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3R2603 — ADAPTER,STRAIGHT,FLANGE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

3R2603: ADAPTER,STRAIGHT,FLANGE TO TUBE.

ADAPTER,STRAIGHT,FLANGE TO TUBE. Key specifications include material: STEEL OVERALL, flange_shape: RECTANGULAR WITH HOLES SECOND ENDUNABLE TO DECODE, thread_class: 2B FIRST ENDUNABLE TO DECODE, nominal_width: 1.754 INCHES SECOND ENDUNABLE TO DECODE IN, nominal_length: 2.740 INCHES SECOND ENDUNABLE TO DECODE IN, connection_type: THREADED INTERNAL TUBE FIRST ENDUNABLE TO DECODE. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-962-3373, 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
3R2603
NSN: 4730-00-962-3373
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flange_shapeRECTANGULAR WITH HOLES SECOND ENDUNABLE TO DECODE
thread_class2B FIRST ENDUNABLE TO DECODE
nominal_width1.754 INCHES SECOND ENDUNABLE TO DECODE IN
nominal_length2.740 INCHES SECOND ENDUNABLE TO DECODE IN
connection_typeTHREADED INTERNAL TUBE FIRST ENDUNABLE TO DECODE
connection_styleSWIVEL NUT, GASKET SEAL (TUBE) FIRST ENDUNABLE TO DECODE
nominal_thickness0.983 INCHES SECOND END IN
bolt_hole_quantity4 SECOND ENDUNABLE TO DECODE
flange_face_designPLAIN SECOND END
nominal_thread_size0.875 INCHES FIRST END IN
nominal_overall_length0.983 INCHES IN
NSN4730-00-962-3373
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3R2603 · 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: RECTANGULAR WITH HOLES SECOND ENDUNABLE TO DECODE
•
FLANGE FACE DESIGN: UNABLE TO DECODE
•
CONNECTION STYLE: SWIVEL NUT, GASKET SEAL (TUBE) FIRST ENDUNABLE TO DECODE
•
NOMINAL LENGTH: 2.740 INCHES SECOND ENDUNABLE TO DECODE IN
•
NOMINAL OVERALL LENGTH: 0.983 INCHES IN
•
CONNECTION TYPE: FLANGE SECOND ENDUNABLE TO DECODE
TECHNICAL CHARACTERISTICS
FLANGE SHAPERECTANGULAR WITH HOLES SECOND ENDUNABLE TO DECODE
FLANGE FACE DESIGNUNABLE TO DECODE
FLANGE FACE DESIGNPLAIN SECOND END
CONNECTION STYLESWIVEL NUT, GASKET SEAL (TUBE) FIRST ENDUNABLE TO DECODE
NOMINAL LENGTH2.740 INCHES SECOND ENDUNABLE TO DECODE IN
NOMINAL OVERALL LENGTH0.983 INCHES IN
CONNECTION TYPEFLANGE SECOND ENDUNABLE TO DECODE
CONNECTION TYPETHREADED INTERNAL TUBE FIRST ENDUNABLE TO DECODE
BOLT HOLE NOMINAL DIAMETER0.410 INCHES SECOND END IN
BOLT HOLE NOMINAL DIAMETERUNABLE TO DECODE
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 3R2603?
3R2603 is a ADAPTER,STRAIGHT,FLANGE TO TUBE.
What is the NSN for 3R2603?
3R2603 is cataloged in the U.S. Government catalog under NSN 4730-00-962-3373. 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.