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5643-5 ✓ 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 RING,BACKUP is a the manufacturer industrial component. Key specifications include material: STEEL COMP 17-4PH, end_similarity: NOT IDENTICAL, overall_length: 1.843 INCHES NOMINAL IN, first_end_style: SPLINED (STRAIGHT), second_end_style: SPLINED (INVOLUTE), first_end_diameter: 0.6450 INCHES MINIMUM AND 0.6500 INCHES MAXIMUM 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 5365-00-630-1982, 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
5643-5
NSN: 5365-00-630-1982
FSC: 5365
CAGE: 99167 — HAMILTON SUNDSTRAND CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 17-4PH
step_quantity4
end_similarityNOT IDENTICAL
overall_length1.843 INCHES NOMINAL IN
first_end_styleSPLINED (STRAIGHT)
second_end_styleSPLINED (INVOLUTE)
first_end_diameter0.6450 INCHES MINIMUM AND 0.6500 INCHES MAXIMUM IN
second_end_diameter0.7450 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN
largest_step_diameter0.7450 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN
first_end_spline_length0.812 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN
second_end_spline_length0.781 INCHES NOMINAL IN
first_end_spline_quantity12
NSN5365-00-630-1982
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING,BACKUP TITLE COMPONENT PN 5643-5 MFR RING,BACKUP
KEY FEATURES
•
BODY INSIDE DIAMETER: 0.2770 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 0.3770 INCHES MINIMUM AND 0.3810 INCHES MAXIMUM IN
•
CORNER SHAPE: SQUARE ALL CORNERS
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
•
MATERIAL: PLASTIC OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER0.2770 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN
OVERALL LENGTH0.1450 INCHES MINIMUM AND 0.1500 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.3770 INCHES MINIMUM AND 0.3810 INCHES MAXIMUM IN
CORNER SHAPESQUARE ALL CORNERS
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIALPLASTIC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
5643-5Interchangeable
interchangeable cross-reference
interchangeable
5643Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5643-5?
5643-5 is a RING,BACKUP.
What parts can replace 5643-5?
There are 2 known substitutes for 5643-5: 5643-5, 5643. Substitute compatibility should be verified for your specific system.
What is the NSN for 5643-5?
5643-5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5365-00-630-1982. 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