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90990A190 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

90990A190: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: SPIRAL, inside_diameter: 0.438 INCHES NOMINAL IN, outside_diameter: 0.625 INCHES NOMINAL IN, end_item_identification: 5419-01-539-7180. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-644-0416, 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
90990A190
NSN: 5325-01-644-0416
FSC: 5325 — Fastening Devices
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL
ring_styleSPIRAL
inside_diameter0.438 INCHES NOMINAL IN
outside_diameter0.625 INCHES NOMINAL IN
end_item_identification5419-01-539-7180
NSN5325-01-644-0416
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 90990A190 · 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
•
OUTSIDE DIAMETER: 0.625 INCHES NOMINAL IN
•
INSIDE DIAMETER: 0.438 INCHES NOMINAL IN
•
RING STYLE: SPIRAL
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER0.625 INCHES NOMINAL IN
INSIDE DIAMETER0.438 INCHES NOMINAL IN
RING STYLESPIRAL
END ITEM IDENTIFICATION5419-01-539-7180
MATERIALSTEEL
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
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 90990A190?
90990A190 is a RING,RETAINING.
What is the NSN for 90990A190?
90990A190 is cataloged in the U.S. Government catalog under NSN 5325-01-644-0416. 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.