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HD121A ✓ 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 HEAD ASSEMBLY is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4310-00-167-8749, 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
HD121A
NSN: 4310-00-167-8749
FSC: 4310
CAGE: 93232 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS WRIGHT ENGINEERED PUMP DIVISION USE CAGE CODE 0UBG9 FOR CATALOGING (USA)
SPECIFICATIONS
general_characteristics_item_descriptionSTEEL; 8.250 IN. OD; 2.437 IN. H; 1.625 IN. ID; SIX 0.530 IN. DIA MTG HOLES EQUALLY SPACED ON 7.000 IN. BOLT CIRCLE DIA; FIVE THD HOLES UNEVENLY SPACED ON ONE SIDE ONLY; 5/16-24 UNF-2B RH THD SIZE IN
NSN4310-00-167-8749
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available HEAD ASSEMBLY TITLE COMPONENT PN HD121A MFR HEAD ASSEMBLY
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL; 8.250 IN. OD; 2.437 IN. H; 1.625 IN. ID; SIX 0.530 IN. DIA MTG HOLES EQUALLY SPACED ON 7.000 IN. BOLT CIRCLE DIA; FIVE THD HOLES UNEVENLY SPACED ON ONE SIDE ONLY; 5/16-24 UNF-2B RH THD SIZE IN
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL; 8.250 IN. OD; 2.437 IN. H; 1.625 IN. ID; SIX 0.530 IN. DIA MTG HOLES EQUALLY SPACED ON 7.000 IN. BOLT CIRCLE DIA; FIVE THD HOLES UNEVENLY SPACED ON ONE SIDE ONLY; 5/16-24 UNF-2B RH THD SIZE IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
275SInterchangeable
interchangeable cross-reference
interchangeable
S43Interchangeable
interchangeable cross-reference
interchangeable
1010NInterchangeable
interchangeable cross-reference
interchangeable
695-07506-000Interchangeable
interchangeable cross-reference
interchangeable
695-7506Interchangeable
interchangeable cross-reference
interchangeable
10NInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HD121A?
HD121A is a HEAD ASSEMBLY.
What parts can replace HD121A?
There are 9 known substitutes for HD121A: 275S, S43, 1010N and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for HD121A?
HD121A is cataloged in the Federal Logistics Information System (FLIS) under NSN 4310-00-167-8749. 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