PartsTable
Technical Data Sheet
PartsTable / COMPONENT / E-3.121
E-3.121 ✓ 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

The E-3.121 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-208-2855, 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
E-3.121
NSN: 5310-00-208-2855
FSC: 5310
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
Part NumberE-3.121
NSN5310-00-208-2855
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: E-3.121 · 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
KEY FEATURES
•
NUT HEIGHT: 0.422 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 10
•
BEARING SURFACE TYPE: CHAMFERED
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL OVERALL
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.422 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH10
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE0.750 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL OVERALL
THREAD CLASS3B
WIDTH ACROSS FLATS1.125 INCHES NOMINAL IN
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
HE273-0033-0001Interchangeable
interchangeable cross-reference
interchangeable
21443Interchangeable
interchangeable cross-reference
interchangeable
1A21-443Interchangeable
interchangeable cross-reference
interchangeable
805027Interchangeable
interchangeable cross-reference
interchangeable
50539Interchangeable
interchangeable cross-reference
interchangeable
54A50E45Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy E-3.121?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is E-3.121?
E-3.121 is a E-3.121.
What parts can replace E-3.121?
There are 19 known substitutes for E-3.121: HE273-0033-0001, 21443, 1A21-443 and 16 more. Substitute compatibility should be verified for your specific system.
Is E-3.121 still available?
E-3.121 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — E-3.121

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026