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1JYC7 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1JYC7: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL PROPERTY CLASS 18.8 OVERALL, thickness: 2.5 MILLIMETERS MINIMUM AND 3.4 MILLIMETERS MAXIMUM MM, hole_diameter: 8.4 MILLIMETERS NOMINAL MM, hardness_rating: 70.0 ROCKWELL B NOMINAL, overall_diameter: 16.0 MILLIMETERS NOMINAL MM, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-619-7633, 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
1JYC7
NSN: 5310-01-619-7633
FSC: 5310 — Nuts and Washers
CAGE: 25795 — W.W. GRAINGER, INC. DIV GOVERNMENT SALES DIVISION (USA)
SPECIFICATIONS
materialSTEEL PROPERTY CLASS 18.8 OVERALL
thickness2.5 MILLIMETERS MINIMUM AND 3.4 MILLIMETERS MAXIMUM MM
hole_diameter8.4 MILLIMETERS NOMINAL MM
hardness_rating70.0 ROCKWELL B NOMINAL
overall_diameter16.0 MILLIMETERS NOMINAL MM
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationSTRYKER
cross-sectional_shape_styleRECTANGULAR
part_name_assigned_by_controlling_agencyFLAT WASHER
NSN5310-01-619-7633
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1JYC7 · 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
•
OVERALL DIAMETER: 16.0 MILLIMETERS NOMINAL MM
•
HARDNESS RATING: 70.0 ROCKWELL B NOMINAL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL PROPERTY CLASS 18.8 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER16.0 MILLIMETERS NOMINAL MM
HARDNESS RATING70.0 ROCKWELL B NOMINAL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYFLAT WASHER
END ITEM IDENTIFICATIONSTRYKER
MATERIALSTEEL PROPERTY CLASS 18.8 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER8.4 MILLIMETERS NOMINAL MM
THICKNESS2.5 MILLIMETERS MINIMUM AND 3.4 MILLIMETERS MAXIMUM MM
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1JYC7?
1JYC7 is a WASHER,FLAT.
What is the NSN for 1JYC7?
1JYC7 is cataloged in the U.S. Government catalog under NSN 5310-01-619-7633. 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.