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4021905 ✓ 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,SELF-LOCKING,CLINCH is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), hardness_rating: 24.0 ROCKWELL C MINIMUM, locking_feature: PREVAILING TORQUE ALL METAL DESIGN, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-124-5289, 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
4021905
NSN: 5310-00-124-5289
FSC: 5310
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
hardness_rating24.0 ROCKWELL C MINIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentSILVER OVERALL
nominal_thread_size0.250 INCHES IN
counterbore_diameter0.265 INCHES MINIMUM AND 0.270 INCHES MAXIMUM NUT IN
nut_counterbore_depth0.105 INCHES MINIMUM AND 0.111 INCHES MAXIMUM NUT IN
end_item_identificationW/S: WNGINE, AIRCRAFT, F100 PW220 (F-15C/D/E); AIRCRAFT, F-16; ENGINE, AIRCRAFT, F100-PW-100 (F-15A/B/C/D) A
thread_quantity_per_inch28
NSN5310-00-124-5289
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4021905 · 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
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESUSED ON PRATTWHITNEY F100 ENGIN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
4021866Interchangeable
interchangeable cross-reference
interchangeable
4818DF048-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4021905?
4021905 is a NUT,SELF-LOCKING,CLINCH.
What parts can replace 4021905?
There are 2 known substitutes for 4021905: 4021866, 4818DF048-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 4021905?
4021905 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-124-5289. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026