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NB-3138 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

VALVE,FUEL PRESSURIZING AND DRAI. Key specifications include material: STEEL COMP 1035 AND STEEL COMP 1045, thickness: 0.438 INCHES NOMINAL IN, neck_height: 0.312 INCHES NOMINAL IN, neck_diameter: 1.125 INCHES NOMINAL IN, flange_diameter: 3.250 INCHES NOMINAL IN, style_designator: ROUND, ONE BOLT HOLE CIRCLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-198-1163, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
NB-3138
NSN: 4730-01-198-1163
FSC: 4730
CAGE: 82328 — DRESSER RAND CO TERRY CORP STEAM TURBINE MOTOR AND GENERATOR CO A JOINT VENTURE (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 AND STEEL COMP 1045
thickness0.438 INCHES NOMINAL IN
neck_height0.312 INCHES NOMINAL IN
neck_diameter1.125 INCHES NOMINAL IN
flange_diameter3.250 INCHES NOMINAL IN
style_designatorROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.562 INCHES NOMINAL IN
bolt_hole_quantity3
bolt_circle_diameter2.125 INCHES NOMINAL IN
flange_section_stylePLAIN FACE, LONG NECK
end_item_identificationGOVERNOR PILOT VALVE
face_seating_surface_conditionMACHINED
NSN4730-01-198-1163
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: NB-3138 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
BOLT HOLE QUANTITY: 3
•
FACE SEATING SURFACE CONDITION: MACHINED
•
NECK HEIGHT: 0.312 INCHES NOMINAL IN
•
NECK DIAMETER: 1.125 INCHES NOMINAL IN
•
BOLT CIRCLE DIAMETER: 2.125 INCHES NOMINAL IN
•
FLANGE DIAMETER: 3.250 INCHES NOMINAL IN
•
THICKNESS: 0.438 INCHES NOMINAL IN
•
BOLT HOLE DIAMETER: 0.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BOLT HOLE QUANTITY3
FACE SEATING SURFACE CONDITIONMACHINED
NECK HEIGHT0.312 INCHES NOMINAL IN
NECK DIAMETER1.125 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER2.125 INCHES NOMINAL IN
FLANGE DIAMETER3.250 INCHES NOMINAL IN
THICKNESS0.438 INCHES NOMINAL IN
BOLT HOLE DIAMETER0.562 INCHES NOMINAL IN
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
FLANGE SECTION STYLEPLAIN FACE, LONG NECK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
K-500-CH-1349Interchangeable
interchangeable cross-reference
interchangeable
MS14314-3XInterchangeable
interchangeable cross-reference
interchangeable
W6506BInterchangeable
interchangeable cross-reference
interchangeable
4730PL0773105Interchangeable
interchangeable cross-reference
interchangeable
2EH663Interchangeable
interchangeable cross-reference
interchangeable
300027Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NB-3138?
NB-3138 is a VALVE,FUEL PRESSURIZING AND DRAI.
What parts can replace NB-3138?
There are 20 known substitutes for NB-3138: K-500-CH-1349, MS14314-3X, W6506B and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NB-3138?
NB-3138 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-198-1163. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026