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SD5439 ✓ 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 RING-SPLINED,ACTUATOR is a the manufacturer industrial component. Key specifications include material: STEEL, thickness: 0.156 INCHES NOMINAL IN, overall_length: 0.469 INCHES NOMINAL IN, surface_treatment: ZINC, width_across_flats: 1.000 INCHES NOMINAL IN, male_end_thread_size: 13/16 IN.20 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 4730-00-350-6991, 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
SD5439
NSN: 4730-00-350-6991
FSC: 4730
CAGE: 35311 — AMERICAN STANDARD INC WESTINGHOUSE AIR BRAKE CO DIV (USA)
SPECIFICATIONS
materialSTEEL
thickness0.156 INCHES NOMINAL IN
overall_length0.469 INCHES NOMINAL IN
surface_treatmentZINC
width_across_flats1.000 INCHES NOMINAL IN
male_end_thread_size13/16 IN.20 IN
male_end_thread_class2A A
female_end_thread_size1/4 IN.-18 IN
male_end_thread_length0.312 INCHES NOMINAL IN
female_end_thread_length0.375 INCHES NOMINAL IN
wrenching_facility_shapeHEXAGON
male_end_thread_directionRIGHT-HAND
NSN4730-00-350-6991
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: SD5439 · 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: STEEL
•
SURFACE TREATMENT: ZINC
•
FEMALE END THREAD SIZE: 1/4 IN.-18 IN
•
MALE END THREAD SIZE: 13/16 IN.20 IN
•
MALE END THREAD CLASS: 2A A
•
MALE END THREAD LENGTH: 0.312 INCHES NOMINAL IN
•
FEMALE END THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH0.469 INCHES NOMINAL IN
MATERIALSTEEL
SURFACE TREATMENTZINC
FEMALE END THREAD SIZE1/4 IN.-18 IN
MALE END THREAD SIZE13/16 IN.20 IN
MALE END THREAD CLASS2A A
MALE END THREAD LENGTH0.312 INCHES NOMINAL IN
FEMALE END THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
FEMALE END THREAD LENGTH0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
A544FS50174SInterchangeable
interchangeable cross-reference
interchangeable
8916-5Interchangeable
interchangeable cross-reference
interchangeable
281479-61Interchangeable
interchangeable cross-reference
interchangeable
532512-2Interchangeable
interchangeable cross-reference
interchangeable
AC544Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SD5439?
SD5439 is a RING-SPLINED,ACTUATOR.
What parts can replace SD5439?
There are 5 known substitutes for SD5439: A544FS50174S, 8916-5, 281479-61 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SD5439?
SD5439 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-350-6991. 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