UNC Fasteners in Tension
UNC thread :
1-64 UNC
2-56 UNC
3-48 UNC
4-40 UNC
5-40 UNC
6-32 UNC
8-32 UNC
10-24 UNC
12-24 UNC
1/4-20 UNC
5/16-18 UNC
3/8-16 UNC
7/16-14 UNC
1/2-13 UNC
9/16-12 UNC
5/8-11 UNC
3/4-10 UNC
7/8-9 UNC
1-8 UNC
1 1/8-7 UNC
1 1/4-7 UNC
1 3/8-6 UNC
1 1/2-6 UNC
1 3/4-5 UNC
2-4.5 UNC
2 1/4-4.5 UNC
2 1/2-4 UNC
2 3/4-4 UNC
3-4 UNC
3 1/4-4 UNC
3 1/2-4 UNC
3 3/4-4 UNC
4-4 UNC
SAE Grade Number :
grade 1
grade 2
grade 4
grade 5
grade 5.2
grade 7
grade 8
grade 8.2
Preload as perc. of proof strength :
0.2 Sp
0.3 Sp
0.4 Sp
0.5 Sp
0.6 Sp
0.7 Sp
0.8 Sp
0.9 Sp
1.0 Sp
SI-units
Major diameter d
in
mm
Threads per inch N
-
Pitch P = 1/N
in
Pitch diameter d
p
= d - 0.649519/N
in
Minor diameter d
r
= d - 1.299038/N
in
Tensile stress area A
t
= π/4 ((d
p
+d
r
)/2)
2
10
-3
in
2
Proof strength S
p
kpsi
MPa
Initial preload F
i
lb
kN
1)
Definition of proof load (externally threaded fastener): The tension applied load that a fastener must withstand without any indication of permanent deformation or failure. Proof load is typically calculated at 90-93% of the minimum yield strength.
2)
The yield strength of SAE 5.2 and ISO 8.8 are approximately the same.
www.tribology-abc.com