PartsTable
Technical Data Sheet
MK46 ✓ 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

COUPLING ASSEMBLY,QUICK DISCONNE. Key specifications include material: ALUMINUM ALLOY OVERALL, leg_length: 0.375 INCHES NOMINAL IN, seat_angle: 12.0 DEGREES, thread_class: 3A FIRST FLUID END CONNECTION A, overall_length: 2.381 INCHES NOMINAL IN, connection_type: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-986-7531, 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
MK46
NSN: 4730-00-986-7531
FSC: 4730
CAGE: 79326 — TRANSDIGM INC DIV ADELWIGGINS GROUP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
leg_length0.375 INCHES NOMINAL IN
seat_angle12.0 DEGREES
thread_class3A FIRST FLUID END CONNECTION A
overall_length2.381 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleFLARED FIRST FLUID END CONNECTION
style_designatorCOUPLING ASSEMBLY
features_providedSAFETY LOCKING FEATURE AND SELF-SEALING
surface_treatmentANODIZE OVERALL
operating_pressure750.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.312 INCHES FIRST FLUID END CONNECTION IN
NSN4730-00-986-7531
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MK46 · 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
NOMINAL THREAD SIZE: 0.312 INCHES FIRST FLUID END CONNECTION IN
SEAT ANGLE: 12.0 DEGREES
SURFACE TREATMENT: ANODIZE OVERALL
LEG LENGTH: 0.375 INCHES NOMINAL IN
FEATURES PROVIDED: SAFETY LOCKING FEATURE AND SELF-SEALING
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.125 INCHES ALL ENDS IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALALUMINUM ALLOY OVERALL
NOMINAL THREAD SIZE0.312 INCHES FIRST FLUID END CONNECTION IN
SEAT ANGLE12.0 DEGREES
SURFACE TREATMENTANODIZE OVERALL
LEG LENGTH0.375 INCHES NOMINAL IN
FEATURES PROVIDEDSAFETY LOCKING FEATURE AND SELF-SEALING
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.125 INCHES ALL ENDS IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) FIRST FLUID END CONNECTION
OVERALL LENGTH2.381 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
L921-5Interchangeable
interchangeable cross-reference
interchangeable
1421-5Interchangeable
interchangeable cross-reference
interchangeable
921-5Interchangeable
interchangeable cross-reference
interchangeable
5950PL0834816Interchangeable
interchangeable cross-reference
interchangeable
240-2710-150Interchangeable
interchangeable cross-reference
interchangeable
19370-15Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MK46?
MK46 is a COUPLING ASSEMBLY,QUICK DISCONNE.
What parts can replace MK46?
There are 21 known substitutes for MK46: L921-5, 1421-5, 921-5 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MK46?
MK46 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-986-7531. This indicates validated use in U.S. government and defense supply chains.
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