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M11521-07 — RING,EXPANSION,HOSE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

M11521-07: RING,EXPANSION,HOSE.

The RING,EXPANSION,HOSE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, thickness: 0.050 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN, overall_length: 1.250 INCHES NOMINAL IN, outside_diameter: 2.500 INCHES NOMINAL IN, nondefinitive_spec/std_data: 1 FIGURE, specification/standard_data: 81349-MIL-R-11521 GOVERNMENT SPECIFICATION. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-243-9133, 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
M11521-07
NSN: 4730-00-243-9133
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY
thickness0.050 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
overall_length1.250 INCHES NOMINAL IN
outside_diameter2.500 INCHES NOMINAL IN
nondefinitive_spec/std_data1 FIGURE
specification/standard_data81349-MIL-R-11521 GOVERNMENT SPECIFICATION
NSN4730-00-243-9133
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: M11521-07 · 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
•
OUTSIDE DIAMETER: 2.500 INCHES NOMINAL IN
•
SPECIFICATION/STANDARD DATA: 81349-MIL-R-11521 GOVERNMENT SPECIFICATION
•
NONDEFINITIVE SPEC/STD DATA: 1 FIGURE
•
MATERIAL: COPPER ALLOY
•
THICKNESS: 0.050 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL LENGTH1.250 INCHES NOMINAL IN
OUTSIDE DIAMETER2.500 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81349-MIL-R-11521 GOVERNMENT SPECIFICATION
NONDEFINITIVE SPEC/STD DATA1 FIGURE
MATERIALCOPPER ALLOY
THICKNESS0.050 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 3
AA55535-07Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
A-A-55535Reference document
Same NSN cross-reference
Reference document — Identification reference
MIL-R-11521Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M11521-07?
M11521-07 is a RING,EXPANSION,HOSE.
What parts can replace M11521-07?
There are 3 known substitutes for M11521-07: AA55535-07, A-A-55535, MIL-R-11521. Substitute compatibility should be verified for your specific system.
What is the NSN for M11521-07?
M11521-07 is cataloged in the U.S. Government catalog under NSN 4730-00-243-9133. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.