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4M307 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4M307: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 6061 OVERALL, thickness: 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN, hole_diameter: 1.250 INCHES NOMINAL IN, overall_diameter: 1.484 INCHES NOMINAL IN, surface_treatment: CHROMATE OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-283-2114, 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
4M307
NSN: 5310-01-283-2114
NIINs: 012832114, 012833920, 012833921, 012839760, 012839766, 014076125, 016037777, 016298517, 017187771, 017198390, 017215747, 017231335, 017231344, 017253731, 017259326
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
thickness0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
hole_diameter1.250 INCHES NOMINAL IN
overall_diameter1.484 INCHES NOMINAL IN
surface_treatmentCHROMATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationF-15EX
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAMS-QQ-A-250/11 OR AMS 4027 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyRESTRICTOR, COOLING AIR
surface_treatment_document_and_classificationMIL-DTL-5541, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-283-2114
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4M307 · 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
SUBSTITUTES & CROSS-REFERENCES 1
4M307-2-30Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 4M307?
4M307 is a WASHER,FLAT.
What parts can replace 4M307?
There is 1 known substitute for 4M307: 4M307-2-30. Substitute compatibility should be verified for your specific system.
What is the NSN for 4M307?
4M307 is cataloged in the U.S. Government catalog under NSN 5310-01-283-2114. 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.