H5251 Dixon Valve Brass Internally Expanded Permanent Coupling - Scovill Style - Female NPSH - 2-1/2" Hose ID

  • Brass internally expanded permanent couplings are recommended for discharge and suction service.
  • Commonly used in the transfer of fuel to homes, airplanes, ships, etc.
  • The working pressure of the 520-H fitting varies with the size of the fitting, the size and construction of the hose and the media being conveyed.
  • Both the male and female have octagonal facets for tightening with a wrench. The female in 1-1/2" and larger sizes has lugs for tightening. The stem is expanded to nominal ID of hose for a rigid, uniform, full-flow area.
  • Male and female stems are machined from bar stock or solid brass forgings; ferrules are available in brass and stainless steel.
  • Couplings are compact, light and streamlined to eliminate catching on curbs and shrubs.
  • The H520 fittings are designed for internal expansion only.
  • Couplings are pre-lubricated for assembly.
Safety Notes:
  • Dixon Holedall stems and ferrules are specifically designed to be used together as a coupling system.
  • Designed for internal expansion only.
  • Do not interchange with other manufacturer's fittings.
  • Do not use a wrench or vice on ferrule.
  • Holedall couplings, regardless of coupling style, are never to be used for steam service at any pressure.
  • Holedall fittings are not to be used with cable reinforced high-pressure hose, 4 or 6 braid wire hydraulic hose or any other service not listed in the recommendations.
  • Strict adherence to ferrule OD range (Internally Expanded) for each hose end to be assembled is essential for satisfactory performance.
  • Internally Expanded Holedall Couplings are not to be used with plastic lined chemical hose.
  • Hose service working pressure (including surges and spikes) is never to exceed the maximum recommended working pressure for the fitting. The assembly's (hose + coupling) maximum working pressure is the lesser of the hose rated working pressure or the coupling rated working pressure.
  • Media being transported through the hose should be compatible with the stem material. Compatibility of ferrule material with the environment in which it will be used is recommended.
Part Number Hose ID Weight (Lbs.)
H5191-BU 3/4" 0.3100
H5211-A-BU 1" 0.4200
H5221-A-BU 1-1/4" 0.6200
H5271-BU* 1-3/8" 0.9000
H5231-A-BU 1-1/2" 0.9400
H5241-BU 2" 1.7300
H5251** 2-1/2" 2.6400
H5261** 3" 3.5700
* 1-3/8" stem has 1-1/2" thread ** 2-1/2" and 3" parts have female NPSM thread