List of MSS Dimensional Standards

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The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for: Valves, Valve Actuators, Valve Modification, Pipe Fittings, Pipe Hangers, Pipe Supports, Flanges and Associated Seals. Here is a list of standards devised by this Institute.

Sr.NumberTitle
1MSS-SP-6Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
2MSS-SP-9Spot Facing for Bronze, Iron and Steel Flanges
3MSS-SP-25Standard Marking Systems for Valves, Fittings, Flanges, and Unions
4MSS-SP-42Class 150 (PN 20) Corrosion Resistant Gate, Globe, Angle and Check Valves With Flanged and Butt Weld Ends
5MSS-SP-43Wrought Stainless Steel Butt-Welding Fittings Including Reference to Other Corrosion Resistant Materials
6MSS-SP-44Steel Pipe Line Flanges
7MSS-SP-45Bypass and Drain Connections
8MSS-SP-51Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
9MSS-SP-58Pipe Hangers and Supports
10MSS-SP-65High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
11MSS-SP-69Pipe Hangers and Suports
12MSS-SP-70Cast Iron Gate Valves, Flanged and Threaded Ends
13MSS-SP-71Gray Iron Swing Check Valves, Flanged and Threaded Ends
14MSS-SP-72Ball Valves With Flanged or Buttwelding Ends for General Service
15MSS-SP-75Specifications for High Test Wrought Buttwelding Fittings
16MSS-SP-79Socket-Welding Reducer Inserts
17MSS-SP-81Stainless Steel, Bonnetless, Flanged, Knife Gate Valves
18MSS-SP-83Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
19MSS-SP-85Gray Iron Globe and Angle Valves, Flanged and Threaded Ends
20MSS-SP-88Diaphragm Type Valves
21MSS-SP-95Swage(d) Nipples and Bull Plugs
22MSS-SP-97Integrally Reinforced Forged Branch Outlet Fittings