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H303857 ✓ Verified by PartsTable
— · 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 RETAINER,COOLER UNI is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.000 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES THREADS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3020-00-999-0859, 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
H303857
NSN: 3020-00-999-0859
FSC: 3020
CAGE: 58163 — MEGGITT (NORTH HOLLYWOOD), INC. DBA MEGGITT CONTROL SYSTEMS DIV MEGGITT DEFENSE SYSTEMS, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
thread_class2A A
thread_length1.000 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES THREADS
fastener_length1.313 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentZINC AND CHROMATE OVERALL
width_between_flats0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
nominal_thread_diameter0.375 INCHES IN
NSN3020-00-999-0859
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RETAINER,COOLER UNI TITLE COMPONENT PN H303857 MFR RETAINER,COOLER UNI
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
572-2200-1416986ALTAPC27Interchangeable
interchangeable cross-reference
interchangeable
572-2200-1416982ALTCPC31Interchangeable
interchangeable cross-reference
interchangeable
572-2100-1417389REVAPC22Interchangeable
interchangeable cross-reference
interchangeable
10383837Interchangeable
interchangeable cross-reference
interchangeable
MS90728-63Interchangeable
interchangeable cross-reference
interchangeable
AES01C375A37AW9A91Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is H303857?
H303857 is a RETAINER,COOLER UNI.
What parts can replace H303857?
There are 7 known substitutes for H303857: 572-2200-1416986ALTAPC27, 572-2200-1416982ALTCPC31, 572-2100-1417389REVAPC22 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H303857?
H303857 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3020-00-999-0859. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026