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4209765 ✓ 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 NUT,UNION is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OVERALL, nut_style: ROUND, nut_height: 1.250 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN, nut_diameter: 4.734 INCHES MINIMUM AND 4.766 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNJS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-135-2546, 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
4209765
NSN: 4730-01-135-2546
FSC: 4730
CAGE: 80212 — BAE SYSTEMS LAND & ARMAMENTS L.P. (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 OVERALL
nut_styleROUND
nut_height1.250 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN
nut_diameter4.734 INCHES MINIMUM AND 4.766 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNJS
shoulder_width0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
nominal_thread_size4.375 INCHES IN
shoulder_step_width0.438 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
shoulder_seat_diameter3.734 INCHES MINIMUM AND 3.766 INCHES MAXIMUM IN
NSN4730-01-135-2546
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4209765 · 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: CADMIUM AND CHROMATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6415 UNS G43400 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SUPPLEMENTARY FEATURES: END ITEM NSN 4920-01-142-0108 HYDRAULIC ACCUMULATOR; U/O MODEL AIFV; RING,RETAINING,END CAP,HYD POWER SUPPLY FUNCTION
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
THREAD QUANTITY PER INCH: 16
•
SHOULDER SEAT DIAMETER: 3.734 INCHES MINIMUM AND 3.766 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 4.375 INCHES IN
•
THREAD SERIES: UNJS
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6415 UNS G43400 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SUPPLEMENTARY FEATURESEND ITEM NSN 4920-01-142-0108 HYDRAULIC ACCUMULATOR; U/O MODEL AIFV; RING,RETAINING,END CAP,HYD POWER SUPPLY FUNCTION
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD QUANTITY PER INCH16
SHOULDER SEAT DIAMETER3.734 INCHES MINIMUM AND 3.766 INCHES MAXIMUM IN
NOMINAL THREAD SIZE4.375 INCHES IN
THREAD SERIESUNJS
SHOULDER STEP WIDTH0.438 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
SMALLEST INSIDE DIAMETER3.297 INCHES MINIMUM AND 3.328 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
37014Interchangeable
interchangeable cross-reference
interchangeable
3415-1116-1436Interchangeable
interchangeable cross-reference
interchangeable
37114Interchangeable
interchangeable cross-reference
interchangeable
FIG NO 37Interchangeable
interchangeable cross-reference
interchangeable
37*014Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4209765?
4209765 is a NUT,UNION.
What parts can replace 4209765?
There are 5 known substitutes for 4209765: 37014, 3415-1116-1436, 37114 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4209765?
4209765 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-135-2546. 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.
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Last verified: July 2026