PartsTable
Technical Data Sheet
A021A0 ✓ 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,PLAIN,EXTENDED WASHER,ROUND. Key specifications include material: TITANIUM ALLOY UNS R56400 OVERALL, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.340 INCHES NOMINAL IN, special_features: BODY DIA. 0.518 IN.;SURFACE TREAT K-103,CAGEC 76823,B4 PRIMER; LOW OBSERVABLE ITEM IN, thread_direction: RIGHT-HAND.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-208-8716, 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
A021A0
NSN: 5310-00-208-8716
FSC: 5310
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R56400 OVERALL
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.340 INCHES NOMINAL IN
special_featuresBODY DIA. 0.518 IN.;SURFACE TREAT K-103,CAGEC 76823,B4 PRIMER; LOW OBSERVABLE ITEM IN
thread_directionRIGHT-HAND
washer_thickness0.040 INCHES NOMINAL IN
countersink_angle110.0 DEGREES NOMINAL BOSS
surface_treatmentPAINT LUSTERLESS OVERALL EXCEPT THREADS
nominal_thread_size0.4375 INCHES IN
supplementary_featuresUSED AS INSERT,PRESSURE TAP W/PN -001
washer_outside_diameter1.000 INCHES NOMINAL IN
NSN5310-00-208-8716
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A021A0 · 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 CLASS: 3B
THREAD SERIES: UNF
NOMINAL THREAD SIZE: 0.138 INCHES IN
BEARING SURFACE TYPE: FLAT
THREAD QUANTITY PER INCH: 40
NUT STYLE: HEXAGON
SURFACE TREATMENT: ZINC OR CHROMIUM OVERALL
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3B
THREAD SERIESUNF
NOMINAL THREAD SIZE0.138 INCHES IN
BEARING SURFACE TYPEFLAT
THREAD QUANTITY PER INCH40
NUT STYLEHEXAGON
SURFACE TREATMENTZINC OR CHROMIUM OVERALL
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
NUT HEIGHT0.094 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
4130053Interchangeable
interchangeable cross-reference
interchangeable
3-598Interchangeable
interchangeable cross-reference
interchangeable
2943-A30Interchangeable
interchangeable cross-reference
interchangeable
N164PC97Interchangeable
interchangeable cross-reference
interchangeable
N304ALT1PC97Interchangeable
interchangeable cross-reference
interchangeable
4000-8401Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A021A0?
A021A0 is a NUT,PLAIN,EXTENDED WASHER,ROUND.
What parts can replace A021A0?
There are 15 known substitutes for A021A0: 4130053, 3-598, 2943-A30 and 12 more. Substitute compatibility should be verified for your specific system.
Is A021A0 still available?
A021A0 is currently cancelled.
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