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ASME B16.39 CLASS 300 NPS 1/2 — Technical Data Sheet

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— · 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

The UNION,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_type: GROUND-JOINT, connection_type: THREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: THREADED, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4730-00-189-2630, 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
ASME B16.39 CLASS 300 NPS 1/2
NSN: 4730-00-189-2630
FSC: 4730
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seat_typeGROUND-JOINT
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorTHREADED
surface_treatmentZINC OVERALL
operating_pressure300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.500 INCHES FIRST END IN
nominal_overall_length1.930 INCHES IN
media_for_which_designedSTEAM SINGLE RESPONSE
thread_series_designatorNPT ALL ENDS
nondefinitive_spec/std_dataXB TYPE
NSN4730-00-189-2630
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ASME B16.39 CLASS 300 NPS 1/2 · 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
•
SURFACE TREATMENT: ZINC OVERALL
•
NOMINAL THREAD SIZE: 0.500 INCHES FIRST END IN
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
•
MATERIAL: STEEL OVERALL
•
OPERATING PRESSURE: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
SPECIFICATION/STANDARD DATA: 81349-MIL-U-18250 GOVERNMENT SPECIFICATION
•
SEAT TYPE: GROUND-JOINT
TECHNICAL CHARACTERISTICS
SURFACE TREATMENTZINC OVERALL
NOMINAL THREAD SIZE0.500 INCHES FIRST END IN
THREAD SERIES DESIGNATORNPT ALL ENDS
MATERIALSTEEL OVERALL
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
SPECIFICATION/STANDARD DATA81349-MIL-U-18250 GOVERNMENT SPECIFICATION
SURFACE TREATMENTZINC OVERALL
SEAT TYPEGROUND-JOINT
NONDEFINITIVE SPEC/STD DATAXB TYPE
SPECIFICATION/STANDARD DATA81349-MIL-U-18250 GOVERNMENT SPECIFICATION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
MILU18250InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
519-3-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
B16.39InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
198EInterchangeableGOVERNMENT REGISTRY
IBM 428GB 15K RPM SAS Disk Drive 3.5 (IBM i)
interchangeable
MILU18250TYPEXAInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1631-400InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ASME B16.39 CLASS 300 NPS 1/2?
ASME B16.39 CLASS 300 NPS 1/2 is a UNION,PIPE.
What parts can replace ASME B16.39 CLASS 300 NPS 1/2?
There are 13 known substitutes for ASME B16.39 CLASS 300 NPS 1/2: MILU18250, 519-3-4, B16.39 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ASME B16.39 CLASS 300 NPS 1/2?
ASME B16.39 CLASS 300 NPS 1/2 is cataloged in the Federal Logistics Information System under NSN 4730-00-189-2630. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: September 2026