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NFPA/T3.20.15-1990 (R2016)Standard Title:Hydraulic fluid power – Quick-action coupling – Flush face typeReferenced Standards:ANSI/B93.2-1986, NFPA/T3.20.1 R1-1989, NFPA/T2.10.1M-1978 (R1986), ANSI/(NFPA)T3.20.2 R2-1991, NFPA/T2.6.1 R1-1991Standard Scope:1.1 To include dimensions and performance requirements of a flush face valved coupling with both connected and disconnected sealing capabilities. 1.2 This Standard defines dimensional interchange only and does not guarantee functional interchange. 1.3 Series "A" is intended for medium duty service, i.e., hand tools and rigid mountings. Series "B" is intended for heavy duty service, i.e., hose lines and other areas subject to abuse or rough handling. 1.4 To promote interchangeability of quick-action coupling halves of the same rating. 1.5 To discourage interchangeability of quick-action coupling halves of different ratings.