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Technical Data Sheet
PartsTable / COMPONENT / 21181C
21181C ✓ 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,RECESSED is a the manufacturer industrial component. Key specifications include color: YELLOW OVERALL, material: COPPER ALLOY OVERALL, recess_depth: 0.094 INCHES NOMINAL IN, hole_diameter: 0.281 INCHES NOMINAL IN, overall_height: 0.250 INCHES NOMINAL IN, recess_diameter: 0.406 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-143-4201, 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
21181C
NSN: 5310-01-143-4201
FSC: 5310
CAGE: 96046 — CRANE PUMPS & SYSTEMS PFT CORP DIV CRANE PUMPS & SYSTEM PFT CORP. (USA)
SPECIFICATIONS
colorYELLOW OVERALL
materialCOPPER ALLOY OVERALL
recess_depth0.094 INCHES NOMINAL IN
hole_diameter0.281 INCHES NOMINAL IN
overall_height0.250 INCHES NOMINAL IN
recess_diameter0.406 INCHES NOMINAL IN
outside_diameter0.750 INCHES NOMINAL IN
style_designatorRECESSED
NSN5310-01-143-4201
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21181C · 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
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL: COPPER ALLOY OVERALL
•
COLOR: YELLOW OVERALL
•
RECESS DEPTH: 0.094 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.406 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.750 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.281 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORRECESSED
MATERIALCOPPER ALLOY OVERALL
COLORYELLOW OVERALL
RECESS DEPTH0.094 INCHES NOMINAL IN
OVERALL HEIGHT0.250 INCHES NOMINAL IN
RECESS DIAMETER0.406 INCHES NOMINAL IN
OUTSIDE DIAMETER0.750 INCHES NOMINAL IN
HOLE DIAMETER0.281 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
21181Interchangeable
interchangeable cross-reference
interchangeable
0839-0008Interchangeable
interchangeable cross-reference
interchangeable
31D4Interchangeable
interchangeable cross-reference
interchangeable
D203Interchangeable
interchangeable cross-reference
interchangeable
4321181Interchangeable
interchangeable cross-reference
interchangeable
95-0854Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21181C?
21181C is a WASHER,RECESSED.
What parts can replace 21181C?
There are 7 known substitutes for 21181C: 21181, 0839-0008, 31D4 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21181C?
21181C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-143-4201. 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