In complex industrial piping networks, the reliability of small branch connections to main lines is as critical as capillaries in a vascular system. This technical reference examines the dimensional specifications of socket weld and threaded fittings, providing engineers with essential data for system design and maintenance.
Socket Weld Fitting Dimensions
Socket weld fittings are widely used in industrial piping systems due to their high connection strength and superior sealing performance. The dimensional specifications directly impact connection reliability and safety.
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Nominal Pipe Size (inches)
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Outer Diameter A
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Socket Bore B (max/min)
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Fitting Bore C – 3000 (max/min)
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Fitting Bore C – 6000 (max/min)
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Fitting Bore C – 9000 (max/min)
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Wall Thickness D – 3000 (avg/min)
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Wall Thickness D – 6000 (avg/min)
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Wall Thickness D – 9000 (avg/min)
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Full Coupling L1
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Full Coupling L2
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Half Coupling L1
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Half Coupling L2
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1/8
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B+D
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11.2 / 10.8
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7.6 / 6.1
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4.8 / 3.2
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3.18 / 3.18
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3.96 / 3.43
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9.5
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6.5
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9.5
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16.0
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Key Dimension Parameters
Nominal Pipe Size (NPS):
The standard size designation for piping systems, not representing actual inner or outer diameter. Fittings must match the pipe's NPS.
Outer Diameter (A):
The external circumference diameter determining the fitting's overall size.
Socket Bore Diameter (B):
The internal diameter of the socket that determines pipe insertion depth and tightness. Maximum and minimum values represent allowable tolerance ranges.
Fitting Bore Diameter (C):
The internal flow passage diameter affecting fluid capacity. Varies by pressure rating (3000, 6000, 9000 psi).
Wall Thickness (D):
Material thickness directly affecting pressure rating and service life. Values shown include average and minimum thickness for each pressure class.
Threaded Fitting Dimensions
Threaded fittings offer installation convenience and disassembly capability, commonly used in low-pressure, non-critical applications.
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Nominal Pipe Size (inches)
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End-to-End A
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Min. Thread Length B
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Outer Diameter C
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1/8
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32
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6.7
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16
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Key Dimension Parameters
End-to-End Distance (A):
The overall length between fitting ends. Full couplings are twice as long as half couplings.
Minimum Thread Length (B):
The minimum engaged thread length ensuring connection reliability. Varies by pressure class.
Dimensional Tolerances
ASME B16.9 standard specifies dimensional tolerances for pipe fittings to ensure interchangeability and installation quality.
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NPS
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O.D. Tolerance
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I.D. Tolerance
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Wall Thickness Tolerance
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½ to 2½
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+0.06/-0.03 in
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±0.03 in
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≥87.5% nominal
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Key Tolerance Parameters
Outer Diameter Tolerance:
Allowable variation at beveled ends affecting weld quality.
Inner Diameter Tolerance:
Permissible variation at fitting ends impacting flow characteristics.
Wall Thickness Tolerance:
Acceptable material thickness variation affecting pressure capacity.
Selection and Application Considerations
When selecting pipe fittings, engineers should evaluate:
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Operating pressure and temperature requirements
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Fluid compatibility and corrosion resistance
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Connection method suitability (socket weld, threaded, etc.)
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Installation space constraints
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Compliance with relevant standards (ASME B16.9)
Proper understanding of socket weld and threaded fitting specifications is essential for designing reliable piping systems. This reference provides the fundamental dimensional data needed for technical decision-making.
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