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SAE ARP4919

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SAE ARP4919 1998 Edition, May 1, 1998 Fluid Connections, Fittings, Hex Width
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Description / Abstract: This SAE Aerospace Recommended Practice (ARP) is intended as a guide toward standard practice for selection of nominal hex widths for fittings.

Field of Application:

Primarily for fittings which are machined from bar stock and incorporate a hex wrenching surface. The document applies to union fittings (both ends the same size). For reducer fittings, use the hex width for the largest fittings end.