ENGINEERING DATA FEATURES The   main   objective   in   this   square   head   design   is   to provide  a  cylinder  to  fit  minimum  space  requirements, coupled with maximum strength and wear characteristic. The only parts subject to wear are the piston cups, rod packing   and   bearing,   The   life   of   these   part’s   greatly increased  because  of  the  mechanical  stability  inherent in   the   extra-long   piston   rod   bearing.      This   reduces maintenance worries and costly downtime. The   standard   cylinder   has   a   wide   versatility   of population since all mountings are interchangeable with all  NFPA/JIC  cylinders.    Cylinders  may  be  mounted  in any   position.      The   piston   stroke   is   made   to   your specification, even to the fraction of an inch. PRESSURES Series  'H'  cylinders  are  rated  at  3,000  P.S.I.  operating pressure.      Certain   mounting   styles   may   be   used   in higher pressure non-shock applications.  Please consult your distributor. TEMPERATURE RANGE Sees   'H'   cylinders   are   designed   to   perform   well   in continuous operation at temperatures ranging from -30° F.  to +200°  F.    If  your  needs  should  extend  into  other operating    temperatures,    consult    our    distributor    for specific   recommendations,   giving   temperature   range, medium, and cycle time. LUBRICATION Series   'H'   cylinders   are   designed   for   oil   operation, lubricated   with   mineral   or   petroleum-base   oils.      For special   acetic   or   gaseous   fluids   or   where   synthetic lubricants  are  used,  consult  our  distributor,  giving  full details and information. MOUNTING Standard  NFPA/JIC  mounting  styles  are  shown  in  this catalog.          For     special     mountings     or     combination mountings, contact our distributor. PORTING Standard cylinders will be furnished with NPTF ports. SAE straight thread 'O' ring ports, in comparable size to pipe port can be had optionally at no extra cost.  Where mounting clearances permit, the ports can be had in any of   four   positions   in   either   head,   Indicate   both   port locations   by   position   number   1,   2,   3,   or   4.      Unless otherwise    specified,    the    ports    will    be    furnished    in position number 1 (Port position numbers can be located on each mounting specification diagram.) CUSHIONS Cushioning   is   achieved   by   trapping   oil   between   the piston and cylinder head, then allowing the oil to escape at   a   predetermined   rate.      This   is   accomplished   by closing off the normal oil passage a the piston nears the cylinder   head,   trapping   and   bleeding   oil   through   an adjustable needle valve. Cylinder  may  be  furnished  cushioned  at  both  ends or  at  either  end.    If  only  one  end  of  the  stroke  is  to  be cushioned,   in   designating   the   end   of   the   cylinder   at which  this  cushion  action  is  to  take  place,  the  ends  of the cylinder should be referred to as the 'Head" or 'Rod" end, and the other end as the "Cap" or 'Blind" end.  This will avoid confusion and delay. Cushioning   is   designed   to   properly   cushion   the cylinder  and  is  NOT  intended  to  cushion  large-inertia loads.  Cushions are not a substitute for speed controls, or deceleration valves. ADJUSTABLE CUSHION VALVE The    needle    valve    provided    on    cushioned    cylinders permits  infinite  adjustment  of  the  cushioning  effect  to any   degree   desired.      The   cushion   adjust   valve   is supplied    at    position    #2    standard    unless    otherwise specified.      A   cushion   ball   Check   is   at   position   #4 standard. NOTE:   Some   cylinder   and   rod   combinations   will have  a  fixed  cushion  on  the  rod  end  and  not  have  a needle valve adjustment. PISTON ROD The standard piston rod is cold drawn carbon steel with an induction hardened case of 50 Rc.  It is hard chrome plated   and   finished   to   16   microinches,   providing   a smooth,   hard.      dent   and   abrasion   resistant   surface. These features extend seal and bearing life and reduce maintenance cost. ROD PACKING CARTRIDGE Our   rod   packing   cartridge   is   designed   as   a   unitized assembly,   made   of   SAE   660   bearing   bronze.      The unitize     rod     cartridge     is     easily     removable     without disturbing  the  torque  on  the  tie  rods  and  by  using  a standard   Allen   wrench.      The   piston   rod   bearing   is exceptionally     long,     providing     excellent     piston     rod alignment,  and  contributing  to  the  very  long  life  of  the cylinder. ROD SEAL A   polyflex   seal   is   employed   to   seal   the   piston   rod, providing a virtually zero leak seal with long life and with friction  held  to  a  minimum.    The  highly  resilient  lip  is pressure-actuated and wear compensating, giving complete reliability after millions of cycles. ROD WIPER The  rod  wiper  is  urethane,  of  the  projecting  lip  type. The recess in the cartridge will accept any MS28776 (or AN6231)    standard    rod    wiper.        Alternate    materials include teflon or brass. PISTON A special close grained nodular iron casting is used for a one-.a piston.  The piston is piloted and torqued onto the piston rod with thread size adjusted to rod diameter. LOCTITE   is used to chemically lock and S the Ion to the rod permanently. PISTON SEAL Polyflex seals are furnished as standard.  and provide a virtually   zero   leak   seal.      These   seals   are   generally accepted    by    engineers    as    the    most    effective    seal available. TOLERANCES All dimensions are in inches.  Stroke length tolerance is ± 1/32, Closerr tolerance can be had at extra cost.