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1133857 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1133857: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.014 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN, hole_diameter: 0.307 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN, overall_diameter: 0.727 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN, special_features: 1/4 INCH USS YELLOW ZINC PLATED THRU HARDENED WASHER; CORE HARDNESS HRC 38 TO 45 IN, surface_treatment: ZINC OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-549-7750, 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
1133857
NSN: 5310-01-549-7750
FSC: 5310 — Nuts and Washers
CAGE: 0Y3H3 — FASTENAL COMPANY DBA FASTENAL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.014 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
hole_diameter0.307 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
overall_diameter0.727 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN
special_features1/4 INCH USS YELLOW ZINC PLATED THRU HARDENED WASHER; CORE HARDNESS HRC 38 TO 45 IN
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identification2320-01-529-2251, TRUCK, BOMB SERVICE
cross-sectional_shape_styleBLANK RECTANGULAR
part_name_assigned_by_controlling_agencyWASHER FLAT
NSN5310-01-549-7750
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1133857 · 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: 0.727 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: BLANK RECTANGULAR
•
COLOR: YELLOW OVERALL
•
SURFACE TREATMENT: ZINC OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.727 INCHES MINIMUM AND 0.749 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLEBLANK RECTANGULAR
COLORYELLOW OVERALL
SPECIAL FEATURES1/4 INCH USS YELLOW ZINC PLATED THRU HARDENED WASHER; CORE HARDNESS HRC 38 TO 45 IN
SURFACE TREATMENTZINC OVERALL
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER FLAT
END ITEM IDENTIFICATION2320-01-529-2251, TRUCK, BOMB SERVICE
MATERIALSTEEL OVERALL
CENTER HOLE SHAPE STYLEROUND
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 2
MP31376Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
3007364Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 1133857?
1133857 is a WASHER,FLAT.
What parts can replace 1133857?
There are 2 known substitutes for 1133857: MP31376, 3007364. Substitute compatibility should be verified for your specific system.
What is the NSN for 1133857?
1133857 is cataloged in the U.S. Government catalog under NSN 5310-01-549-7750. 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.