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274509 ✓ 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

LENS BLANK,OPHTHALMIC,MULTIFOCAL. Key specifications include end_item_identification: 6540-01-604-9603 OPHTHALMIC LENS FABRICATION SYSTEM, part_name_assigned_by_controlling_agency: LENS MULTIFOCAL 75MM FT28 4 BASE 1.25 ADD LEFT MM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-250-7903, 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
274509
NSN: 4730-00-250-7903
FSC: 4730
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
special_featuresMULTIFOCAL LENS, 75MM FT28 4 BASE 1.25 ADD LEFT; FOR USE WITH END ITEM NSN 6540-01-604-9603 MULTIVISION FABRICATION SYSTEM MM
end_item_identification6540-01-604-9603 OPHTHALMIC LENS FABRICATION SYSTEM
part_name_assigned_by_controlling_agencyLENS MULTIFOCAL 75MM FT28 4 BASE 1.25 ADD LEFT MM
NSN4730-00-250-7903
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 274509 · 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
•
HEIGHT: 0.906 INCHES NOMINAL IN
•
ASSEMBLY CLEARANCE RADIUS: 0.469 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 28
•
SCREW THREAD SERIES DESIGNATOR: SAE-LT
•
ANGLE: 45.0 DEGREES
•
WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
HEIGHT0.906 INCHES NOMINAL IN
SPECIAL FEATURESSURFACE LOCATED BALL CHECK VALVE
ASSEMBLY CLEARANCE RADIUS0.469 INCHES NOMINAL IN
THREAD QUANTITY PER INCH28
SCREW THREAD SERIES DESIGNATORSAE-LT
ANGLE45.0 DEGREES
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
4301Interchangeable
interchangeable cross-reference
interchangeable
122-5277671 ITEM 33Interchangeable
interchangeable cross-reference
interchangeable
9412350Interchangeable
interchangeable cross-reference
interchangeable
110308Interchangeable
interchangeable cross-reference
interchangeable
013-2024-00-0-479Interchangeable
interchangeable cross-reference
interchangeable
149-002-0719Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 274509?
274509 is a LENS BLANK,OPHTHALMIC,MULTIFOCAL.
What parts can replace 274509?
There are 21 known substitutes for 274509: 4301, 122-5277671 ITEM 33, 9412350 and 18 more. Substitute compatibility should be verified for your specific system.
Is 274509 still available?
274509 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