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Technical Data Sheet
PartsTable / COMPONENT / B121B
B121B ✓ 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 SPRING ASSEMBLY,LEAF is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, design_type: MAINSPRING W/AUXILIARY LEAF, bushing_type: PLAIN, elliptic_shape: SEMI, spring_deflection_rate: 1875.000 POUNDS PER INCH NOMINAL LBS, spring_length_under_load: 46.000 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2510-00-737-7946, 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
B121B
NSN: 2510-00-737-7946
FSC: 2510
CAGE: 78165 — SPRING PERCH CO INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
design_typeMAINSPRING W/AUXILIARY LEAF
bushing_typePLAIN
elliptic_shapeSEMI
rebound_clip_quantity4
spring_deflection_rate1875.000 POUNDS PER INCH NOMINAL LBS
spring_length_under_load46.000 INCHES NOMINAL IN
NSN2510-00-737-7946
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SPRING ASSEMBLY,LEAF TITLE COMPONENT PN B121B MFR SPRING ASSEMBLY,LEAF
KEY FEATURES
•
BUSHING TYPE: PLAIN
•
MATERIAL: STEEL OVERALL
•
SPRING LENGTH UNDER LOAD: 46.000 INCHES NOMINAL IN
•
SPRING DEFLECTION RATE: 1875.000 POUNDS PER INCH NOMINAL LBS
•
ELLIPTIC SHAPE: SEMI
•
DESIGN TYPE: MAINSPRING W/AUXILIARY LEAF
•
REBOUND CLIP QUANTITY: 4
TECHNICAL CHARACTERISTICS (FLIS)
BUSHING TYPEPLAIN
MATERIALSTEEL OVERALL
SPRING LENGTH UNDER LOAD46.000 INCHES NOMINAL IN
SPRING DEFLECTION RATE1875.000 POUNDS PER INCH NOMINAL LBS
ELLIPTIC SHAPESEMI
DESIGN TYPEMAINSPRING W/AUXILIARY LEAF
REBOUND CLIP QUANTITY4
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
127968R91Interchangeable
interchangeable cross-reference
interchangeable
39118Interchangeable
interchangeable cross-reference
interchangeable
SM35723Interchangeable
interchangeable cross-reference
interchangeable
W-156Interchangeable
interchangeable cross-reference
interchangeable
B107.100 CAT 8 TY1Interchangeable
interchangeable cross-reference
interchangeable
795505PC32Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B121B?
B121B is a SPRING ASSEMBLY,LEAF.
What parts can replace B121B?
There are 12 known substitutes for B121B: 127968R91, 39118, SM35723 and 9 more. Substitute compatibility should be verified for your specific system.
Is B121B still available?
B121B is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026