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366B1 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

366B1: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1040 OR STEEL COMP 1045 OVERALL, thickness: 0.250 INCHES NOMINAL IN, hole_diameter: 1.016 INCHES MINIMUM AND 1.032 INCHES MAXIMUM IN, overall_diameter: 2.000 INCHES NOMINAL IN, surface_treatment: ZINC OR PHOSPHATE OR OIL OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-752-1235, 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
366B1
NSN: 5310-00-752-1235
FSC: 5310 — Nuts and Washers
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1040 OR STEEL COMP 1045 OVERALL
thickness0.250 INCHES NOMINAL IN
hole_diameter1.016 INCHES MINIMUM AND 1.032 INCHES MAXIMUM IN
overall_diameter2.000 INCHES NOMINAL IN
surface_treatmentZINC OR PHOSPHATE OR OIL OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-S-634 FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-Z-325 TY 2 CL 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-P-16232 TY M MIL SPEC 2ND TREATMENT RESPONSE OR MIL-L-3150 MIL SPEC 3RD TREATMENT RESPONSE OVERALL
NSN5310-00-752-1235
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 366B1 · 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 TREATMENT DOCUMENT AND CLASSIFICATION: QQ-Z-325 TY 2 CL 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-P-16232 TY M MIL SPEC 2ND TREATMENT RESPONSE OR MIL-L-3150 MIL SPEC 3RD TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 2.000 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-634 FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: ZINC OR PHOSPHATE OR OIL OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 1040 OR STEEL COMP 1045 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-Z-325 TY 2 CL 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-P-16232 TY M MIL SPEC 2ND TREATMENT RESPONSE OR MIL-L-3150 MIL SPEC 3RD TREATMENT RESPONSE OVERALL
OVERALL DIAMETER2.000 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-634 FED SPEC 1ST MATERIAL RESPONSE AND QQ-S-634 FED SPEC 2ND MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTZINC OR PHOSPHATE OR OIL OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 1040 OR STEEL COMP 1045 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.016 INCHES MINIMUM AND 1.032 INCHES MAXIMUM IN
THICKNESS0.250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 4
913701Reference document
Same NSN cross-reference
Reference document — Secondary reference
5310007521235Reference document
Same NSN cross-reference
Reference document — Informative reference only
8351007Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
1829M585Same 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 366B1?
366B1 is a WASHER,FLAT.
What parts can replace 366B1?
There are 4 known substitutes for 366B1: 913701, 5310007521235, 8351007 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 366B1?
366B1 is cataloged in the U.S. Government catalog under NSN 5310-00-752-1235. 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.