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Technical Data Sheet
04-21877-1 ✓ 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 WASHER,SPRING TENSION is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 8.2 MILLIMETERS NOMINAL MM, outside_diameter: 18.2 MILLIMETERS NOMINAL MM, special_features: CALCULATED LOAD IS 2680 LBS.WITH WASHER LOADED TO FLAT CONDITION;ACTUAL LOAD MAY VARY UP TO 25% LBS, style_designator: SPRING TENSION, surface_treatment: ZINC OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-624-3085, 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
04-21877-1
NSN: 5310-01-624-3085
FSC: 5310
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter8.2 MILLIMETERS NOMINAL MM
outside_diameter18.2 MILLIMETERS NOMINAL MM
special_featuresCALCULATED LOAD IS 2680 LBS.WITH WASHER LOADED TO FLAT CONDITION;ACTUAL LOAD MAY VARY UP TO 25% LBS
style_designatorSPRING TENSION
surface_treatmentZINC OVERALL
material_thickness1.4 MILLIMETERS NOMINAL MM
end_item_identification6115-01-561-7329
part_name_assigned_by_controlling_agencyWASHER,BELLEVILLE
NSN5310-01-624-3085
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 04-21877-1 · 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
MATERIAL THICKNESS: 1.4 MILLIMETERS NOMINAL MM
HOLE DIAMETER: 8.2 MILLIMETERS NOMINAL MM
OUTSIDE DIAMETER: 18.2 MILLIMETERS NOMINAL MM
MATERIAL: STEEL OVERALL
STYLE DESIGNATOR: SPRING TENSION
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS1.4 MILLIMETERS NOMINAL MM
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER,BELLEVILLE
HOLE DIAMETER8.2 MILLIMETERS NOMINAL MM
SPECIAL FEATURESCALCULATED LOAD IS 2680 LBS.WITH WASHER LOADED TO FLAT CONDITION;ACTUAL LOAD MAY VARY UP TO 25% LBS
END ITEM IDENTIFICATION6115-01-561-7329
OUTSIDE DIAMETER18.2 MILLIMETERS NOMINAL MM
MATERIALSTEEL OVERALL
STYLE DESIGNATORSPRING TENSION
SURFACE TREATMENTZINC OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
65-0821Interchangeable
interchangeable cross-reference
interchangeable
65-821Interchangeable
interchangeable cross-reference
interchangeable
04-21877Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 04-21877-1?
04-21877-1 is a WASHER,SPRING TENSION.
What parts can replace 04-21877-1?
There are 3 known substitutes for 04-21877-1: 65-0821, 65-821, 04-21877. Substitute compatibility should be verified for your specific system.
What is the NSN for 04-21877-1?
04-21877-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-624-3085. This indicates validated use in U.S. government and defense supply chains.
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