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11290856-1 — EXPANSION JOINT,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

11290856-1: EXPANSION JOINT,PIPE.

The EXPANSION JOINT,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 321 FLANGE, joint_type: DOUBLE, design_type: DIAPHRAGM, overall_length: 7.500 INCHES MINIMUM AND 7.880 INCHES MAXIMUM IN, surface_treatment: PASSIVATE FLANGE, bolt_hole_diameter: 0.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-151-6838, 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
11290856-1
NSN: 4730-00-151-6838
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 17773 — BALLISTIC MISSILE DEFENSE SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL COMP 321 FLANGE
joint_typeDOUBLE
design_typeDIAPHRAGM
overall_length7.500 INCHES MINIMUM AND 7.880 INCHES MAXIMUM IN
surface_treatmentPASSIVATE FLANGE
bolt_hole_diameter0.750 INCHES NOMINAL IN
bolt_hole_quantity4
bolt_circle_diameter6.000 INCHES NOMINAL IN
traverse_maximum_length0.160 INCHES IN
nominal_pipe_size_designation3.000 INCHES IN
NSN4730-00-151-6838
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 11290856-1 · 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
•
NOMINAL PIPE SIZE DESIGNATION: 3.000 INCHES IN
•
DESIGN TYPE: DIAPHRAGM
•
TRAVERSE MAXIMUM LENGTH: 0.160 INCHES IN
•
BOLT HOLE DIAMETER: 0.750 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 4
•
BOLT CIRCLE DIAMETER: 6.000 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE FLANGE
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE DESIGNATION3.000 INCHES IN
DESIGN TYPEDIAPHRAGM
TRAVERSE MAXIMUM LENGTH0.160 INCHES IN
BOLT HOLE DIAMETER0.750 INCHES NOMINAL IN
OVERALL LENGTH7.500 INCHES MINIMUM AND 7.880 INCHES MAXIMUM IN
BOLT HOLE QUANTITY4
BOLT CIRCLE DIAMETER6.000 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE FLANGE
MATERIALSTEEL COMP 321 FLANGE
JOINT TYPEDOUBLE
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 2
3ES44Reference document
Same NSN cross-reference
Reference document — Secondary reference
FS2085-3IN321CRESame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 11290856-1?
11290856-1 is a EXPANSION JOINT,PIPE.
What parts can replace 11290856-1?
There are 2 known substitutes for 11290856-1: 3ES44, FS2085-3IN321CRE. Substitute compatibility should be verified for your specific system.
What is the NSN for 11290856-1?
11290856-1 is cataloged in the U.S. Government catalog under NSN 4730-00-151-6838. 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.