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Technical Data Sheet
PartsTable / COMPONENT / 3-B-21
3-B-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 INSERT,FLEXIBLE COUPLING is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, special_features: LAMINATED CONSTRUCTION FEATURE-NOT INCL.;HUB THK 0.281 IN.;MATL-CHLOROPRENE RUBBER IN, style_designator: SPIDER, overall_thickness: 0.500 INCHES NOMINAL IN, overall_outside_diameter: 2.093 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3010-01-091-2283, 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
3-B-21
NSN: 3010-01-091-2283
FSC: 3010
CAGE: 07964 — CHARLES BOND COMPANY DBA CHRISTIANA MACHINE COMPANY (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
lug_quantity6
special_featuresLAMINATED CONSTRUCTION FEATURE-NOT INCL.;HUB THK 0.281 IN.;MATL-CHLOROPRENE RUBBER IN
style_designatorSPIDER
overall_thickness0.500 INCHES NOMINAL IN
overall_outside_diameter2.093 INCHES NOMINAL IN
NSN3010-01-091-2283
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available INSERT,FLEXIBLE COUPLING TITLE COMPONENT PN 3-B-21 MFR INSERT,FLEXIBLE COUPLI
KEY FEATURES
•
MATERIAL: RUBBER SYNTHETIC
•
OVERALL THICKNESS: 0.500 INCHES NOMINAL IN
•
LUG QUANTITY: 6
•
OVERALL OUTSIDE DIAMETER: 2.093 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SPIDER
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER SYNTHETIC
SPECIAL FEATURESLAMINATED CONSTRUCTION FEATURE-NOT INCL.;HUB THK 0.281 IN.;MATL-CHLOROPRENE RUBBER IN
OVERALL THICKNESS0.500 INCHES NOMINAL IN
LUG QUANTITY6
OVERALL OUTSIDE DIAMETER2.093 INCHES NOMINAL IN
STYLE DESIGNATORSPIDER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
43125Interchangeable
interchangeable cross-reference
interchangeable
MU7-103AInterchangeable
interchangeable cross-reference
interchangeable
0604388Interchangeable
interchangeable cross-reference
interchangeable
B465Interchangeable
interchangeable cross-reference
interchangeable
YAV14L65Interchangeable
interchangeable cross-reference
interchangeable
B456040-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3-B-21?
3-B-21 is a INSERT,FLEXIBLE COUPLING.
What parts can replace 3-B-21?
There are 9 known substitutes for 3-B-21: 43125, MU7-103A, 0604388 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3-B-21?
3-B-21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3010-01-091-2283. 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