PartsTable
Technical Data Sheet
N521 ✓ 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

SOCKET,PLUG-IN ELECTRONIC COMPON. Key specifications include material: PLASTIC BODY, nut_style: HEXAGON, nut_height: 0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF, mounting_method: BODY THROUGH HOLE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-167-1344, 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
N521
NSN: 5310-00-167-1344
FSC: 5310
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
materialPLASTIC BODY
nut_styleHEXAGON
nut_height0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
mounting_methodBODY THROUGH HOLE
thread_directionRIGHT-HAND
polarization_typeCONTACT POSITION
surface_treatmentCADMIUM OVERALL
fabrication_methodMOLDED
width_across_flats0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
mounting_hole_styleROUND, W/TWO MOUNTING HOLES
NSN5310-00-167-1344
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: N521 · 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
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
NOMINAL THREAD SIZE: 0.250 INCHES IN
THREAD QUANTITY PER INCH: 28
BEARING SURFACE FINISH: 125.0 MICROINCHES
THREAD SERIES: UNF
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.250 INCHES IN
END ITEM IDENTIFICATIONARMORED MULTI-PURPOSE VEHICLE (AMPV)
THREAD QUANTITY PER INCH28
BEARING SURFACE FINISH125.0 MICROINCHES
THREAD SERIESUNF
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
4629248 PC 103Interchangeable
interchangeable cross-reference
interchangeable
1800T4Interchangeable
interchangeable cross-reference
interchangeable
1800-1AInterchangeable
interchangeable cross-reference
interchangeable
4900Interchangeable
interchangeable cross-reference
interchangeable
4253252Interchangeable
interchangeable cross-reference
interchangeable
14136AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is N521?
N521 is a SOCKET,PLUG-IN ELECTRONIC COMPON.
What parts can replace N521?
There are 26 known substitutes for N521: 4629248 PC 103, 1800T4, 1800-1A and 23 more. Substitute compatibility should be verified for your specific system.
Is N521 still available?
N521 is currently cancelled.
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