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MM118C8A — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MM118C8A: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OR NICKEL ALLOY 502 OVERALL, recess_angle: 80.0 DEGREES MINIMUM AND 100.0 DEGREES MAXIMUM, hole_diameter: 0.501 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN, recess_diameter: 0.614 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN, outside_diameter: 0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN, style_designator: RECESSED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-304-8739, 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
MM118C8A
NSN: 5310-01-304-8739
FSC: 5310 — Nuts and Washers
CAGE: 58009 — MOELLER MANUFACTURING & SUPPLY, LLC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OR NICKEL ALLOY 502 OVERALL
recess_angle80.0 DEGREES MINIMUM AND 100.0 DEGREES MAXIMUM
hole_diameter0.501 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
recess_diameter0.614 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN
outside_diameter0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentALUMINUM ALLOY OVERALL
material_thickness0.071 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
surface_treatment_document_and_classificationNAS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-304-8739
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MM118C8A · 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: NAS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5662 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.071 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.614 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ALUMINUM ALLOY OVERALL
•
MATERIAL: IRON ALLOY 660 OR NICKEL ALLOY 502 OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS 4006 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5596 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5597 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5662 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN
MATERIAL THICKNESS0.071 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
RECESS DIAMETER0.614 INCHES MINIMUM AND 0.624 INCHES MAXIMUM IN
SURFACE TREATMENTALUMINUM ALLOY OVERALL
MATERIALIRON ALLOY 660 OR NICKEL ALLOY 502 OVERALL
HOLE DIAMETER0.501 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
RECESS ANGLE80.0 DEGREES MINIMUM AND 100.0 DEGREES MAXIMUM
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 3
03A257C8ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
NS202860C8ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VN948BF8CReference document
Same NSN cross-reference
Reference document — Secondary reference
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 MM118C8A?
MM118C8A is a WASHER,RECESSED.
What parts can replace MM118C8A?
There are 3 known substitutes for MM118C8A: 03A257C8A, NS202860C8A, VN948BF8C. Substitute compatibility should be verified for your specific system.
What is the NSN for MM118C8A?
MM118C8A is cataloged in the U.S. Government catalog under NSN 5310-01-304-8739. 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.