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Technical Data Sheet
PartsTable / COMPONENT / 2640-068
2640-068 ✓ 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

The COUPLING,SHAFT,FLEXIBLE is a the manufacturer industrial component. Key specifications include bore_shape: STRAIGHT BOTH ENDS, overall_length: 3.688 INCHES NOMINAL IN, outside_diameter: 4.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-893-3768, 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
2640-068
NSN: 4730-00-893-3768
FSC: 4730
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
bore_shapeSTRAIGHT BOTH ENDS
overall_length3.688 INCHES NOMINAL IN
outside_diameter4.500 INCHES NOMINAL IN
NSN4730-00-893-3768
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2640-068 · 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
•
BOLT HOLE DIAMETER: 0.687 INCHES NOMINAL IN
•
THICKNESS: 1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
SURFACE TREATMENT: OXIDE
•
FACE SEATING SURFACE CONDITION: UNFINISHED
•
BOLT CIRCLE DIAMETER: 7.187 INCHES NOMINAL IN
•
FLANGE DIAMETER: 8.688 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BOLT HOLE DIAMETER0.687 INCHES NOMINAL IN
THICKNESS1.000 INCHES NOMINAL IN
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
SURFACE TREATMENTOXIDE
FACE SEATING SURFACE CONDITIONUNFINISHED
SPECIAL FEATURESINLUDES TWO FLANGES;CENTER HOLE 9/16-18 UNF 2BTHD;ONE PLUG,HEX HEAD 3/8 IN.TUBE SIZE;AND ONE O-RING IN
BOLT CIRCLE DIAMETER7.187 INCHES NOMINAL IN
FLANGE DIAMETER8.688 INCHES NOMINAL IN
MATERIALSTEEL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-16113 TYPE 1 MIL SPEC SINGLE MATERIAL RESPONSE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
SS845-1889817Interchangeable
interchangeable cross-reference
interchangeable
15-97-0933Interchangeable
interchangeable cross-reference
interchangeable
15-97-0972Interchangeable
interchangeable cross-reference
interchangeable
15-97-0973Interchangeable
interchangeable cross-reference
interchangeable
2640-068REVSPC1T012Interchangeable
interchangeable cross-reference
interchangeable
15-97-0934Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2640-068?
2640-068 is a COUPLING,SHAFT,FLEXIBLE.
What parts can replace 2640-068?
There are 18 known substitutes for 2640-068: SS845-1889817, 15-97-0933, 15-97-0972 and 15 more. Substitute compatibility should be verified for your specific system.
Is 2640-068 still available?
2640-068 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026