicon
ASTM F468
C65100
-
60,000
40,000
0.5
10
bronze
percent
H04
C46200
25 2/
60,000
27,000
0.5
or
Naval brass
ASTM B21
or
percent
O50
C46400
10 3/
62,000
40,000
0.0058
Aluminum
SAE-AMS-
Solution
inch per
alloy 2024
QQ-A-225/6
-
heat-treated
inch
temper T4
10 3/
Aluminum
SAE-AMS-
Age hardened
42,000
35,000
0.0055
alloy 6061
QQ-A-225/8
-
temper T6
inch per
inch
20 1/
Nickel-
QQ-N-281
Class A
80,000
40, 000 0.0071
copper alloy
inch in
2 inches
Nickel-
20 1/
QQ-N-286
Class A
Form 1
130,000
90,000
0.0109
copper-
inch in
aluminum
2 inches
alloy
1/
In 2 inches (min)
2/
In 4 times diameter or thickness (min)
3/
In 2 inches or 4 times diameter (min)
3.3 Dimensions and tolerances. Cap screws shall conform to the dimensions and
tolerances of ASME B18.2.1 and B18.6.2 except as specified herein.
3.3.1 Lengths. Unless otherwise specified (see 6.2), cap screws shall be
furnished in the following length increments:
Lengths up to 1/2 inch incl - 1/16 inch increments.
over 1/2 to 1 inches incl - 1/8 inch increments.
over 1 to 5 inches incl - 1/4 inch increments.
over 5 inches - 1/2 inch increments.
7
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