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CYRD374-1 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

CYRD374-1: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.1575 INCHES MINIMUM AND 0.1590 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES ALL SURFACES, hardness_rating: 40.0 ROCKWELL C MINIMUM, outside_diameter: 0.415 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN, special_features: MATERIAL: STEEL COMP 303F OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-021-6876, 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
CYRD374-1
NSN: 5310-01-021-6876
FSC: 5310 — Nuts and Washers
CAGE: 05624 — GE AVIATION SYSTEMS LLC DBA GE AVIATION SYSTEMS LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.1575 INCHES MINIMUM AND 0.1590 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES ALL SURFACES
hardness_rating40.0 ROCKWELL C MINIMUM
outside_diameter0.415 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN
special_featuresMATERIAL: STEEL COMP 303F OVERALL
style_designatorRECESSED BOTH SIDES
surface_treatmentPASSIVATE OVERALL
material_thickness0.049 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
top_recess_diameter0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
bottom_recess_diameter0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
material_document_and_classificationAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-021-6876
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: CYRD374-1 · 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
•
SURFACE FINISH: 32.0 MICROINCHES BOTTOM
•
TOP RECESS DIAMETER: 0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: TC 668 05624 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
BOTTOM RECESS DIAMETER: 0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM
•
STYLE DESIGNATOR: RECESSED BOTH SIDES
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES BOTTOM
SURFACE FINISH32.0 MICROINCHES ALL SURFACES
TOP RECESS DIAMETER0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONTC 668 05624 MFR REF SINGLE TREATMENT RESPONSE OVERALL
BOTTOM RECESS DIAMETER0.158 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM
STYLE DESIGNATORRECESSED BOTH SIDES
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.415 INCHES MINIMUM AND 0.425 INCHES MAXIMUM IN
MATERIAL THICKNESS0.049 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is CYRD374-1?
CYRD374-1 is a WASHER,RECESSED.
What is the NSN for CYRD374-1?
CYRD374-1 is cataloged in the U.S. Government catalog under NSN 5310-01-021-6876. 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.