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Technical Data Sheet
PartsTable / COMPONENT / 21311-54
21311-54 ✓ 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

The RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include length: 1.360 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING, design_type: TUBULAR, HEX SHAPE, thread_length: 0.550 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF) LOCATION NOT OTHERWISE SPECIFIED, orifice_diameter: 0.187 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-415-3260, 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
21311-54
NSN: 4730-01-415-3260
FSC: 4730
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)
SPECIFICATIONS
length1.360 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING
design_typeTUBULAR, HEX SHAPE
thread_length0.550 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF) LOCATION NOT OTHERWISE SPECIFIED
orifice_diameter0.187 INCHES NOMINAL IN
outside_diameter0.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
thread_provisionTHREADED LOCATION NOT OTHERWISE SPECIFIED
thread_size_designator7/16-20 LOCATION NOT OTHERWISE SPECIFIED
end_item_identificationSEAWOLF CLASS SSN
NSN4730-01-415-3260
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 21311-54 · 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
•
THREAD LENGTH: 0.550 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
LENGTH: 1.360 INCHES NOMINAL IN
•
ORIFICE DIAMETER: 0.187 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
•
THREAD SIZE DESIGNATOR: 7/16-20 LOCATION NOT OTHERWISE SPECIFIED
•
THREAD PROVISION: THREADED LOCATION NOT OTHERWISE SPECIFIED
•
OUTSIDE DIAMETER: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.550 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
LENGTH1.360 INCHES NOMINAL IN
ORIFICE DIAMETER0.187 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
THREAD SIZE DESIGNATOR7/16-20 LOCATION NOT OTHERWISE SPECIFIED
THREAD PROVISIONTHREADED LOCATION NOT OTHERWISE SPECIFIED
OUTSIDE DIAMETER0.250 INCHES NOMINAL IN
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
DESIGN TYPETUBULAR, HEX SHAPE
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF) LOCATION NOT OTHERWISE SPECIFIED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
48-40Interchangeable
interchangeable cross-reference
interchangeable
556012-038Interchangeable
interchangeable cross-reference
interchangeable
21311Interchangeable
interchangeable cross-reference
interchangeable
S1640-61312Interchangeable
interchangeable cross-reference
interchangeable
NH1002652-10Interchangeable
interchangeable cross-reference
interchangeable
5216APInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21311-54?
21311-54 is a RESTRICTOR,FLUID FLOW.
What parts can replace 21311-54?
There are 12 known substitutes for 21311-54: 48-40, 556012-038, 21311 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21311-54?
21311-54 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-415-3260. 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