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90177A221 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

90177A221: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, usage_design: INTERNAL, major_thickness: 0.130 INCHES MAXIMUM IN, material_diameter: 0.084 INCHES NOMINAL IN, surface_treatment: ZINC, casehardening_indicator: CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-328-4742, 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
90177A221
NSN: 5325-01-328-4742
FSC: 5325 — Fastening Devices
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL
usage_designINTERNAL
major_thickness0.130 INCHES MAXIMUM IN
material_diameter0.084 INCHES NOMINAL IN
surface_treatmentZINC
casehardening_indicatorCASEHARDENED
end_item_identificationRADAR SET (TACFIRE) AN/TPQ-37(V)-1
NSN5325-01-328-4742
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 90177A221 · 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
•
MATERIAL DIAMETER: 0.084 INCHES NOMINAL IN
•
MAJOR THICKNESS: 0.130 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: CASEHARDENED
•
SURFACE TREATMENT: ZINC
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
USAGE DESIGNINTERNAL
MATERIAL DIAMETER0.084 INCHES NOMINAL IN
MAJOR THICKNESS0.130 INCHES MAXIMUM IN
CASEHARDENING INDICATORCASEHARDENED
SURFACE TREATMENTZINC
END ITEM IDENTIFICATIONRADAR SET (TACFIRE) AN/TPQ-37(V)-1
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 2
C5080720Reference document
Same NSN cross-reference
Reference document — Secondary reference
136578-9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 90177A221?
90177A221 is a RING,RETAINING.
What parts can replace 90177A221?
There are 2 known substitutes for 90177A221: C5080720, 136578-9. Substitute compatibility should be verified for your specific system.
What is the NSN for 90177A221?
90177A221 is cataloged in the U.S. Government catalog under NSN 5325-01-328-4742. 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.