Cylinders
Hollow Rod
Single And Double Acting Three capacities from 4,600 lbs to 11,700 lbs clamp force at rated pressure. Also called “Power Nuts,” hollow cylinders will draw or tighten an appropriately sized bolt to clamp or actuate remote mechanisms. Keyhole shaped bodies make maximum use of space, sized to piston diameter with additional bulk added for the ports only, not the entire body. Easily used to add hydraulics to existing strap clamps or pull against “C” washers. Double acting models push and pull with equal force because both sides of the piston have identical areas.
Bolt size threads in piston ends allow the use of standard bolts or threaded rods for remote actuators. Vent port with bronze filter gives the cylinder a place to “breathe” and helps keep chips and coolants from drawing past wipers (double acting unclamp port or for single acting breather line installation). Pistons are retained by a specially designed end cap which reduces spring stresses allowing them to run longer and require less maintenance.
F-10
Minimum Length (in.)
Oil Capacity (cu. in.)
Cylinder Capacity (lbs.)**
Model No.
Hydraulic Connection
Stroke (in.)
Body Size
Piston Area (sq. in.)
Single Acting (S/A)
Cylinders, actuated hydraulically 1 direction, spring returned.
20-2113-03 21-2113-03 20-2115-04 21-2115-04 20-2120-05 21-2120-05
SAE
4,600
0.25
2.16 X 1.63 X 1.72
2.00
0.920
0.230
SAE and MM
SAE
6,600
0.38
2.44 X 1.95 X 2.22
2.50
1.325
0.500
SAE and MM
SAE
11,700
0.50
2.99 X 2.54 X 2.59
3.00
2.356
1.178
SAE and MM
Double Acting (D/A)
Cylinders, actuated hydraulically both directions.
20-2213-03 20-2215-04 20-2220-05
4,600 6,600
SAE SAE SAE
0.25 0.38 0.50
2.16 X 1.63 X 1.72 2.44 X 1.95 X 2.22 2.99 X 2.54 X 2.59
2.00 2.50 3.00
0.920 1.325 2.356
0.230 0.500 1.178
11,700
** Cylinder capacities are listed at 5,000 psi maximum operating pressure. The output force is adjustable by varying hydraulic pressure. To determine approximate output force, use the following formula: effective piston area times input pressure equals the clamping force (Actual force may vary slightly due to friction and/or return springs.) Dimensions Model No. A B C D
E
F
G
H
Single Acting (S/A) 20-2113-03
2.00
0.25
0.25
1.72
1.63
1.25
2.16
0.97
21-2113-03 20-2115-04 21-2115-04 20-2120-05
2.50
0.38
0.25
2.22
1.95
1.44
2.44
0.94
3.00
0.50
0.38
2.59
2.54
2.00
2.99
1.13
21-2120-05 Double Acting (D/A) 20-2213-03
2.00 2.50 3.00
0.25 0.38 0.50
0.25 0.25 0.38
1.72 2.22 2.59
1.63 1.95 2.54
1.25 1.44 2.00
2.16 2.44 2.99
0.97 0.94 1.13
20-2215-04 20-2220-05
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