TABLE IV.
Mechanical property values for nuts. - Continued
Heat treatment or
Nominal size
Proof stress for 1
condition
(inches)
hex nut (ksi min)
Rockwell hardness
Material
As formed or stress
400
All sizes
80
relieved
As formed or stress
6
405
All sizes
80
relieved
Nickel
Annealed and age
500
All sizes
130
C24 min
hardened
9
9
2¼ or less
120
B85-C35
9
Annealed
625
9
9
B85-C35
Over 2¼
110
2024
T4
All sizes
55
Aluminum
6061
T6
All sizes
40
7075
T73
All sizes
52
8
Titanium
T7
Annealed
All sizes
120
Notes:
1 To determine minimum proof stress for nuts other than hex nuts use the following:
(a) Proof stress for jam nuts (all materials) = 0.60F.
(b) Proof stress for heavy hex nuts (ferrous) = 1.10F.
(c) Proof stress for heavy hex nuts (nonferrous) = 1.08F.
(d) Proof stress for slotted nuts (all materials) = 0.80F.
(where F = proof stress for hex nut.)
2 There is no minimum in the commercial specification.
3 HRB 97 was used instead of HRC 19 because the Rockwell C hardness range does not cover HRC 19.
4 The commercial specification has a higher minimum.
5 The commercial specification has a higher maximum.
6 The commercial specification has a lower minimum.
7 The commercial specification has a lower maximum.
8 The commercial specification has a higher minimum.
9 There is no commercial fastener specification for this fastener
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