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217971 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

ARMOR,SUPPLEMENTAL,SMALL ARMS-FR. Key specifications include end_item_identification: OH-58D AHIP (ARMY HELICOPTER IMPROVEMENT PROGRAM), ROTARY WING AIRCRAFT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-021-7971, 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
217971
NSN: 5315-00-021-7971
FSC: 5315
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
end_item_identificationOH-58D AHIP (ARMY HELICOPTER IMPROVEMENT PROGRAM), ROTARY WING AIRCRAFT
NSN5315-00-021-7971
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 217971 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
UNDERLOOP LENGTH: 5.000 INCHES NOMINAL IN
•
DIAMETER: 0.375 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
UNDERLOOP LENGTH5.000 INCHES NOMINAL IN
DIAMETER0.375 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STYLE DESIGNATORSTANDARD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
9193431Interchangeable
interchangeable cross-reference
interchangeable
C105-1Interchangeable
interchangeable cross-reference
interchangeable
VRS25328Interchangeable
interchangeable cross-reference
interchangeable
SO-1009-7117Interchangeable
interchangeable cross-reference
interchangeable
10554732Interchangeable
interchangeable cross-reference
interchangeable
206-070-645-3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 217971?
217971 is a ARMOR,SUPPLEMENTAL,SMALL ARMS-FR.
What parts can replace 217971?
There are 11 known substitutes for 217971: 9193431, C105-1, VRS25328 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 217971?
217971 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-021-7971. 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