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MM135-6 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MM135-6: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.380 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING OVERALL, hole_diameter: 0.490 INCHES NOMINAL IN, outside_diameter: 0.675 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN, style_designator: CONCAVE, material_thickness: 0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-277-9335, 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
MM135-6
NSN: 5310-00-277-9335
FSC: 5310 — Nuts and Washers
CAGE: 58009 — MOELLER MANUFACTURING & SUPPLY, LLC (USA)
SPECIFICATIONS
radius0.380 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING OVERALL
hole_diameter0.490 INCHES NOMINAL IN
outside_diameter0.675 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN
style_designatorCONCAVE
material_thickness0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
NSN5310-00-277-9335
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MM135-6 · 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
•
RADIUS: 0.380 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CONCAVE
•
OUTSIDE DIAMETER: 0.675 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
HOLE DIAMETER: 0.490 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
RADIUS0.380 INCHES NOMINAL IN
STYLE DESIGNATORCONCAVE
OUTSIDE DIAMETER0.675 INCHES MINIMUM AND 0.685 INCHES MAXIMUM IN
MATERIAL THICKNESS0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING OVERALL
HOLE DIAMETER0.490 INCHES NOMINAL 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 3
10121240Reference document
Same NSN cross-reference
Reference document — Informative reference only
ST3M683-6Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
SW2000-12WReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MM135-6?
MM135-6 is a WASHER,CONCAVE.
What parts can replace MM135-6?
There are 3 known substitutes for MM135-6: 10121240, ST3M683-6, SW2000-12W. Substitute compatibility should be verified for your specific system.
What is the NSN for MM135-6?
MM135-6 is cataloged in the U.S. Government catalog under NSN 5310-00-277-9335. 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.