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Technical Data Sheet
PartsTable / COMPONENT / B3-21
B3-21 ✓ 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 COUPLING,SHAFT,FLEXIBLE is a the manufacturer industrial component. Key specifications include phase: SINGLE, width: 6.656 INCHES NOMINAL IN, height: 5.562 INCHES NOMINAL IN, length: 5.219 INCHES NOMINAL IN, diameter: 3.000 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3010-00-174-5633, 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
B3-21
NSN: 3010-00-174-5633
FSC: 3010
CAGE: 07964 — CHARLES BOND COMPANY DBA CHRISTIANA MACHINE COMPANY (USA)
SPECIFICATIONS
phaseSINGLE
width6.656 INCHES NOMINAL IN
height5.562 INCHES NOMINAL IN
length5.219 INCHES NOMINAL IN
diameter3.000 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING
body_width0.402 INCHES MAXIMUM IN
drive_typeDIRECT
face_width0.312 INCHES NOMINAL IN
tooth_typeINTEGRAL
body_length0.530 INCHES MAXIMUM IN
design_typeINSERT
NSN3010-00-174-5633
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available COUPLING,SHAFT,FLEXIBLE TITLE COMPONENT PN B3-21 MFR COUPLING,SHAFT,FLEXIBL
KEY FEATURES
•
DESIGN TYPE: INSERT
•
OUTSIDE DIAMETER: 2.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DESIGN TYPEINSERT
OVERALL LENGTH2.375 INCHES NOMINAL IN
OUTSIDE DIAMETER2.125 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
305-12Interchangeable
interchangeable cross-reference
interchangeable
45060Interchangeable
interchangeable cross-reference
interchangeable
58-10071Interchangeable
interchangeable cross-reference
interchangeable
B321Interchangeable
interchangeable cross-reference
interchangeable
K7107441REV2PT1Interchangeable
interchangeable cross-reference
interchangeable
254645Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B3-21?
B3-21 is a COUPLING,SHAFT,FLEXIBLE.
What parts can replace B3-21?
There are 18 known substitutes for B3-21: 305-12, 45060, 58-10071 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B3-21?
B3-21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3010-00-174-5633. 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