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PartsTable / COMPONENT / 21-19677B MK B
21-19677B MK B ✓ 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 HEADER ASSEMBLY,HYD is a the manufacturer industrial component. Key specifications include criticality_code_justification: ZZZY, reference_number_differentiating_characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3655-01-031-8621, 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
21-19677B MK B
NSN: 3655-01-031-8621
FSC: 3655
CAGE: 81412 — TREADWELL CORPORATION (DELAWARE) DBA TREADWELL CORP (USA)
SPECIFICATIONS
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
NSN3655-01-031-8621
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available HEADER ASSEMBLY,HYD TITLE COMPONENT PN 21-19677B MK B MFR HEADER ASSEMBLY,HYD
KEY FEATURES
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
•
CRITICALITY CODE JUSTIFICATION: ZZZY
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSCLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D
CRITICALITY CODE JUSTIFICATIONZZZY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
21-19677MKB CPInterchangeable
Same NIIN cross-reference
interchangeable
21-19677B MK B OXYGEN CLEANCPInterchangeable
Same NIIN cross-reference
interchangeable
21-19677MKBInterchangeable
Same NIIN cross-reference
interchangeable
21-19677B MK BCPInterchangeable
Same NIIN cross-reference
interchangeable
21-19677B MK B OXYGEN CLEANInterchangeable
Same NIIN cross-reference
interchangeable
S9515-A1-MMO-030-FIG&IN-7-34-154Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-19677B MK B?
21-19677B MK B is a HEADER ASSEMBLY,HYD.
What parts can replace 21-19677B MK B?
There are 8 known substitutes for 21-19677B MK B: 21-19677MKB CP, 21-19677B MK B OXYGEN CLEANCP, 21-19677MKB and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-19677B MK B?
21-19677B MK B is cataloged in the Federal Logistics Information System (FLIS) under NSN 3655-01-031-8621. 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