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21851NPC14 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 400 OVERALL, thickness: 0.188 INCHES NOMINAL IN, hole_diameter: 0.531 INCHES NOMINAL IN, overall_diameter: 0.997 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-448-1556, 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
21851NPC14
NSN: 5310-01-448-1556
FSC: 5310
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY 400 OVERALL
thickness0.188 INCHES NOMINAL IN
hole_diameter0.531 INCHES NOMINAL IN
overall_diameter0.997 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-448-1556
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21851NPC14 · 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 DOCUMENT AND CLASSIFICATION: ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: NICKEL ALLOY 400 OVERALL
•
HOLE DIAMETER: 0.531 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.997 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
THICKNESS: 0.188 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B164 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALNICKEL ALLOY 400 OVERALL
HOLE DIAMETER0.531 INCHES NOMINAL IN
OVERALL DIAMETER0.997 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.188 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
533-030-009-694Interchangeable
interchangeable cross-reference
interchangeable
533-030-009Interchangeable
interchangeable cross-reference
interchangeable
41910Interchangeable
interchangeable cross-reference
interchangeable
68A3571Interchangeable
interchangeable cross-reference
interchangeable
5BCInterchangeable
interchangeable cross-reference
interchangeable
207802Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21851NPC14?
21851NPC14 is a WASHER,FLAT.
What parts can replace 21851NPC14?
There are 13 known substitutes for 21851NPC14: 533-030-009-694, 533-030-009, 41910 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21851NPC14?
21851NPC14 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-448-1556. 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