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186977A1 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

186977A1: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include hole_diameter: 17.0 MILLIMETERS NOMINAL MM, overall_diameter: 70.0 MILLIMETERS NOMINAL MM, special_features: 70MM DIA OD X 16.25MM ID X 4.5 THK MM, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND, end_item_identification: NSN: 2420-01-532-3399. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-548-9443, 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
186977A1
NSN: 5310-01-548-9443
FSC: 5310 — Nuts and Washers
CAGE: 10988 — CNH INDUSTRIAL AMERICA LLC DBA CNH AMERICA (USA)
SPECIFICATIONS
hole_diameter17.0 MILLIMETERS NOMINAL MM
overall_diameter70.0 MILLIMETERS NOMINAL MM
special_features70MM DIA OD X 16.25MM ID X 4.5 THK MM
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationNSN: 2420-01-532-3399
part_name_assigned_by_controlling_agencyWASHER, FLAT
NSN5310-01-548-9443
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 186977A1 · 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: 70.0 MILLIMETERS NOMINAL MM
•
PERIPHERAL SHAPE STYLE: ROUND
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 17.0 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER70.0 MILLIMETERS NOMINAL MM
SPECIAL FEATURES70MM DIA OD X 16.25MM ID X 4.5 THK MM
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER, FLAT
END ITEM IDENTIFICATIONNSN: 2420-01-532-3399
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER17.0 MILLIMETERS NOMINAL 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 186977A1?
186977A1 is a WASHER,FLAT.
What is the NSN for 186977A1?
186977A1 is cataloged in the U.S. Government catalog under NSN 5310-01-548-9443. 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.