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1220D1121 — ADAPTER,STRAIGHT,FLANGE TO FLANG

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1220D1121: ADAPTER,STRAIGHT,FLANGE TO FLANG.

ADAPTER,STRAIGHT,FLANGE TO FLANG. Key specifications include material: COPPER ALLOY OVERALL, flange_shape: ROUND WITH HOLES ALL ENDS, connection_type: FLANGE ALL ENDS, nominal_thickness: 0.440 INCHES ALL ENDS IN, bolt_hole_quantity: 4 ALL ENDS, flange_face_design: PLAIN ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-421-2598, 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
1220D1121
NSN: 4730-01-421-2598
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 82005 — ALLARD NAZARIAN GROUP, INC. DBA GRANITE STATE MANUFACTURING (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
flange_shapeROUND WITH HOLES ALL ENDS
connection_typeFLANGE ALL ENDS
nominal_thickness0.440 INCHES ALL ENDS IN
bolt_hole_quantity4 ALL ENDS
flange_face_designPLAIN ALL ENDS
nominal_overall_length5.000 INCHES IN
end_item_identificationLOS ANGELES CLASS SSN(688)
nominal_outside_diameter5.000 INCHES ALL ENDS IN
bolt_hole_nominal_diameter0.531 INCHES ALL ENDS IN
bolt_circle_nominal_diameter4.000 INCHES ALL ENDS IN
material_document_and_classificationMIL-C-20159 TYPE II(90-10) MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-01-421-2598
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1220D1121 · 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
•
FLANGE SHAPE: ROUND WITH HOLES ALL ENDS
•
FLANGE FACE DESIGN: PLAIN ALL ENDS
•
BOLT CIRCLE NOMINAL DIAMETER: 4.000 INCHES ALL ENDS IN
•
NOMINAL OVERALL LENGTH: 5.000 INCHES IN
•
CONNECTION TYPE: FLANGE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-C-20159 TYPE II(90-10) MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
BOLT HOLE NOMINAL DIAMETER: 0.531 INCHES ALL ENDS IN
•
NOMINAL OUTSIDE DIAMETER: 5.000 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
FLANGE SHAPEROUND WITH HOLES ALL ENDS
FLANGE FACE DESIGNPLAIN ALL ENDS
BOLT CIRCLE NOMINAL DIAMETER4.000 INCHES ALL ENDS IN
NOMINAL OVERALL LENGTH5.000 INCHES IN
CONNECTION TYPEFLANGE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-C-20159 TYPE II(90-10) MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
BOLT HOLE NOMINAL DIAMETER0.531 INCHES ALL ENDS IN
NOMINAL OUTSIDE DIAMETER5.000 INCHES ALL ENDS IN
BOLT HOLE QUANTITY4 ALL ENDS
END ITEM IDENTIFICATIONLOS ANGELES CLASS SSN(688)
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

No substitute or cross-reference records for this part.

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 1220D1121?
1220D1121 is a ADAPTER,STRAIGHT,FLANGE TO FLANG.
What is the NSN for 1220D1121?
1220D1121 is cataloged in the U.S. Government catalog under NSN 4730-01-421-2598. 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.