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121-1258 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

121-1258: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include ring_style: HOOKED WIRE, usage_design: INTERNAL, outside_diameter: 125.5 MILLIMETERS NOMINAL MM, special_features: 2.77MM THICKNESS; RECTANGULAR SECTION MM. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-554-3143, 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
121-1258
NSN: 5325-01-554-3143
FSC: 5325 — Fastening Devices
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
ring_styleHOOKED WIRE
usage_designINTERNAL
outside_diameter125.5 MILLIMETERS NOMINAL MM
special_features2.77MM THICKNESS; RECTANGULAR SECTION MM
NSN5325-01-554-3143
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121-1258 · 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: 125.5 MILLIMETERS NOMINAL MM
•
RING STYLE: HOOKED WIRE
TECHNICAL CHARACTERISTICS
USAGE DESIGNINTERNAL
OUTSIDE DIAMETER125.5 MILLIMETERS NOMINAL MM
RING STYLEHOOKED WIRE
SPECIAL FEATURES2.77MM THICKNESS; RECTANGULAR SECTION MM
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 121-1258?
121-1258 is a RING,RETAINING.
What is the NSN for 121-1258?
121-1258 is cataloged in the U.S. Government catalog under NSN 5325-01-554-3143. 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.