Sheffer C20 User Manual
C20 SERIES
Cast Iron Pneumatic Cylinders
Pressure Rating 200 PSI
Fine grain, high tensile cast iron heads and
caps are the finest that modern foundry
skill can produce. They are machined to
exacting standards.
Piston rods have a minimum expected
yield of 100,000 psi. They are ground, polished, and hard chrome plated for wear
and corrosion resistance. Four wrench flats
are standard.
The tube is a high tensile, special
Aluminum alloy with a hard anodized finish. The file-hard finish offers long life and
amazing lubrication holding properties.
Also available in steel and fiberglass.
Maximum strength is obtained through a
prestressed tie rod assembly.
Pistons are machined from a fine grain
alloy cast iron. They are of one piece
design to give full thickness bearing and
engineered for fast, positive inflation of
seals.
Cushion insert sandwiched between the
tube and head (or cap) is sealed with a
pressure-activated O-RING (16A).
Static seals at tube ends are confined, precision cut gaskets.
Modified U-cup seals are Buna-N compound. They are self-adjusting to pressure
and wear and their design permits simple
replacement – no need to disassemble the
piston from the piston rod.
The replaceable rod bearing is made of oil
impregnated sintered bronze for lubricated
long life.
Synthetic wiper, steel encased, is designed
to wipe off abrasive dust and contaminates
on the retract stroke to insure long life for
packings, rod bearing, and piston rod.
This type of wiper is efficient, has low friction, and can be replaced without disassembly of the cylinder.
Modified U-cup design offers long life with
minimum friction. It is self-adjusting to
pressure and wear. Seal material is a standard Buna-N compound. The rod seal can
be replaced without disassembly of the
cylinder.
Is O-Ring sealed and can be rotated to
any position for easy accessibility. When
shipped, cushion adjusting screws will be
in positions 1 and 5 (see PORT POSITIONS
in Rod Ends and Porting Page 7.
A modified U-cup gives positive
sealing during cushioning and free
flow of air for rapid acceleration out of
cushion. No check valve is needed.
C20 Series cylinders can be ordered with
no cushions, cushioned front, cushioned
rear, or cushioned both ends.
1,2
Head and Cap
BORE SIZES 11/2" THRU 10"
Construction
28
24
25 16B
30
31
4
29 43
16A
30
31
14
3
27
21 1
71
33
5
9
18
72
29
2
13
3
Piston Rod
4
Tube
5
Tie Rods
9
Piston
16A
Cushion Insert Seals
16B
Tube End Seals
18
Piston Seals
21
Rod Bearing
24
Rod Wiper
33
71, 72
Cushions
25
Rod Seal
30
Cushion Adjusting Screw
1
C20-1
CLEVIS
MOUNT
TRUNNION
MOUNT
EFFEC- EFFEC-
MM TIVE TIVE
ROD AREA AREA 50 PSI 80 PSI 90 PSI 100 PSI 150 PSI
BORE DIA. PUSH PULL PUSH PULL PUSH PULL PUSH PULL PUSH PULL PUSH PULL
11/2
1
/2 1.767 1.571 88.4 78.6 141.4 125.7 159 141.4 176.7 157.1 265 235.6
2
1
/2 3.14 2.946 157 147.3 251.2 235.7 282.6 265.1 314 294.6 471 441.9
21/2
5
/8 4.91 4.60 245.5 230 392.8 368 441.9 414 491 460 736.5 690
3
3
/4 7.07 6.63 353.5 331.5 565.6 530.4 636.3 596.7 707 663 1060 994.5
31/2
3
/4 9.62 9.18 481 459 769.6 734.4 865.8 826.2 962 918 1443 1377
4 1 12.57 11.78 628.5 589 1006 942.4 1131 1060 1257 1178 1886 1767
5 1 19.64 18.85 982 942.5 1571 1508 1768 1696 1964 1885 2946 2828
6 1 28.27 27.49 1414 1374 2262 2199 2544 2474 2827 2749 4240 4124
7 11/4 38.49 37.26 1924 1863 3079 2981 3464 3353 3849 3726 5774 5589
8 13/8 50.27 48.78 2514 2439 4022 3902 4524 4390 5027 4878 7540 7317
10 13/4 78.54 76.13 3927 3807 6283 6090 7069 6852 7854 7613 11781 11420
FORCE DEVELOPED ON PUSH STROKE
FORCE DEVELOPED ON PULL STROKE
Force (in lbs.) = Area of Piston (in sq. inches) times
Pressure (in psi).
Force (in lbs.) = Area of Piston (in sq. inches) less Area
of Rod (in sq. inches) times Pressure (in psi).
F=AP
F=(Ap-Ar) P
Parts List
ITEM QUANTITY
NUMBER DESCRIPTION REQUIRED
1 HEAD 1
2 CAP 1
3 PISTON ROD 1
4 TUBE 1
5 TIE ROD 4, 6, 8
9 PISTON 1
13 TIE ROD NUT ‡
14 PISTON ROD NUT 1
16 A† TUBE SEAL – O-RING 2
16 B† TUBE SEAL – GASKET 2
18 † PISTON SEAL 2
21 † ROD BEARING 1
24 † ROD WIPER 1
25 ROD PACKING 1
27 ROD PACKING SUPPORT WASHER 1
28 ROD PACKING RETAINING RING 1
29 CUSHION PISTON **
30 CUSHION ADJ. SCREW *
31 † SEAL – CUSHION ADJ. *
33 † CUSHION SEAL – FRONT *
43 † CUSHION SEAL – REAR *
71 CUSHION INSERT – FRONT *
72 CUSHION INSERT – REAR *
112 CLEVIS PIN AND RETAINERS 1
117 INTERMEDIATE TRUNNION 1
†Recommended Spare Parts
*As required: specify if cushioned front, cushioned rear or cushioned both ends.
**Used on all cushioned front cylinders. Used on cushioned rear cylinders bore sizes 11/2" and 2" only.
‡As required – depends on bore size and mounting.
112
117
Parts List
Theoretical Force in Pounds at Various Pressures (In PSI)
1
C20 -2
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