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AS1738 — 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 NUT ASSEMBLY,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY, overall_length: 0.570 INCHES MAXIMUM IN, outside_diameter: 3.793 INCHES MAXIMUM IN, special_features: FURNISHED WITH WASHER, style_designator: NUT ASSEMBLY, tube_outside_diameter_for_which_designed: 3.0 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4730-01-334-0804, 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
AS1738
NSN: 4730-01-334-0804
FSC: 4730
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
overall_length0.570 INCHES MAXIMUM IN
outside_diameter3.793 INCHES MAXIMUM IN
special_featuresFURNISHED WITH WASHER
style_designatorNUT ASSEMBLY
tube_outside_diameter_for_which_designed3.0 INCHES NOMINAL IN
NSN4730-01-334-0804
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS1738 · 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
•
SCREW THREAD SERIES DESIGNATOR: UN
•
SPECIFICATION/STANDARD DATA: 81343-AS1738 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
MATERIAL: ALUMINUM ALLOY
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE
•
STYLE DESIGNATOR: NUT ASSEMBLY
•
THREAD SIZE: 3/4-12
TECHNICAL CHARACTERISTICS
SCREW THREAD SERIES DESIGNATORUN
OVERALL LENGTH0.418 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81343-AS1738 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MATERIALALUMINUM ALLOY
NONDEFINITIVE SPEC/STD DATA1 TYPE
STYLE DESIGNATORNUT ASSEMBLY
SPECIAL FEATURESFURNISHED WITH WASHER
THREAD SIZE3/4-12
OUTSIDE DIAMETER1.079 INCHES NOMINAL IN
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
AS1738-1D12InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
TC039-12AInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
C925-3A12InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SAE-AS1730InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
AS1730InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
AS1732InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS1738?
AS1738 is a NUT ASSEMBLY,TUBE COUPLING.
What parts can replace AS1738?
There are 18 known substitutes for AS1738: AS1738-1D12, TC039-12A, C925-3A12 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS1738?
AS1738 is cataloged in the Federal Logistics Information System under NSN 4730-01-334-0804. 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: September 2026