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Technical Data Sheet
PartsTable / COMPONENT / 501020-1
501020-1 ✓ 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 COVER,ACCESS is a the manufacturer industrial component. Key specifications include end_item_identification: 4320-01-533-6418;600 GPM PUMP ASSEMBLY,WATER, part_name_assigned_by_controlling_agency: LID. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-740-8771, 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
501020-1
NSN: 5310-00-740-8771
FSC: 5310
CAGE: 62793 — BFM ENERGY PRODUCTS CORP (USA)
SPECIFICATIONS
end_item_identification4320-01-533-6418;600 GPM PUMP ASSEMBLY,WATER
part_name_assigned_by_controlling_agencyLID
NSN5310-00-740-8771
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 501020-1 · 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
•
PILOT DIAMETER: 0.274 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
•
NUT STYLE: CLINCH
•
LUBRICATION: DRY FILM LUBRICANT
•
TEMP RATING: 450.0 FAHRENHEIT MAXIMUM DEGF
•
NOMINAL THREAD SIZE: 0.190 INCHES IN
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
PILOT DIAMETER0.274 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
NUT STYLECLINCH
LUBRICATIONDRY FILM LUBRICANT
TEMP RATING450.0 FAHRENHEIT MAXIMUM DEGF
NOMINAL THREAD SIZE0.190 INCHES IN
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
THREAD SERIESUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
501-02Interchangeable
interchangeable cross-reference
interchangeable
50102-01Interchangeable
interchangeable cross-reference
interchangeable
717890-27Interchangeable
Same NIIN cross-reference
interchangeable
10630033-7Interchangeable
Same NIIN cross-reference
interchangeable
8954809-9Interchangeable
Same NIIN cross-reference
interchangeable
SC5310-0004-10Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 501020-1?
501020-1 is a COVER,ACCESS.
What parts can replace 501020-1?
There are 10 known substitutes for 501020-1: 501-02, 50102-01, 717890-27 and 7 more. Substitute compatibility should be verified for your specific system.
Is 501020-1 still available?
501020-1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026