Verus Works U

A synopsis of common aerospace standards for hydraulic applications

AN fitting

37° metal to metal flared fitting for hydraulic hoses and metal tubing.  Similar to a JIC 37° fitting but AN meets aerospace standards for materials and threads (e.g., UNJ threads) and hence is a more stringent specification.

AS478

Defines identification marking methods for aerospace fittings.

AS930

Specifies straight thread fittings that typically mate with AS5202 or MS33649 ports.  Threaded fittings include valves, hydraulic tube connectors, and plugs that thread into bosses and manifolds.

AS934

Specifies straight thread fittings.  One end is an AS930 fitting that mates with AS5202 or MS33649 ports.  The second end is an AS4395 fitting for connecting tubes and hoses.

AS4350

Hex head plug.  Mates with AS5202 or MS33649 ports.  Sizes -04 through -12 in increments of two and -16 through -32 in increments of four.

AS4375

Functionally equivalent to AS33514.  May eventually replace (supersede) AS33514.

AS4395

Flared AN type 37° fitting.  Male with external threads.  Mates with hose or tube having a female fitting meeting the AN standard.

AS4875

Specifies material, heat treatment, and finishes for straight thread or flanged aerospace fluid connection fittings.  For example, an AS930 aluminum manifold plug can be made from either 2024-T6 or 7075-T73 and must be anodized blue (2024-T6) or brown (7075-T73).

AS5202

Specifies port designs with straight threads in bosses and manifolds.  Ports typically mate with AS930 type fittings.  Port sizes are specified in 1/16” increments using dash numbers, e.g., -04 = 4/16ths or 1/4.  Superseded MS33649.

AS8879

Specifies “J” type threads (controlled root radius) for military and aerospace applications.

AS33514

Superseded MS33514.  Specifies fitting end for flareless tube connections.  24° fitting.  Mates with NAS 1760 or equivalent fittings on hoses and tubing.  Two styles of AS33514 fittings:  G (round…no hex) and E (hex…allows for gasket seal).  Note:  Common to have fittings in which one end is an AS930 threaded fitting (for installation in an AS5202 port) and the other end is an AS33514 threaded fitting (for connecting hydraulic tubing).

Mil-S-8879

Superseded by AS8879.

MS33649

Superseded by AS5202.  Specifies port designs in bosses and manifolds.

MS33656 

Superseded by AS4395.

MS33657

Superseded by AS4396.