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Technical Data Sheet
PartsTable / COMPONENT / A51K9035-1
A51K9035-1 ✓ 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 TEE,BOSS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 6061 OVERALL, leg_length: 0.863 INCHES MINIMUM AND 0.873 INCHES MAXIMUM THIRD END IN, thread_class: 2B ALL ENDS, connection_type: THREADED INTERNAL BOSS ALL ENDS, connection_style: GASKET SEAL (BOSS) ALL ENDS, special_features: MOUNTING HOLES IN 2 CORNORS 0.218 IN.MIN DIA,0.226 IN.MAX DIA,LOCKWIRE HOLES 0.057 IN.DIA IN EACH CORNER IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-201-9591, 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
A51K9035-1
NSN: 4730-00-201-9591
FSC: 4730
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
leg_length0.863 INCHES MINIMUM AND 0.873 INCHES MAXIMUM THIRD END IN
thread_class2B ALL ENDS
connection_typeTHREADED INTERNAL BOSS ALL ENDS
connection_styleGASKET SEAL (BOSS) ALL ENDS
special_featuresMOUNTING HOLES IN 2 CORNORS 0.218 IN.MIN DIA,0.226 IN.MAX DIA,LOCKWIRE HOLES 0.057 IN.DIA IN EACH CORNER IN
surface_treatmentANODIZE OVERALL
nominal_thread_size0.250 INCHES ALL ENDS IN
media_for_which_designedFLUID SINGLE RESPONSE
thread_series_designatorUNF ALL ENDS
material_document_and_classificationQQ-A-225/8,T651 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN4730-00-201-9591
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A51K9035-1 · 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 DOCUMENT AND CLASSIFICATION: QQ-A-225/8,T651 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CONNECTION TYPE: THREADED INTERNAL BOSS ALL ENDS
•
LEG LENGTH: 0.683 INCHES NOMINAL SECOND END IN
•
MATERIAL: ALUMINUM ALLOY 6061 OVERALL
•
THREAD CLASS: 2B ALL ENDS
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: ANODIZE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/8,T651 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CONNECTION TYPETHREADED INTERNAL BOSS ALL ENDS
LEG LENGTH0.683 INCHES NOMINAL SECOND END IN
MATERIALALUMINUM ALLOY 6061 OVERALL
THREAD CLASS2B ALL ENDS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE 2,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALALUMINUM ALLOY 6061 OVERALL
SURFACE TREATMENTANODIZE OVERALL
THREAD SERIES DESIGNATORUNF ALL ENDS
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
21738REVLInterchangeable
interchangeable cross-reference
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21738Interchangeable
interchangeable cross-reference
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8444L3NInterchangeable
interchangeable cross-reference
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203974-1Interchangeable
interchangeable cross-reference
interchangeable
134SCEC125-15Interchangeable
interchangeable cross-reference
interchangeable
15494N REVBInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A51K9035-1?
A51K9035-1 is a TEE,BOSS.
What parts can replace A51K9035-1?
There are 15 known substitutes for A51K9035-1: 21738REVL, 21738, 8444L3N and 12 more. Substitute compatibility should be verified for your specific system.
Is A51K9035-1 still available?
A51K9035-1 is currently cancelled.
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Last verified: July 2026