Historical
ANSI/(NFPA)T3.6.54 R1-1997 (R2004)
Hydraulic fluid power - Cylinder ports - SAE straight thread O-ring and four-bolt flange ports - ISO straight thread O-ring and four-bolt and four-bolt flange ports - Heavy duty and light duty square head tie rod cylinders
This standard includes recommended sizes of SAE and ISO straight thread O-ring and four-bolt flange ports in NFPA standard heavy duty and light duty hydraulic cylinders.
National Fluid Power Association [nfpa-fluid]