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A part’s listing in this catalog does not guarantee its availability.
To download/print the most current catalog, go to www.lordfulfi llment.com/upload/PC7000.pdf. Rev.1 10/08
Page 101 of 124
DYNAFLEX ELASTOMERIC FLEXIBLE COUPLINGS
Table 2 – Series Arrangement Selection
Dynafl ex Bushing-Type Couplings
Table 1 – Parallel Arrangement Selection
Bolt Circle (in)
12
10
8
6
4
2
0
BUSHING COUPLING SELECTION — N x N SERIES
Curves Based on Compression
Stress σ
c
= 200 psi
(N x N) 2 x 2 3 x 3 4 x 4 5 x 5 6 x 6 7 x 7
8 x 8
9 x 9
10 x 10
12 x 12
MINIMUM BOLT CIRCLE DIAMETER
Torsional Rate: K
θ
= R
2
K
R
Torque: T
= σ
c
• R • d • l (lb/in)
Where: σ
c
= Comp. Stress (psi)
N = No. of Joints
R = Bolt Circle Radius
d = joint l.M., O.D.
l = Socket Length
N
2
lb/in
rad
(____)
N
2
Joint
Number
K
R
Minimum B.C. Dia. "D" For Number of Joints
lb/in 2 3 4 5 6 7 8 9 10 11 12
J-6250-1 6,800 1.77 2.50 3.27 4.05 4.85 5.62 6.41 7.20 8.00 8.78 9.62
J-5915-58 12,000 3.54 5.00 6.52 8.08 9.68 11.25 12.81 14.40 15.98 17.59 19.15
R
MIN
=
r
Sin ( )
180º
N
Where: r = radius of rubber joint
J-6250-2 4 8 12 16 20 24 28 32 36 40 44 48 52 56
J-5915-58 15 30 45 60 75 90 105 120 135 150 165 180 195 210
Bushing Part No. Torque (lb/in x 100)
J-5915-58
J-5737-1
J-6250-2
12
10
8
6
4
2
0
Bolt Circle (in)
BUSHING COUPLING SELECTION
Curves Based on Compression
Stress σ
c
= 200 psi
lb/in
rad
(____)
Torsional Rate:
K
θ
= NR
2
K
R
Torque: T
= σ
c
•N • R • d • l (lb/in)
Where: σ
c
= Comp. Stress (psi)
N = No. of Joints
R = Bolt Circle Radius
d = joint l.M., O.D.
l = Socket Length
N = 2 3 4 5 6 7 8 9 10 11
12
J-5737-1
J-5915-58
R
MIN =
r
Sin ( )
180˚
N
Where r = radius of rubber joint
MINIMUM BOLT CIRCLE DIAMETER
J-6250-2
Joint
Number
K
R
Minimum B.C. Dia. "D" For Number of Joints
lb/in 2 3 4 5 6 7 8 9 10 11 12
J-6250-1 6,800 1.25 1.43 1.77 2.13 2.50 2.89 3.27 3.68 4.05 4.45 4.85
J-5915-58 12,000 2.50 3.00 3.54 4.26 5.00 5.76 6.52 7.32 8.08 8.90 9.68
†
†
J-6250-2 4 8 12 16 20 24 28 32 36 40 44 48 52 56
J-5915-58 15 30 45 60 75 90 105 120 135 150 165 180 195 210
Bushing Part No. Torque (lb/in x 100) † Non-Stock Item