PartsTable
Technical Data Sheet
491 ✓ Verified by PartsTable
· MRO · MRO_GENERAL
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

1.42/1.44MB 3.5in high-density disks (Unformatted) (10/BOX)NO LONGER SUPPLIED. Key specifications include color: BLACK BACKGROUND, width: 48.0 INCHES NOMINAL IN, cloth_weight: 190.0 POUNDS PER SQUARE YARD MINIMUM AND 200.0 POUNDS PER SQUARE YARD MAXIMUM LBS, fiber_material: POLYESTER CLOTH WARP, special_features: REFERENCE MEGGITT MANUAL AP472, unit_of_issue_weight: 4.50 POUNDS LBS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-494-2937, 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
MRO MRO_GENERAL 491
NSN: 6625-00-494-2937
FSC: 6625
CAGE: K0F21 — ALRAD INSTRUMENTS LIMITED (GBR)
SPECIFICATIONS
colorBLACK BACKGROUND
width48.0 INCHES NOMINAL IN
cloth_weight190.0 POUNDS PER SQUARE YARD MINIMUM AND 200.0 POUNDS PER SQUARE YARD MAXIMUM LBS
fiber_materialPOLYESTER CLOTH WARP
special_featuresREFERENCE MEGGITT MANUAL AP472
unit_of_issue_weight4.50 POUNDS LBS
NSN6625-00-494-2937
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR CAP: 1.44MB 1.42/1.44MB 3.5in high-density disks (Unformatted) (10/... TITLE COMPONENT PN 491 MFR 1.42/1.44MB 3.5in high
KEY FEATURES
1.44MB Capacity
REFERENCE DATA AND LITERATURE: T.O. 33A1-5-288-1
UNIT TYPE: STANDARD
FURNISHED ITEMS AND QUANTITY: COAX CABLE 2; PROTECTIVE COVER 1; VIEWING HOOD 1; OPERATORS MANUAL 1; SERVICE MANUAL 1; ADAPTER 1; FUSE 1; CRT LIGHT FILTERS 3
MOUNTING METHOD: CASE MOUNTED PORTABLE
CATHODE RAY TUBE DISPLAYED INFORMATION: REFERENCE LEVEL; FREQUENCY; VERTICAL DISPLAY; FREQUENCY SPAN; FREQUENCY RANGE; RESOLUTION BANDWIDTH; RF ATTENUATION
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL WIDTH12.870 INCHES NOMINAL IN
OVERALL LENGTH19.650 INCHES NOMINAL IN
OVERALL HEIGHT6.900 INCHES NOMINAL IN
REFERENCE DATA AND LITERATURET.O. 33A1-5-288-1
UNIT TYPESTANDARD
FURNISHED ITEMS AND QUANTITYCOAX CABLE 2; PROTECTIVE COVER 1; VIEWING HOOD 1; OPERATORS MANUAL 1; SERVICE MANUAL 1; ADAPTER 1; FUSE 1; CRT LIGHT FILTERS 3
MOUNTING METHODCASE MOUNTED PORTABLE
CATHODE RAY TUBE DISPLAYED INFORMATIONREFERENCE LEVEL; FREQUENCY; VERTICAL DISPLAY; FREQUENCY SPAN; FREQUENCY RANGE; RESOLUTION BANDWIDTH; RF ATTENUATION
OVERALL WIDTH12.870 INCHES NOMINAL IN
OVERALL LENGTH19.650 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
MF-2HD135TPUpgraded Successor
successor cross-reference
successor
91776815Upgraded Successor
successor cross-reference
successor
491Interchangeable
interchangeable cross-reference
interchangeable
11455404Interchangeable
interchangeable cross-reference
interchangeable
A20790AInterchangeable
Same NIIN cross-reference
interchangeable
U525-02Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 491?
491 is a 1.42/1.44MB 3.5in high-density disks (Unformatted) (10/BOX)NO LONGER SUPPLIED. It is classified as a MRO (MRO_GENERAL).
What parts can replace 491?
There are 7 known substitutes for 491: MF-2HD135TP, 91776815, 491 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 491?
491 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-00-494-2937. This indicates validated use in U.S. government and defense supply chains.
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