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MC12578 — WASHER,SPRING TENSION

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MC12578: WASHER,SPRING TENSION.

The WASHER,SPRING TENSION is a the manufacturer industrial component. Key specifications include material: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL, hole_diameter: 0.280 INCHES MINIMUM AND 0.280 INCHES MINIMUM AND 0.320 INCHES MAXIMUM0.320 INCHES MAXIMUM IN, overall_height: 0.025 INCHES MINIMUM AND 0.025 INCHES MINIMUM AND 0.045 INCHES MAXIMUM0.045 INCHES MAXIMUM IN, outside_diameter: 0.330 INCHES MINIMUM AND 0.330 INCHES MINIMUM AND 0.370 INCHES MAXIMUM0.370 INCHES MAXIMUM IN, features_provided: CASEHARDENEDCASEHARDENED, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-081-7859, 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
MC12578
NSN: 5310-01-081-7859
FSC: 5310 — Nuts and Washers
CAGE: 76050 — EATON AEROSPACE LLC DBA STERER ENGINEERING DIV M.C.AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL
hole_diameter0.280 INCHES MINIMUM AND 0.280 INCHES MINIMUM AND 0.320 INCHES MAXIMUM0.320 INCHES MAXIMUM IN
overall_height0.025 INCHES MINIMUM AND 0.025 INCHES MINIMUM AND 0.045 INCHES MAXIMUM0.045 INCHES MAXIMUM IN
outside_diameter0.330 INCHES MINIMUM AND 0.330 INCHES MINIMUM AND 0.370 INCHES MAXIMUM0.370 INCHES MAXIMUM IN
features_providedCASEHARDENEDCASEHARDENED
surface_treatmentPASSIVATE OVERALL
material_thickness0.005 INCHES MINIMUM AND 0.005 INCHES MINIMUM AND 0.007 INCHES MAXIMUM0.007 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECTNAVY SPECIAL PROJECT
NSN5310-01-081-7859
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MC12578 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.330 INCHES MINIMUM AND 0.330 INCHES MINIMUM AND 0.370 INCHES MAXIMUM0.370 INCHES MAXIMUM IN
•
FEATURES PROVIDED: CASEHARDENEDCASEHARDENED
•
MATERIAL THICKNESS: 0.005 INCHES MINIMUM AND 0.005 INCHES MINIMUM AND 0.007 INCHES MAXIMUM0.007 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.025 INCHES MINIMUM AND 0.025 INCHES MINIMUM AND 0.045 INCHES MAXIMUM0.045 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.330 INCHES MINIMUM AND 0.330 INCHES MINIMUM AND 0.370 INCHES MAXIMUM0.370 INCHES MAXIMUM IN
FEATURES PROVIDEDCASEHARDENEDCASEHARDENED
MATERIAL THICKNESS0.005 INCHES MINIMUM AND 0.005 INCHES MINIMUM AND 0.007 INCHES MAXIMUM0.007 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECTNAVY SPECIAL PROJECT
MATERIALSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 316 OVERALL
HOLE DIAMETER0.280 INCHES MINIMUM AND 0.280 INCHES MINIMUM AND 0.320 INCHES MAXIMUM0.320 INCHES MAXIMUM IN
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MC12578?
MC12578 is a WASHER,SPRING TENSION.
What is the NSN for MC12578?
MC12578 is cataloged in the U.S. Government catalog under NSN 5310-01-081-7859. 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.