PartsTable
Technical Data Sheet
PartsTable / COMPONENT / AT5370
AT5370 ✓ 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 NUT,PLAIN,CASTELLATED,OCTAGON is a the manufacturer industrial component. Key specifications include nut_style: CASTELLATED, OCTAGON, nut_height: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UN, thread_direction: RIGHT-HAND, width_across_flats: 4.365 INCHES MINIMUM AND 4.385 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-371-4114, 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
AT5370
NSN: 5310-00-371-4114
FSC: 5310
CAGE: 3D6E9 — MERITOR INDUSTRIAL PRODUCTS, LLC (USA)
SPECIFICATIONS
nut_styleCASTELLATED, OCTAGON
nut_height0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
thread_class3B
thread_seriesUN
thread_directionRIGHT-HAND
width_across_flats4.365 INCHES MINIMUM AND 4.385 INCHES MAXIMUM IN
nominal_thread_size3.000 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch12
NSN5310-00-371-4114
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AT5370 · 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
•
THREAD SERIES: UN
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 12
•
NOMINAL THREAD SIZE: 3.000 INCHES IN
•
WIDTH ACROSS FLATS: 4.365 INCHES MINIMUM AND 4.385 INCHES MAXIMUM IN
•
THREAD CLASS: 3B
•
NUT HEIGHT: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUN
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH12
NOMINAL THREAD SIZE3.000 INCHES IN
WIDTH ACROSS FLATS4.365 INCHES MINIMUM AND 4.385 INCHES MAXIMUM IN
THREAD CLASS3B
NUT HEIGHT0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NUT STYLECASTELLATED, OCTAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
20220-4Interchangeable
interchangeable cross-reference
interchangeable
MS20220-4Interchangeable
interchangeable cross-reference
interchangeable
81-1001-28Interchangeable
interchangeable cross-reference
interchangeable
605I5RInterchangeable
Same NIIN cross-reference
interchangeable
6051SRInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy AT5370?
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 AT5370?
AT5370 is a NUT,PLAIN,CASTELLATED,OCTAGON.
What parts can replace AT5370?
There are 5 known substitutes for AT5370: 20220-4, MS20220-4, 81-1001-28 and 2 more. Substitute compatibility should be verified for your specific system.
Is AT5370 still available?
AT5370 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 — AT5370

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