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C66-1 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

C66-1: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_depth: 0.094 INCHES NOMINAL IN, hole_diameter: 0.391 INCHES NOMINAL IN, overall_height: 0.250 INCHES NOMINAL IN, outside_diameter: 0.656 INCHES NOMINAL IN, style_designator: RECESSED. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-187-8647, 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
C66-1
NSN: 5310-00-187-8647
FSC: 5310 — Nuts and Washers
CAGE: 36479 — LIPE CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_depth0.094 INCHES NOMINAL IN
hole_diameter0.391 INCHES NOMINAL IN
overall_height0.250 INCHES NOMINAL IN
outside_diameter0.656 INCHES NOMINAL IN
style_designatorRECESSED
NSN5310-00-187-8647
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C66-1 · 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
•
STYLE DESIGNATOR: RECESSED
•
OUTSIDE DIAMETER: 0.656 INCHES NOMINAL IN
•
RECESS DEPTH: 0.094 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.391 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.250 INCHES NOMINAL IN
STYLE DESIGNATORRECESSED
OUTSIDE DIAMETER0.656 INCHES NOMINAL IN
RECESS DEPTH0.094 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.391 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
43656Reference document
Same NSN cross-reference
Reference document — Secondary reference
2207871Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is C66-1?
C66-1 is a WASHER,RECESSED.
What parts can replace C66-1?
There are 2 known substitutes for C66-1: 43656, 2207871. Substitute compatibility should be verified for your specific system.
What is the NSN for C66-1?
C66-1 is cataloged in the U.S. Government catalog under NSN 5310-00-187-8647. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.