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Technical information

Dimensional Tolerances of MSS SP 75 Fittings

MSS SP 75 specifies the dimensional tolerances of WPHY butt-welding pipe fittings sized from 16″(DN400) through 60″(DN1500). For fittings 14″(DN350) and smaller, please refer to ASME B16.9.

Dimension-Tolerances of MSS SP 75 Fittings

The minimum wall thickness shall be 0.01 inch under the nominal thickness. Others are illustrated in the table below,

NPSInside Diameter at EndOut of Roundness
At Ends of FittingsThroughout body
of Elbows
ElbowsOther
16-24±0.090.190.122.5%
26-36±0.09*A0.122.5%
38-48±0.12*A0.122.5%
50-60±0.25*A0.122.5%

*A out-of-roundness tolerances at ends shall be 1% of diameter for NPS 26 and larger.

NPS90°,60°,45°,&30° Elbows
& Tees Center-to-End
Dimension
Reducers Overall
Length
Caps Overall Length
Long Radius & Tee3R
16-24±0.09±0.12±0.09±0.25
26-36±0.12±0.25±0.19±0.38
38-48±0.19±0.38±0.38±0.38
50-60±0.25±0.38±0.38±0.38
NPSAngularity off Angle QElbows Off Plane PEccentric and Concentric Reducers Off Plane *B
16-240.090.252.5%
26-360.090.502.5%
38-480.120.752.5%
50-600.190.752.5%

*B Values that are percent of O.D.

*View more technical details of MSS SP 75 pipe fittings.

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