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645121S137 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

645121S137: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include usage_design: INTERNAL, inside_diameter: 1.375 INCHES NOMINAL IN, outside_diameter: 1.427 INCHES NOMINAL IN, casehardening_indicator: NOT CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-047-2585, 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
645121S137
NSN: 5325-01-047-2585
FSC: 5325 — Fastening Devices
CAGE: 99551 — GOODRICH CORPORATION DBA GOODRICH CORP (USA)
SPECIFICATIONS
usage_designINTERNAL
inside_diameter1.375 INCHES NOMINAL IN
outside_diameter1.427 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
NSN5325-01-047-2585
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 645121S137 · 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
•
USAGE DESIGN: INTERNAL
•
OUTSIDE DIAMETER: 1.427 INCHES NOMINAL IN
•
INSIDE DIAMETER: 1.375 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
USAGE DESIGNINTERNAL
OUTSIDE DIAMETER1.427 INCHES NOMINAL IN
INSIDE DIAMETER1.375 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 645121S137?
645121S137 is a RING,RETAINING.
What is the NSN for 645121S137?
645121S137 is cataloged in the U.S. Government catalog under NSN 5325-01-047-2585. 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.