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Technical Data Sheet
PartsTable / COMPONENT / 851-0020
851-0020 ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 0.512 INCHES MINIMUM AND 0.530 INCHES MAXIMUM IN, outside_diameter: 0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, material_thickness: 0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN, nondefinitive_spec/std_data: A TYPE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-042-4229, 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
851-0020
NSN: 5310-00-042-4229
FSC: 5310
CAGE: 44940 — CUMMINS POWER GENERATION INC. (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.512 INCHES MINIMUM AND 0.530 INCHES MAXIMUM IN
outside_diameter0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
material_thickness0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
nondefinitive_spec/std_dataA TYPE
material_document_and_classificationQQ-B-746 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-042-4229
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 851-0020 · 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: COPPER ALLOY OVERALL
•
MATERIAL THICKNESS: 0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.512 INCHES MINIMUM AND 0.530 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: A TYPE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-746 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
MATERIAL THICKNESS0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
HOLE DIAMETER0.512 INCHES MINIMUM AND 0.530 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATAA TYPE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-746 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORFLAT INTERNAL TEETH
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
2155Interchangeable
interchangeable cross-reference
interchangeable
1617823Interchangeable
interchangeable cross-reference
interchangeable
BUWEPSDWG1617823Interchangeable
interchangeable cross-reference
interchangeable
MS35333-110Interchangeable
interchangeable cross-reference
interchangeable
MILW6986TYPEAInterchangeable
interchangeable cross-reference
interchangeable
FF-W-100CInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 851-0020?
851-0020 is a WASHER,LOCK.
What parts can replace 851-0020?
There are 21 known substitutes for 851-0020: 2155, 1617823, BUWEPSDWG1617823 and 18 more. Substitute compatibility should be verified for your specific system.
Is 851-0020 still available?
851-0020 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