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91111A121 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

91111A121: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 4.1 MILLIMETERS MINIMUM AND 4.4 MILLIMETERS MAXIMUM MM, outside_diameter: 7.0 MILLIMETERS MAXIMUM MM, style_designator: SPLIT HELICAL-RIGHT HAND, material_thickness: 1.1 MILLIMETERS MINIMUM MM, end_item_identification: 2420-01-560-2306 TRACTOR, WHEELED, HIGH SPEED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-568-0181, 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
91111A121
NSN: 5310-01-568-0181
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter4.1 MILLIMETERS MINIMUM AND 4.4 MILLIMETERS MAXIMUM MM
outside_diameter7.0 MILLIMETERS MAXIMUM MM
style_designatorSPLIT HELICAL-RIGHT HAND
material_thickness1.1 MILLIMETERS MINIMUM MM
end_item_identification2420-01-560-2306 TRACTOR, WHEELED, HIGH SPEED
NSN5310-01-568-0181
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91111A121 · 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: SPLIT HELICAL-RIGHT HAND
•
OUTSIDE DIAMETER: 7.0 MILLIMETERS MAXIMUM MM
•
MATERIAL THICKNESS: 1.1 MILLIMETERS MINIMUM MM
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
HOLE DIAMETER: 4.1 MILLIMETERS MINIMUM AND 4.4 MILLIMETERS MAXIMUM MM
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
OUTSIDE DIAMETER7.0 MILLIMETERS MAXIMUM MM
MATERIAL THICKNESS1.1 MILLIMETERS MINIMUM MM
END ITEM IDENTIFICATION2420-01-560-2306 TRACTOR, WHEELED, HIGH SPEED
MATERIALSTEEL CORROSION RESISTING OVERALL
HOLE DIAMETER4.1 MILLIMETERS MINIMUM AND 4.4 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
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91111A121?
91111A121 is a WASHER,LOCK.
What is the NSN for 91111A121?
91111A121 is cataloged in the U.S. Government catalog under NSN 5310-01-568-0181. 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.