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FAC1421-428 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

NUT,SELF-LOCKING,EXTENDED WASHER. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-272-6423, 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
FAC1421-428
NSN: 5310-00-272-6423
FSC: 5310
CAGE: 23974 — CRESTVIEW AEROSPACE LLC DIV CRESTVIEW AEROSPACE (USA)
SPECIFICATIONS
Part NumberFAC1421-428
NSN5310-00-272-6423
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FAC1421-428 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
5156117Interchangeable
interchangeable cross-reference
interchangeable
70608R91Interchangeable
interchangeable cross-reference
interchangeable
100106R91Interchangeable
interchangeable cross-reference
interchangeable
25203-2Interchangeable
interchangeable cross-reference
interchangeable
34426ITEM1Interchangeable
interchangeable cross-reference
interchangeable
H204Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FAC1421-428?
FAC1421-428 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace FAC1421-428?
There are 17 known substitutes for FAC1421-428: 5156117, 70608R91, 100106R91 and 14 more. Substitute compatibility should be verified for your specific system.
Is FAC1421-428 still available?
FAC1421-428 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026