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6821639 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

6821639: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340, usage_design: EXTERNAL, surface_treatment: SILVER, material_hardness_rating: 48.0 ROCKWELL C NOMINAL, material_document_and_classification: AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-898-7448, 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
6821639
NSN: 5325-00-898-7448
FSC: 5325 — Fastening Devices
CAGE: 73342 — ALLISON TRANSMISSION INC DBA ALLISON TRANSMISSION, INC (USA)
SPECIFICATIONS
materialSTEEL COMP 4340
usage_designEXTERNAL
surface_treatmentSILVER
material_hardness_rating48.0 ROCKWELL C NOMINAL
material_document_and_classificationAMS 6415 ASSN STD SINGLE MATERIAL RESPONSE
NSN5325-00-898-7448
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 6821639 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL HARDNESS RATING: 48.0 ROCKWELL C NOMINAL
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6415 ASSN STD SINGLE MATERIAL RESPONSE
•
SURFACE TREATMENT: SILVER
•
MATERIAL: STEEL COMP 4340
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING48.0 ROCKWELL C NOMINAL
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6415 ASSN STD SINGLE MATERIAL RESPONSE
SURFACE TREATMENTSILVER
MATERIALSTEEL COMP 4340
SUBSTITUTES & CROSS-REFERENCES 1
6786894Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6821639?
6821639 is a RING,RETAINING.
What parts can replace 6821639?
There is 1 known substitute for 6821639: 6786894. Substitute compatibility should be verified for your specific system.
What is the NSN for 6821639?
6821639 is cataloged in the U.S. Government catalog under NSN 5325-00-898-7448. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.