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Technical Data Sheet
21181-1 ✓ 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 TRANSISTOR is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, seat_angle: 45.0 DEGREES SECOND END, reducer_type: CONCENTRIC, thread_class: 3A SECOND END A, connection_style: SWIVEL NUT INVERTED FLARE (TUBE) FIRST END, features_provided: HERMETICALLY SEALED CASE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-032-7954, 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
21181-1
NSN: 4730-00-032-7954
FSC: 4730
CAGE: 81982 — HYDRO-AIRE AEROSPACE CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
seat_angle45.0 DEGREES SECOND END
reducer_typeCONCENTRIC
thread_class3A SECOND END A
connection_styleSWIVEL NUT INVERTED FLARE (TUBE) FIRST END
features_providedHERMETICALLY SEALED CASE
surface_treatmentANODIZE OVERALL
nominal_thread_size0.562 INCHES SECOND END IN
internal_configurationJUNCTION CONTACT
nominal_overall_length1.187 INCHES IN
semiconductor_materialGERMANIUM
thread_series_designatorUNF SECOND END
NSN4730-00-032-7954
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 21181-1 · 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
MATERIAL: ALUMINUM ALLOY OVERALL
THREAD SERIES DESIGNATOR: UNF SECOND END
CONNECTION STYLE: INVERTED FLARE (TUBE) SECOND END
THREAD CLASS: 3A SECOND END A
REDUCER TYPE: CONCENTRIC
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALALUMINUM ALLOY OVERALL
THREAD SERIES DESIGNATORUNF SECOND END
THREAD SERIES DESIGNATORUNF FIRST END
CONNECTION STYLEINVERTED FLARE (TUBE) SECOND END
THREAD CLASS3A SECOND END A
CONNECTION STYLESWIVEL NUT INVERTED FLARE (TUBE) FIRST END
REDUCER TYPECONCENTRIC
THREAD CLASS3B FIRST END
NOMINAL THREAD SIZE0.438 INCHES FIRST END IN
REDUCED PASSAGE NOMINAL INSIDE DIAMETER0.094 INCHES SECOND END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
21181-1Interchangeable
interchangeable cross-reference
interchangeable
2N525Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21181-1?
21181-1 is a TRANSISTOR.
What parts can replace 21181-1?
There are 2 known substitutes for 21181-1: 21181-1, 2N525. Substitute compatibility should be verified for your specific system.
What is the NSN for 21181-1?
21181-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-032-7954. This indicates validated use in U.S. government and defense supply chains.
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