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Technical Data Sheet
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301745 — LENS BLANK,OPHTHALMIC,MULTIFOCAL

✓ Government record, cited
— · BALL BEARING
PRODUCT OVERVIEW

301745: LENS BLANK,OPHTHALMIC,MULTIFOCAL.

LENS BLANK,OPHTHALMIC,MULTIFOCAL. Key specifications include end_item_identification: 4939-016916188, part_name_assigned_by_controlling_agency: PLUG,MACHINE THREAD. This part is cataloged in the U.S.

Government catalog under NSN 3120-00-776-7355, 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
301745
NSN: 3120-00-776-7355
NIINs: 007767355, 014668327, 016150043, 016993137
FSC: 3120 — Bearings, Plain, Unmounted
CAGE: 02978 — RENK AMERICA LLC DIV RENK AMERICA (USA)
SPECIFICATIONS
special_featuresMULTIFOCAL LENS 75 MM FT28 8 BASE 1.50 ADD LEFT; FOR USE WITH END ITEM NSN 6540-01-604-9603 MULTIVISION FABRICATION SYSTEM MM
end_item_identification4939-016916188
part_name_assigned_by_controlling_agencyPLUG,MACHINE THREAD
NSN3120-00-776-7355
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 301745 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE FINISH: 125.0 MICROINCHES RIGHT END SURFACE OF BODY
•
CORNER SHAPE: CHAMFERED INSIDE LEFT CORNER
•
FLANGE OUTSIDE DIAMETER: 2.2400 INCHES MINIMUM AND 2.2600 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH125.0 MICROINCHES RIGHT END SURFACE OF BODY
CORNER SHAPECHAMFERED INSIDE LEFT CORNER
CORNER SHAPESQUARE INSIDE RIGHT CORNER
CORNER SHAPERELIEF GROOVE LEFT FLANGE BODY CORNER
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPECHAMFERED OUTSIDE LEFT CORNER
CORNER SHAPECHAMFERED OUTSIDE RIGHT CORNER
FLANGE OUTSIDE DIAMETER2.2400 INCHES MINIMUM AND 2.2600 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER1.9405 INCHES MINIMUM AND 1.9415 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 301745?
301745 is a LENS BLANK,OPHTHALMIC,MULTIFOCAL.
What is the NSN for 301745?
301745 is cataloged in the U.S. Government catalog under NSN 3120-00-776-7355. 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.