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Technical Data Sheet
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579.75 FOCAL — Technical Data Sheet

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— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The LENS,HELMET,WELDER'S is a the manufacturer industrial component. Key specifications include material: PLASTIC, overall_width: 2.000 INCHES NOMINAL IN, overall_length: 4.000 INCHES NOMINAL IN, special_features: 1.750 FOCAL POWER FOR AGE 50 TO 52; MAGNIFYING LENS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4240-01-220-2940, 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
579.75 FOCAL
NSN: 4240-01-220-2940
FSC: 4240
CAGE: 02622 — AMERICAN OPTICAL CO (USA)
SPECIFICATIONS
materialPLASTIC
overall_width2.000 INCHES NOMINAL IN
overall_length4.000 INCHES NOMINAL IN
special_features1.750 FOCAL POWER FOR AGE 50 TO 52; MAGNIFYING LENS
NSN4240-01-220-2940
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available LENS,HELMET,WELDER'S TITLE COMPONENT PN 579.75 FOCAL MFR LENS,HELMET,WELDER'S
KEY FEATURES
•
MATERIAL: PLASTIC
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPLASTIC
SPECIAL FEATURES1.750 FOCAL POWER FOR AGE 50 TO 52; MAGNIFYING LENS
OVERALL WIDTH2.000 INCHES NOMINAL IN
OVERALL LENGTH4.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
QQ-A-200/3Interchangeable
interchangeable cross-reference
interchangeable
FS10101-0606Interchangeable
interchangeable cross-reference
interchangeable
M175Interchangeable
interchangeable cross-reference
interchangeable
3591-114Interchangeable
interchangeable cross-reference
interchangeable
13934Interchangeable
interchangeable cross-reference
interchangeable
5308Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 579.75 FOCAL?
579.75 FOCAL is a LENS,HELMET,WELDER'S.
What parts can replace 579.75 FOCAL?
There are 23 known substitutes for 579.75 FOCAL: QQ-A-200/3, FS10101-0606, M175 and 20 more. Substitute compatibility should be verified for your specific system.
Is 579.75 FOCAL still available?
579.75 FOCAL is currently cancelled.
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Last verified: September 2026