This standard includes recommended sizes of SAE and ISO slraightthread OÂ·ring and fourÂ·bolt flange ports in NFPA standard heavyduty and light duty hydraulic cylinÂ· ders.
This standard intends to:
– encourage the use of SAE OÂ·ring sealed ports;
– promote cylinder interchangeability by establishing uniformO-ring port recommendations.
This standard only applies to the dimensional criteria efproducts manufactured in conformance with this standard. It doesnot apply to their functional characteristics.